Updated on 2021/04/01

写真a

 
SAITO, Nagahiro
 
Organization
Institutes of Innovation for Future Society Social InnovationDesign Center (SIDC) Innovative Project Division Professor
Graduate School of Engineering Professor
Graduate School
Graduate School of Engineering
Title
Professor
Contact information
メールアドレス

Degree 1

  1. 博士(工学) ( 2000.3   早稲田大学 ) 

Research Interests 6

  1. Organic devices

  2. Reaction Analysis

  3. Graphene

  4. Catalyst

  5. Solution Plasma

  6. Organic devices

Research Areas 8

  1. Nanotechnology/Materials / Nanomaterials

  2. Nanotechnology/Materials / Fundamental physical chemistry  / Physical Chemistry

  3. Energy Engineering / Applied plasma science

  4. Nanotechnology/Materials / Nanometer-scale chemistry

  5. Nanotechnology/Materials / Nanostructural physics

  6. Nanotechnology/Materials / Thin film/surface and interfacial physical properties  / Functional Materials/Device

  7. Nanotechnology/Materials / Composite materials and interfaces  / Material Processing/Treatment

  8. Nanotechnology/Materials / Metals production and resources production

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Current Research Project and SDGs 6

  1. カーボンデータベースとインフォマティックス

  2. 高性能二次電池の開発

  3. 水素社会のための燃料電池開発

  4. レドックス電池の開発

  5. 超軽量ハイエントロピー合の開発

  6. ソリューションプラズマによる水処理

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Research History 13

  1. Nagoya University   Department of Chemical Systems Engineering, Graduated School of Engineering   Professor

    2017.4

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    Country:Japan

  2. Nagoya University   Department of Chemical Systems Engineering, Graduated School of Engineering   Professor

    2017.4

  3. Institute for Innovation for Future Society   Professor

    2014.4

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    Country:Japan

  4. Nagoya University   Administrative Support Organizations Headquarters for Industry, Academia and Government Cooperation

    2012.10 - 2016.3

  5. Nagoya University

    2012.4 - 2016.3

  6. Nagoya University   EcoTopia Science Institute Nano-Material Science Research Division

    2011.7 - 2017.3

  7. Nagoya University   Graduate School of Engineering Department of Materials,Physics and Energy Engineering Engineering of Structural Materials in Ultimate States

    2011.7 - 2017.3

  8. Nagoya University, Green Mobility Research Center, Professor

    2011.7 - 2016.3

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    Country:Japan

  9. EcoTopia Science Institute/Professor

    2009.4 - 2011.6

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    Country:Japan

  10. 名古屋大学工学研究科物質制御工学専攻・准教授

    2004.3 - 2009.3

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    Country:Japan

  11. 名古屋大学工学研究科リサーチアソシエイト

    2000.10 - 2004.3

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    Country:Japan

  12. 早稲田大学理工学部・助手

    2000.4 - 2000.9

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    Country:Japan

  13. 日本学術振興会・特別研究員

    1997.4 - 2000.3

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    Country:Japan

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Education 4

  1. Waseda University   Graduate School, Division of Science and Engineering

    - 2000.3

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    Country: Japan

  2. Waseda University   Graduate School, Division of Science and Engineering

    - 2000.3

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    Country: Japan

  3. Waseda University   Graduate School, Division of Science and Engineering

    - 1997.3

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    Country: Japan

  4. Waseda University   Faculty of Science and Engineering

    1991.4 - 1995.3

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    Country: Japan

Professional Memberships 7

  1. 表面技術協会   理事(国際担当)

    2004.4

  2. 日本MRS   常任理事

    2008.4 - 2009.3

  3. The Surface Science of Japan

    2006.4

  4. 日本応用物理学会

  5. The Chemical Soceity of Japan

  6. 資源素材学会   評議委員

    2016.4

  7. 日本金属学会

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Committee Memberships 1

  1. 日本学術振興会産学協力研究第183委員会委員会   運営幹事  

    2010.12   

Awards 33

  1. Excellence Award of Poster Presentation

    2011.1   The 12th International Symposium on Eco-materials Processing and Design  

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    Country:Thailand

  2. Excellence Award of Poster Presentation

    2011.1   The 12th International Symposium on Eco-materials Processing and Design  

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    Award type:Award from international society, conference, symposium, etc.  Country:Thailand

  3. Excellence Award of Poster Presentation

    2011.1   The 12th International Symposium on Eco-materials Processing and Design  

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    Award type:International academic award (Japan or overseas)  Country:Thailand

  4. ASIA-PACIFIC INTERFINISH 2010 1st Prize Poster Winner

    2010.10   ASIA-PACIFIC INTERFINISH 2010  

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    Country:Singapore

  5. ASIA-PACIFIC INTERFINISH 2010 1st Prize Poster Winner

    2010.10   ASIA-PACIFIC INTERFINISH 2010  

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    Award type:Award from international society, conference, symposium, etc.  Country:Singapore

  6. 17th Iketani ConferenceThe Doyama Symposium on Advanced Material・Doyama Awards

    2007.9   日本MRS  

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    Country:Japan

  7. 17th Iketani ConferenceThe Doyama Symposium on Advanced Material・Doyama Awards

    2007.9   日本MRS  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  8. The Symposium on Electronic Materials and Processing on occasion of IUMRS-ICA-2006 Best Paper Award

    2006.12   IUMRS-ICA-2006  

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    Country:Japan

  9. 平成18年度表面技術若手研究者・技術者研究交流発表会 若手奨励賞

    2006.12   表面技術協会  

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    Country:Japan

  10. The Symposium on Electronic Materials and Processing on occasion of IUMRS-ICA-2006 Best Paper Award

    2006.12   IUMRS-ICA-2006  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  11. 平成18年度表面技術若手研究者・技術者研究交流発表会 若手奨励賞

    2006.12   表面技術協会  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  12. 日本金属学会2006年秋期大会優秀ポスター賞

    2006.9   日本金属学会  

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    Country:Japan

  13. 日本金属学会2006年秋期大会優秀ポスター賞

    2006.9   日本金属学会  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  14. 表面技術協会第109回講演大会: 第10回表面技術協会学術奨励講演賞

    2006.3   表面技術協会  

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    Country:Japan

  15. 表面技術協会第109回講演大会: 第10回表面技術協会学術奨励講演賞

    2006.3   表面技術協会  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  16. 表面技術協会・中部支部若手講演奨励賞

    2005.12   表面技術協会  

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    Country:Japan

  17. 第16回日本MRS学術シンポジウム奨励賞

    2005.12   日本MRS  

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    Country:Japan

  18. 表面技術協会・中部支部若手講演奨励賞

    2005.12   表面技術協会  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  19. 第16回日本MRS学術シンポジウム奨励賞

    2005.12   日本MRS  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  20. 表面技術協会第107回講演大会: 第9回表面技術協会学術奨励講演賞

    2005.3   表面技術協会  

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    Country:Japan

  21. 表面技術協会第107回講演大会: 第9回表面技術協会学術奨励講演賞

    2005.3   表面技術協会  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  22. 第15回日本MRS学術シンポジウム: 第15回日本MRS学術シンポジウム奨励賞

    2004.12   日本MRS  

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    Country:Japan

  23. 第15回日本MRS学術シンポジウム: 第15回日本MRS学術シンポジウム奨励賞

    2004.12   日本MRS  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  24. 日本金属学会2004年秋季(第135回)大会: 第3回日本金属学会優秀ポスター賞

    2004.9   日本金属学会  

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    Country:Japan

  25. 日本金属学会2004年秋季(第135回)大会: 第3回日本金属学会優秀ポスター賞

    2004.9   日本金属学会  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  26. 平成16年度表面技術若手研究者・技術者研究交流発表会: 若手奨励賞

    2003.12   表面技術協会  

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    Country:Japan

  27. 平成16年度表面技術若手研究者・技術者研究交流発表会: 若手奨励賞

    2003.12   表面技術協会  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  28. 表面技術協会第107回講演大会: 第9回学術奨励講演賞

    2003.3   表面技術協会  

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    Country:Japan

  29. 表面技術協会第107回講演大会: 第9回学術奨励講演賞

    2003.3   表面技術協会  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  30. 表面技術協会第105回講演大会:第8回学術奨励講演賞

    2002.3   表面技術協会  

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    Country:Japan

  31. 表面技術協会第105回講演大会:第8回学術奨励講演賞

    2002.3   表面技術協会  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  32. 日本MRS第13回学術講演奨励賞

    2001.12   日本MRS  

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    Country:Japan

  33. 日本MRS第13回学術講演奨励賞

    2001.12   日本MRS  

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

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Papers 863

  1. P-Type Doping of Graphene with Cationic Nitrogen

    Chae S.

    ACS Applied Nano Materials   Vol. 2 ( 3 ) page: 1350 - 1355   2019.3

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    Authorship:Last author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:ACS Applied Nano Materials  

    DOI: 10.1021/acsanm.8b02237

    Scopus

  2. One-pot synthesis of purple benzene-derived MnO2-carbon hybrids and synergistic enhancement for the removal of cationic dyes

    Hyemin Kim, Nagahiro Saito

    Scientific Reports   Vol. 8 ( 1 )   2018.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Nature Publishing Group  

    MnO2-carbon hybrid (MnO2-C-PBz) was simultaneously synthesized by a one-step solution plasma process (SPP) using a single precursor referred to as "purple benzene", which was derived from the K+(dicyclohexano-18-crown-6 ether) complex. To clarify the synergistic effects on the cationic dye removal, MnO2-free carbon and carbon-free MnO2 samples were concurrently investigated. The results of adsorption for cationic dyes (methylene blue (MB) and rhodamine B (Rh B)) and anionic dye (methyl orange (MO)) revealed remarkably high affinity for cationic dyes. In particular, MnO2-C-PBz exhibited the highest adsorption capacity for MB, i.e., ∼3 times greater than that of the others. In addition, MnO2-C-PBz exhibited a rapid, high decolorization ability at C0 = 10 mg L-1 (within a few seconds, ∼99%) and at C0 = 100 mg L-1 (within 30 min, ∼81%), and the theoretical maximum monolayer adsorption capacity was 357.14 mg g-1 as calculated from the Langmuir adsorption isotherm equation. Furthermore, compared with carbon-free MnO2, MnO2-C-PBz exhibited quite a good cyclic stability. We expect that our findings give rise to the understanding of the synergistic effects of MnO2-carbon hybrid, as well as role of each components for the cationic dye adsorption, and may open an innovative synthesis approach to inorganic-organic hybrid materials.

    DOI: 10.1038/s41598-018-22203-1

    Web of Science

    Scopus

  3. N-Doped few-layer graphene encapsulated Pt-based bimetallic nanoparticles via solution plasma as an efficient oxygen catalyst for the oxygen reduction reaction

    Phu Quoc Phan, Naraprawatphong Rinyarat, Pornaroontham Phuwadej, Park Junmu, Chokradjaroen Chayanaphat, Saito Nagahiro

    MATERIALS ADVANCES   Vol. 2 ( 1 ) page: 322 - 335   2021.1

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/d0ma00718h

    Web of Science

  4. Safe, superionic conductive and flexible “polymer-in-plastic salts” electrolytes for dendrite-free lithium metal batteries Reviewed International coauthorship

    Liao Z.

    Energy Storage Materials   Vol. 33   page: 442 - 451   2020.12

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    Publishing type:Research paper (scientific journal)   Publisher:Energy Storage Materials  

    DOI: 10.1016/j.ensm.2020.09.003

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  5. Single-walled carbon nanotubes wrapped by cationic nitrogen-doped carbon for electrocatalytic applications

    Chae S.

    ACS Applied Nano Materials   Vol. 3 ( 10 ) page: 10183 - 10189   2020.10

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    Authorship:Last author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:ACS Applied Nano Materials  

    DOI: 10.1021/acsanm.0c02164

    Scopus

  6. In situ synthesis of copper nanoparticles encapsulated by nitrogen-doped graphene at room temperature via solution plasma International journal

    Phan P.Q.

    RSC Advances   Vol. 10 ( 60 ) page: 36627 - 36635   2020.10

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    Authorship:Last author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:RSC Advances  

    DOI: 10.1039/d0ra07162e

    Scopus

  7. Effect of electrical discharge plasma on cytotoxicity against cancer cells of N,O-carboxymethyl chitosan-stabilized gold nanoparticles International coauthorship

    Chokradjaroen C.

    Carbohydrate Polymers   Vol. 237   2020.6

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:Carbohydrate Polymers  

    DOI: 10.1016/j.carbpol.2020.116162

    Scopus

  8. A Needle-type complementary metal oxide semiconductor-compatible glucose fuel cell fabricated by carbon nanohorns for biomedical applications

    Md. Zahidul Islam, Naofumi Matsuyama, Guowei Chen, Atsuki Kobayashi, Yuichi Momoi and Kiichi Niitsu

    Electrochemistry   Vol. 88 ( 4 ) page: 333 - 335   2020.6

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    Language:English   Publishing type:Research paper (scientific journal)  

  9. Fabrication of biocomposite membrane with microcrystalline cellulose (MCC) extracted from sugarcane bagasse by phase inversion method International coauthorship

    Thiangtham S.

    Cellulose   Vol. 27 ( 3 ) page: 1367 - 1384   2020.2

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:Cellulose  

    DOI: 10.1007/s10570-019-02866-3

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  10. Liquid-Phase Plasma-Assisted in Situ Synthesis of Amino-Rich Nanocarbon for Transition Metal Ion Adsorption International coauthorship

    Tipplook M.

    ACS Applied Nano Materials   Vol. 3 ( 1 ) page: 218 - 228   2020.1

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    Authorship:Last author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:ACS Applied Nano Materials  

    DOI: 10.1021/acsanm.9b01915

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  11. Simultaneous deacetylation and degradation of chitin hydrogel by electrical discharge plasma using low sodium hydroxide concentrations International coauthorship

    Rujiravanit R.

    Carbohydrate Polymers   Vol. 228   2020.1

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:Carbohydrate Polymers  

    DOI: 10.1016/j.carbpol.2019.115377

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  12. Synthesis of Au Nanoparticles in Natural Matrices by Liquid-Phase Plasma: Effects on Cytotoxic Activity against Normal and Cancer Cell Lines

    Treesukkasem N.

    ACS Applied Nano Materials   Vol. 2 ( 12 ) page: 8051 - 8062   2019.12

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    Publishing type:Research paper (scientific journal)   Publisher:ACS Applied Nano Materials  

    DOI: 10.1021/acsanm.9b02106

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  13. Nitriding an oxygen-doped nanocarbonaceous sorbent synthesized via solution plasma process for improving CO<inf>2</inf> adsorption capacity Reviewed

    Pornaroontham P.

    Nanomaterials   Vol. 9 ( 12 )   2019.12

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:Nanomaterials  

    DOI: 10.3390/nano9121776

    Scopus

  14. Quantitative spectrochemical analysis of solution plasma in aromatic molecules

    Bratescu Maria Antoaneta, Kim Kyusung, Saito Nagahiro

    PLASMA PROCESSES AND POLYMERS   Vol. 16 ( 7 )   2019.7

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    Authorship:Last author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Plasma Processes and Polymers  

    DOI: 10.1002/ppap.201900012

    Web of Science

    Scopus

  15. Solution plasma reactions and materials synthesis

    Panomsuwan G.

    Molecular Technology: Materials Innovation     page: 137 - 172   2019.2

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    Publishing type:Research paper (scientific journal)   Publisher:Molecular Technology: Materials Innovation  

    DOI: 10.1002/9783527823987.vol3_c7

    Scopus

  16. Production of reducing sugar from cassava starch waste (CSW) using solution plasma process (SPP)

    Prasertsung I.

    Carbohydrate Polymers   Vol. 205   page: 472 - 479   2019.2

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    Publishing type:Research paper (scientific journal)   Publisher:Carbohydrate Polymers  

    DOI: 10.1016/j.carbpol.2018.10.090

    Scopus

  17. Enhanced degradation of methylene blue by a solution plasma process catalyzed by incidentally co-generated copper nanoparticles

    Prasertsung I.

    Water Science and Technology   Vol. 79 ( 5 ) page: 967 - 974   2019

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    Publishing type:Research paper (scientific journal)   Publisher:Water Science and Technology  

    DOI: 10.2166/wst.2019.035

    Scopus

  18. Maximization of sodium storage capacity of pure carbon material used in sodium-ion batteries International coauthorship

    Kang J.

    Journal of Materials Chemistry A   Vol. 7 ( 27 ) page: 16149 - 16160   2019

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    Publishing type:Research paper (scientific journal)   Publisher:Journal of Materials Chemistry A  

    DOI: 10.1039/c9ta01751h

    Scopus

  19. Solution Plasma-Assisted Green Synthesis of MnO2 Adsorbent and Removal of Cationic Pollutant

    Kim Hye-min, Saito Nagahiro, Kim Dae-wook

    JOURNAL OF CHEMISTRY   Vol. 2019   2019

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    Publishing type:Research paper (scientific journal)   Publisher:Journal of Chemistry  

    DOI: 10.1155/2019/7494292

    Web of Science

    Scopus

  20. Enhanced degradation of methylene blue by a solution plasma process catalyzed by incidentally co-generated copper nanoparticles

    Prasertsung I.

    Water Science and Technology   Vol. 79 ( 5 ) page: 967 - 974   2019

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    Publishing type:Research paper (scientific journal)   Publisher:Water Science and Technology  

    DOI: 10.2166/wst.2019.035

    Scopus

  21. Maximization of sodium storage capacity of pure carbon material used in sodium-ion batteries

    Kang J.

    Journal of Materials Chemistry A   Vol. 7 ( 27 ) page: 16149 - 16160   2019

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    Publishing type:Research paper (scientific journal)   Publisher:Journal of Materials Chemistry A  

    DOI: 10.1039/c9ta01751h

    Scopus

  22. Cytotoxicity against cancer cells of chitosan oligosaccharides prepared from chitosan powder degraded by electrical discharge plasma

    Chokradjaroen C.

    Carbohydrate Polymers   Vol. 201   page: 20 - 30   2018.12

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    Publishing type:Research paper (scientific journal)   Publisher:Carbohydrate Polymers  

    DOI: 10.1016/j.carbpol.2018.08.037

    Scopus

  23. Mechanistic aspect based on the role of reactive oxidizing species (ROS) in macroscopic level on the glycerol photooxidation over defected and defected-free TiO<inf>2</inf>

    Jedsukontorn T.

    Journal of Photochemistry and Photobiology A: Chemistry   Vol. 367   page: 270 - 281   2018.12

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    Publishing type:Research paper (scientific journal)   Publisher:Journal of Photochemistry and Photobiology A: Chemistry  

    DOI: 10.1016/j.jphotochem.2018.08.030

    Scopus

  24. Mechanistic aspect based on the role of reactive oxidizing species (ROS) in macroscopic level on the glycerol photooxidation over defected and defected-free TiO<inf>2</inf>

    Jedsukontorn T.

    Journal of Photochemistry and Photobiology A: Chemistry   Vol. 367   page: 270 - 281   2018.12

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    Publishing type:Research paper (scientific journal)   Publisher:Journal of Photochemistry and Photobiology A: Chemistry  

    DOI: 10.1016/j.jphotochem.2018.08.030

    Scopus

  25. Narrowing band gap energy of defective black TiO2 fabricated by solution plasma process and its photocatalytic activity on glycerol transformation

    Trin Jedsukontorn, Tomonaga Ueno, Nagahiro Saito, Mali Hunsom

    Journal of Alloys and Compounds   Vol. 757   page: 188 - 199   2018.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier Ltd  

    Defective black titania (TiO2) was synthesized by the solution plasma technique at ambient temperature and pressure. The effects of the electrolyte solution medium type (KCl and HNO3) and concentration (0.3 and 3.0 mM) as well as the plasma discharge time (1–4 h) with a Ti electrode were investigated. The 3.0 mM HNO3 solution provided the highest energy per second discharging into the plasma, resulting in both a high synthesis rate of black TiO2 and a high degree of defective structures, as monitored in terms of the Ti3+/Ti4+ ratio, which can shorten the band gap energy (Eg) of the obtained black TiO2. A long plasma discharge time (4 h) induced the formation of large particles of black TiO2, which appeared as a highly defective structure. Overall, the black TiO2 prepared by discharged plasma for 4 h in 3.0 mM HNO3 solution (BTN-304) provided the highest photocatalytic activity for glycerol conversion (58.49% at 24 h) and 4.85, 3.32, 2.11, 2.15, 39.15 and 26.61% yield of glyceraldehyde, dihydroxyacetone, hydroxypyruvic acid, glycolic acid, glycolaldehyde and formaldehyde, respectively. Pathway of glycerol conversion and product distribution over black TiO2 was attempted to propose. Finally, the reusability of the best black TiO2 was explored.

    DOI: 10.1016/j.jallcom.2018.05.046

    Web of Science

    Scopus

  26. Thickness-Dependent Strain Evolution of Epitaxial SrTiO3 Thin Films Grown by Ion Beam Sputter Deposition

    Panomsuwan Gasidit, Saito Nagahiro

    CRYSTAL RESEARCH AND TECHNOLOGY   Vol. 53 ( 8 )   2018.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/crat.201700211

    Web of Science

    Scopus

  27. Enhancing Bifunctional Catalytic Activity of Oxygen Reduction and Evolution Reaction via One-Pot Formation of MnO2-Carbon Hybrid Nanocomposite

    Hye-min Kim, Nagahiro Saito, Dae-wook Kim

    ChemistrySelect   Vol. 3 ( 23 ) page: 6302 - 6308   2018.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley-Blackwell  

    While manganese dioxide (MnO2) is a promising bifunctional electrocatalyst for oxygen reduction and evolution reaction (ORR/OER) in alkaline media, electrochemical performance of bulk MnO2 limited by their poor electrical conductivity. Herein, we fabricate a MnO2-carbon nanoparticle hybrid composite (MO-CNP) by applying the plasma discharge in the single precursor of purple benzene. This synthesis route facilitates a simultaneous formation of MnO2 and carbon, which induced a homogeneously mixed and firmly anchored hybrid composite. As a result, as-obtained MO-CNP-1 shows more than 12 times higher electrical conductivity than that of prepared conventionally. Thus, formation of MO-CNP could be accompanied by a synergy between MnO2 and CNP as electrocatalyst, and consequently, electrochemical properties were significantly improved. In comparison with CNP, the ORR potential of MO-CNP-1 was positively shifted from –0.28 to –0.23 V (vs. Ag/AgCl), and current density has increased more than 2 times. Although the ORR activity of MO-CNP-1 was still far a little short of the commercial Pt/C, the MO-CNP-1 indicated significant higher OER activity, which demonstrated excellent overall catalytic capability of MO-CNP-1 as bifunctional catalyst.

    DOI: 10.1002/slct.201800851

    Web of Science

    Scopus

  28. Nano-Assembled Thin Films of Tetraphenylporphyrin on Amine Silane-Modified Substrate for the Optical Gas Sensor

    Tipplook Mongkol, Hashimi Kazuo, Bratescu Maria Antoaneta, Saito Nagahiro

    NANOSCIENCE AND NANOTECHNOLOGY LETTERS   Vol. 10 ( 5-6 ) page: 667-674   2018.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1166/nnl.2018.2719

    Web of Science

  29. The Nano-Structure and Their Properties of Exfoliation Several Layers-Stacked Graphene Prepared from Graphite Dispersed in Aqueous Solutions by Solution Plasma

    Chae Sangwoo, Hashimi Kazuo, Bratescu Maria Antoaneta, Saito Nagahiro

    NANOSCIENCE AND NANOTECHNOLOGY LETTERS   Vol. 10 ( 5-6 ) page: 784-789   2018.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1166/nnl.2018.2716

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  30. The Initial Reactions from Pyridine to Hetero-Carbon Nanomaterials Through Solution Plasma

    Kim Kyusung, Hashimi Kazuo, Bratescu Maria Antoaneta, Saito Nagahiro

    NANOSCIENCE AND NANOTECHNOLOGY LETTERS   Vol. 10 ( 5-6 ) page: 814-819   2018.5

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    DOI: 10.1166/nnl.2018.2655

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  31. Photoinduced glycerol oxidation over plasmonic au and aum (M = Pt, Pd and Bi) nanoparticle-decorated TiO2 photocatalysts

    Trin Jedsukontorn, Nagahiro Saito, Mali Hunsom

    Nanomaterials   Vol. 8 ( 4 )   2018.4

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    In this study, sol-immobilization was used to prepare gold nanoparticle (Au NP)-decorated titanium dioxide (TiO2) photocatalysts at different Au weight % (wt. %) loading (Aux/TiO2, where x is the Au wt. %) and Au–M NP-decorated TiO2 photocatalysts (Au3M3/TiO2), where M is bismuth (Bi), platinum (Pt) or palladium (Pd) at 3 wt. %. The Aux/TiO2 photocatalysts exhibited a stronger visible light absorption than the parent TiO2 due to the localized surface plasmon resonance effect. Increasing the Au content from 1 wt. % to 7 wt. % led to increased visible light absorption due to the increasing presence of defective structures that were capable of enhancing the photocatalytic activity of the as-prepared catalyst. The addition of Pt and Pd coupled with the Au3/TiO2 to form Au3M3/TiO2 improved the photocatalytic activity of the Au3/TiO2 photocatalyst by maximizing their light-absorption property. The Au3/TiO2, Au3Pt3/TiO2 and Au3Pd3/TiO2 photocatalysts promoted the formation of glyceraldehyde from glycerol as the principle product, while Au3Bi3/TiO2 facilitated glycolaldehyde formation as the major product. Among all the prepared photocatalysts, Au3Pd3/TiO2 exhibited the highest photocatalytic activity with a 98.75% glycerol conversion at 24 h of reaction time.

    DOI: 10.3390/nano8040269

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  32. In vitro cytotoxicity of carbon black nanoparticles synthesized from solution plasma on human lung fibroblast cells

    Gasidit Panomsuwan, Chayanaphat Chokradjaroen, Ratana Rujiravanit, Tomonaga Ueno, Nagahiro Saito

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 57 ( 1 )   2018.1

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    Carbon black nanoparticles (CB-NPs) have been synthesized from liquid benzene by a solution plasma method at room temperature and atmospheric pressure. The morphological observation by scanning electron microscopy revealed the agglomeration of aggregated fine particles. The synthesized CB-NPs were predominantly amorphous as confirmed by X-ray diffraction. The in vitro cytotoxicity of CB-NPs on the human lung fibroblast (MRC-5) cell line was assessed by the 3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and systematically compared with those of two types of commercial carbon blacks (i.e., Vulcan XC-72 and Ketjenblack EC-600JD). Cell viabilities were studied at different concentrations of 32.5, 65, 125, and 250 mu g/mL. It was found that the CB-NPs derived from solution plasma exhibited a lower cytotoxicity on the MRC-5 cells than the other two comparative carbon blacks. The viability of MRC-5 cells exposed to CB-NPs remained higher than 90% even at a high concentration of 250 mu g/mL. This result preliminarily confirmed the biosafety and potential use of CB-NPs in the field of biological applications. (c) 2018 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.57.0102BG

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  33. Degradation of chitosan hydrogel dispersed in dilute carboxylic acids by solution plasma and evaluation of anticancer activity of degraded products

    Chayanaphat Chokradjaroen, Ratana Rujiravanit, Sewan Theeramunkong, Nagahiro Saito

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 57 ( 1 )   2018.1

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    Chitosan is a polysaccharide that has been extensively studied in the field of biomedicine, especially its water-soluble degraded products called chitooligosaccharides (COS). In this study, COS were produced by the degradation of chitosan hydrogel dispersed in a dilute solution (i.e., 1.55mM) of various kinds of carboxylic acids using a non-thermal plasma technology called solution plasma (SP). The degradation rates of chitosan were influenced by the type of carboxylic acids, depending on the interaction between chitosan and each carboxylic acid. After SP treatment, the water-soluble degraded products containing COS could be easily separated from the water-insoluble residue of chitosan hydrogel by centrifugation. The production yields of the COS were mostly higher than 55%. Furthermore, the obtained COS products were evaluated for their inhibitory effect as well as their selectivity against human lung cancer cells (H460) and human lung normal cells (MRC-5). (C) 2018 The Japan Society of Applied Physics

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  34. Plasma in Solution and Its Applications FOREWORD

    Nagahiro Saito, Jun Nakamura, Tatsuru Shirafuji, Takahiro Ishizaki

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 57 ( 1 )   2018.1

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    DOI: 10.7567/JJAP.57.010201

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  35. Synthesis of silicon-carbon black composite as anode material for lithium ion battery

    Hanvin Kim, Yongsub Yun, Young-Chan Lee, Myeong-Hoon Lee, Nagahiro Saito, Jun Kang

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 57 ( 1 )   2018.1

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    Silicon has been attracting attention as an anode material that can be used for the design of high-capacity lithium ion batteries (LIB). However, the long-term cycling performance of silicon is limited owing to exfoliation from the current collector, resulting from volumetric expansion upon alloying with lithium in the charging process. However, carbon black is an agglomerate of primary particles that form a network and can incorporate a sufficient void space between network structures to accommodate the volumetric expansion of silicon. In this study, we propose the possibility of preventing the volume expansion and exfoliation of silicon by capturing silicon nanoparticles in the void space of the carbon black network. A silicon-carbon black composite material with this structure was successfully synthesized by solution plasma processing. (C) 2018 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.57.0102B2

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  36. Solution plasma: A new reaction field for nanomaterials synthesis

    Nagahiro Saito, Maria Antoaneta Bratescu, Kazuo Hashimi

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 57 ( 1 )   2018.1

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    Solution plasma is a new electrical discharge process where an atmospheric non-equilibrium plasma is generated, usually at room temperature, in a liquid environment, such as an aqueous solution or an organic compound. There are a large variety of combinations used in experiments among solutions, electrode materials, plasma configurations, volumes, and reactor geometries, as well as the characteristics of the power supply. The solution plasma process (SPP) combines gas discharge physics, fluid thermodynamic properties, and fluid interfaces reactions. In SPP, nanoparticles with various sizes, shapes, crystallinities, and compositions could be obtained. The synthesis of carbon and hetero-carbon nanomaterials proves that SPP is an efficient and rapid method for their production. The polymerization of benzene in SPP can form graphene. By simply changing the organic precursor, carbon-doped nanostructures can be synthesized with a controlled composition. This review demonstrates that SPP is a new reaction field for nanomaterial production. (C) 2018 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.57.0102A4

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  37. Solution plasma applications for the synthesis/modification of inorganic nanostructured materials and the treatment of natural polymers

    Anyarat Watthanaphanit, Nagahiro Saito

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 57 ( 1 )   2018.1

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    Reducing the use of toxic chemicals, production steps, and time consumption are important concerns for researchers and process engineers to contribute in the quest for an efficient process in any production. If an equipment setup is simple, the process additionally becomes more profitable. Combination of the mentioned requirements has opened up various applications of the solution plasma process (SPP)-a physical means of generating plasma through an electrical discharge in a liquid medium at atmospheric pressure and room temperature. This review shows the progress of scientific research on the applications of the SPP for the synthesis/modification of inorganic nanostructured materials and the treatment of natural polymers. Development achieved in each application is demonstrated. (C) 2018 The Japan Society of Applied Physics

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  38. Enhancement of nitrogen self- doped nanocarbons electrocatalyst via tune- up solution plasma synthesis

    Lee SeungHyo, Saito Nagahiro

    RSC ADVANCES   Vol. 8 ( 62 ) page: 35503 - 35511   2018

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    DOI: 10.1039/c8ra06614k

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  39. Deepening of the Precise Reaction Field in Solution Plasma and Development of Advanced Carbon Catalyst

    Saito Nagahiro

    Meeting Abstracts of the Physical Society of Japan   Vol. 73 ( 0 ) page: 1800 - 1801   2018

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    DOI: 10.11316/jpsgaiyo.73.1.0_1800

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  40. Enhancement of nitrogen self- doped nanocarbons electrocatalyst via tune- up solution plasma synthesis

    Lee SeungHyo, Saito Nagahiro

    RSC ADVANCES   Vol. 8 ( 62 ) page: 35503 - 35511   2018

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    DOI: 10.1039/c8ra06614k

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  41. Facile preparation of defective black TiO2 through the solution plasma process: Effect of parametric changes for plasma discharge on its structural and optical properties

    Trin Jedsukontorn, Tomonaga Ueno, Nagahiro Saito, Mali Hunsom

    JOURNAL OF ALLOYS AND COMPOUNDS   Vol. 726   page: 567 - 577   2017.12

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    Defective TiO2 or black TiO2 nanoparticles (NPs) are remarkably attractive for photocatalytic applications, since the defect-disordered structure crucially affects the optical properties. In this work, high visible light-active black TiO2 NPs were synthesized by an innovative solution plasma process (SPP) with a titanium (Ti) electrode in HNO3 solution. The effects of the plasma operating parameters, in terms of the pulse frequency (20-80 kHz) and pulse width (0.5-2.0 mu s) under two different HNO3 concentrations (0.3 mM and 3.0 mM) on the morphology, structural and optical properties of the obtained black TiO2 NPs were explored. Increasing the pulse frequency, pulse width and concentration of HNO3 all increased the input energy per pulse and energy per second, which induced an increased volume-based particle size, synthesis rate and Ti3+/Ti4+ ratio, but decreased the rutile mass fraction, the Ti-OH/TiO ratio and the band gap energy of the obtained black TiO2 NPs. Among all the prepared black TiO2 NP samples, those prepared at a pulse frequency of 20 kHz, pulse width of 2 mu s (energy input per second of 17.3 J) in 3.0 mM HNO3 exhibited the highest visible-light absorption capability (the lowest band gap energy of -2.44 eV). The variation in the band gap energy was more strongly dependent on the Ti3+/Ti4+ ratio than the Ti-OH/ TiO ratio in the structure of black TiO2 NPs. (C) 2017 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2017.08.028

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  42. Solution Plasma Process-Derived Defect-Induced Heterophase Anatase/Brookite TiO2 Nanocrystals for Enhanced Gaseous Photocatalytic Performance

    Sudhagar Pitchaimuthu, Kaede Honda, Shoki Suzuki, Akane Naito, Norihiro Suzuki, Ken-Ichi Katsumata, Kazuya Nakata, Naoya Ishida, Naoto Kitamura, Yasushi Idemoto, Takeshi Kondo, Makoto Yuasa, Osamu Takai, Tomonaga Ueno, Nagahiro Saito, Akira Fujishima, Chiaki Terashima

    ACS Omega   Vol. 3 ( 1 ) page: 898 - 905   2017.11

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    We report a simple room-temperature synthesis route for increasing the reactivity of a TiO2 photocatalyst using a solution plasma process (SPP). Hydrogen radicals generated from the SPP chamber interact with the TiO2 photocatalyst feedstock, transforming its crystalline phase and introducing oxygen vacancy defects. In this work, we examined a pure anatase TiO2 as a model feedstock because of its photocatalytic attributes and well-characterized properties. After the SPP treatment, the pure anatase crystalline phase was transformed to an anatase/brookite heterocrystalline phase with oxygen vacancies. Furthermore, the SPP treatment promoted the absorption of both UV and visible light by TiO2. As a result, TiO2 treated by the SPP for 3 h showed a high gaseous photocatalytic performance (91.1%) for acetaldehyde degradation to CO2 compared with the activity of untreated TiO2 (51%). The SPP-treated TiO2 was also more active than nitrogen-doped TiO2 driven by visible light (66%). The overall photocatalytic performance was related to the SPP treatment time. The SPP technique could be used to enhance the activity of readily available feedstocks with a short processing time. These results demonstrate the potential of this method for modifying narrow-band gap metal oxides, metal sulfides, and polymer composite-based catalyst materials. The modifications of these materials are not limited to photocatalysts and could be used in a wide range of energy and environment-based applications.

    DOI: 10.1021/acsomega.7b01698

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  43. PHENIX Collaboration

    Adare A.

    Nuclear Physics A   Vol. 967   page: 996 - 1003   2017.11

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    DOI: 10.1016/S0375-9474(17)30382-2

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  44. Synthesis of Few-Layer Graphene by Peeling Graphite Flakes via Electron Exchange in Solution Plasma

    Sangwoo Chae, Maria Antoaneta Bratescu, Nagahiro Saito

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 121 ( 42 ) page: 23793 - 23802   2017.10

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    Compared with conventional graphene, few-layer graphene is an easy-to-use material because of its interesting mechanical and chemical properties. Meanwhile, solution plasma (SP) represents a nonequilibrium discharge, which induces electron exchange similar to a catalyst. Thus, SP serves as an electron donor and acceptor between organic molecules and graphite flakes in a solution. Finally, electron exchange leads to the formation of few-layer graphene by peeling graphite flakes. Furthermore, CN-functionalized few-layer graphene (f-FLG) exhibits excellent stability and dispersibility because of the balance of attractive and repulsive forces, i.e., the van der Waals force between the planes and the electrostatic force of the nitrile functional groups on the edges. In this study, f-FLG was successfully synthesized by peeling graphite flakes via electron exchange induced by SP in an aqueous solution containing an ionic liquid (IL) (1-ethyl-3-methylimidazolium dicyanamide (EMIM-DCA)). X-ray diffraction measurements revealed that the intensity of the 002 diffraction of graphite and the crystallite size along the [001] direction decreased to about S nm after SP treatment, indicating the progress of graphite flake peeling. Furthermore, the purified product comprised three layers with a crystallite size along the basal plane of about 80 nm evaluated by the deconvolution of the Raman 2D band. X-ray photoelectron spectroscopy confirmed that the synthesized f-FLG contains 7.7 atom % nitrogen, and the IR spectrum revealed the presence of the CN functional group. To understand the peeling mechanism, the ionization potential (I-P) and electron affinity (EA) of the IL in water, and the averaged electron excitation temperature (T-e) in plasma were estimated by ab initio molecular orbital calculations, cyclic voltammetry, and optical emission spectroscopy. An energy diagram of I-p, E-A, and T-e shows that SP served to pump electrons for their circulation via EMIM-DCA and to remove electrons from graphite flakes and inject into f-FLG.

    DOI: 10.1021/acs.jpcc.7b08516

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  45. Simple introduction of carboxyl head group with alkyl spacer onto multiwalled carbon nanotubes by solution plasma process

    Shimpei Nemoto, Tomonaga Ueno, Anyarat Watthanaphanit, Junko Hieda, Maria Antoaneta Bratescu, Nagahiro Saito

    Japanese Journal of Applied Physics   Vol. 56 ( 9 )   2017.9

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    A simple method of fabricating carboxyl-terminated multiwalled carbon nanotubes (MWCNTs) with alkyl spacers was developed to improve the dispersion quality of MWCNTs in aqueous solutions using solution plasma (SP) in a 6-aminocaproic acid solution. The formation of SP in the solution led to better dispersion of MWCNTs in aqueous solutions. Fourier transform infrared spectroscopy (FT-IR) results indicate that a carboxyl group with an alkyl spacer can be introduced by SP treatment in the 6-aminocaproic acid solution. Sedimentation tests show that the SP-treated MWCNTs in the 6-aminocaproic acid solution retained their good dispersion quality in aqueous solutions of pHs 5 6 and 9. The alkyl spacer plays an important role in the preservation of dispersion states particularly at pH 6.

    DOI: 10.7567/JJAP.56.096202

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  46. Generation of non-equilibrium condition in solution plasma discharge using low-pass filter circuit

    Yong Kang Heo, Seung Hyo Lee, Maria Antoaneta Bratescu, Sung Min Kim, Gyoung-Ja Lee, Nagahiro Saito

    PLASMA PROCESSES AND POLYMERS   Vol. 14 ( 8 )   2017.8

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    Solution plasma process has been researched as one of the synthetic methods of nano- and functional materials using plasma discharge in liquids. In this study, a low-pass filter circuit was introduced to increase the density and temperature of electrons involved in a non-equilibrium condition. The discharge properties of the solution plasma generated by conventional and low-pass filter circuits were characterized and comparatively analyzed. Filtration of the MHz range current oscillations, an increase in the maximum discharge current, and a higher stability of solution plasma were obtained by simply inserting a resistor-capacitor (RC) component in the circuit, which leads to the increases in the density and temperature of electrons.

    DOI: 10.1002/ppap.201600163

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  47. Simple Solution Plasma Synthesis of Hierarchical Nanoporous MnO2 for Organic Dye Removal

    Hyemin Kim, Anyarat Watthanaphanit, Nagahiro Saito

    ACS SUSTAINABLE CHEMISTRY & ENGINEERING   Vol. 5 ( 7 ) page: 5842 - 5851   2017.7

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    We have demonstrated a simple and green approach to synthesize hierarchical nanoporous MnO2 by applying plasma in a liquid precursor; the approach is named the "solution plasma process (SPP)." Three types of sugar, i.e., glucose, fructose, and sucrose, were used as inducers for the nanoporous MnO2 formation (hereafter called G-MnO2, F-MnO2, and S-MnO2). These were successfully synthesized within a few minutes (7-19 min) under ambient conditions. It was confirmed that the generated numerous reactive species (e.g., electrons, radicals, and ions) accelerated the reduction of MnO4-. The reaction rate as well as the physical and chemical features of resulting products were found to be related to the type of sugars. Their high surface areas (F-MnO2 (169.1 m(2).g(-1)) &gt; G-MnO2 (141.0 m(2)-g(-1)) &gt; S-MnO2 (85.5 m(2).g(-1))) provided efficient capability for the adsorption of cationic dye molecules, i.e., methylene blue. The dye removal efficiencies of all samples were &gt;99% for an initial dye concentration (CO of 10 mg.L-1 within 2 min and &gt;82% for C-0 = 50 mg.L-1 within 30 min. We expect that the synthesis route presented in this study can be extended to the large-scale production of effective adsorbents and to find practical applications for the industrial and green infrastructure.

    DOI: 10.1021/acssuschemeng.7b00560

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  48. The solution plasma process for heteroatom-carbon nanosheets: the role of precursors

    Koangyong Hyun, Nagahiro Saito

    SCIENTIFIC REPORTS   Vol. 7 ( 1 )   2017.6

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    The solution plasma process (SPP), known as non-equilibrium cold plasma at atmospheric pressure and room temperature, was used to investigate the synthesis of nitrogen-carbon nasnosheets (NCNs). To verify the effect of elementary composition and structure of N-methyl-2-pyrrolidone (NMP), various precursors were used in the SPP to synthesize NCNs via the bottom-up synthesis method for the first time. The NCNs were analyzed by transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. Among the various precursors, SPP of 2-pyrrolidone was demonstrated to facilitate the formation of highly ordered NCNs. On the other hand, the SPP with cyclopentanone, cyclohexanone and pyrrole did not lead to the formation of carbon nanosheets. The results of this study would uncover new parameter fields for the growth of heteroatom-carbon nanosheets using this synthesis system. In addition, the study is expected to contribute toward research in improving the large-area growth and quality of two-dimensional nanostructures, such as heteroatom-carbon nanosheets or graphene, for various applications in other synthesis methods.

    DOI: 10.1038/s41598-017-04190-x

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  49. Sodium temperature/wind lidar based on laser-diode-pumped Nd:YAG lasers deployed at Tromso, Norway (69.6 degrees N, 19.2 degrees E)

    T. D. Kawahara, S. Nozawa, N. Saito, T. Kawabata, T. T. Tsuda, S. Wada

    OPTICS EXPRESS   Vol. 25 ( 12 ) page: A491 - A501   2017.6

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    An Nd:YAG laser-based sodium temperature/wind lidar was developed for the measurement of the northern polar mesosphere and lower thermosphere at Tromso (69.6N, 19.2E), Norway. Coherent light at 589 nm is produced by sum frequency generation of 1064 nm and 1319 nm from two diode laser end-pumped pulsed Nd:YAG lasers. The output power is as high as 4W, with 4 mJ/pulse at 1000 Hz repetition rate. Five tilting Cassegrain telescopes enable us to make five-direction (zenith, north, south, east, west) observation for temperature and wind simultaneously. This highly stable laser system is first of its kind to operate virtually maintenance-free during the observation season (from late September to March) since 2010. (C) 2017 Optical Society of America

    DOI: 10.1364/OE.25.00A491

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  50. Solution plasma synthesis of a boron-carbon-nitrogen catalyst with a controllable bond structure

    SeungHyo Lee, YongKang Heo, Maria Antoaneta Bratescu, Tomonaga Ueno, Nagahiro Saito

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   Vol. 19 ( 23 ) page: 15264 - 15272   2017.6

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    Synthesis of boron-carbon-nitrogen (BCN) nanocarbon with a controllable bond structure for enhanced oxygen reduction reaction (ORR) activity and durability was performed using a new method of discharge in organic solution mixtures named the 'Solution Plasma Process'. Using selected precursors a new strategy for the simultaneous synthesis of nanocarbon co-doped with heteroatoms was found. The synergistic effect of N and B in an uncoupling bond state improved the formation of new active sites for the ORR performance by changing the electronic structure of the base carbon. Meanwhile, when B and N are bonded together, the BCN catalyst contributes to a reduced ORR activity by forming a balanced electronic structure in carbon. The BCN nanocarbon with an uncoupling bond state exhibits an enhanced ORR activity under alkaline conditions, with an onset potential of -0.25 V versus -0.31 V for B/N coupling and 3.43 transferred electrons during the ORR. Although the ORR activity of the B/N uncoupling nanocarbon was not as good as the typical Pt/C, the durability of this synthesized material (15.1% current decrease after 20000 s of operation) was significantly better than that of the Pt/C catalyst (61.5% current drop under the same conditions). After the durability test, the increase of the chemical states containing oxygen was higher for Pt/C than B/N uncoupling.

    DOI: 10.1039/c6cp06063c

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  51. Photocatalytic behavior of metal-decorated TiO2 and their catalytic activity for transformation of glycerol to value added compounds

    Trin Jedsukontorn, Nagahiro Saito, Mali Hunsom

    MOLECULAR CATALYSIS   Vol. 432   page: 160 - 171   2017.5

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    In this work, TiO2 was decorated with one of four different metals (Bi, Pd, Pt and Au) by sol immobilization at ambient condition. The individual addition of each metals on the TiO2 did not affect the crystallite size or band gap energy of TiO2, but increased its visible light absorption ability due to the localized surface plasmon resonance effect of the doped metals, except for Bi, as well as the mechanism of the charge transfer. Among all the prepared metal-decorated TiO2 photocatalysts, Au/TiO2 exhibited the highest visible light absorption ability and an appropriate mechanism of charge transfer, which consequently alleviated the e(-)-h(+) recombination. It also provided the highest photocatalytic activity for glycerol conversion (92.8% at 14 h) and yield of dihydroxyacetone, glyceraldehyde, glycolic acid, hydroxypyruvic acid and formaldehyde of 12.0, 23.1, 10.7, 13.6 and 15.3%, respectively. (C) 2017 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.mcat.2017.02.022

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  52. Conversion of cellulose into reducing sugar by solution plasma process (SPP) Reviewed

    Prasertsung I, Chutinate P, Watthanaphanit A, Saito N, Damrongsakkul S.

    Carbohydrate Polymers   Vol. 172   page: 230-236   2017

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    DOI: 10.1016/j.carbpol.2017.05.025

  53. The plasma-assisted formation of Ag@Co<inf>3</inf>O<inf>4</inf> core-shell hybrid nanocrystals for oxygen reduction reaction Reviewed

    Kim S.-M, Jo Y.-G, Lee M.-H, Saito N, Kim J.-W, Lee S.-Y.

    Electrochimica Acta   Vol. 233   page: 123-133   2017

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    DOI: 10.1016/j.electacta.2017.03.049

  54. Solution plasma synthesis of Pt/ZnO/KB for photo-assisted electro-oxidation of methanol Reviewed

    Hu X, Ge C, Su N, Huang H, Xu Y, Zhang J, Shi J, Shen X, Saito N.

    Journal of Alloys and Compounds   Vol. 692   page: 848-854   2017

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    DOI: 10.1016/j.jallcom.2016.09.032

  55. Novel synthesis of PtPd nanoparticles with good electrocatalytic activity and durability Reviewed

    Zhang J, Hu X, Yang B, Su N, Huang H, Cheng J, Yang H, Saito N.

    Journal of Alloys and Compounds   Vol. 709   page: 588-595   2017

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    DOI: 10.1016/j.jallcom.2017.03.202

  56. Enhanced ferromagnetism in graphite-like carbon layer-coated ZnO crystals Reviewed

    Tu N, Dung N.H, Lan N.T, Nguyen K.T, Dung N.D, Viet D.X, Tuan N.T, Bui H.V, Nam D.V, Huy P.T, Saito N.

    Journal of Alloys and Compounds   Vol. 695   page: 233-237   2017

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    DOI: 10.1016/j.jallcom.2016.10.200

  57. Crystallinity and surface state of cellulose in wet ball-milling process Reviewed

    Nemoto S, Ueno T, Watthanaphanit A, Hieda J, Saito N.

    Journal of Applied Polymer Science   Vol. 134 ( 22 ) page: -   2017

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    DOI: 10.1002/app.44903

  58. New insights into vegetable oil pyrolysis by cold plasma technique

    Phimpaka Meeprasertsagool, Anyarat Watthanaphanit, Tomonaga Ueno, Nagahiro Saito, Prasert Reubroycharoen

    Energy Procedia   Vol. 138   page: 1153 - 1158   2017

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Elsevier Ltd  

    Green liquid fuels are alternatively produced by pyrolysis of vegetable oil. Still, this process requires high processing temperature and high energy consumption per unit cost. Recently, solution/liquid-phase plasma (cold plasma) is the novel method to provide the direct energy at highly excited energy state. In this study, the investigation of the green fuel synthesis from vegetables oils using cold plasma was examined. The cold plasma reactor was connected to a bipolar pulsed power supply under 200 ml of palm oil, the pulse frequency adjusted from 15-45 kHz and the voltage adjusted in ranges of 1.2-1.5 kV with 40 minutes of discharge times, pulse width 2 μs, electrode distance 0.5 mm. Properties of generated plasma were investigated by optical emission spectroscopy (OES) methods. The liquid products were analysed by GC-MS. In order to identify components of the liquid product, a GC-MS chromatogram was carried out
    the main peaks were oleic acid and palmitic acid. Therefore, the other peak showed which products were cracked to short-chain hydrocarbon and hexadecane was one of the compounds which were cracked in palm oil. In conclusion, the results showed that plasma has potential and enough energy to convert vegetable oils in liquid fuels at room temperature which can also provide the direct energy better than pyrolysis.

    DOI: 10.1016/j.egypro.2017.10.224

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  59. Synthesis of carbon nanoparticles from used motor oil and benzene via solution plasma process

    Seangarunthong N.

    Key Engineering Materials   Vol. 751 KEM   page: 773 - 778   2017

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    DOI: 10.4028/www.scientific.net/KEM.751.773

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  60. The Control of Specific Surface Area of Nanocarbon Synthesized in Solution Plasma by Using the Structure of Reverse Micelle

    MORISHITA Tetsunori, UENO Tomonaga, YOSHIDA Akihito, HIEDA Junko, SAITO Nagahiro

    Journal of The Surface Finishing Society of Japan   Vol. 68 ( 3 ) page: 153 - 157   2017

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    <p>Nanocarbons were synthesized from benzene - water - sodium dodecyl sulfate(SDS)and benzene-(water-ethanol)-SDS systems using solution plasma. The stabilized emulsion formed in the benzene-water-SDS and benzene-(water-ethanol)-SDS. The specific surface areas of nanocarbons synthesized from benzene-water-SDS increased with the increase of the SDS concentration, although their variation was not great. By contrast, the surface areas of nanocarbons synthesized from benzene-(water-ethanol)-SDS were altered considerably compared to the variation in benzene-(water-ethanol)-SDS system. The maximum specific surface area was 387 m<sup>2</sup>/g. The minimum averaged pore size was 13.5 nm when the ratio of ethanol to water was 0.5. That fact suggests that the emulsion size of 50-100 nm influences the meso-structures of the obtained carbon in solution plasma processes.</p>

    DOI: 10.4139/sfj.68.153

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  61. Influences of Plasma Formation Parameters on Size of Zinc Oxides Nanoparticles Synthesized by Solution Plasma

    NEMOTO Shimpei, UENO Tomonaga, WATTHANAPHANIT Anyarat, HIEDA Junko, SAITO Nagahiro

    Journal of The Surface Finishing Society of Japan   Vol. 68 ( 3 ) page: 147 - 152   2017

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    <p>The optical and electronic performance of zinc oxide nanoparticles, which are widely used as optical and electronic materials, depends on the nanoparticle properties. The particle size is a particularly important factor affecting material properties. This study was conducted to elucidate the relation between the size of nanoparticles synthesized by solution plasma and each of several plasma formation parameters such as applied voltage, pulse width, and repetition frequency. The zinc electrodes were used to generate solution plasma. The zinc oxide nanoparticles were synthesized in solution plasma using a sputtering process. The synthesized nanoparticle shape was non-spherical. The nanoparticles were smaller than 100 nm along the long axis. Electrode sputtering occurred mainly on the cathode electrode. Therefore, positive ions in the solution plasma, e.g. H<sub>2</sub>O<sup>+</sup> and H<sub>3</sub>O<sup>+</sup>, affect the zinc oxide nanoparticle formation. However, the particle size was correlated with the applied voltage between electrodes, not with the pulse width or pulse repetition frequency.</p>

    DOI: 10.4139/sfj.68.147

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  62. Synthesis of metal and carbon nanomaterials by solution plasma process

    Hieda Junko, Ueno Tomonaga, Saito Nagahiro

    Abstract of annual meeting of the Surface Science of Japan   Vol. 37 ( 0 )   2017

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    DOI: 10.14886/sssj2008.37.0_27

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  63. Synthesis of carbon nanoparticles from used motor oil and benzene via solution plasma process

    Seangarunthong N.

    Key Engineering Materials   Vol. 751 KEM   page: 773 - 778   2017

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    DOI: 10.4028/www.scientific.net/KEM.751.773

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  64. Synthesis of metal and carbon nanomaterials by solution plasma process

    Hieda Junko, Ueno Tomonaga, Saito Nagahiro

    Abstract of annual meeting of the Surface Science of Japan   Vol. 37 ( 0 )   2017

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    Publishing type:Research paper (scientific journal)   Publisher:The Surface Science Society of Japan  

    DOI: 10.14886/sssj2008.37.0_27

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  65. The Control of Specific Surface Area of Nanocarbon Synthesized in Solution Plasma by Using the Structure of Reverse Micelle

    MORISHITA Tetsunori, UENO Tomonaga, YOSHIDA Akihito, HIEDA Junko, SAITO Nagahiro

    Journal of The Surface Finishing Society of Japan   Vol. 68 ( 3 ) page: 153 - 157   2017

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    Publishing type:Research paper (scientific journal)   Publisher:The Surface Finishing Society of Japan  

    <p>Nanocarbons were synthesized from benzene - water - sodium dodecyl sulfate(SDS)and benzene-(water-ethanol)-SDS systems using solution plasma. The stabilized emulsion formed in the benzene-water-SDS and benzene-(water-ethanol)-SDS. The specific surface areas of nanocarbons synthesized from benzene-water-SDS increased with the increase of the SDS concentration, although their variation was not great. By contrast, the surface areas of nanocarbons synthesized from benzene-(water-ethanol)-SDS were altered considerably compared to the variation in benzene-(water-ethanol)-SDS system. The maximum specific surface area was 387 m<sup>2</sup>/g. The minimum averaged pore size was 13.5 nm when the ratio of ethanol to water was 0.5. That fact suggests that the emulsion size of 50-100 nm influences the meso-structures of the obtained carbon in solution plasma processes.</p>

    DOI: 10.4139/sfj.68.153

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  66. Influences of Plasma Formation Parameters on Size of Zinc Oxides Nanoparticles Synthesized by Solution Plasma

    NEMOTO Shimpei, UENO Tomonaga, WATTHANAPHANIT Anyarat, HIEDA Junko, SAITO Nagahiro

    Journal of The Surface Finishing Society of Japan   Vol. 68 ( 3 ) page: 147 - 152   2017

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    Publishing type:Research paper (scientific journal)   Publisher:The Surface Finishing Society of Japan  

    <p>The optical and electronic performance of zinc oxide nanoparticles, which are widely used as optical and electronic materials, depends on the nanoparticle properties. The particle size is a particularly important factor affecting material properties. This study was conducted to elucidate the relation between the size of nanoparticles synthesized by solution plasma and each of several plasma formation parameters such as applied voltage, pulse width, and repetition frequency. The zinc electrodes were used to generate solution plasma. The zinc oxide nanoparticles were synthesized in solution plasma using a sputtering process. The synthesized nanoparticle shape was non-spherical. The nanoparticles were smaller than 100 nm along the long axis. Electrode sputtering occurred mainly on the cathode electrode. Therefore, positive ions in the solution plasma, e.g. H<sub>2</sub>O<sup>+</sup> and H<sub>3</sub>O<sup>+</sup>, affect the zinc oxide nanoparticle formation. However, the particle size was correlated with the applied voltage between electrodes, not with the pulse width or pulse repetition frequency.</p>

    DOI: 10.4139/sfj.68.147

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  67. In-situ one-step synthesis of carbon-encapsulated naked magnetic metal nanoparticles conducted without additional reductants and agents

    Kang J.

    Scientific Reports   Vol. 6   2016.12

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    DOI: 10.1038/srep38652

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  68. In-situ one-step synthesis of carbon-encapsulated naked magnetic metal nanoparticles conducted without additional reductants and agents

    Kang J.

    Scientific Reports   Vol. 6   2016.12

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    DOI: 10.1038/srep38652

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  69. Fastest Formation Routes of Nanocarbons in Solution Plasma Processes

    Morishita T.

    Scientific Reports   Vol. 6   2016.11

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    DOI: 10.1038/srep36880

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  70. Effect of electron acceptors H<inf>2</inf>O<inf>2</inf> and O<inf>2</inf> on the generated reactive oxygen species <sup>1</sup>O<inf>2</inf> and OH<sup>·</sup> in TiO<inf>2</inf>-catalyzed photocatalytic oxidation of glycerol

    Jedsukontorn T.

    Cuihua Xuebao/Chinese Journal of Catalysis   Vol. 37 ( 11 ) page: 1975 - 1981   2016.11

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    Publishing type:Research paper (scientific journal)   Publisher:Cuihua Xuebao/Chinese Journal of Catalysis  

    DOI: 10.1016/S1872-2067(16)62519-6

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  71. Self-Other Distinction Enhanced Empathic Responses in Individuals with Alexithymia

    Saito N.

    Scientific Reports   Vol. 6   2016.10

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    DOI: 10.1038/srep35059

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  72. Differences in intermediate structures and electronic states associated with oxygen adsorption onto Pt, Cu, and Au clusters as oxygen reduction catalysts

    Morishita T.

    Journal of Physics D: Applied Physics   Vol. 49 ( 41 )   2016.9

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    DOI: 10.1088/0022-3727/49/41/415305

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  73. Use of distributed sensor networks with optical fibers (brillouin scattering) for SHM of composite structures

    Saito N.

    Structural Health Monitoring Technologies and Next-Generation Smart Composite Structures     page: 27 - 60   2016.9

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    Publishing type:Research paper (scientific journal)   Publisher:Structural Health Monitoring Technologies and Next-Generation Smart Composite Structures  

    DOI: 10.4324/9781315373492

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  74. Fabrication of bacterial cellulose-ZnO composite via solution plasma process for antibacterial applications Reviewed

    Nattakammala Janpetch, Nagahiro Saito, Ratana Rujiravanit

    CARBOHYDRATE POLYMERS   Vol. 148   page: 335 - 344   2016.9

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    Zinc oxide (ZnO) was successfully synthesized by applying a solution plasma, a plasma discharge in a liquid phase, without the addition of a reducing agent and simultaneously deposited into a bacterial cellulose pellicle that functioned as a template. By the reasons of its nano-sized structure as well as favorable porous configuration, the BC pellicle has been proved to be a splendid upholding template for the coordination of ZnO. In addition, the ZnO-deposited BC composites demonstrated strong antibacterial activity without a photocatalytic reaction against both Staphylococcus aureus and Escherichia coli. Hence, the ZnO-deposited BC composites can be used as an antibacterial material in wound dressing and water disinfection applications. (C) 2016 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.carbpol.2016.04.066

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  75. High Efficiency DNA Extraction by Graphite Oxide/Cellulose/Magnetite Composites Under Na+ Free System Reviewed

    Garbis Atam Akceoglu, Oi Lun Li, Nagahiro Saito

    JOM   Vol. 68 ( 4 ) page: 1071 - 1077   2016.4

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    DNA extraction is the key step at various research areas like biotechnology, diagnostic development, paternity determination, and forensic science . Solid support extraction is the most common method for DNA purification. In this method, Na+ ions have often been applied as binding buffers in order to obtain high extraction efficiency and high quality of DNA; however, the presence of Na+ ions might be interfering with the downstream DNA applications. In this study, we proposed graphite oxide (GO)/magnetite composite/cellulose as an innovative material for Na+-free DNA extraction. The total wt.% of GO was fixed at 4.15% in the GO/cellulose/magnetite composite . The concentration of magnetite within the composites were controlled at 0-3.98 wt.%. The extraction yield of DNA increased with increasing weight percentage of magnetite. The highest yield was achieved at 3.98 wt.% magnetite, where the extraction efficiency was reported to be 338.5 ng/A mu l. The absorbance ratios between 260 nm and 280 nm (A260/A280) of the DNA elution volume was demonstrated as 1.81, indicating the extracted DNA consisted of high purity. The mechanism of adsorption of DNA was provided by (1) pi-pi interaction between the aromatic ring in GO and nucleobases of DNA molecule, and (2) surface charge interaction between the positive charge magnetite and anions such as phosphates within the DNA molecules. The results proved that the GO/cellulose/magnetite composite provides a Na+-free method for selective DNA extraction with high extraction efficiency of pure DNA.

    DOI: 10.1007/s11837-016-1826-0

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  76. Heterocarbon nanosheets incorporating iron phthalocyanine for oxygen reduction reaction in both alkaline and acidic media Reviewed

    Koangyong Hyun, Tomonaga Ueno, Gasidit Panomsuwan, Oi Lun Li, Nagahiro Saito

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   Vol. 18 ( 16 ) page: 10856 - 10863   2016.4

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    Heterocarbon nanosheets incorporating iron phthalocyanine (FP-NCNs-SP) have been successfully synthesized by a facile one-pot solution plasma process at high repetition frequency. It was found that the Fe-N-4 catalytic active sites could be preserved on the FP-NCNs-SP without degradation. The FP-NCNs-SP also possessed large surface area, good conductivity and high degree of graphitization. Electrochemical evaluations demonstrated that NCNs-SP had excellent electrocatalytic activity and selectivity toward oxygen reduction reaction (ORR) in alkaline medium through a direct four-electron pathway. Although the significant improvement in ORR activity was clearly observed in acidic medium, it was much poorer than in alkaline medium. We believe that the results presented in this work will shed light on the advanced synthesis and design of ORR electrocatalysts at room temperature with an abundance of catalytically active sites and high ORR performance.

    DOI: 10.1039/c5cp07739g

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  77. Synthesis of Fe-Cu bi-functional catalysts by solution plasma process for li-air battery application

    Li O.L.

    International Journal of Plasma Environmental Science and Technology   Vol. 10 ( 1 ) page: 51 - 56   2016.3

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  78. Electrocatalytic oxygen reduction on nitrogen-doped carbon nanoparticles derived from cyano-aromatic molecules via a solution plasma approach Reviewed

    Gasidit Panomsuwan, Nagahiro Saito, Takahiro Ishizaki

    CARBON   Vol. 98   page: 411 - 420   2016.3

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    Metal-free nitrogen-doped carbon nanoparticles (NCNPs) have been synthesized via a solution plasma process with the potential to achieve uniformly distributed nitrogen atoms. A set of cyano-aromatic molecules, including benzonitrile, 2-cyanopyridine, and cyanopyrazine, were used as a single-source precursor in the synthesis without the addition of a metal catalyst source. The resultant NCNPs reveal uniformly nanosized particles (20-40 nm) and an interconnected hierarchical pore structure with a high specific surface area (210-250 m(2) g(-1)). The difference in carbon/nitrogen mole ratios of organic precursors gives rise to the variation of nitrogen-doping level in NCNPs from 0.63 to 1.94 atom %. Detailed electrochemical evaluation toward the oxygen reduction reaction (ORR) demonstrates that NCNPs exhibit a significant improvement in terms of both onset potential and current density under alkaline and acidic conditions. The predominant distribution of graphitic-N and pyridinic-N sites on NCNPs plays an essential role in enhancing the ORR activity and the selectivity toward a four-electron reduction pathway. More importantly, NCNPs possess excellent robust long-term durability and strong methanol tolerance compared with those of a commercial Pt/carbon catalyst. (C) 2015 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.carbon.2015.11.013

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  79. Nitrogen-Doped Carbon Nanoparticle-Carbon Nanofiber Composite as an Efficient Metal-Free Cathode Catalyst for Oxygen Reduction Reaction Reviewed

    Gasidit Panomsuwan, Nagahiro Saito, Takahiro Ishizaki

    ACS APPLIED MATERIALS & INTERFACES   Vol. 8 ( 11 ) page: 6962 - 6971   2016.3

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    Metal-free nitrogen-doped carbon material's are currently considered at the forefront of potential alternative cathode catalysts for the oxygen reduction reaction (ORR) in fuel cell technology. Despite numerous efforts in this area over the past decade, rational design and development of a new catalyst system based on nitrogen-doped carbon materials via an innovative approach still present intriguing challenges in ORR catalysis research. Herein, a new kind of nitrogen-doped carbon nanoparticle-carbon nanofiber (NCNP-CNF) composite with highly efficient and stable ORR catalytic activity has been developed via a new approach assisted by a solution plasma process. The integration of NCNPs and CNFs by the solution plasma process can lead to a unique morphological feature and modify physicochemical properties. The NCNP-CNF composite exhibits a significantly enhanced ORR activity through a dominant four-electron pathway in an alkaline solution. The enhancement in ORR activity of NCNP-CNF composite can be attributed to the synergistic effects of good electron transport from highly graphitized CNFs as well as abundance of exposed catalytic sites and meso/macroporosity from NCNPs. More importantly, NCNP-CNF composite reveals excellent long-term durability and high tolerance to methanol crossover compared with those of a commercial 20 wt % supported on Vulcan XC-72. We expect that NCNP-CNF composite prepared by this synthetic approach can be a promising metal-free cathode catalyst candidate for ORR in fuel cells and metal-air batteries.

    DOI: 10.1021/acsami.5b10493

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  80. Effect of treatment time in the Mg(OH)(2)/Mg-Al LDH composite film formed on Mg alloy AZ31 by steam coating on the corrosion resistance Reviewed

    Kamiyama, N; Panomsuwan, G; Yamamoto, E; Sudare, T; Saito, N; Ishizaki, T

    SURFACE & COATINGS TECHNOLOGY   Vol. 286   page: 172-177   2016.1

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    DOI: 10.1016/j.surfcoat.2015.11.051

  81. Development and Evaluation of Pencil Type Solution Plasma Reactor Reviewed

      Vol. 40 ( 1 ) page: 26-31   2016.1

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  82. Analysis of benzoquinone decomposition in solution plasma process Reviewed

    M. A. Bratescu, N. Saito

    JOURNAL OF INSTRUMENTATION   Vol. 11 ( 1 ) page: -   2016.1

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    The decomposition of p-benzoquinone (p-BQ) in Solution Plasma Processing (SPP) was analyzed by Coherent Anti-Stokes Raman Spectroscopy (CARS) by monitoring the change of the anti-Stokes signal intensity of the vibrational transitions of the molecule, during and after SPP. Just in the beginning of the SPP treatment, the CARS signal intensities of the ring vibrational molecular transitions increased under the influence of the electric field of plasma. The results show that plasma influences the p-BQ molecules in two ways: (i) plasma produces a polarization and an orientation of the molecules in the local electric field of plasma and (ii) the gas phase plasma supplies, in the liquid phase, hydrogen and hydroxyl radicals, which reduce or oxidize the molecules, respectively, generating different carboxylic acids. The decomposition of p-BQ after SPP was confirmed by UV-visible absorption spectroscopy and liquid chromatography.

    DOI: 10.1088/1748-0221/11/01/C01009

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    Other Link: http://orcid.org/0000-0001-8757-3933

  83. Adsorption of carbon dioxide by solution-plasma-synthesized heteroatom-doped carbon nanospheres Reviewed

    Thongwichit Nanthiya, Li Oi Lun Helena, Yaowarat Wattanachai, Saito Nagahiro, Suriyapraphadilok Uthaiporn

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 55 ( 1 )   2016.1

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    DOI: 10.7567/JJAP.55.01AE10

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  84. Adsorption of carbon dioxide by solution-plasma-synthesized heteroatom-doped carbon nanospheres Reviewed

    Thongwichit, N; Li, OLH; Yaowarat, W; Saito, N; Suriyapraphadilok, U

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 55 ( 1 ) page: 01AE10   2016.1

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    DOI: 10.7567/JJAP.55.01AE10

  85. Synthesis of SnO2 nanoparticles using a solution plasma and their gas-sensing properties Reviewed

    Jianbo Zhang, Xiulan Hu, Junjun Shi, Ping Lu, Xiaodong Shen, Peifeng Xu, Nagahiro Saito

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 55 ( 1 ) page: 01AE17   2016.1

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    A simple solution plasma method was applied to the synthesis of SnO2 nanoparticles directly from tin(II) chloride solution, without adding any precipitant, stabilizer, or other agents at atmospheric pressure, because solution plasma provides a reaction field with a highly excited energy state. The results of X-ray power diffraction (XRD) analysis and transmission electron microscopy (TEM) verified that well-crystallized SnO2 nanoparticles in the size range of 2-5 nm were synthesized. SnO2 nanoparticles show satisfactory sensitivities to acetaldehyde and ethanol. (C) 2016 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.55.01AE17

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  86. Synthesis of nitrogen-containing carbon by solution plasma in aniline with high-repetition frequency discharges Reviewed

    Koangyong Hyun, Tomonaga Ueno, Nagahiro Saito

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 55 ( 1 ) page: 01AE18   2016.1

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    Nitrogen-containing carbon nanoparticles were synthesized in aniline by solution plasma with high-repetition frequency discharges. We developed a bipolar pulsed power supply that can apply high-repetition frequencies ranging from 25 to 200 kHz. By utilizing high-repetition frequencies, conductive carbons were directly synthesized. The crystallinity was increased and H/C ratio of carbon was decreased. Furthermore, nitrogen atoms were simultaneously embedded in the carbon matrix. Due to the presence of nitrogen atoms, the conductivity and electrocatalytic activity of the samples were remarkably improved compared to that of a pure carbon matrix synthesized from a benzene precursor. (C) 2016 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.55.01AE18

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  87. Highly durable silica-coated Pt/carbon nanotubes for proton-exchange membrane fuel cells application Reviewed

    Wattanachai Yaowarat, Oi Lun Helena Li, Nagahiro Saito

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 55 ( 1 ) page: 01AE23   2016.1

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    Platinum nanoparticles supported on carbon nanotubes (Pt/CNTs) have been used as an electrocatalyst in proton-exchange membrane fuel cells (PEMFCs). These catalysts show higher activity in oxygen reduction reaction in PEMFCs than conventional carbon-black-supported Pt nanoparticles. However, their durability is lower than that of other metal-alloy-based or nonmetal-based catalysts. In this study, Pt/CNTs were synthesized by solution plasma followed by coating with silica layer by the sol-gel method using a cationic surfactant [ cetyltrimethylammonium bromide (CTAB)]. This material can be used as a cathode in PEMFCs. The silica layer was coated on the surface of Pt/CNTs to prevent agglomeration and detachment of Pt nanoparticles from carbon nanotubes during operation. The formation of silica layers significantly improved the durability of the Pt/CNT catalysts under acidic conditions. After 300 cycles of the cyclic voltammetry test in 0.5#M sulfuric acid (H2SO4), silica-coated Pt/CNTs increased the durability by 43.0 and 24.0% compared with those of noncoated commercial Pt/C and Pt/CNTs, respectively. (C) 2016 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.55.01AE23

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  88. <b>Solution Plasma Reaction Field for Materials Synthesi</b><b>s </b>

    SUDARE Tomohito, UENO Tomonaga, SAITO Nagahiro

    Journal of MMIJ   Vol. 132 ( 2 ) page: 47 - 52   2016

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Mining and Materials Processing Institute of Japan  

    DOI: 10.2473/journalofmmij.132.47

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  89. Enhancement of conductivity in nano carbon balls by the addition of carbon tetrachloride via room temperature solution plasma process Reviewed

    Oi Lun Li, Hiroki Hayashi, Takahiro Ishizaki, Nagahiro Saito

    RSC ADVANCES   Vol. 6 ( 57 ) page: 51864 - 51870   2016

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    The conductivity of carbon nanoballs (CNBs) was enhanced by two orders of magnitude with the addition of carbon tetrachloride through a room temperature solution plasma process without post-heat treatment. The synthesized CNBs demonstrated the lowest resistivity of 8 U cm when the ratio of benzene to carbon tetrachloride was adjusted to 3 : 2. The morphologies from Transmission Electron Microscopy (TEM) showed the benzene-synthesized CNBs appeared as amorphous carbon while CNBs generated from the mixture of carbon tetrachloride and benzene were presented as short range graphite with turbostratic structure. From Raman spectroscopy and X-ray diffraction patterns, the results indicated the transition from amorphous carbon to nanocrystalline-graphite (NCG). From chemical elemental analysis, the hydrogen mole percentage decreased 20-50% when 20-60 vol% of carbon tetrachloride was added into benzene. We expect that this approach can be extended to enhance the conductivity of all kinds of amorphous carbonaceous materials in other synthesis technologies under room temperature.

    DOI: 10.1039/c6ra02453j

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  90. A simple synthesis method for nanostructured Co-WC/carbon composites with enhanced oxygen reduction reaction activity Reviewed

    Kang, J, Kim, H, Saito, N, Lee, MH

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   Vol. 17 ( 1 ) page: 37-44 - 44   2016

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    DOI: 10.1080/14686996.2016.1140305

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  91. Synthesis of heteroatom-carbon nanosheets by solution plasma processing using N-methyl-2-pyrrolidone as precursor Reviewed

    Koangyong Hyun, Tomonaga Ueno, Oi Lun Li, Nagahiro Saito

    RSC ADVANCES   Vol. 6 ( 9 ) page: 6990 - 6996   2016

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    Nitrogen-carbon nanosheets (NCNS), composed of multi-layer graphene with turbostratic stacking, were successfully synthesized through a solution plasma processing (SPP) at room temperature and an atmospheric pressure. The plasma was generated in 200 mL of N-methyl-2-pyrrolidone (NMP), which was applied as the carbon and nitrogen precursors. The NCNS presented an electrical resistivity of 0.065 Omega cm, which is comparable with that of N-doped carbon nanofibers (CNFs) and N-doped carbon nanotubes (CNTs). The synthesis rate of NCNS was 20 mg min(-1). From the characteristics analyses, NCNS showed the surface area of 277 m(2) g(-1), a pore volume of 0.95 cm(3) g(-1) and a moderate nitrogen content of 1.3 at%. The synthesized NCNS also exhibited catalytic activity towards oxygen reduction reaction (ORR). This unique synthesis method can be applicable to synthesize multiple types of heteroatom-carbon nanosheets.

    DOI: 10.1039/c5ra23659b

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  92. Synthesis of colloidal MnO2 with a sheet-like structure by one-pot plasma discharge in permanganate aqueous solution Reviewed

    Hyemin Kim, Anyarat Watthanaphanit, Nagahiro Saito

    RSC ADVANCES   Vol. 6 ( 4 ) page: 2826 - 2834   2016

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    Stable colloidal MnO2-consisting of MnO2 with a sheet-like structure-was synthesized by solution plasma process (SPP). The synthesis was completed in one-step by discharging the plasma in potassium permanganate (KMnO4) aqueous solution without using any dispersants or stabilizers. An alteration of the manganese oxide oxidation state, from MnO4- to MnO2 as a function of the discharge time, was investigated by UV-vis spectroscopy. Morphology and elemental constituents were observed by TEM and EDS mapping. Results indicated that the discharge time was an important feature for the formation of MnO2 in the SPP system. Specifically at neutral pH (pH = 7), MnO4- was completely reduced to MnO2 within a discharge time of 18 min. After that the obtained MnO2 was converted rapidly to Mn2+. To better understand the possible pathways of MnO2 formation by the SPP, we compared aspects of the reaction under different pH conditions. Formation of MnO2 under additional, controlled pH conditions, i.e. 2 and 12, was studied. Results suggested that hydrogen species played a key role for the reduction of MnO4- in the water-based SPP system. In comparison to the existing routes for the synthesis of MnO2 nanosheets with a single or low number of layers, the SPP holds excellent promise as an effective alternative means regarding its simplicity, time-energy preserving, and scalability.

    DOI: 10.1039/c5ra20416j

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  93. DFT calculation of oxygen adsorption on a core-single shell ZnNb catalyst

    Morishita T.

    RSC Advances   Vol. 6 ( 100 ) page: 98091 - 98095   2016

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    DOI: 10.1039/c6ra19311k

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  94. Fe-N-doped carbon-based composite as an efficient and durable electrocatalyst for the oxygen reduction reaction

    Panomsuwan G.

    RSC Advances   Vol. 6 ( 115 ) page: 114553 - 114559   2016

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    DOI: 10.1039/C6RA24214F

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  95. The Effect of Solvent Composition on Synthesis Rate of Gold Nanoparticles by Sputtering Method of Solution Plasma

    SUDARE Tomohito, UENO Tomonaga, WATTHANAPHANIT Anyarat, SAITO Nagahiro

    Journal of The Surface Finishing Society of Japan   Vol. 67 ( 1 ) page: 46 - 50   2016

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    For this study, we applied a specific type of plasma in liquid phase named "solution plasma process(SPP)" for high-speed synthesis of gold nanoparticles(AuNPs)using an ethanol-water mixture as a liquid medium. Sputtering was conducted for the AuNP production. By applying high voltage across a pair of gold electrodes(∅=1.0 mm)immersed in the liquid medium, ions formed in the plasma collided with the gold electrode surface and caused sputtering of the gold atoms. Subsequently, these atoms formed AuNPs immediately before dispersal into the medium. We inferred that the medium properties greatly influenced the SPP system sputtering mechanism. Accordingly, the influence of the ethanol-water mixture composition on the formation mechanism was studied in addition to the yield of the synthesized AuNPs. Results indicate that composition of the ethanol-water mixtures strongly influenced the breakdown conditions for the plasma formation and that the largest current observed at the ethanol mole fraction was 0.089-0.14. It is particularly interesting that this composition of the ethanol-water mixture led to the highest AuNPs formation yield. Our findings suggest that high-speed synthesis of metal nanoparticles in the SPP system is achievable by altering the type and/or composition of the liquid medium.

    DOI: 10.4139/sfj.67.46

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  96. DFT calculation of oxygen adsorption on a core-single shell ZnNb catalyst

    Morishita T.

    RSC Advances   Vol. 6 ( 100 ) page: 98091 - 98095   2016

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    DOI: 10.1039/c6ra19311k

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  97. Fe-N-doped carbon-based composite as an efficient and durable electrocatalyst for the oxygen reduction reaction

    Panomsuwan G.

    RSC Advances   Vol. 6 ( 115 ) page: 114553 - 114559   2016

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    DOI: 10.1039/C6RA24214F

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  98. The Effect of Solvent Composition on Synthesis Rate of Gold Nanoparticles by Sputtering Method of Solution Plasma

    SUDARE Tomohito, UENO Tomonaga, WATTHANAPHANIT Anyarat, SAITO Nagahiro

    Journal of The Surface Finishing Society of Japan   Vol. 67 ( 1 ) page: 46 - 50   2016

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    Publishing type:Research paper (scientific journal)   Publisher:The Surface Finishing Society of Japan  

    For this study, we applied a specific type of plasma in liquid phase named "solution plasma process(SPP)" for high-speed synthesis of gold nanoparticles(AuNPs)using an ethanol-water mixture as a liquid medium. Sputtering was conducted for the AuNP production. By applying high voltage across a pair of gold electrodes(∅=1.0 mm)immersed in the liquid medium, ions formed in the plasma collided with the gold electrode surface and caused sputtering of the gold atoms. Subsequently, these atoms formed AuNPs immediately before dispersal into the medium. We inferred that the medium properties greatly influenced the SPP system sputtering mechanism. Accordingly, the influence of the ethanol-water mixture composition on the formation mechanism was studied in addition to the yield of the synthesized AuNPs. Results indicate that composition of the ethanol-water mixtures strongly influenced the breakdown conditions for the plasma formation and that the largest current observed at the ethanol mole fraction was 0.089-0.14. It is particularly interesting that this composition of the ethanol-water mixture led to the highest AuNPs formation yield. Our findings suggest that high-speed synthesis of metal nanoparticles in the SPP system is achievable by altering the type and/or composition of the liquid medium.

    DOI: 10.4139/sfj.67.46

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  99. Adsorption and desorption of DNA tuned by hydroxyl groups in graphite oxides-based solid extraction material Reviewed

    Garbis Atam Akceoglu, Oi Lun Li, Nagahiro Saito

    COLLOIDS AND SURFACES B-BIOINTERFACES   Vol. 136   page: 1 - 6   2015.12

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    The extraction of DNA is the most crucial method used in molecular biology. Up to date silica matrices has been widely applied as solid support for selective DNA adsorption and extraction. However, since adsorption force of Si OH functional groups is much greater than that of desorption force, the DNA extraction efficiency of silica surfaces is limited. In order to increase the DNA extraction yield, a new surface with different functional groups which possess of greater desorption property is required. In this study, we proposed cellulose/graphite oxide (GO) composite as an alternative material for DNA adsorption and extraction. GO/Cellulose composite provides the major adsorption and desorption of DNA by C-OH, which belongs to alkyl or phenol type of OH functional group. Compared to Si OH, C-OH is less polarized and reactive, therefore the composite might provide a higher desorption of DNA during the elution process. The GO/cellulose composite were prepared in spherical structure by mixing urea, cellulose, NaOH, Graphite oxide and water. The concentration of GO within the composites were controlled to be 0-4.15 wt.%. The extraction yield of DNA increased with increasing weight percentage of GO. The highest yield was achieved at 4.15 wt.% GO, where the extraction efficiency was reported as 660.4 ng/mu l when applying 2 M GuHCl as the binding buffer. The absorbance ratios between 260 nm and 280 nm (A260/A280) of the DNA elution was demonstrated as 1.86, indicating the extracted DNA consisted of high purity. The results proved that GO/cellulose composite provides a simple method for selective DNA extraction with high extraction efficiency of pure DNA. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.colsurfb.2015.07.080

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  100. Route of glycerol conversion and product generation via TiO2-induced photocatalytic oxidation in the presence of H2O2 Reviewed

    Trin Jedsukontorn, Vissanu Meeyoo, Nagahiro Saito, Mali Hunsom

    CHEMICAL ENGINEERING JOURNAL   Vol. 281   page: 252 - 264   2015.12

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    The objective of this study was to explore the route of glycerol conversion and product generation via the TiO2-induced photocatalytic oxidation in the presence of H2O2. Effects of TiO2 dosage (1-3 g/L), H2O2 concentration (0.3-1.5 M), light UV intensity (1.1-4.7 mW/cm(2)) and irradiation time (4-8 h) on the level of glycerol conversion and product selectivity were identified using a 2(k) factorial design. It was found that TiO2 and H2O2 played a simultaneous positive effect on the glycerol conversion in the presence of UV-light. Among all investigated parameters, the most important parameter on glycerol conversion and product selectivity was the irradiation time. Glycerol conversion and product generation can proceed via both h(+)-mediate and radical-mediated routes, but the radical-mediated route was dominant. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cej.2015.06.078

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  101. Verification of Radicals Formation in Ethanol-Water Mixture Based Solution Plasma and Their Relation to the Rate of Reaction Reviewed

    Tomohito Sudare, Tomonaga Ueno, Anyarat Watthanaphanit, Nagahiro Saito

    JOURNAL OF PHYSICAL CHEMISTRY A   Vol. 119 ( 48 ) page: 11668 - 11673   2015.12

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    Our previous research demonstrated that using ethanol water mixture as a liquid medium for the synthesis of gold nanoparticles by the solution plasma process (SPP) could lead to an increment of the reaction rate of similar to 35.2 times faster than that in pure water. This drastic change was observed when a small amount of ethanol, that is, at an ethanol mole fraction (chi(ethanol)) of 0.089, was added in the system. After this composition, the reaction rate decreased continuously. To better understand what happens in the ethanol-water mixture-based SPP, in this study, effect of the ethanol content on the radical formation in the system was verified. We focused on detecting the magnetic resonance of electronic spins using electron spin resonance spectroscopy to determine the type and quantity of the generated radicals at each chi(ethanol). Results indicated that ethanol radicals were generated in the ethanol water mixtures and exhibited maximum quantity at the chi(ethanol) of 0.089. Relationship between the ethanol radical yield and the rate of reaction, along with possible mechanism responsible for the observed phenomenon, is discussed in this paper.

    DOI: 10.1021/acs.jpca.5b07224

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  102. Innovative Graphite Oxide-Cellulose Based Material Specific for Genomic DNA Extraction Reviewed

    Garbis Atam Akceoglu, Oi Lun Li, Nagahiro Saito

    JOM   Vol. 67 ( 11 ) page: 2557 - 2563   2015.11

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    Extraction of genomic DNA from various types of samples is often challenging for commercial silica spin column. In this study, we proposed graphite oxide (GO)/cellulose composite as an alternative material for genomic DNA extraction. The purity of DNA and extraction efficiency were compared to that of commercial silica product. In this study, the total weight % of GO was fixed at 4.15% in GO/Cellulose composite. Chewed gum, nail clip, cigarette bud paper, animal tissue and hair sample were used as various genomic DNA sources for extraction experiments. Among all types of samples, the extraction efficiencies were 4 to 12 times higher than that of commercial silica spin column. The absorbance ratio of 260 nm to 280 nm (A260/A280) of all samples ranged between 1.6 and 2.0. The results demonstrated that GO/Cellulose composites might serve as an innovative solid support material for genomic DNA extraction.

    DOI: 10.1007/s11837-015-1610-6

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  103. The Effect of Electrode Gap Distance on the Synthesis of Carbon Materials by Using Solution Plasma Process Reviewed

    Hoonseung Lee, Tomonaga Ueno, Nagahiro Saito

    JOM   Vol. 67 ( 11 ) page: 2550 - 2556   2015.11

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    Carbon nanomaterials were synthesized by using the solution plasma process and the carbon structure was precisely controlled through adjusting electrode gap distances. Transmission electron microscope and diffraction images showed ordered graphitic layers and clear ring patterns when the electrode distance was wider. The measurement of conductive properties has been improved approximately 400 times from 19 k Omega cm to 47 Omega cm, and the C/H ratio from the result of elemental analysis decreased from 0.31 to 0.18 with decreasing resistivity of carbon. These results showed that the electrode distance was an important factor to control the energy input during the synthesis of carbon materials in the plasma/gas zone generated by solution plasma processing and strongly affect the properties of synthesized carbon materials.

    DOI: 10.1007/s11837-015-1660-9

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  104. Electrocatalytic oxygen reduction activity of boron-doped carbon nanoparticles synthesized via solution plasma process Reviewed

    Gasidit Panomsuwan, Nagahiro Saito, Takahiro Ishizaki

    ELECTROCHEMISTRY COMMUNICATIONS   Vol. 59   page: 81 - 85   2015.10

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    The synthesis of boron-doped carbon nanopartides (BCNP) has been achieved through a solution plasma process without the addition of a metal catalyst source using a mixture of benzene and triphenyl borate as precursor. The electrocatalytic activity toward the oxygen reduction reaction (ORR) of BCNP can be improved in terms of onset potential and current density compared to that of undoped carbon nanoparticles in alkaline solution. Moreover, BCNP possesses superior long-term durability and tolerance to methanol oxidation in the ORR. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.elecom.2015.07.005

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  105. Thermal plasma treatment of stormwater sediments: comparison between DC non-transferred and partially transferred arc plasma

    Li O. L., Guo Y., Chang J. S., Saito N.

    ENVIRONMENTAL TECHNOLOGY   Vol. 36 ( 13 ) page: 1672 - 1679   2015.7

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    DOI: 10.1080/09593330.2014.1003981

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  106. Thermal plasma treatment of stormwater sediments: comparison between DC non-transferred and partially transferred arc plasma

    Li O. L., Guo Y., Chang J. S., Saito N.

    ENVIRONMENTAL TECHNOLOGY   Vol. 36 ( 13 ) page: 1672 - 1679   2015.7

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    DOI: 10.1080/09593330.2014.1003981

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  107. A new approach of nonpoint source pollution/stormwater sludge treatment by an integrated thermal plasma system

    Li O. L., Guo Y., Chang J. S., Urashima K., Saito N.

    INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY   Vol. 12 ( 5 ) page: 1769 - 1778   2015.5

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    Publishing type:Research paper (scientific journal)   Publisher:International Journal of Environmental Science and Technology  

    DOI: 10.1007/s13762-014-0570-7

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  108. A new approach of nonpoint source pollution/stormwater sludge treatment by an integrated thermal plasma system

    Li O. L., Guo Y., Chang J. S., Urashima K., Saito N.

    INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY   Vol. 12 ( 5 ) page: 1769 - 1778   2015.5

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    DOI: 10.1007/s13762-014-0570-7

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  109. One-step facile synthesis of carbon-supported PdAu nanoparticles and their electrochemical property and stability Reviewed

    Xiulan Hu, Junjun Shi, Jianbo Zhang, Weiping Tang, Haikui Zhu, Xiaodong Shen, Nagahiro Saito

    JOURNAL OF ALLOYS AND COMPOUNDS   Vol. 619   page: 452 - 457   2015.1

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    Well-crystallized PdAu nanoparticles supported on Ketjen Black (KB) were successfully fabricated when both Pd and Au wires were served as the electrode pair by a solution plasma technique at atmospheric pressure. The synthesis of PdAu nanoparticles was almost simultaneous with their dispersion on KB. As-obtained PdAu nanoparticles were confirmed to be alloy by ultraviolet-visible spectrophotometer, transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX) of each particle. PdAu nanoparticles with the average diameter of 2-5 nm were equably distributed on KB. PdAu nanopartides showed good electrocatalytic activity both in acidic and alkaline solution corresponding to their obvious oxidation and reduction features. PdAu nanoparticles have improved electrochemical stability compared with the electrochemical properties of Pd and Au nanoparticles mixture after long time multi-scan cyclic voltammetry. Multi-scan cyclic voltammetry also presented the PdAu nanoparticles in alkaline solution have better stability than that in acidic solution. Thus as-obtained PdAu alloy nanoparticles would become a promising electrocatalysts for fuel cells or Li-air batteries. This novel process showed its potential applications in designing optimization of catalysts for fuel cells or Li-air batteries in future. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2014.09.051

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  110. Solution Plasma Synthesis of Platinum Nanoparticles in Mesoporous Silica and Characterization of their Catalytic Property in Selective Oxidation Reaction of CO

    AOKI Yoshie, ZETTSU Nobuyuki, YAMAMOTO Takahisa, NAMBU Hironobu, SAITO Nagahiro

    Journal of The Surface Finishing Society of Japan   Vol. 66 ( 2 ) page: 70 - 72   2015

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    DOI: 10.4139/sfj.66.70

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  111. Improvement of Electric Conductivity of Carbon Materials with introducing Naphthalene and Anthracene by Using Solution Plasma Process

    LEE Hoonseung, UENO Tomonaga, SAITO Nagahiro

    Journal of The Surface Finishing Society of Japan   Vol. 66 ( 9 ) page: 416 - 419   2015

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    Many studies of recent decades have specifically examined high-performance carbon materials for application in next-generation batteries. Recently, an innovative technology named solution plasma (SP) has been drawing attention to carbon material synthesis. The most attractive aspect of SP is that, through this technology, the physical and chemical properties of synthesized carbon can be altered easily by varying the organic solvent. However, the conductivity of the SP synthesized carbon requires further improvement for application as an electrode material. In this study, molecules having π orbitals such as naphthalene or anthracene were introduced into benzene solvent to improve the conductivity of the synthesized carbon. Results of resistance measurements show that the resistance values of naphthalene (26.4 Ωcm) and anthracene (16.6 Ωcm) introduced carbons were improved by about 4 and 6 times, respectively, compared to carbon obtained from pure benzene (104 Ωcm). Details of the effects of solutes on the crystallinity and conductivity of the synthesized carbon are discussed.

    DOI: 10.4139/sfj.66.416

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  112. Nitrogen-doped carbon nanoparticles derived from acrylonitrile plasma for electrochemical oxygen reduction Reviewed

    Panomsuwan Gasidit, Saito Nagahiro, Ishizaki Takahiro

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   Vol. 17 ( 9 ) page: 6227-6232   2015

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    DOI: 10.1039/c4cp05995f

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  113. Accelerated nanoparticles synthesis in alcohol-water-mixture-based solution plasma Reviewed

    Tomohito Sudare, Tomonaga Ueno, Anyarat Watthanaphanit, Nagahiro Saito

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   Vol. 17 ( 45 ) page: 30255 - 30259   2015

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    An extraordinary high-speed synthesis of gold nanoparticles (AuNPs) was discovered by synthesizing the AuNPs in ethanol-water mixtures using a solution plasma process (SPP). The influence of the ethanol mole fraction (vethanol) in the ethanol-water mixtures on the reduction rate of gold chloride ions to AuNPs under the SPP system was studied. The results indicated that the reaction rate of the AuNPs synthesis exhibited a maximum value (i.e. 35.2 times faster than in a pure water system) at the significant point where the partial molar volumes of ethanol and water changed drastically.

    DOI: 10.1039/c5cp05168a

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  114. Communication-In Situ Formation of Anticorrosive Mg(OH)(2)/Carbon Composite Film on Magnesium Alloy by Ascorbic Acid-Assisted Hydrothermal Process Reviewed

    Takahiro Ishizaki, Naosumi Kamiyam, Erina Yamamoto, Sou Kumagai, Tomohito Sudare, Nagahiro Saito

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   Vol. 162 ( 14 ) page: C741 - C743   2015

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    An Mg(OH)(2)/carbon composite film was prepared on magnesium alloy AZ31 by an ascorbic acid (AA)-assisted hydrothermal method. All films were composed of crystalline brucite type Mg(OH)(2). Film thickness decreased with an increase in the amount of AA added. X-ray photoelectron spectroscopy studies revealed that a peak component related to sp(2)-hybridized carbons contributed to improve film conductivity. Film resistivity decreased with an increase in C content. The film obtained from the aqueous solution containing 10 g/L of AA showed the lowest corrosion current density of all samples. (C) 2015 The Electrochemical Society. All rights reserved.

    DOI: 10.1149/2.0351514jes

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  115. Water-plasma-assisted synthesis of black titania spheres with efficient visible-light photocatalytic activity Reviewed

    Gasidit Panomsuwan, Anyarat Watthanaphanit, Takahiro Ishizaki, Nagahiro Saito

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   Vol. 17 ( 21 ) page: 13794 - 13799   2015

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    Black titania spheres (H-TiO2-x) were synthesized via a simple green method assisted by water plasma at a low temperature and atmospheric pressure. The in situ production of highly energetic hydroxyl and hydrogen species from water plasma are the prominent factors in the oxidation and hydrogenation reactions during the formation of H-TiO2-x, respectively. The visible-light photocatalytic activity toward the dye degradation of H-TiO2-x can be attributed to the synergistic effect of large-surface area, visible-light absorption and the existence of oxygen vacancies and Ti3+ sites.

    DOI: 10.1039/c5cp00171d

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  116. Simple one-step synthesis of fluorine-doped carbon nanoparticles as potential alternative metal-free electrocatalysts for oxygen reduction reaction Reviewed

    Gasidit Panomsuwan, Nagahiro Saito, Takahiro Ishizaki

    JOURNAL OF MATERIALS CHEMISTRY A   Vol. 3 ( 18 ) page: 9972 - 9981   2015

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    Fluorine-doped carbon nanoparticles (FCNPs) were synthesized via a simple one-step solution plasma process for the first time. This synthesis strategy can be achieved at relatively low temperature and atmospheric pressure without the involvement of a metal catalyst. A mixture of toluene (C6H5CH3) and trifluorotoluene (C6H5CF3) was used as a precursor for the synthesis. The fluorine doping content can be varied from 0.95 to 4.52 at%, depending on the precursor mixing ratio. The structural analyses reveal that FCNPs mainly exhibit a disordered amorphous structure. The incorporation of fluorine atoms results in the creation of more defect sites and disordered structure in the carbon particles. The electrocatalytic activity toward the oxygen reduction reaction (ORR) of FCNPs in an alkaline solution shows a significant improvement with increasing fluorine doping content, as reflected in an increased limiting current density and a positively shifted onset potential. In association with X-ray photoelectron spectroscopy (XPS) analysis, an improved ORR activity is possibly attributed to the intercalation of ionic C-F and semi-ionic C-F bonds in the carbon structure. In addition, FCNPs possess excellent long-term operation durability and strong tolerance to methanol oxidation compared to those of a commercial Pt-based catalyst. Our results from this study not only confirm the applicability of the solution plasma process to the synthesis of FCNPs with a controllable fluorine doping level but also provide detailed information of FCNPs as potential alternative ORR catalysts for the electrocatalysis research.

    DOI: 10.1039/c5ta00244c

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  117. Nitrogen-doped carbon nanoparticles derived from acrylonitrile plasma for electrochemical oxygen reduction Reviewed

    Panomsuwan, G; Saito, N; Ishizaki, T

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   Vol. 17 ( 9 ) page: 6227-6232   2015

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    DOI: 10.1039/c4cp05995f

  118. In situ solution plasma synthesis of mesoporous nanocarbon-supported bimetallic nanoparticles Reviewed

    Jun Kang, Nagahiro Saito

    RSC ADVANCES   Vol. 5 ( 37 ) page: 29131 - 29134   2015

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    Herein, is reported a novel in situ one-step synthesis method of bimetallic nanoparticles (NPs) supported on carbon black, which can markedly prevent the aggregation and growth of NPs, resulting in a small particle size (average 5 nm), good dispersion, and high-electrocatalytic-activity.

    DOI: 10.1039/c5ra04220h

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  119. Highly durable silica coated Pt/Cs with different surfactant types for proton exchange membrane fuel cell applications Reviewed

    Wattanachai Yaowarat, Oi Lun Li, Nagahiro Saito

    RSC ADVANCES   Vol. 5 ( 55 ) page: 44258 - 44262   2015

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    Platinum supported on carbon Vulcan XC-72 (Pt/Cs) for application as a cathode in proton exchange membrane fuel cells (PEMFCs) was coated with silica layers by a sol-gel method with three types of surfactants with different charging properties. The three various types of surfactants (1) cationic surfactant (cetyltrimethylammonium bromide (CTAB)), (2) anionic surfactant (sodium dodecylbezenesulfonate (SDBS)), and (3) non-ionic surfactant (Pluronic 123 (P123)) were applied to prevent agglomeration of the Pt nanoparticles and prevent detachment of the Pt nanoparticles from the carbon supports during operation. The degree of improvement depended on the type of surfactant applied in the sol-gel method. The formation of silica layers by SDBS and P123 significantly improved the durability of the Pt/Cs catalysts under acid conditions. Silica coated Pt/Cs formed using SDBS and P123 showed improved durability after 500 cycles in a cyclic voltammetry test in 0.5 M sulfuric acid (H2SO4) by 27.3% and 22.7%, respectively.

    DOI: 10.1039/c5ra03343h

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  120. Enhancement of ORR catalytic activity by multiple heteroatom-doped carbon materials Reviewed

    Dae-Wook Kim, Oi Lun Li, Nagahiro Saito

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   Vol. 17 ( 1 ) page: 407 - 413   2015

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    Heteroatom-doped carbon matrices have been attracting significant attention due to their superior electrochemical stability, light weight and low cost. Hence, in this study, various types of heteroatom, including single dopants of N, B and P and multiple dopants of B-N and P-N with a carbon matrix were synthesized by an innovative method named the solution plasma process. The heteroatom was doped into the carbon matrix during the discharge process by continuous dissociation and recombination of precursors. The chemical bonding structure, ORR activity and electrochemical performance were compared in detail for each single dopant and multiple dopants. According to the Raman spectra, the carbon structures were deformed by the doped heteroatoms in the carbon matrix. In comparison with N-doped structures (NCNS), the ORR potential of PN-doped structures (PNCNS) was positively shifted from -0.27 V to -0.24 V. It was observed that doping with N decreased the bonding between P and C in the matrix. The multiple doping induced additional active sites for ORR which further enhanced ORR activity and stability. Therefore, PNCNS is a promising metal-free catalyst for ORR at the cathode in a fuel cell.

    DOI: 10.1039/c4cp03868a

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  121. Cellulose conversion to sugar alcohol by solution plasma processing

    Watthanaphanit A.

    Materials Research Society Symposium Proceedings   Vol. 1745   page: 22 - 27   2015

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    DOI: 10.1557/opl.2015.787

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  122. Direct deposition of gold nanoparticles on cellulose fiber by solution plasma process

    Nemoto S.

    Materials Research Society Symposium Proceedings   Vol. 1723   page: 1 - 7   2015

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    DOI: 10.1557/opl.2015.13

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  123. From Cyano-aromatic Molecules to Nitrogen-doped Carbons by Solution Plasma for the Oxygen Reduction Reaction in Alkaline Medium

    Panomsuwan G.

    Materials Today: Proceedings   Vol. 2 ( 8 ) page: 4302 - 4308   2015

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    DOI: 10.1016/j.matpr.2015.09.017

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  124. Cellulose conversion to sugar alcohol by solution plasma processing

    Watthanaphanit A.

    Materials Research Society Symposium Proceedings   Vol. 1745   page: 22 - 27   2015

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    DOI: 10.1557/opl.2015.787

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  125. Direct deposition of gold nanoparticles on cellulose fiber by solution plasma process

    Nemoto S.

    Materials Research Society Symposium Proceedings   Vol. 1723   page: 1 - 7   2015

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    DOI: 10.1557/opl.2015.13

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  126. From Cyano-aromatic Molecules to Nitrogen-doped Carbons by Solution Plasma for the Oxygen Reduction Reaction in Alkaline Medium

    Panomsuwan G.

    Materials Today: Proceedings   Vol. 2 ( 8 ) page: 4302 - 4308   2015

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    DOI: 10.1016/j.matpr.2015.09.017

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  127. PHENIX Collaboration

    Adare A.

    Nuclear Physics A   Vol. 932   page: 627 - 633   2014.12

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    DOI: 10.1016/S0375-9474(14)00604-6

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  128. PHENIX Collaboration

    Adare A.

    Nuclear Physics A   Vol. 932   page: 627 - 633   2014.12

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    DOI: 10.1016/S0375-9474(14)00604-6

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  129. 新しい液中反応場 : ソリューションプラズマ (特集 機能性マテリアルズとコンバーティング) Reviewed

    上野 智永, 齋藤 永宏

    コンバーテック   Vol. 42 ( 12 ) page: 78-81   2014.12

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    CiNii Article

  130. A Study on Electron Impact Dissociative Ionization of Organosilicon Precursors for Plasma Processing Reviewed

    Yongsup Yun, Myeonghoon Lee, Yasushi Inoue, Nagahiro Saito, Osamu Takai

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   Vol. 14 ( 12 ) page: 9653 - 9656   2014.12

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    We discussed the electron impact dissociation behavior of the organosilicon molecules with methyl groups, based on the fragment pattern and molecular-orbital calculation of the bond dissociation energies for the molecules. From the calculation of bond dissociation energy of the organosilicon molecules, methyl groups, which bonded directly to the silicon atom, were found to have the weakest. Regarding the fragment patterns of the reactants investigated by a quadrupole mass spectrometer, the hexamethyldisiloxane was harder to dissociate than the trimethylmethoxysilane due to the strong Si-O bonding force, which also affected the dissociation in the plasma. From the above considerations, dissociation reactions by electron impact could be partly identified.

    DOI: 10.1166/jnn.2014.10175

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  131. One-step facile synthesis of Pd nanoclusters supported on carbon and their electrochemical property Reviewed

    Junjun Shi, Xiulan Hu, Jianbo Zhang, Weiping Tang, Hongtao Li, Xiaodong Shen, Nagahiro Saito

    PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL   Vol. 24 ( 6 ) page: 593 - 598   2014.12

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    Well-crystallized Pd nanoclusters supported on Ketjen Black (KB) were successfully fabricated when Pd wires were served as an electrode pair by a solution plasma technique at atmospheric pressure. The synthesis of Pd nanoclusters was almost simultaneous with their dispersion on KB. Pd nanoclusters with the average diameter of about 2 urn were equably distributed on KB, and showed good electrochemical property corresponding to their obvious characteristic peaks. Multi-scan cyclic voltammetry and chronoamperometry clarified that as-prepared Pd nanoclusters have better electrochemical stability in alkaline solution than that of in acidic solution. Thus as-obtained Pd nanoclusters would become a promising electrocatalyst for fuel cells or Li-air batteries. (C) 2014 Chinese Materials Research Society. Production and hosting by Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.pnsc.2014.10.011

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  132. Effect of growth temperature on structural and morphological evolution of epitaxial SrTiO3 thin films grown on LaAlO3 (001) substrates by ion beam sputter deposition Reviewed

    Gasidit Panomsuwan, Osamu Takai, Nagahiro Saito

    VACUUM   Vol. 109   page: 175 - 179   2014.11

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    A series of epitaxial SrTiO3 (STO) thin films were grown on (001)-oriented LaAlO3 (LAO) substrates by ion beam sputter deposition (IBSD) at various growth temperatures in the range of 350-800 degrees C. Our results have shown that the growth temperature plays an essential role in influencing the structural and morphological evolution of the STO thin films. X-ray structural analysis demonstrates that the STO thin films are grown under in-plane compressive strain due to the effect of lattice mismatch. The out-of-plane lattice constant is found to decrease with increasing growth temperature. Atomic force microscopy observation reveals that the growth mode of STO thin films transforms from a three-dimensional island mode to a two-dimensional layer-by-layer mode at a sufficiently high growth temperature of 750 degrees C. We believe that high-quality epitaxial STO thin films with atomically flat surface prepared by IBSD in this study would be beneficial for the fabrication of perovskite STO-based superlattices. (C) 2014 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.vacuum.2014.07.007

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  133. Influence of the discharge time of solution plasma process on the formation of gold nanoparticles in alginate matrix Reviewed

    Anyarat Watthanaphanit, Yong Kang Heo, Nagahiro Saito

    JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS   Vol. 45 ( 6 ) page: 3099 - 3103   2014.11

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    Gold nanoparticles (AuNPs) stabilized in alginate matrix were synthesized by applying the plasma into alginate aqueous solution containing gold(III) chloride trihydrate precursor. Effect of the solution plasma process (SPP) discharge time on the physical properties, including shape and size, and the optical absorption properties of the synthesized AuNPs were investigated by varying the discharge times to be 0, 5, 10, 20 and 30 min. Results reveal that the increase in the discharge time leads to a size reduction of the AuNPs. Also, the particles tend to be more spherical. Appearance of the obtained AuNPs-alginate suspensions along with the change in their UV-vis absorption spectra intensity after samples were left standing for several time intervals suggest that alginate solution itself can act both as a stabilizer and a reducing agent for the AuNPs formation while the application of plasma helps to improve the controllability of shape and size of the synthesized particles. Furthermore, the method is simple, reproducible, and does not need any manipulative skill. Since the reducing agent is not required, the method is suitable for utilizing in biomedical application. (C) 2014 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jtice.2014.09.001

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  134. Hierarchical meso-macro structure porous carbon black as electrode materials in Li-air battery Reviewed

    Jun Kang, Oi Lun Li, Nagahiro Saito

    JOURNAL OF POWER SOURCES   Vol. 261   page: 156 - 161   2014.9

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    A new class of hierarchical structure porous carbon black, carbon nanoballs (CNBs), was generated by solution plasma process (SPP) with benzene. The structural characterization revealed that CNBs have excellent meso macro hierarchical pore structure, with an averaged diameter size of 14.5 nm and a total pore volume of 1.13 cm(3) g(-1). The CNBs are aggregated forming inter-connected pore channels in different directions on both the meso- and macrometer length scales. The discharge capacity of CNBs reached 3600 mAh g(-1), which exceeded the capacity of Ketjen Black EC-600JD (a commercial carbon black with highest cell performance) by 30-40%. The excellent discharge capacity was contributed by the coexistence of high pore volume and meso macro hierarchical porous structure. This new class carbon material exhibited higher discharge capacity compared to commercial porous carbon materials, and is possible to apply as the next generation of electrode materials in lithium-air (Li-air) battery. The structural and electrochemical properties accompanied with the synthesis mechanism of CNBs were discussed in details. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jpowsour.2014.03.072

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  135. Hierarchical Meso-Macro Structure Porous Carbon Black as Electrode Materials in Li-Air Battery Reviewed

    Jun Kang, Oi Lun Li, Nagahiro Saito

    Journal of Power Source   Vol. 261   page: 156-161   2014.9

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  136. Plasma-Induced Synthesis of CuO Nanofibers and ZnO Nanoflowers in Water Reviewed

    Xiulan Hu, Xin Zhang, Xiaodong Shen, Hongtao Li, Osamu Takai, Nagahiro Saito

    PLASMA CHEMISTRY AND PLASMA PROCESSING   Vol. 34 ( 5 ) page: 1129 - 1139   2014.9

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    Fiber-shaped cupric oxide (CuO) nanoparticles and flower-shaped ZnO nanoparticles were facilely synthesized by plasma-induced technique directly from copper and zinc electrode pair in water, respectively. The phase composition, morphologies and optical property of nanoparticles have been investigated by energy dispersive X-ray analysis, X-ray powder diffraction, transmission electron microscopy and UV-vis. The in situ analysis by an optical emission spectroscopy clarified the formation mechanism. Plasma was generated from the discharge between a metal electrode pair in water by a pulse direct current power. CuO and ZnO nanoparticles were synthesized via almost the same formation mechanism, which were prepared via the rapid energetic radicals' bombardment to electrodes' surface, atom vapour diffusion, plasma expansion, solution medium condensation, and in situ oxygen reaction and further growth. This novel plasma-induced technique will become a potential application in nanomaterials synthesis.

    DOI: 10.1007/s11090-014-9546-0

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  137. Hierarchical Meso-Macro Structure Porous Carbon Black as Electrode Materials in Li-Air Battery Reviewed

    Jun Kang, Oi Lun Li, Nagahiro Saito

    Journal of Power Source   Vol. 261   page: 156-161   2014.9

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  138. Hierarchical Meso-Macro Structure Porous Carbon Black as Electrode Materials in Li-Air Battery Reviewed

    Jun Kang, Oi Lun Li, Nagahiro Saito

    Journal of Power Source   Vol. 261   page: 156-161   2014.9

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  139. Controlled crystalline orientation of SrTiO3 thin films grown on Pt(111)/Ti/alpha-Al2O3(0001) substrates: Effect of growth temperature and Ti layer thickness Reviewed

    Gasidit Panomsuwan, Osamu Takai, Nagahiro Saito

    APPLIED SURFACE SCIENCE   Vol. 309   page: 95 - 105   2014.8

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    SrTiO3 (STO) thin films were grown on Pt(1 1 1)/Ti/alpha-Al2O3(0 0 0 1) substrates by ion beam sputter deposition. Growth temperature was varied between 600 and 750 degrees C, while Ti layer thickness was adjusted from 3 to 36 nm. Experimental results demonstrate that both the crystalline orientation and surface morphology are significantly dependent on change in the growth temperature and Ti layer thickness. From X-ray structural analysis, the STO thin films grown at 600 degrees C are perfectly (1 1 0)-oriented in spite of the change in Ti layer thickness. The STO thin films with a perfect (1 1 1) orientation are achievable at a sufficiently high growth temperature (&gt;= 700 degrees C) and a thin Ti layer (3-6 nm). Each crystalline orientation of STO thin films has a specific in-plane orientation relationship with respect to the Pt(1 1 1) layer. Flat-, rod-, and triangle-shaped grains are clearly observed from atomic force microscopy investigation, which are associated with the (1 1 0)-, (1 0 0)-, and (1 1 1)-oriented grains, respectively. Their grain orientations also show a good correlation with the X-ray structural analysis. The growth mechanism of each crystalline orientation can be described in term of surface diffusion, surface energy anisotropy, electrostatic, and role of TiOx seeds. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.apsusc.2014.04.186

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  140. X-ray analysis of strain distribution in two-step grown epitaxial SrTiO3 thin films Reviewed

    Gasidit Panomsuwan, Osamu Takai, Nagahiro Saito

    APPLIED PHYSICS LETTERS   Vol. 105 ( 5 ) page: 51911   2014.8

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    Epitaxial SrTiO3 (STO) thin films were grown on (001)-oriented LaAlO3 (LAO) substrates using a two-step growth method by ion beam sputter deposition. An STO buffer layer was initially grown on the LAO substrate at a low temperature of 150 degrees C prior to growing the STO main layer at 750 degrees C. The thickness of the STO buffer layer was varied at 3, 6, and 10 nm, while the total film thickness was kept constant at approximately 110 nm. According to x-ray structural analysis, we show that the STO buffer layer plays an essential role in controlling the strain in the STO layer grown subsequently. It is found that the strains in the STO films are more relaxed with an increase in buffer layer thickness. Moreover, the strain distribution in two-step grown STO films becomes more homogeneous across the film thickness when compared to that in directly grown STO film. (C) 2014 AIP Publishing LLC.

    DOI: 10.1063/1.4892827

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  141. Synthesis of mono-dispersed nanofluids using solution plasma Reviewed

    Heo Yong Kang, Bratescu Maria Antoaneta, Ueno Tomonaga, Saito Nagahiro

    JOURNAL OF APPLIED PHYSICS   Vol. 116 ( 2 )   2014.7

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    DOI: 10.1063/1.4887806

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  142. Synthesis of meso-dispersed nanofluids using solution plasma Reviewed

    Y. K. Heo, M. A. Bratescu, T. Ueno, N. Saito

    Journal of Applied Physyics   Vol. 116 ( 2 ) page: 024302   2014.7

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  143. Synthesis of meso-dispersed nanofluids using solution plasma Reviewed

    Y. K. Heo, M. A. Bratescu, T. Ueno, N. Saito

    Journal of Applied Physyics   Vol. 116 ( 2 ) page: 024302   2014.7

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  144. Synthesis of meso-dispersed nanofluids using solution plasma Reviewed

    Y. K. Heo, M. A. Bratescu, T. Ueno, N. Saito

    Journal of Applied Physyics   Vol. 116 ( 2 ) page: 024302   2014.7

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  145. The role of the central Fe atom in the N4-macrocyclic structure for the enhancement of oxygen reduction reaction in a heteroatom nitrogen-carbon nanosphere Reviewed

    D. W. Kim, O. L. Li, N. Saito

    Physical Chemistry Chemical Physics   Vol. 16   page: 14905-14911   2014.6

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  146. The role of the central Fe atom in the N4-macrocyclic structure for the enhancement of oxygen reduction reaction in a heteroatom nitrogen-carbon nanosphere Reviewed

    D. W. Kim, O. L. Li, N. Saito

    Physical Chemistry Chemical Physics   Vol. 16   page: 14905-14911   2014.6

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  147. The role of the central Fe atom in the N4-macrocyclic structure for the enhancement of oxygen reduction reaction in a heteroatom nitrogen-carbon nanosphere Reviewed

    D. W. Kim, O. L. Li, N. Saito

    Physical Chemistry Chemical Physics   Vol. 16   page: 14905-14911   2014.6

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  148. Controlled crystalline orientation of SrTiO3 thin films grown on Pt(1 1 1)/Ti/α-Al2O3(0 0 0 1) substrates: Effect of growth temperature and Ti layer thickness Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Applied Surface Science   Vol. 309 ( 1 ) page: 95-105   2014.5

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  149. Controlled crystalline orientation of SrTiO3 thin films grown on Pt(1 1 1)/Ti/α-Al2O3(0 0 0 1) substrates: Effect of growth temperature and Ti layer thickness Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Applied Surface Science   Vol. 309 ( 1 ) page: 95-105   2014.5

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  150. Controlled crystalline orientation of SrTiO3 thin films grown on Pt(1 1 1)/Ti/α-Al2O3(0 0 0 1) substrates: Effect of growth temperature and Ti layer thickness Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Applied Surface Science   Vol. 309 ( 1 ) page: 95-105   2014.5

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  151. Growth of Highly (100)-Oriented SrTiO3 Thin Films on Si(111) Substrates Without Buffer Layer Reviewed

    Gasidit Panomsuwan, Osamu Takai, Nagahiro Saito

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   Vol. 97 ( 5 ) page: 1383 - 1385   2014.5

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    The SrTiO3 (STO) thin films were directly grown on Si(111) substrates without buffer layer by an electron-cyclotron-resonance ion beam sputter deposition. The growth temperature was varied from 700 degrees C to 850 degrees C, while other parameters were kept unchanged. X-ray structural analysis demonstrates that the growth temperature has a strong influence in tuning degree of (100) orientation. The STO film grown at 800 degrees C is found to be the highest degree of (100) orientation (98%) and a strong (100) fiber texture. For the surface morphology, the development of plate-shaped grains reveals a good correlation with the change in the degree of (100) orientation. Moreover, the leakage current-voltage characteristics of the Au/STO/Si(111) metal-insulator-semiconductor capacitors are investigated and discussed in considerable detail.

    DOI: 10.1111/jace.12912

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  152. Electrochemical Reduction of Carbon Dioxide by FTO/Nafion/CNT/CoPc 3D Catalytic Electrode

    FUJISHIMA Tamaki, ICHIKAWA Yukiko, SAITO Nagahiro, UENO Tomohiro, YOSHIDA Tsukasa

    IEICE technical report. Electron devices   Vol. 114 ( 12 ) page: 65-67 - 67   2014.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Institute of Electronics, Information and Communication Engineers  

    Photovoltaic technology is becoming a major source of electric power as the annual production of solar panels is exceeding 40GW/yr. Large scale use of renewable energy will soon face a problem of excessive production of electric power because of its fluctuation on weather. It is ideal if we could utilize such excess electricity to convert carbon dioxide (CO_2) to chemical energy which is safe, high in energy density and easy to store, rather than aiming direct conversion of sun light to chemical energy as represented in studies on artificial photosynthesis.

    CiNii Article

  153. A New Approach of Non-Point Source Pollution/ Storwmater Sludge Treatment by Thermal Plasma Systems Reviewed

    O. L. Li, Y. Guo, J. S. Chang, K. Urashima, N. Saito

    International Journal of Environmental Science and Technology     page: 1-10   2014.4

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  154. A phonon thermodynamics approach of gold nanofluids synthesized in solution plasma (vol 104, 111902, 2014) Reviewed

    YongKang Heo, Maria Antoaneta Bratescu, Daiki Aburaya, Nagahiro Saito

    APPLIED PHYSICS LETTERS   Vol. 104 ( 14 ) page: 149901   2014.4

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    DOI: 10.1063/1.4870525

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  155. Solution plasma synthesis process of tungsten carbide on N-doped carbon nanocomposite with enhanced catalytic ORR activity and durability Reviewed

    D. Kim, O. L. Li, P. Pootawang, N. Saito

    RSC Advances   Vol. 4 ( 32 ) page: 16813-16819   2014.3

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  156. Solution plasma synthesis process of tungsten carbide on N-doped carbon nanocomposite with enhanced catalytic ORR activity and durability Reviewed

    D. Kim, O. L. Li, P. Pootawang, N. Saito

    RSC Advances   Vol. 4 ( 32 ) page: 16813-16819   2014.3

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  157. Solution plasma synthesis process of tungsten carbide on N-doped carbon nanocomposite with enhanced catalytic ORR activity and durability Reviewed

    D. Kim, O. L. Li, P. Pootawang, N. Saito

    RSC Advances   Vol. 4 ( 32 ) page: 16813-16819   2014.3

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  158. A phonon thermodynamics approach of gold nanofluids synthesized in solution plasma Reviewed

    YongKang Heo, Maria Antoaneta Bratescu, Daiki Aburaya, Nagahiro Saito

    APPLIED PHYSICS LETTERS   Vol. 104 ( 11 ) page: 111902   2014.3

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    The phonon thermodynamics theory for liquids was applied to explain the thermal characteristics of gold nanofluids synthesized by a simple, one-step, and chemical-free method using an electrical discharge in a liquid environment termed solution plasma process. The specific heat capacity of nanofluids was measured with a differential scanning calorimeter using the ratio between the differential heat flow rate and the heating rate. The decrease of the specific heat capacity with 10% of gold nanofluids relative to water was explained by the decrease of Frenkel relaxation time with 22%, considering a solid-like state model of liquids. (C) 2014 AIP Publishing LLC.

    DOI: 10.1063/1.4868872

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  159. Growth of Highly (100)-Oriented SrTiO3 Thin Films on Si (111) Substrates Without Buffer Layer Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Journal of the American Ceramic Society   Vol. 97 ( 5 ) page: 1383-1385   2014.2

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  160. Growth of Highly (100)-Oriented SrTiO3 Thin Films on Si (111) Substrates Without Buffer Layer Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Journal of the American Ceramic Society   Vol. 97 ( 5 ) page: 1383-1385   2014.2

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  161. Growth of Highly (100)-Oriented SrTiO3 Thin Films on Si (111) Substrates Without Buffer Layer Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Journal of the American Ceramic Society   Vol. 97 ( 5 ) page: 1383-1385   2014.2

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  162. Depolymerization of chitosan metal complexes via a solution plasma technique Reviewed

    Orathai Pornsunthorntawee, haiyapruk Katepetch, Chutima Vanichvattanadecha, Nagahiro Saito, Ratana Rujiravanit

    Carbohydrate Polymers   Vol. 102   page: 504-512   2014.2

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  163. Depolymerization of chitosan-metal complexes via a solution plasma technique Reviewed

    Pornsunthorntawee, O; Katepetch, C; Vanichvattanadecha, C; Saito, N; Rujiravanit, R

    CARBOHYDRATE POLYMERS   Vol. 102   page: 504-512   2014.2

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    DOI: 10.1016/j.carbpol.2013.11.025

  164. Depolymerization of chitosan metal complexes via a solution plasma technique Reviewed

    Orathai Pornsunthorntawee, haiyapruk Katepetch, Chutima Vanichvattanadecha, Nagahiro Saito, Ratana Rujiravanit

    Carbohydrate Polymers   Vol. 102   page: 504-512   2014.2

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  165. Depolymerization of chitosan metal complexes via a solution plasma technique Reviewed

    Orathai Pornsunthorntawee, haiyapruk Katepetch, Chutima Vanichvattanadecha, Nagahiro Saito, Ratana Rujiravanit

    Carbohydrate Polymers   Vol. 102   page: 504-512   2014.2

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  166. A phonon thermodynamics approach of gold nanofluids synthesized in solution plasma Reviewed

    YongKang Heo, Maria Antoaneta Bratescu, Daiki Aburaya, Nagahiro Saito

    Applied Physics Letters   Vol. 104   page: 111902   2014.2

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  167. A phonon thermodynamics approach of gold nanofluids synthesized in solution plasma Reviewed

    YongKang Heo, Maria Antoaneta Bratescu, Daiki Aburaya, Nagahiro Saito

    Applied Physics Letters   Vol. 104   page: 111902   2014.2

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  168. A phonon thermodynamics approach of gold nanofluids synthesized in solution plasma Reviewed

    YongKang Heo, Maria Antoaneta Bratescu, Daiki Aburaya, Nagahiro Saito

    Applied Physics Letters   Vol. 104   page: 111902   2014.2

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  169. 冷たい液中プラズマ反応場が拓く新しいナノ材料合成

    上野智永,齋藤永宏

    工業材料   Vol. 62 ( 1 ) page: 52-53   2014.1

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  170. 冷たい液中プラズマ反応場が拓く新しいナノ材料合成

    上野智永, 齋藤永宏

    工業材料   Vol. 62 ( 1 ) page: 52-53   2014.1

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  171. 冷たい液中プラズマ反応場が拓く新しいナノ材料合成

    上野智永, 齋藤永宏

    工業材料   Vol. 62 ( 1 ) page: 52-53   2014.1

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  172. Biomimetic superhydrophobic surface fabrication by plasma processing

    Watthanaphanit A.

    Biomimetic Architectures by Plasma Processing: Fabrication and Applications     page: 151 - 180   2014.1

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  173. Solution Plasma for Molecular Technologies Reviewed

      Vol. 51 ( 4 ) page: 142-145   2014

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    CiNii Article

  174. Synthesis of mono-dispersed nanofluids using solution plasma Reviewed

    Heo Y. K, Bratescu M. A, Ueno T, Saito N.

    Journal of Applied Physics   Vol. 116 ( 2 ) page: -   2014

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    DOI: 10.1063/1.4887806

  175. A novel one-step synthesis of gold nanoparticles in an alginate gel matrix by solution plasma sputtering Reviewed

    Anyarat Watthanaphanit, Gasidit Panomsuwan, Nagahiro Saito

    RSC Advances   Vol. 4   page: 1622-1629   2014

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  176. The role of the central Fe atom in the N-4-macrocyclic structure for the enhancement of oxygen reduction reaction in a heteroatom nitrogen-carbon nanosphere Reviewed

    Dae-wook Kim, Oi Lun Li, Nagahiro Saito

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   Vol. 16 ( 28 ) page: 14905 - 14911   2014

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    In the present work, we demonstrated the significance of a central transition metal, Fe, in a N-4-macrocycle for the enhancement of ORR activity and other electrochemical properties. The catalysts were synthesized by a solution plasma process. Fe-phthalocyanine/benzene and phthalocyanine/benzene were chosen as the precursors of Fe-phthalocyanine based mesoporous carbon (FP-MCS) and phthalocyanine based mesoporous carbon (P-MCS) catalysts, respectively. The existence of Fe-N-4 and N-4 macrocyclic structures was confirmed by X-ray photoelectron spectroscopy. From the chemical bonding structure, FP-MCS demonstrated that the Me-N peaks increased as the amount of iron-phthalocyanine introduced in the experiment increased. The dominant active site was shifted from pyridinic nitrogen to Me-N when iron-phthalocyanine was present. The analysis of Tof-SIMS indicated that the relative intensity of FeN4Cy+ ions was approximately 50% of the total amount of ionized species of Sigma FeNxCy+. Both XPS and Tof-SIMS results confirmed that the Fe-N-4 site was the most favourable structure in the matrix. From CV measurements, the cathodic peak current corresponding to ORR activity slightly shifted from -0.19 V to -0.17 V when the active site changed from N-4 to Fe-N-4 macrocyclic structure. The current density increased more than 30% in the presence of iron. Based on the calculation of Koutecky-Levich plots, the electron transfer numbers for ORR reaction in P- and FP-MCSs were 3.25 and 3.98, respectively. These results clearly demonstrated that the presence of a Fe central ion in the N-4-acrocyclic structure significantly enhanced the ORR and charge transfer number in ORR activities.

    DOI: 10.1039/c4cp01406e

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  177. Solution plasma synthesis process of tungsten carbide on N-doped carbon nanocomposite with enhanced catalytic ORR activity and durability Reviewed

    Dae-Wook Kim, Oi Lun Li, Panuphong Pootawang, Nagahiro Saito

    RSC ADVANCES   Vol. 4 ( 32 ) page: 16813 - 16819   2014

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    In this study, the enhancement of ORR activity and durability by an N-doped carbon nanocomposite on tungsten carbide (WC) nanoparticles was reported. The nanocomposite of tungsten carbide on two different carbon matrices, pure carbon matrix (WC/C) and N-doped carbon matrix (WC/N-C), was at first prepared by a simple discharge process in the mixture of benzene/dodecane and pyrrole/dodecane. The nanoparticles of tungsten carbide were formed via the sputtering effect of tungsten electrodes during discharge. The results of TEM and XRD demonstrated that tungsten carbide nanoparticles with a mean size of 6 nm were evenly dispersed on both carbon matrices. The results of cyclic voltammetry measurements showed that both obtained metal/carbon matrices promoted a significant oxygen reduction reaction (ORR) in alkaline solution. The ORR potential of tungsten carbide/carbon matrix and nitrogen-doped carbon were -0.29 V and -0.36 V, respectively. The enhancement of ORR activity in WC/N-C was attributed to the combined catalytic effects of WC and N in the carbon matrix. Although the ORR activity of WC/N-C was still incomparable with commercial Pt/C, the durability of the catalyst was significant higher than that of Pt/C in a methanol environment. The catalyst did not exhibit an evident change of initial current after 4000 s. Therefore, the inexpensive N-doped WC/C nanocomposite might be a promising and highly durable catalytic material for cathodes in fuel cell applications.

    DOI: 10.1039/c4ra02380c

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  178. Solution plasma exfoliation of graphene flakes from graphite electrodes Reviewed

    Hoonseung Lee, Maria Antoaneta Bratescu, Tomonaga Ueno, Nagahiro Saito

    RSC ADVANCES   Vol. 4 ( 93 ) page: 51758 - 51765   2014

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    Graphene flakes were successfully produced by a simple method named a solution plasma process. The plasma was generated between two carbon electrode tips which were immersed in distilled water. The production approach is a continuous energy accumulation induced by focusing of plasma streamers on the surface of electrodes. This focused energy produces thermal gradient zones where a proper energy level is produced. Concisely, the energy is enough to extract graphene layers from the graphite structure but not enough to break covalent C-C bonds within the graphene sheets. Optical emission spectroscopy results showed the decomposition of carbon from the graphite electrodes with different intensities for the carbon species. Transmission electron microscopy images confirmed the hexagonal honeycomb structure of the graphene flakes. Furthermore, broadening of the 2D band in the Raman spectra revealed that the graphene flakes were disordered multilayers.

    DOI: 10.1039/c4ra03253e

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  179. In situ solution plasma synthesis of nitrogen-doped carbon nanoparticles as metal-free electrocatalysts for the oxygen reduction reaction Reviewed

    Panomsuwan, G, Chiba, S, Kaneko, Y, Saito, N, Ishizaki, T

    JOURNAL OF MATERIALS CHEMISTRY A   Vol. 2 ( 43 ) page: 18677-18686 - 18686   2014

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    DOI: 10.1039/c4ta03010a

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  180. A novel one-step synthesis of gold nanoparticles in an alginate gel matrix by solution plasma sputtering Reviewed

    Anyarat Watthanaphanit, Gasidit Panomsuwan, Nagahiro Saito

    RSC ADVANCES   Vol. 4 ( 4 ) page: 1622 - 1629   2014

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    We report a novel strategy to produce stable colloidal gold nanoparticles (AuNPs) in alginate aqueous solution which can be done in one step and without any chemicals. The AuNPs were produced by applying a voltage across a pair of gold electrodes which were immersed in alginate aqueous solution. Since the generation of AuNPs was caused by the sputtering of gold electrodes, the process was named the solution plasma sputtering (SPS) process. We utilize the alginate polymer in order to meet three important requirements: (1) to promote the generation of plasma in a liquid environment, (2) to endow biocompatibility to the AuNPs, and (3) to provide colloidal stability to the AuNPs-alginate aqueous suspensions. The alginate concentrations were varied as 0.2, 0.5, and 0.9 %w/v. The concentration-dependent effect on the particle size of AuNPs, the physical absorption property and the stability of the AuNPs-alginate suspensions were studied. Results indicate that preparation of chemical-free colloidal AuNPs-alginate aqueous suspension is successful by the SPS process. The obtained colloidal suspensions were stable and able to retain their strong plasmon absorption bands within a reasonable time period. As a consequence, this is a high-potential technique to produce AuNPs suspended in alginate aqueous solution appropriate for biomedical applications.

    DOI: 10.1039/c3ra45029e

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  181. Solution plasma synthesis of nitrogen-doped carbon nanoballs as effective metal-free electrocatalysts for oxygen reduction reaction

    Panomsuwan G.

    Materials Research Society Symposium Proceedings   Vol. 1641   2014

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    DOI: 10.1557/opl.2014.319

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  182. ソリューションプラズマとカーボン触媒

    齋藤 永宏

    応用物理   Vol. 83 ( 6 ) page: 486 - 487   2014

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    DOI: 10.11470/oubutsu.83.6_486

    CiNii Article

  183. Solution plasma synthesis of nitrogen-doped carbon nanoballs as effective metal-free electrocatalysts for oxygen reduction reaction

    Panomsuwan G.

    Materials Research Society Symposium Proceedings   Vol. 1641   2014

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    DOI: 10.1557/opl.2014.319

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  184. ソリューションプラズマとカーボン触媒

    齋藤 永宏

    応用物理   Vol. 83 ( 6 ) page: 486 - 487   2014

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    Publishing type:Research paper (scientific journal)   Publisher:公益社団法人 応用物理学会  

    DOI: 10.11470/oubutsu.83.6_486

    CiNii Article

  185. Charge doping of large-area graphene by gold-alloy nanoparticles Reviewed

    Maria Antoaneta Bratescu, Nagahiro Saito

    Journal of Physical Chemistry C   Vol. 117 ( 50 ) page: 26804 - 26810   2013.12

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    We present a facile, one-step, and surfactant-free method for direct synthesis and loading of stable gold and gold-alloy nanoparticles (NPs) on large-area graphene using an electrical discharge in a liquid environment, termed solution plasma. We observed a charge doping of graphene by the gold NPs, which depends on the particles' chemical composition, even if the NPs contain a few percent of trivalent sp metals, such as indium (In) or gallium (Ga). Raman and electron energy loss spectroscopy (EELS) methods show that graphene is doped with electrons (n-type) in the case of gold NPs and with holes (p-type) in the case of gold-alloy NPs. The Raman band shift indicates that the amount of the transferred electrons from the gold NPs to graphene is -2 × 10 -4 electrons per unit cell. The gold-alloy NPs receive from graphene (2 and 4) × 10-5 electrons per unit cell if the gold NPs contain In and Ga, respectively. In the EELS spectra, the decrease in the intensity of the 1s-π* transition and the shift of the π* peak to higher energy confirm the depopulation of the antibonding states caused by the electron transfer from graphene to the gold-alloy NPs. © 2013 American Chemical Society.

    DOI: 10.1021/jp409368c

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  186. Gold Nanoparticle Synthesis Using Three-Dimensionally Integrated Micro-Solution Plasmas Reviewed

    Tatsuru Shirafuji, Jun Ueda, Akihiro Nakamura, Sung-Pyo Cho, Nagahiro Saito, Osamu Takai

    Japanese Journal of Applied Physics   Vol. 52   page: 126202   2013.12

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  187. Gold Nanoparticle Synthesis Using Three-Dimensionally Integrated Micro-Solution Plasmas Reviewed

    Tatsuru Shirafuji, Jun Ueda, Akihiro Nakamura, Sung-Pyo Cho, Nagahiro Saito, Osamu Takai

    Japanese Journal of Applied Physics   Vol. 52   page: 126202   2013.12

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  188. Gold Nanoparticle Synthesis Using Three-Dimensionally Integrated Micro-Solution Plasmas Reviewed

    Tatsuru Shirafuji, Jun Ueda, Akihiro Nakamura, Sung-Pyo Cho, Nagahiro Saito, Osamu Takai

    Japanese Journal of Applied Physics   Vol. 52   page: 126202   2013.12

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  189. Charge Doping of Large-Area Graphene by Gold-Alloy Nanoparticles Reviewed

    M. A. Bratescu, N. Saito

    The Journal of Physical Chemistry C   Vol. 117   page: 26804-26810   2013.11

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  190. Charge Doping of Large-Area Graphene by Gold-Alloy Nanoparticles Reviewed

    M. A. Bratescu, N. Saito

    The Journal of Physical Chemistry C   Vol. 117   page: 26804-26810   2013.11

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  191. Charge Doping of Large-Area Graphene by Gold-Alloy Nanoparticles Reviewed

    M. A. Bratescu, N. Saito

    The Journal of Physical Chemistry C   Vol. 117   page: 26804-26810   2013.11

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  192. Functionalization of Multiwalled Carbon Nanotubes by Solution Plasma Processing in Ammonia Aqueous Solution and Preparation of Composite Material with Polyamide 6 Reviewed

    Tatsuru Shirafuji, Yohei Noguchi, Taibou Yamamoto, Junko Hieda, Nagahiro Saito, Osamu Takai, Akiharu Tsuchimoto, Kazuhiro Nojima, Youji Okabe

    Japanese Journal of Applied Phisics   Vol. 52 ( 12R ) page: 125101   2013.11

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  193. Functionalization of Multiwalled Carbon Nanotubes by Solution Plasma Processing in Ammonia Aqueous Solution and Preparation of Composite Material with Polyamide 6 Reviewed

    Tatsuru Shirafuji, Yohei Noguchi, Taibou Yamamoto, Junko Hieda, Nagahiro Saito, Osamu Takai, Akiharu Tsuchimoto, Kazuhiro Nojima, Youji Okabe

    Japanese Journal of Applied Phisics   Vol. 52 ( 12R ) page: 125101   2013.11

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  194. Functionalization of Multiwalled Carbon Nanotubes by Solution Plasma Processing in Ammonia Aqueous Solution and Preparation of Composite Material with Polyamide 6 Reviewed

    Tatsuru Shirafuji, Yohei Noguchi, Taibou Yamamoto, Junko Hieda, Nagahiro Saito, Osamu Takai, Akiharu Tsuchimoto, Kazuhiro Nojima, Youji Okabe

    Japanese Journal of Applied Phisics   Vol. 52 ( 12R ) page: 125101   2013.11

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  195. Epitaxial growth of (111)-oriented BaTiO3/SrTiO3 perovskite superlattices on Pt(111)/Ti/Al2O3(0001) substrates Reviewed

    Gasidit Panomsuwan, Osamu Takai, Nagahiro Saito

    Applied Physics Letters   Vol. 103   page: 112902   2013.11

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  196. Epitaxial growth of (111)-oriented BaTiO3/SrTiO3 perovskite superlattices on Pt(111)/Ti/Al2O3(0001) substrates Reviewed

    Gasidit Panomsuwan, Osamu Takai, Nagahiro Saito

    Applied Physics Letters   Vol. 103   page: 112902   2013.11

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  197. Epitaxial growth of (111)-oriented BaTiO3/SrTiO3 perovskite superlattices on Pt(111)/Ti/Al2O3(0001) substrates Reviewed

    Gasidit Panomsuwan, Osamu Takai, Nagahiro Saito

    Applied Physics Letters   Vol. 103   page: 112902   2013.11

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  198. Degradation of beta-chitosan by solution plasma process (SPP)

    Prasertsung I., Damrongsakkul S., Saito N.

    POLYMER DEGRADATION AND STABILITY   Vol. 98 ( 10 ) page: 2089 - 2093   2013.10

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    DOI: 10.1016/j.polymdegradstab.2013.07.001

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  199. Crosslinking of a Gelatin Solutions Induced by Pulsed Electrical Discharges in Solutions Reviewed

    Isarawut Prasertsung, Siriporn Damrongsakkul, Nagahiro Saito

    PLASMA PROCESSES AND POLYMERS   Vol. 10 ( 9 ) page: 792 - 797   2013.9

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    This study uses discharges in solutions for the treatment of gelatin solutions in order to generate crosslinking. The effects of plasma on the properties of gelatin solutions were investigated, the latter including viscosity, amino acid contents, chemical analyses, and gel strengths. The results show that, after short duration plasma treatments (5-10 min), the viscosity of the gelatin solutions increased, while the concentration of OH free radicals decreased. After adding ethanol to the gelatin solutions, a greater increase in viscosity, and a greater decrease in free radicals were found. This suggests that ethanol provides more free radicals that can promote the crosslinking of the gelatin solution during the plasma treatment, resulting in higher viscosity. The gel strength of the gelatin was greatly enhanced by the plasma treatment of the solution. The results regarding the free amino acid contents showed that the crosslinking degree of plasma-treated gelatin was higher than that of the untreated gelatin. FTIR measurements show that after plasma treatment, the IR bands at 1668 and 1558cm(-1), corresponding to the amide I and II groups of gelatin, shifted to higher wavenumbers, i.e. 1672 and 1564cm(-1), respectively. This suggests that crosslinking has occurred between gelatin molecules. The results show that discharges in solutions may be able to induce crosslinking reactions in the gelatin. Electrical discharges in solutions can be chemical-free, alternative crosslinking methods.

    DOI: 10.1002/ppap.201200148

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  200. Crosslinking of a Gelatin Solutions Induced by Pulsed Electrical Discharges in Solutions Reviewed

    Isarawut Prasertsung, Siriporn Damrongsakkul, Nagahiro Saito

    Plasma Processes and Polymers   Vol. 10 ( 9 ) page: 792-797   2013.9

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  201. Crosslinking of a Gelatin Solutions Induced by Pulsed Electrical Discharges in Solutions Reviewed

    Isarawut Prasertsung, Siriporn Damrongsakkul, Nagahiro Saito

    Plasma Processes and Polymers   Vol. 10 ( 9 ) page: 792-797   2013.9

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  202. Vasotocin mRNA Expression is Sensitive to Testosterone and Oestradiol in the Bed Nucleus of the Stria Terminalis in Female Japanese Quail

    Aste N., Sakamoto E., Kagami M., Saito N.

    JOURNAL OF NEUROENDOCRINOLOGY   Vol. 25 ( 9 ) page: 811 - 825   2013.9

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    DOI: 10.1111/jne.12076

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  203. Crosslinking of a Gelatin Solutions Induced by Pulsed Electrical Discharges in Solutions Reviewed

    Isarawut Prasertsung, Siriporn Damrongsakkul, Nagahiro Saito

    Plasma Processes and Polymers   Vol. 10 ( 9 ) page: 792-797   2013.9

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  204. Vasotocin mRNA Expression is Sensitive to Testosterone and Oestradiol in the Bed Nucleus of the Stria Terminalis in Female Japanese Quail

    Aste N., Sakamoto E., Kagami M., Saito N.

    JOURNAL OF NEUROENDOCRINOLOGY   Vol. 25 ( 9 ) page: 811 - 825   2013.9

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    DOI: 10.1111/jne.12076

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  205. A simple synthesis method for nano-metal catalyst supported on mesoporous carbon; solution plasma process Reviewed

    J. Kang, O. L. Li, N. Saito

    Nanoscale   Vol. 5 ( 15 ) page: 6874-6882   2013.8

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  206. A simple synthesis method for nano-metal catalyst supported on mesoporous carbon; solution plasma process Reviewed

    J. Kang, O. L. Li, N. Saito

    Nanoscale   Vol. 5 ( 15 ) page: 6874-6882   2013.8

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  207. A simple synthesis method for nano-metal catalyst supported on mesoporous carbon; solution plasma process Reviewed

    J. Kang, O. L. Li, N. Saito

    Nanoscale   Vol. 5 ( 15 ) page: 6874-6882   2013.8

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  208. Synthesis of structure-controlled carbon nano spheres by solution plasma process Reviewed

    Jun Kang, Oi Lun Li, Nagahiro Saito

    CARBON   Vol. 60   page: 292 - 298   2013.8

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    Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Structure-controlled carbon nanospheres (CNSs) were synthesized by an innovative plasma in liquid method, termed solution plasma processing (SPP). CNSs were formed by using benzene as a carbon precursor. Typically, 500 mg of CNSs were obtained from 100 ml of benzene with 20 min of treatment. The average diameters of CNSs increased from 20 to 100 nm when the pulse frequency of the bipolar power supply adjusted from 25 to 65 kHz. The TEM images showed that CNSs synthesized at 25-50 kHz consisted of amorphous carbon, while CNSs generated at 65 kHz were composed of continuous short range graphite with turbostratic structure. X-ray diffraction (XRD) patterns and TEM images showed that CNSs synthesized at 25-50 kHz had a low graphitization degree, while CNSs synthesized at 65 kHz consisted of graphite sheets with regular and ordering structure in basal planes. The increase of D/G intensity ratio in Raman spectroscopy confirmed the transition from amorphous carbon to nanocrystalline-graphite (NCG) with increasing pulse frequency. The resistivity of CNSs also increased with increasing pulse frequency CNSs synthesized at 65 kHz have shown similar degree of resistivity as other commercial carbon black materials. (c) 2013 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.carbon.2013.04.040

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  209. Synthesis of Structure-Controlled Carbon Nano Spheres by Solution Plasma Process Reviewed

    J. Kang, O. L. Li, N. Saito

    Carbon   Vol. 60   page: 292-298   2013.8

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  210. Generation of Three-Dimensionally Integrated Micro Solution Plasmas and Its Application to Decomposition of Organic Contaminants in Water Reviewed

    Tatsuru Shirafuji, Yuta Himeno, Nagahiro Saito, Osamu Takai

    Journal of Photopolymer Science and Technology   Vol. 26 ( 4 ) page: 507-511   2013.8

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  211. Generation of Three-Dimensionally Integrated Micro Solution Plasmas and Its Application to Decomposition of Organic Contaminants in Water Reviewed

    Tatsuru Shirafuji, Yuta Himeno, Nagahiro Saito, Osamu Takai

    Journal of Photopolymer Science and Technology   Vol. 26 ( 4 ) page: 507-511   2013.8

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  212. Synthesis of Structure-Controlled Carbon Nano Spheres by Solution Plasma Process Reviewed

    J. Kang, O. L. Li, N. Saito

    Carbon   Vol. 60   page: 292-298   2013.8

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  213. Generation of Three-Dimensionally Integrated Micro Solution Plasmas and Its Application to Decomposition of Organic Contaminants in Water Reviewed

    Tatsuru Shirafuji, Yuta Himeno, Nagahiro Saito, Osamu Takai

    Journal of Photopolymer Science and Technology   Vol. 26 ( 4 ) page: 507-511   2013.8

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  214. One-step synthesis of gold bimetallic nanoparticles with various metal-compositions Reviewed

    M. A. Bratescu, O. Takai, N. Saito

    Journal of Alloys and Compounds   Vol. 562   page: 74-83   2013.6

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  215. One-step synthesis of gold bimetallic nanoparticles with various metal-compositions Reviewed

    M. A. Bratescu, O. Takai, N. Saito

    Journal of Alloys and Compounds   Vol. 562   page: 74-83   2013.6

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  216. One-step synthesis of gold bimetallic nanoparticles with various metal-compositions Reviewed

    M. A. Bratescu, O. Takai, N. Saito

    Journal of Alloys and Compounds   Vol. 562   page: 74-83   2013.6

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  217. One-step synthesis of gold bimetallic nanoparticles with various metal-compositions Reviewed

    Maria Antoaneta Bratescu, Osamu Takai, Nagahiro Saito

    JOURNAL OF ALLOYS AND COMPOUNDS   Vol. 562   page: 74 - 83   2013.6

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    A rapid, one-step process for the synthesis of bimetallic nanoparticles by simultaneous metal reduction and gold erosion in an aqueous solution discharge was investigated. Gold bimetallic nanoparticles were obtained by alloying gold with various types of metals belonging to one of the following categories: divalent sp metals, trivalent sp metals, 3d or 4d metals. The composition of the various gold bimetallic nanoparticles obtained depends on electrochemical factors, charge transfer between gold and other metal, and initial concentration of metal in solution. Transmission electron microscopy and energy dispersive spectroscopy show that the gold bimetallic nanoparticles were of mixed pattern, with sizes of between 5 and 20 nm. A red-shift of the surface plasmon resonance band in the case of the bimetallic nanoparticles Au-Fe, Au-Ga, and Au-In, and a blue-shift of the plasmon band of the Au-Ag nanoparticles was observed. In addition, the interaction of gold bimetallic nanoparticles with unpaired electrons, provided by a stable free radical molecule, was highest for those NPs obtained by alloying gold with a 3d metal. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2013.02.033

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  218. Effect of polymer concentration on the depolymerization of sodium alginate by the solution plasma process Reviewed

    Anyarat Watthanaphanit, Nagahiro Saito

    POLYMER DEGRADATION AND STABILITY   Vol. 98 ( 5 ) page: 1072 - 1080   2013.5

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    Depolymerization of alginate was accessed, for the first time, by the plasma treatment in solution called solution plasma process (SPP). The process was done by applying an electrical discharge into a reactor containing sodium alginate aqueous solution. The key of the production is the generation of reactive species induced by the plasma in a liquid environment that can lead to the scission of polymer chains. Effect of polymer concentration on the SPP processing parameters and the depolymerization efficiency were studied. Three concentrations of sodium alginate solutions, i.e., 0.2, 0.5, and 0.9 %w/v, were prepared. The results showed that increasing concentration of the alginate solution decreased the applied voltage required for the generation of plasma. Optical emission spectra demonstrated that the generation of reactive species was the highest at the lowest alginate concentration (i.e. 0.2 %w/v). Therefore, molecular weight reduction of this concentration after the SPP was more remarkable than the others. The most significant species required for the depolymerization of alginate was the reactive hydrogen species. Molecular weight distributions (MWD) of the obtained low molecular weight alginates (LMALGs) for all concentrations were narrow. Furthermore, reduction trends of molecular weight and viscosity of alginate with varying operation times indicated that the depolymerization of alginate in aqueous solution by the SPP was affected by the combined contribution of two factors: (1) the amount of reactive species generated during the process and (2) the degree of chain entanglement of the polymers. (C) 2013 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.polymdegradstab.2013.01.011

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  219. Effect of polymer concentration on the depolymerization of sodium alginate by the solution plasma process Reviewed

    Anyarat Watthanaphanit, Nagahiro Saito

    Polymer Degradation and Stability   Vol. 98 ( 5 ) page: 1072-1080   2013.5

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  220. Effect of polymer concentration on the depolymerization of sodium alginate by the solution plasma process Reviewed

    Anyarat Watthanaphanit, Nagahiro Saito

    Polymer Degradation and Stability   Vol. 98 ( 5 ) page: 1072-1080   2013.5

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  221. Effect of polymer concentration on the depolymerization of sodium alginate by the solution plasma process Reviewed

    Anyarat Watthanaphanit, Nagahiro Saito

    Polymer Degradation and Stability   Vol. 98 ( 5 ) page: 1072-1080   2013.5

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  222. Solution Plasma Sputtering Processes for the Synthesis of PtAu/C Catalysts for Li-Air Batteries Reviewed

    Chiaki Terashima, Yujiro Iwai, Sung-Pyo Cho, Tomonaga Ueno, Nobuyuki Zettsu, Nagahiro Saito, Osamu Takai

    International Journal of Electrochemical Science   Vol. 8   page: 5407-5420   2013.4

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  223. Solution Plasma Sputtering Processes for the Synthesis of PtAu/C Catalysts for Li-Air Batteries Reviewed

    Chiaki Terashima, Yujiro Iwai, Sung-Pyo Cho, Tomonaga Ueno, Nobuyuki Zettsu, Nagahiro Saito, Osamu Takai

    International Journal of Electrochemical Science   Vol. 8   page: 5407-5420   2013.4

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  224. Protein kinase C eta is targeted to lipid droplets

    Suzuki Michitaka, Iio Yuri, Saito Naoaki, Fujimoto Toyoshi

    HISTOCHEMISTRY AND CELL BIOLOGY   Vol. 139 ( 4 ) page: 505 - 511   2013.4

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    DOI: 10.1007/s00418-013-1083-z

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  225. Protein kinase C eta is targeted to lipid droplets

    Suzuki Michitaka, Iio Yuri, Saito Naoaki, Fujimoto Toyoshi

    HISTOCHEMISTRY AND CELL BIOLOGY   Vol. 139 ( 4 ) page: 505 - 511   2013.4

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    DOI: 10.1007/s00418-013-1083-z

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  226. Chemical Bonding State and Morphology of Silica Materials by Solution Plasma

    YAMAMOTO Taibou, UENO Tomonaga, ZETTSU Nobuyuki, TAKAI Osamu, SAITO Nagahiro

    Journal of The Surface Finishing Society of Japan   Vol. 64 ( 3 ) page: 180 - 184   2013.3

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    Solution plasma processing, a reaction field available for chemical engineering, has high chemical activity because of its high electron temperature in the liquid, but low gas temperature. Consequently, it supplies activated species from plasma to liquid phases. Therefore, solution plasma has been anticipated for application to chemical processes such as synthesis of metal nanoparticles, and as a water treatment for sterilization and waste. We sought to synthesize silica by solution plasma, and to examine the effects of pH in the solution on the morphology and the chemical bonding state. Aqueous solutions containing tetraethoxysilane (TEOS) and ethanol were used as starting solutions. Then HCl or DEA (2.2'-iminodiethanol) was added to the solution to adjust the pH. The obtained materials were evaluated using scanning electron spectroscopy (SEM) and nuclear magnetic resonance (NMR). The morphology changes were observed as a two-dimensional tabular structure in an acid state, three-dimensional spherical structure in a base state, and two-dimensional and three-dimensional mixed structures in a neutral state. These structures originate mainly from the chemical bonding state of Si(OR)<sub>3</sub>(OSi), Si(OR)<sub>2</sub>(OSi)<sub>2</sub> in an acid state, Si(OR)<sub>1</sub>(OSi)<sub>3</sub>, Si(OSi)<sub>4</sub> in a base state, and Si(OR)<sub>2</sub>(OSi)<sub>2</sub> and Si(OR)(OSi)<sub>3</sub> in a neutral state.

    DOI: 10.4139/sfj.64.180

    CiNii Article

  227. Fabrication and characterization of epitaxial SrTiO3/Nb-doped SrTiO3 superlattices by double ECR ion beam sputter deposition Reviewed

    Gasidit Panomsuwan, Osamu Takai, Nagahiro Saito

    VACUUM   Vol. 89   page: 35 - 39   2013.3

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    Epitaxial oxide superlattices (SLs) of SrTiO3 (STO) and Nb-doped SrTiO3(STNO) were fabricated on LaAlO3 (LAO) (001) substrates by an ion beam sputter deposition (IBSD) system having double electron cyclotron resonance (ECR) ion guns. The [STOx/STNOy](10) SLs were epitaxially grown at different stacking sequences (x = 6 nm, y = 1-6 nm) and maintained the periodicity z of 10. Structural properties and surface morphology are found to be strongly dependent on the STNO sublayer thickness (y = 1 nm). Highly strained SLs with two-dimensional growth mode is observed at smaller STNO sublayer thickness (y = 1 nm). With increasing to a critical thickness (y = 4 nm), the SLs are freely strained and transformed to three-dimensional growth mode. The results demonstrate that the double ECR-IBSD is a versatile technique for the growth of high-quality oxide SLs. (C) 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.vacuum.2012.08.011

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  228. Facile fabrication of PtAu alloy clusters using solution plasma sputtering and their electrocatalytic activity Reviewed

    Xiulan Hu, Xiaodong Shen, Osamu Takai, Nagahiro Saito

    JOURNAL OF ALLOYS AND COMPOUNDS   Vol. 552   page: 351 - 355   2013.3

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    Well-crystallized PtAu alloy clusters of about 2.0 nm in mean diameter are successfully fabricated via a one-step route of solution plasma sputtering at atmospheric pressure. The solution plasma provides a novel reaction field with highly energetic state for the formation of PtAu alloy clusters. The synergetic effects of rapid energetic radicals' bombardment, atom vapor diffusion, plasma expansion and solution medium condensation resulted in the formation of PtAu alloy clusters with various relative atom amount ratios. PtAu alloy clusters are highly dispersive in water for a long time without any polymeric stabilizer. As-fabricated PtAu alloy clusters show well electrocatalytic activity. PtAu alloy clusters are easily collected and well re-dispersed in various organic solvents for various potential applications. And PtAu alloy clusters supported on carbon were successfully fabricated by a one-step route. These results imply that this novel process will have potential application in future in the design and mass production of various multifunctional metal and/or alloy clusters. (C) 2012 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2012.08.033

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  229. Growth of highly (110)- and (111)-textured SrTiO3 thin films on Pt(111)/α-Al2O3(0001) substrates by ECR ion beam sputter deposition Reviewed

    Gasidit Panomsuwan, Osamu Takai, Nagahiro Saito

    Solid State Communications   Vol. 158   page: 65 - 69   2013.3

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    SrTiO3 (STO) thin films were directly grown on Pt(111)/α-Al2O3(0001) substrates without Ti buffer layer using electron cyclotron resonance ion beam sputter deposition. Highly (110)- and (111)-textured STO films were obtained at 600 and 750 °C, respectively. The structural, morphological and electrical properties of both textured films were studied and compared. From high-resolution X-ray diffraction data and in-plane pole figure analysis, highly (110)-textured STO film was found to contain three orientation variants related by a 120°in-plane rotation, while highly (111)-textured STO film had two orientation variants related by a 180°in-plane rotation. The presence of rod- and triangular-shaped grains was observed for the (110)- and (111)-textured film surfaces, respectively. Their grain orientations were also consistent with the structural analysis. The leakage current characteristics of Pt/STO/Pt capacitors were found to follow the Schottky emission and Poole-Frenkel conduction mechanisms. A larger dielectric constant of (111)-textured film (320 at 100 kHz) was obtained in comparison with that of (110)-textured film (238 at 100 kHz) due to the effect of biaxial in-plane tensile strain and larger grain size. © 2013 Elsevier Ltd.

    DOI: 10.1016/j.ssc.2012.12.026

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    Other Link: http://orcid.org/0000-0001-8757-3933

  230. Nanomechanical Properties of Amorphous and Polycrystalline SrTiO3 Transparent Thin Films Prepared by Ion Beam Sputtering Reviewed

    Gasidit Panomsuwan, Osamu Takai, Nagahiro Saito

    JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE   Vol. 22 ( 3 ) page: 863 - 868   2013.3

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    Transparent SrTiO3 thin films were deposited on glass substrates by ion beam sputtering at various substrate temperatures. The structural characteristic of the deposited films shows the transition from amorphous phase to polycrystalline phase at 600 A degrees C. The films exhibit a good transparency in the visible region (similar to 80-85%) and a relatively smooth surface. The calculated band gaps for amorphous and polycrystalline films were similar to 4.20 and similar to 3.84 eV, respectively. The refractive index of the films increases with increasing the substrate temperature, and the extinction coefficient of the films in the visible region is in the order of 10(-3), indicating low optical loss. The nanomechanical properties of the films were investigated using nanoindentation technique. Young's modulus and hardness for all films are found to be increased with the increase of substrate temperature.

    DOI: 10.1007/s11665-012-0320-2

    Web of Science

  231. Solution Plasma Synthesis Process of Carbon Nano Particles in Organic Solutions Reviewed

    O. L. Li, J. Kang, K. Urashima, N.Saito

    International Journal of Plasma Environmental Science and Technology   Vol. 7 ( 1 ) page: 31-36   2013.3

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  232. Facile fabrication of PtAu alloy clusters using solution plasma sputtering and their electrocatalytic activity Reviewed

    X. Hu, X. Shen, O. Takai, N. Saito

    Journal of Alloys and Compounds   Vol. 552   page: 351-355   2013.3

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  233. Growth of highly (110)- and (111)-textured SrTiO3 thin films on Pt(111)/α-Al2O3(0001) substrates by ECR ion beam sputter deposition Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Solid State Communications   Vol. 158   page: 65-69   2013.3

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  234. Nanomechanical Properties of Amorphous and Polycrystalline SrTiO3 Transparent Thin Films Prepared by Ion Beam Sputtering Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Journal of Materials Engineering and Performance   Vol. 22 ( 3 ) page: 863-868   2013.3

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  235. Facile fabrication of PtAu alloy clusters using solution plasma sputtering and their electrocatalytic activity Reviewed

    X. Hu, X. Shen, O. Takai, N. Saito

    Journal of Alloys and Compounds   Vol. 552   page: 351-355   2013.3

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  236. Nanomechanical Properties of Amorphous and Polycrystalline SrTiO3 Transparent Thin Films Prepared by Ion Beam Sputtering Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Journal of Materials Engineering and Performance   Vol. 22 ( 3 ) page: 863-868   2013.3

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  237. Growth of highly (110)- and (111)-textured SrTiO3 thin films on Pt(111)/α-Al2O3(0001) substrates by ECR ion beam sputter deposition Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Solid State Communications   Vol. 158   page: 65-69   2013.3

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  238. Facile fabrication of PtAu alloy clusters using solution plasma sputtering and their electrocatalytic activity Reviewed

    X. Hu, X. Shen, O. Takai, N. Saito

    Journal of Alloys and Compounds   Vol. 552   page: 351-355   2013.3

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    Language:English   Publishing type:Research paper (scientific journal)  

  239. Growth of highly (110)- and (111)-textured SrTiO3 thin films on Pt(111)/α-Al2O3(0001) substrates by ECR ion beam sputter deposition Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Solid State Communications   Vol. 158   page: 65-69   2013.3

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  240. Nanomechanical Properties of Amorphous and Polycrystalline SrTiO3 Transparent Thin Films Prepared by Ion Beam Sputtering Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Journal of Materials Engineering and Performance   Vol. 22 ( 3 ) page: 863-868   2013.3

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  241. Solution Plasma Synthesis Process of Carbon Nano Particles in Organic Solutions Reviewed

    O. L. Li, J. Kang, K. Urashima, N.Saito

    International Journal of Plasma Environmental Science and Technology   Vol. 7 ( 1 ) page: 31-36   2013.3

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  242. Discharge time dependence of a solution plasma process for colloidal copper nanoparticle synthesis and particle characteristics Reviewed

    Panuphong Pootawang, Nagahiro Saito, Sang Yul Lee

    NANOTECHNOLOGY   Vol. 24 ( 5 ) page: -   2013.2

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    In this study, we investigate a new synthetic route, termed the solution plasma process, for the synthesis of colloidal copper nanoparticles (CuNPs) in the presence of an amide and acid capping agent. Gelatin and ascorbic acid were selected as the capping agents to protect the particles against coalescence and oxidation side reaction. Using a high voltage power supply, CuNPs were rapidly formed by 1 min after the discharge. The size and shape of the CuNPs were dependent on the discharge time and were clearly influenced by the effect of the capping agents under two characteristics of the discharge medium (pH and temperature). With a long discharge time, the CuNP size tended to decrease with the formation of anisotropic particle morphologies: spherical, cubic, hexagonal, triangular and rod-like shapes. The decrease in CuNP size as a function of discharge time could be explained by the dissolution of CuNPs in a lower pH solution. After 5 min discharge the capping agent evidently allowed the protection of the synthesized CuNPs against oxidation with the presence of anisotropic CuNP shapes. It is demonstrated that the CuNP shape could be tuned from spherical to anisotropic shapes without the undesirable oxidation by adjusting the discharge time of the solution plasma. These advantages are valuable for material engineering to design the properties of Cu-based nanoparticles for the desired applications.

    DOI: 10.1088/0957-4484/24/5/055604

    Web of Science

  243. Optical and mechanical properties of transparent SrTiO3 thin films deposited by ECR ion beam sputter deposition Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    physica status solidi (a)   Vol. 210 ( 2 ) page: 311-319   2013.2

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  244. Optical and mechanical properties of transparent SrTiO3 thin films deposited by ECR ion beam sputter deposition Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    physica status solidi (a)   Vol. 210 ( 2 ) page: 311-319   2013.2

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  245. Optical and mechanical properties of transparent SrTiO3 thin films deposited by ECR ion beam sputter deposition Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    physica status solidi (a)   Vol. 210 ( 2 ) page: 311-319   2013.2

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  246. Comparison between the Mechanism of Liquid Plasma Discharge Process in Water and Organic Solution (論文特集 2012年度静電気学会全国大会)

    LI Helena Oi Lun, KANG Jun, URASHIMA Kuniko, SAITO Nagahiro

    静電気学会誌   Vol. 37 ( 1 ) page: 22 - 27   2013.1

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    CiNii Article

  247. Comparison between the Mechanism of Liquid Plasma Discharge Process in Water and Organic Solution (論文特集 2012年度静電気学会全国大会)

    LI Helena Oi Lun, KANG Jun, URASHIMA Kuniko, SAITO Nagahiro

    静電気学会誌   Vol. 37 ( 1 ) page: 22 - 27   2013.1

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  248. Simple Synthesis of Platinum Nanoparticles by Plasma Sputtering in Water Reviewed

    X. Hu, O. Takai, N. Saito

    Japanese Journal of Applied Physics   Vol. 52 ( 1S ) page: 01AN05   2013.1

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  249. Simple Synthesis of Platinum Nanoparticles by Plasma Sputtering in Water Reviewed

    X. Hu, O. Takai, N. Saito

    Japanese Journal of Applied Physics   Vol. 52 ( 1S ) page: 01AN05   2013.1

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  250. Simple Synthesis of Platinum Nanoparticles by Plasma Sputtering in Water Reviewed

    X. Hu, O. Takai, N. Saito

    Japanese Journal of Applied Physics   Vol. 52 ( 1S ) page: 01AN05   2013.1

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  251. Discharge time dependence of a solution plasma process for colloidal copper nanoparticle synthesis and particle characteristics Reviewed

    P. Pootawang, N. Saito, S. Y. Lee

    Nanotechnology   Vol. 24   page: 055604   2013.1

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  252. Discharge time dependence of a solution plasma process for colloidal copper nanoparticle synthesis and particle characteristics Reviewed

    P. Pootawang, N. Saito, S. Y. Lee

    Nanotechnology   Vol. 24   page: 055604   2013.1

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  253. Discharge time dependence of a solution plasma process for colloidal copper nanoparticle synthesis and particle characteristics Reviewed

    P. Pootawang, N. Saito, S. Y. Lee

    Nanotechnology   Vol. 24   page: 055604   2013.1

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  254. Simple Synthesis of Platinum Nanoparticles by Plasma Sputtering in Water Reviewed

    Xiulan Hu, Osamu Takai, Nagahiro Saito

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 52 ( 1 ) page: -   2013.1

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    We applied a novel method of plasma sputtering in water for simple and fast preparation of carbon-supported platinum nanoparticles at atmospheric pressure from platinum wire electrodes without using any stabilizers, chemical reductant, plasma-generating gas, or salt solution in an open system. Upon plasma sputtering, special waveforms of voltage and current were obtained using a pulsed power supply. The obtained emission spectra clarified that platinum atoms were formed in the plasma region from the electrode surface owing to bombardment of the surface by highly energetic electrons and radicals derived from plasma. Thus, carbon-supported 2 nm and highly dispersed platinum nanoparticles were successfully synthesized by this fast and simple plasma sputtering method. Highly crystallized platinum nanoparticles show good electrocatalytic activity. This plasma sputtering technique has shown a potential application to the synthesis of other metal nanoparticles. (C) 2013 The Japan Society of Applied

    DOI: 10.7567/JJAP.52.01AN05

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  255. A simple synthesis method for nano-metal catalyst supported on mesoporous carbon: the solution plasma process Reviewed

    Jun Kang, Oi Lun Li, Nagahiro Saito

    NANOSCALE   Vol. 5 ( 15 ) page: 6874 - 6882   2013

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    Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    High-electrocatalytic-activity noble nanoparticles (NPs) supported on carbon nanoballs (CNBs) were synthesized using an innovative plasma-in-liquid method, which is known as solution plasma processing (SPP). This technique uses a one-step method for the synthesis of NPs on carbon materials. CNBs are formed using benzene as a carbon precursor while gold (Au) or platinum (Pt) nanoparticles are generated instantaneously via sputtering from metal electrodes. The synthesized NP/CNBs were annealed at 850 degrees C in order to increase the conductivity of the material. The results of structural characterizations reveal that the Au and Pt NPs are smaller than 10 nm and have a uniform size distribution, and these NPs are successfully loaded onto highly mesoporous CNBs that have an average pore diameter between 13 and 16 nm. In the results from cyclic voltammetry measurements, the Au/CNBs and Pt/CNBs show clear peaks corresponding to the oxidation and reduction features in the catalytic reactions. Apart from noble nanoparticles, SPP can also be used to synthesize various kinds of NPs including bimetallic NPs loaded on spherical carbon supports by changing the working electrodes. The proposed mechanism for the synthesis is discussed in detail. This method shows potential to be a candidate for the next-generation synthesis of NP/carbon in the future.

    DOI: 10.1039/c3nr01229h

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  256. Generation of Three-Dimensionally Integrated Micro Solution Plasmas and Its Application to Decomposition of Organic Contaminants in Water Reviewed

    Shirafuji T, Himeno Y, Saito N, Takai O.

    Journal of Photopolymer Science and Technology   Vol. 26 ( 4 ) page: 507-511   2013

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  257. Functionalization of Multiwalled Carbon Nanotubes by Solution Plasma Processing in Ammonia Aqueous Solution and Preparation of Composite Material with Polyamide 6 Reviewed

    Shirafuji T, Noguchi Y, Yamamoto T, Hieda J, Saito N, Takai O, Tsuchimoto A, Nojima K, Okabe Y.

    Japanese Journal of Applied Physics   Vol. 52 ( 12 ) page: -   2013

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    DOI: 10.7567/jjap.52.125101

  258. Gold Nanoparticle Synthesis Using Three-Dimensionally Integrated Micro-Solution Plasmas Reviewed

    Shirafuji T, Ueda J, Nakamura A, Cho S. P, Saito N, Takai O.

    Japanese Journal of Applied Physics   Vol. 52 ( 12 ) page: -   2013

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    DOI: 10.7567/jjap.52.126202

  259. Solution Plasma Sputtering Processes for the Synthesis of PtAu/C Catalysts for Li-Air Batteries Reviewed

    Terashima C, Iwai Y, Cho S. P, Ueno T, Zettsu N, Saito N, Takai O.

    International Journal of Electrochemical Science   Vol. 8 ( 4 ) page: 5407-5420   2013

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  260. Highly efficient treatment of industrial wastewater by solution plasma with low environmental load Reviewed

    Long-fei Cai, Yun-ying Wu, Yun-hai Wu, Siro Yamauti, Nagahiro Saito

    WATER SCIENCE AND TECHNOLOGY   Vol. 68 ( 4 ) page: 923 - 928   2013

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    Advanced oxidation techniques are efficient processes to dispose of organic contaminants in industrial wastewater with low secondary pollution. The solution plasma technique was featured as an advanced oxidation technique with low secondary pollution and high efficiency. However, the solution plasma technique reported previously could only treat wastewater of less than 200 mL owing to the limited plasma generated by only one pair of electrodes. In this work, multiple pairs of electrodes were installed at the bottom of the reaction vessel to generate plasma for decomposing methylene blue trihydrate (MB) and methyl orange (MO) solutions with a batch amount of 18 L/batch. The solution plasma technique was compared with direct ozonation in decomposition of MB and MO wastewater. A surprising phenomenon is that MO was more readily decomposed than MB by using direct ozonation, whereas the removal of MO was too low, and MB was more readily decomposed than MO by using the solution plasma technique.

    DOI: 10.2166/wst.2013.321

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  261. Comparison between the Mechanism of Liquid Plasma Discharge Process in Water and Organic Solution Reviewed

    Helena Oi Lun LI, Jun KANG, Kuniko URASHIMA, Nagahiro SAITO

    Journal of the Institute of Electrostatics Japan   Vol. 37 ( 1 ) page: 22-27   2013

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  262. Solution Plasma Synthesis Process of Carbon Nano Particles in Organic Solutions Reviewed

    L. Li, J. Kang, K. Urashima, N. Saito

    International Journal of Plasma Environmental Science and Technology   Vol. 7 ( 1 ) page: 31-36   2013

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  263. Epitaxial growth of (111)-oriented BaTiO3/SrTiO3 perovskite superlattices on Pt(111)/Ti/Al2O3(0001) substrates

    G. Panomsuwan, O. Takai, N. Saito

    Applied Physics Letters   Vol. 103   page: 112902   2013

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    DOI: 10.1063/1.4820780

  264. Degradation of b-chitosan by solution plasma process (SPP) Reviewed

    I. Prasertsung, S. Damrongsakkul, N. Saito

        2013

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    DOI: 10.1016

  265. Epitaxial growth of (111)-oriented BaTiO3/SrTiO3 perovskite superlattices on Pt(111)/Ti/Al2O3(0001) substrates Reviewed

    Panomsuwan, G; Takai, O; Saito, N

    APPLIED PHYSICS LETTERS   Vol. 103 ( 11 ) page: 112902   2013

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    DOI: 10.1063/1.4820780

  266. Gold Nanoparticle Synthesis Using Three-Dimensionally Integrated Micro-Solution Plasmas Reviewed

    Shirafuji, T; Ueda, J; Nakamura, A; Cho, SP; Saito, N; Takai, O

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 52 ( 12 ) page: 126202   2013

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    DOI: 10.7567/JJAP.52.126202

  267. Functionalization of Multiwalled Carbon Nanotubes by Solution Plasma Processing in Ammonia Aqueous Solution and Preparation of Composite Material with Polyamide 6 Reviewed

    Shirafuji, T; Noguchi, Y; Yamamoto, T; Hieda, J; Saito, N; Takai, O; Tsuchimoto, A; Nojima, K; Okabe, Y

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 52 ( 12 ) page: UNSP 125101   2013

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    DOI: 10.7567/JJAP.52.125101

  268. Comparison between the Mechanism of Liquid Plasma Discharge Process in Water and Organic Solution Reviewed

    Helena Oi Lun LI, Jun KANG, Kuniko URASHIMA, Nagahiro SAITO

    Journal of the Institute of Electrostatics Japan   Vol. 37 ( 1 ) page: 22-27   2013

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  269. Degradation of b-chitosan by solution plasma process (SPP) Reviewed

    I. Prasertsung, S. Damrongsakkul, N. Saito

        2013

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  270. Generation of Three-Dimensionally Integrated Micro Solution Plasmas and Its Application to Decomposition of Organic Contaminants in Water Reviewed

    Shirafuji T, Himeno Y, Saito N, Takai O

    Journal of Photopolymer Science and Technology   Vol. 26 ( 4 ) page: 507-511   2013

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    Other Link: http://orcid.org/0000-0001-8757-3933

  271. Generation of Three-Dimensionally Integrated Micro Solution Plasmas and Its Application to Decomposition of Organic Contaminants in Water

    Shirafuji Tatsuru, Himeno Yuta, Saito Nagahiro, Takai Osamu

    Journal of Photopolymer Science and Technology   Vol. 26 ( 4 ) page: 507 - 511   2013

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    Publishing type:Research paper (scientific journal)   Publisher:フォトポリマー学会  

    Three-dimensionally integrated micro solution plasmas were generated in gas bubbles in porous dielectric materials filled with gas/liquid mixed medium. The methylene blue molecules in aqueous solution were decomposed by the treatment with the three-dimensionally integrated micro solution plasmas. Decomposition efficiency was 16 times higher than conventional solution plasma in the case of applied voltage of 5 kV. With decreasing applied voltage from 5 to 2 kV, the decomposition efficiency was improved up to 360% in comparison to that of 5 kV, while reduction in the decomposition rate was 40%.

    DOI: 10.2494/photopolymer.26.507

    CiNii Article

  272. Solution Plasma Synthesis Process of Carbon Nano Particles in Organic Solutions Reviewed

    L. Li, J. Kang, K. Urashima, N. Saito

    International Journal of Plasma Environmental Science and Technology   Vol. 7 ( 1 ) page: 31-36   2013

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  273. Synthesis of Nanomaterials by Solution Plasma Processing

    Takai Osamu, Bratescu Maria Antoaneta, Ueno Tomonaga, Saito Nagahiro

    MICRO-NANO MECHATRONICS - NEW TRENDS IN MATERIAL, MEASUREMENT, CONTROL, MANUFACTURING AND THEIR APPLICATIONS IN BIOMEDICAL ENGINEERING     page: 109 - 121   2013

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    Web of Science

  274. Comparison between the Mechanism of Liquid Plasma Discharge Process in Water and Organic Solution Reviewed

    Helena Oi Lun LI, Jun KANG, Kuniko URASHIMA, Nagahiro SAITO

    Journal of the Institute of Electrostatics Japan   Vol. 37 ( 1 ) page: 22-27   2013

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  275. Generation of Three-Dimensionally Integrated Micro Solution Plasmas and Its Application to Decomposition of Organic Contaminants in Water

    Shirafuji Tatsuru, Himeno Yuta, Saito Nagahiro, Takai Osamu

    Journal of Photopolymer Science and Technology   Vol. 26 ( 4 ) page: 507 - 511   2013

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    Publishing type:Research paper (scientific journal)   Publisher:フォトポリマー学会  

    Three-dimensionally integrated micro solution plasmas were generated in gas bubbles in porous dielectric materials filled with gas/liquid mixed medium. The methylene blue molecules in aqueous solution were decomposed by the treatment with the three-dimensionally integrated micro solution plasmas. Decomposition efficiency was 16 times higher than conventional solution plasma in the case of applied voltage of 5 kV. With decreasing applied voltage from 5 to 2 kV, the decomposition efficiency was improved up to 360% in comparison to that of 5 kV, while reduction in the decomposition rate was 40%.

    DOI: 10.2494/photopolymer.26.507

    CiNii Article

  276. Generation of Three-Dimensionally Integrated Micro Solution Plasmas and Its Application to Decomposition of Organic Contaminants in Water Reviewed

    Shirafuji T, Himeno Y, Saito N, Takai O

    Journal of Photopolymer Science and Technology   Vol. 26 ( 4 ) page: 507-511   2013

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    Other Link: http://orcid.org/0000-0001-8757-3933

  277. Degradation of b-chitosan by solution plasma process (SPP) Reviewed

    I. Prasertsung, S. Damrongsakkul, N. Saito

        2013

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  278. Solution Plasma Sputtering Processes for the Synthesis of PtAu/C Catalysts for Li-Air Batteries Reviewed

    Terashima C, Iwai Y, Cho S. P, Ueno T, Zettsu N, Saito N, Takai O

    International Journal of Electrochemical Science   Vol. 8 ( 4 ) page: 5407-5420   2013

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    Other Link: http://orcid.org/0000-0001-8757-3933

  279. Synthesis of Nanomaterials by Solution Plasma Processing

    Takai Osamu, Bratescu Maria Antoaneta, Ueno Tomonaga, Saito Nagahiro

    MICRO-NANO MECHATRONICS - NEW TRENDS IN MATERIAL, MEASUREMENT, CONTROL, MANUFACTURING AND THEIR APPLICATIONS IN BIOMEDICAL ENGINEERING     page: 109 - 121   2013

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    Web of Science

  280. Solution Plasma Synthesis Process of Carbon Nano Particles in Organic Solutions Reviewed

    L. Li, J. Kang, K. Urashima, N. Saito

    International Journal of Plasma Environmental Science and Technology   Vol. 7 ( 1 ) page: 31-36   2013

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  281. Orientation control of textured SrTiO3 thin films on platinized alpha-Al2O3 (0001) by an ion beam sputter deposition method

    Panomsuwan G., Takai O., Saito N.

    JOURNAL OF PHYSICS D-APPLIED PHYSICS   Vol. 45 ( 49 )   2012.12

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    DOI: 10.1088/0022-3727/45/49/494003

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  282. Orientation control of textured SrTiO3 thin films on platinized alpha-Al2O3 (0001) by an ion beam sputter deposition method

    Panomsuwan G., Takai O., Saito N.

    JOURNAL OF PHYSICS D-APPLIED PHYSICS   Vol. 45 ( 49 )   2012.12

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    DOI: 10.1088/0022-3727/45/49/494003

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  283. Inheritance and Developmental Pattern of Cerebral Hernia in the Crested Polish Chicken

    Yoshimura Keiji, Kinoshita Keiji, Mizutani Makoto, Matsuda Yoichi, Saito Noboru

    JOURNAL OF EXPERIMENTAL ZOOLOGY PART B-MOLECULAR AND DEVELOPMENTAL EVOLUTION   Vol. 318B ( 8 ) page: 613 - 620   2012.12

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    DOI: 10.1002/jez.b.22464

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  284. Inheritance and Developmental Pattern of Cerebral Hernia in the Crested Polish Chicken

    Yoshimura Keiji, Kinoshita Keiji, Mizutani Makoto, Matsuda Yoichi, Saito Noboru

    JOURNAL OF EXPERIMENTAL ZOOLOGY PART B-MOLECULAR AND DEVELOPMENTAL EVOLUTION   Vol. 318B ( 8 ) page: 613 - 620   2012.12

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    DOI: 10.1002/jez.b.22464

    Web of Science

  285. 15th International Conference of Thin Films (ICTF-15)

    TAKAI Osamu, SAITO Nagahiro, TERASHIMA Chiaki

    Journal of the Vacuum Society of Japan   Vol. 55 ( 10 ) page: 464 - 468   2012.10

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    DOI: 10.3131/jvsj2.55.464

    CiNii Article

  286. 自己組織化材料とバイオミメティック応用

    上野 智永, 是津 信行, 石崎 貴裕, 齋藤 永宏

    材料の科学と工学 = Materials science and technology   Vol. 49 ( 4 ) page: 157 - 161   2012.8

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  287. Enhanced memory window of Au/BaTiO3/SrTiO3/Si(001) MFIS structure with high c-axis orientation for non-volatile memory applications Reviewed

    Panomsuwan, Gasidit, Osamu Takai, Nagahiro Saito

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   Vol. 108 ( 2 ) page: 337-342   2012.8

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  288. Enhanced memory window of Au/BaTiO3/SrTiO3/Si(001) MFIS structure with high c-axis orientation for non-volatile memory applications Reviewed

    Panomsuwan, Gasidit, Osamu Takai, Nagahiro Saito

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   Vol. 108 ( 2 ) page: 337-342   2012.8

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  289. Enhanced memory window of Au/BaTiO3/SrTiO3/Si(001) MFIS structure with high c-axis orientation for non-volatile memory applications

    Panomsuwan Gasidit, Takai Osamu, Saito Nagahiro

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   Vol. 108 ( 2 ) page: 337 - 342   2012.8

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00339-012-7011-6

    Web of Science

  290. Enhanced memory window of Au/BaTiO3/SrTiO3/Si(001) MFIS structure with high c-axis orientation for non-volatile memory applications Reviewed

    Panomsuwan, Gasidit, Osamu Takai, Nagahiro Saito

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   Vol. 108 ( 2 ) page: 337-342   2012.8

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  291. Enhanced memory window of Au/BaTiO3/SrTiO3/Si(001) MFIS structure with high c-axis orientation for non-volatile memory applications

    Panomsuwan Gasidit, Takai Osamu, Saito Nagahiro

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   Vol. 108 ( 2 ) page: 337 - 342   2012.8

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    DOI: 10.1007/s00339-012-7011-6

    Web of Science

  292. Study on the Combustion Inhibition of Poly Phenylene Ether Alloy

    YAMASHITA Takehiko, NAKASHIMA Erika, TAKEDA Kunihiko, SAITO Nagahiro, TAKAI Osamu

    KOBUNSHI RONBUNSHU   Vol. 69 ( 6 ) page: 297 - 299   2012.6

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    In this study, we evaluated the flame retardant properties of several chemical compounds to polyphenylene ether alloy. Some of them (metallic sulfide and a variety of carboxylate salts) are stronger than general flame retardants such as red phosphorus. Molybdenum disulfide is widely used as lubricant and sodium benzoate and disodium succinate are used as food additives. So it is a new insight that they have a significant effect on the flame retardancy of polyphenylene ether alloy. Molybdenum disulfide is a catalyst that degrades polyphenylene ether alloy. We also found a combinatorial effect when blending polyphenylene ether alloy with both molybdenum disulfide and sodium benzoate that show a stronger combustion inhibition than each single compound.

    DOI: 10.1295/koron.69.297

    CiNii Article

  293. Synthesis of nanocluster by solution plasma Reviewed

      Vol. 31 ( 6 ) page: 94-97   2012.6

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    CiNii Article

  294. Study on the Combustion Inhibition of Poly Phenylene Ether Alloy Reviewed

    T. Yamashita, E. Nakashima, K. Takeda, N. Saito, O. Takai

    Kobunshi Ronbunshu   Vol. 69 ( 6 ) page: 297-299   2012.6

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  295. Study on the Combustion Inhibition of Poly Phenylene Ether Alloy

    Yamashita Takehiko, Nakashima Erika, Takeda Kunihiko, Saito Nagahiro, Takai Osamu

    KOBUNSHI RONBUNSHU   Vol. 69 ( 6 ) page: 297 - 299   2012.6

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    Web of Science

  296. Study on the Combustion Inhibition of Poly Phenylene Ether Alloy Reviewed

    T. Yamashita, E. Nakashima, K. Takeda, N. Saito, O. Takai

    Kobunshi Ronbunshu   Vol. 69 ( 6 ) page: 297-299   2012.6

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  297. Study on the Combustion Inhibition of Poly Phenylene Ether Alloy

    Yamashita Takehiko, Nakashima Erika, Takeda Kunihiko, Saito Nagahiro, Takai Osamu

    KOBUNSHI RONBUNSHU   Vol. 69 ( 6 ) page: 297 - 299   2012.6

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    Web of Science

  298. Study on the Combustion Inhibition of Poly Phenylene Ether Alloy Reviewed

    T. Yamashita, E. Nakashima, K. Takeda, N. Saito, O. Takai

    Kobunshi Ronbunshu   Vol. 69 ( 6 ) page: 297-299   2012.6

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  299. Preparation and wettability examinations of transparent SiO2 binder-added MgF2 nanoparticle coatings covered with fluoro-alkyl silane self-assembled monolayer Reviewed

    Tsuyoshi Murata, Junko Hieda, Nagahiro Saito, Osamu Takai

    APPLIED OPTICS   Vol. 51 ( 13 ) page: 2298 - 2305   2012.5

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    SiO2-added MgF2 nanoparticle coatings with various surface roughness properties were formed on fused silica-glass substrates from autoclaved sols prepared at 100-180 degrees C. To give it hydrophobicity, we treated the samples with fluoro-alkyl silane (FAS) vapor to form self-assembled monolayers on the nanoparticle coating and we examined the wettability of the samples. The samples preserved good transparency even after the FAS treatment. The wettability examination revealed that higher autoclave temperatures produced a larger average MgF2 nanoparticle particle size, a larger surface roughness, and a higher contact angle and the roll-off angle. (c) 2012 Optical Society of America

    DOI: 10.1364/AO.51.002298

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  300. Preparation and wettability examinations of transparent SiO2 binder-added MgF2 nanoparticle coatings covered with fluoro-alkyl silane self-assembled monolayer Reviewed

    T. Murata, J. Hieda, N. Saito, O. Takai

    Applied Optics   Vol. 51 ( 13 ) page: 2298-2305   2012.5

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  301. Preparation and wettability examinations of transparent SiO2 binder-added MgF2 nanoparticle coatings covered with fluoro-alkyl silane self-assembled monolayer Reviewed

    T. Murata, J. Hieda, N. Saito, O. Takai

    Applied Optics   Vol. 51 ( 13 ) page: 2298-2305   2012.5

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  302. Preparation and wettability examinations of transparent SiO2 binder-added MgF2 nanoparticle coatings covered with fluoro-alkyl silane self-assembled monolayer Reviewed

    T. Murata, J. Hieda, N. Saito, O. Takai

    Applied Optics   Vol. 51 ( 13 ) page: 2298-2305   2012.5

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  303. Effects of Crystallization on Internal Stress of ITO Films

    KOJIMA Hiroyasu, SAITO Nagahiro, TAKAI Osamu

      Vol. 63 ( 4 ) page: 272 - 274   2012.4

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    CiNii Article

  304. Active Species Generated by a Pulsed Arc Electrohydraulic Discharge Plasma Channel in Contaminated Water Treatments Reviewed

    L. O. Li, N. Takeuchi, Z. He, Y. Guo, K. Yasuoka, J. S. Chang, N. Saito

    Plasma Chemistry and Plasma Processing   Vol. 32 ( 2 ) page: 343-358   2012.4

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  305. Active Species Generated by a Pulsed Arc Electrohydraulic Discharge Plasma Channel in Contaminated Water Treatments Reviewed

    L. O. Li, N. Takeuchi, Z. He, Y. Guo, K. Yasuoka, J. S. Chang, N. Saito

    Plasma Chemistry and Plasma Processing   Vol. 32 ( 2 ) page: 343-358   2012.4

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  306. Effects of Substrate Temperature on Properties of Tin-Doped Indium Oxide Films Deposited by Activated Electron Beam Evaporation

    KOJIMA Hiroyasu, SAITO Nagahiro, TAKAI Osamu

    表面技術 = The journal of the Surface Finishing Society of Japan   Vol. 63 ( 3 ) page: 173 - 178   2012.3

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    The coating process was conducted using an inline-type plasma deposition system. Thin and thick films containing SnO<sub>2</sub> were prepared from the starting material sintered ITO pellets (0–15 wt% SnO<sub>2</sub>). The thin film (<0.6 μm thick) showed an amorphous-like structure. The thick film (>1 μm thick) showed a well-ordered crystalline structure. The crystalline and electrical properties of the films were dependent on the deposition temperature and were closely related to the SnO<sub>2</sub> contents. Films deposited on substrates at temperatures of 50–180°C comprised a mixture of amorphous and polycrystalline phases and had a hazy appearance because of light scattering at the rough surface. That appearance was not observed in films with 0 wt% SnO<sub>2</sub> content, but it was observed with increasing SnO<sub>2</sub> content and substrate temperature. In films with thickness greater than 0.6 μm, the hazy appearance was more pronounced than in films with thickness of less than 0.6 μm. Polycrystalline ITO films with a clean and transparent appearance, as well as minimum resistivity of 1.7×10<sup>−4</sup> Ω cm, were obtained on substrates at 180 °C (4 wt%, 7.5 wt% SnO<sub>2</sub>). Transparent and uniform ITO films with sheet resistance of 1.7 Ω/□ were obtained at 2.1 μm thickness at a high deposition rate (ca. 0.5 μm/min).

    DOI: 10.4139/sfj.63.173

    CiNii Article

  307. High-Rate Reactive Deposition of SiO₂ Films Using a New DC Rotary Sputtering Cathode

    KOJIMA Hiroyasu, SAITO Nagahiro, TAKAI Osamu

    表面技術 = The journal of the Surface Finishing Society of Japan   Vol. 63 ( 3 ) page: 179 - 183   2012.3

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    DC reactive sputtering of SiO<sub>2</sub> films is performed using a new rotary cathode. The cathode is positioned at the center of the vacuum chamber used for deposition, so that the chamber is partitioned into a pre-sputtering zone and a deposition zone assisted by a partition block. When this new rotary cathode is used, the insulating film formed at the boundary between the eroded and uneroded areas on the target surface is removed. The insulating film mentioned above causes arcing during sputtering, but the new method suppresses arcing, and the electrical conductivity of the metallic cathode is increased. Consequently, the deposition rate is increased considerably during DC reactive sputtering.<br>This new method necessitates two separate zones in the vacuum chamber: a pre-sputtering zone and a deposition zone. Plasma of two types must be introduced into the two zones simultaneously. The ignition voltage and sputtering voltage in each zone are controlled according to the discharge gas pressure in each zone. Using this method, the deposition rate for SiO<sub>2</sub> films can be increased to 4 nm/s, which is 2.5 times the conventional deposition rate.

    DOI: 10.4139/sfj.63.179

    CiNii Article

  308. Effects of Substrate Temperature on Properties of Tin-Doped Indium Oxide Films Deposited by Activated Electron Beam Evaporation

    KOJIMA Hiroyasu, SAITO Nagahiro, TAKAI Osamu

    表面技術 = The journal of the Surface Finishing Society of Japan   Vol. 63 ( 3 ) page: 173 - 178   2012.3

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    Publishing type:Research paper (scientific journal)   Publisher:一般社団法人 表面技術協会  

    The coating process was conducted using an inline-type plasma deposition system. Thin and thick films containing SnO<sub>2</sub> were prepared from the starting material sintered ITO pellets (0–15 wt% SnO<sub>2</sub>). The thin film (<0.6 μm thick) showed an amorphous-like structure. The thick film (>1 μm thick) showed a well-ordered crystalline structure. The crystalline and electrical properties of the films were dependent on the deposition temperature and were closely related to the SnO<sub>2</sub> contents. Films deposited on substrates at temperatures of 50–180°C comprised a mixture of amorphous and polycrystalline phases and had a hazy appearance because of light scattering at the rough surface. That appearance was not observed in films with 0 wt% SnO<sub>2</sub> content, but it was observed with increasing SnO<sub>2</sub> content and substrate temperature. In films with thickness greater than 0.6 μm, the hazy appearance was more pronounced than in films with thickness of less than 0.6 μm. Polycrystalline ITO films with a clean and transparent appearance, as well as minimum resistivity of 1.7×10<sup>−4</sup> Ω cm, were obtained on substrates at 180 °C (4 wt%, 7.5 wt% SnO<sub>2</sub>). Transparent and uniform ITO films with sheet resistance of 1.7 Ω/□ were obtained at 2.1 μm thickness at a high deposition rate (ca. 0.5 μm/min).

    DOI: 10.4139/sfj.63.173

    CiNii Article

  309. High-Rate Reactive Deposition of SiO₂ Films Using a New DC Rotary Sputtering Cathode

    KOJIMA Hiroyasu, SAITO Nagahiro, TAKAI Osamu

    表面技術 = The journal of the Surface Finishing Society of Japan   Vol. 63 ( 3 ) page: 179 - 183   2012.3

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    Publishing type:Research paper (scientific journal)   Publisher:一般社団法人 表面技術協会  

    DC reactive sputtering of SiO<sub>2</sub> films is performed using a new rotary cathode. The cathode is positioned at the center of the vacuum chamber used for deposition, so that the chamber is partitioned into a pre-sputtering zone and a deposition zone assisted by a partition block. When this new rotary cathode is used, the insulating film formed at the boundary between the eroded and uneroded areas on the target surface is removed. The insulating film mentioned above causes arcing during sputtering, but the new method suppresses arcing, and the electrical conductivity of the metallic cathode is increased. Consequently, the deposition rate is increased considerably during DC reactive sputtering.<br>This new method necessitates two separate zones in the vacuum chamber: a pre-sputtering zone and a deposition zone. Plasma of two types must be introduced into the two zones simultaneously. The ignition voltage and sputtering voltage in each zone are controlled according to the discharge gas pressure in each zone. Using this method, the deposition rate for SiO<sub>2</sub> films can be increased to 4 nm/s, which is 2.5 times the conventional deposition rate.

    DOI: 10.4139/sfj.63.179

    CiNii Article

  310. Growth and characterization of highly c-axis textured SrTiO3 thin films directly grown on Si(001) substrates by ion beam sputter deposition

    Panomsuwan G., Cho S. -P., Saito N., Takai O.

    CRYSTAL RESEARCH AND TECHNOLOGY   Vol. 47 ( 2 ) page: 187 - 194   2012.2

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    DOI: 10.1002/crat.201100573

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  311. Growth and characterization of highly c-axis textured SrTiO3 thin films directly grown on Si(001) substrates by ion beam sputter deposition

    Panomsuwan G., Cho S. -P., Saito N., Takai O.

    CRYSTAL RESEARCH AND TECHNOLOGY   Vol. 47 ( 2 ) page: 187 - 194   2012.2

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    DOI: 10.1002/crat.201100573

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  312. Rapid Synthesis and Structural Characterization of Well-Defined Gold Clusters by Solution Plasma Sputtering Reviewed

    Xiulan Hu, Sung-Pyo Cho, Osamu Takai, Nagahiro Saito

    CRYSTAL GROWTH & DESIGN   Vol. 12 ( 1 ) page: 119 - 123   2012.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Ultrafine metal nanoparticles of a few nanometers in diameter exhibit size-dependent photonic and electric properties that are of interest for applications such as biosensors, catalysts, optics, and electronics. Chemical approaches and vacuum metal-vapor-condensation physical techniques were used to successfully synthesize gold nanoparticles. While it is difficult to obtain monodisperse and small sized gold nanopartides without any reductant and polymer stabilizer or under vacuum conditions, in the present study, multiply twinned and near monodisperse gold clusters of diameter less than 2.0 nm were successfully fabricated for the first time by solution plasma sputtering in liquid nitrogen (LN2) without any chemical additions (such as reductant and polymer stabilizer). Gold clusters formed in several microseconds simultaneously with solution plasma sputtering in an open system under atmospheric pressure. Gold clusters are identified to be well crystalline and multitwin-particles (MTPs) by high-resolution transmission electron microscopy. No surface plasmon resonance band was detected in the gold cluster aqueous solutions. Such MTPs with special corners and edges would be beneficial for tailoring catalytic properties at the nanoscale. The solution plasma sputtering method will have potential application in the future in the design and mass preparation of various multifunctional metal dusters.

    DOI: 10.1021/cg2008528

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  313. Growth and characterization of highly c-axis textured SrTiO3 thin films directly grown on Si(001) substrates by ion beam sputter deposition Reviewed

    G. Panomsuwan, S. P. Cho, N. Saito, O. Takai

    Crystal Research and Technology   Vol. 47 ( 2 ) page: 187-194   2012

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  314. Preparation of low molecular weight chitosan using solution plasma system Reviewed

    I. Prasertsung, S. Damrongsakku, C. Terashima, N. Saito, O. Takai

    Carbohydrate Polymers   Vol. 87 ( 4 ) page: 2745-2749   2012

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  315. アークイオンプレーティング法によるITO膜の内部応力に及ぼす結晶化の影響 Reviewed

    小島啓安, 齋藤永宏, 高井治

    表面技術   Vol. 63 ( 4 ) page: 272-274   2012

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  316. High-rate reactive deposition of SiO2 films using a new DC rotary sputtering cathode Reviewed

    H. Kojima, N. Saito, O. Takai

      Vol. 63 ( 3 ) page: 179-183   2012

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  317. High sensitive detection of volatile organic compounds using superhydrophobic quartz crystal microbalance Reviewed

    N. Andreeva, T. Ishizaki, P. Baroch, N. Saito

    Sensors and Actuators B: Chemical   Vol. 164 ( 1 ) page: 15-21   2012

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  318. Effect of substrate temperature on properties of tin-doped indium oxide films deposited by activated electron beam evaporation Reviewed

    H. Kojima, N. Saito, O. Takai

      Vol. 63 ( 3 ) page: 173-178   2012

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  319. Effects of Crystallization on Internal Stress of ITO Films

    KOJIMA Hiroyasu, SAITO Nagahiro, TAKAI Osamu

    Journal of The Surface Finishing Society of Japan   Vol. 63 ( 4 ) page: .   2012

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Surface Finishing Society of Japan  

    DOI: 10.4139/sfj.63.272

    CiNii Article

  320. ソリューションプラズマによるナノ粒子合成(ヘッドライン:プラズマの新展開-大気圧・液中プラズマ-)

    上野 智永, 齋藤 永宏

    化学と教育   Vol. 60 ( 9 ) page: 376 - 379   2012

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:公益社団法人 日本化学会  

    DOI: 10.20665/kakyoshi.60.9_376

    CiNii Article

  321. Study on the Combustion Inhibition of Poly Phenylene Ether Alloy Reviewed

    Yamashita T, Nakashima E, Takeda K, Saito N, Takai O.

    Kobunshi Ronbunshu   Vol. 69 ( 6 ) page: 297-299   2012

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  322. Rapid synthesis of ordered hexagonal mesoporous silica and their incorporation with Ag nanoparticles by solution plasma Reviewed

    Panuphong Pootawang, Nagahiro Saito, Osamu Takai, Sang Yul Lee

    Materials Research Bulletin   Vol. 47 ( 10 ) page: 2726-2729   2012

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  323. Synthesis and characteristics of Ag/Pt bimetallic nanocomposites by arc-discharge solution plasma processing Reviewed

    P. Pootawang, N. Saito, O. Takai, S. Y. Lee

    Nanotechnology   Vol. 23 ( 39 ) page: 395-602   2012

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  324. Orientation Control of Textured SrTiO3 Thin Films on Platinized Al2O3 (0 0 0 1) by an Ion Beam Sputter Deposition Method Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Journal of Physics D: Applied Physics   Vol. 45 ( 49 ) page: 494003   2012

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  325. The Role of Activated Nitrogen Species on Double-folded Screen Nitriding Process Reviewed

    S. Kim, J. Lee, N. Saito, O. Takai

    Journal of Physics: Conference Series   Vol. 417   page: 012023   2012

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  326. Rapid Synthesis of ordered hexagonal mesoporous silica and their incorporation with Ag nanoparticles by solution plasma Reviewed

    P. Pootawang, N. Saito, O. Takai, S. Y. Lee

    Materials Resarch Bulletin   Vol. 47 ( 10 ) page: 2726-2729   2012

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  327. Enhanced memory window of Au/BaTiO3/SrTiO3/Si(001) MFIS structure with high c-axis orientation for non-volatile memory applications Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Applied Physics A   Vol. 108 ( 2 ) page: 337-342   2012

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  328. Active Species Generated by a Pulsed Arc Electrohydraulic Discharge Plasma Channel in Contaminated Water Treatments +K18:K26 Reviewed

    L. O. Li, N. Takeuchi, Z. He, Y. Guo, K. Yauoka, J. S. Chang, N. Saito

    Plasma Chemistry and Plasma Processing   Vol. 32 ( 2 ) page: 343-358   2012

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  329. Fabrication and characterization of epitaxial SrTiO3/Nb-doped SrTiO3 superlattices by double ECR ion beam sputter deposition Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Vacuum   Vol. 89   page: 35-39   2012

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  330. Rapid Sterilization of Escherichia coli by Solution Plasma Process Reviewed

    N. Andreeva, T. Ishizaki, P. Baroch, N. Saito

    Japanese Journal of Applied Physics   Vol. 51 ( 12 ) page: 126-201   2012

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  331. Effect of substrate temperature on properties of tin-doped indium oxide films deposited by activated electron beam evaporation Reviewed

    H. Kojima, N. Saito, O. Takai

      Vol. 63 ( 3 ) page: 173-178   2012

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  332. Fabrication and characterization of epitaxial SrTiO3/Nb-doped SrTiO3 superlattices by double ECR ion beam sputter deposition Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Vacuum   Vol. 89   page: 35-39   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  333. Enhanced memory window of Au/BaTiO3/SrTiO3/Si(001) MFIS structure with high c-axis orientation for non-volatile memory applications Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Applied Physics A   Vol. 108 ( 2 ) page: 337-342   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  334. Effect of substrate temperature on properties of tin-doped indium oxide films deposited by activated electron beam evaporation Reviewed

    H. Kojima, N. Saito, O. Takai

      Vol. 63 ( 3 ) page: 173-178   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  335. Growth and characterization of highly c-axis textured SrTiO3 thin films directly grown on Si(001) substrates by ion beam sputter deposition Reviewed

    G. Panomsuwan, S. P. Cho, N. Saito, O. Takai

    Crystal Research and Technology   Vol. 47 ( 2 ) page: 187-194   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  336. P-OS7-4 Electronic state control of a lithium ion conductor

    Sawa Kouhei, Bratescu Maria-Antoaneta, Saito Nagahiro

    The Proceedings of the Symposium on Micro-Nano Science and Technology   Vol. 2012 ( 0 ) page: 301 - 302   2012

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    Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    Lithium ion conductor research is determined by an increased demand of energy and by the necessity to develop stable electricity devices for energy accumulation. Recently a great attention was focused on solid type lithium ion batteries which use an inorganic solid electrolyte material with excellent heat and chemical attract resistance. However, generally, the ionic conductivity of a solid electrolyte is low, and has not reached a practical used level. In recent years, the sulfide system solid electrolyte attracts much attention as a material which shows high ion conductivity. In particular, Li_<10>GeP_2S_<12> has been reported to show the highest ion conductivity of 12 mS/cm. The degree of lithium ion conduction in a solid originates in the crystal structure of the material. In this research, the study is made to replace various elements by an ion radius and an electron arrangement paying attention to the above-mentioned material, and the relation between the crystal structure change and the ion conductivity was investigated.

    DOI: 10.1299/jsmemnm.2012.4.301

    CiNii Article

  337. OS7-3-1 Material Synthesis by Solution Plasma Processing

    Ueno Tomonaga, Saito Nagahiro

    The Proceedings of the Symposium on Micro-Nano Science and Technology   Vol. 2012 ( 0 ) page: 53 - 54   2012

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    Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    We have focused a glow discharge in liquid, which is called solution plasma, as a novel material synthesis method. The high energy field, solution plasma, formed in liquid causes to various reactions and it makes possible to fabricate novel materials such as nanoclusters as well as carbon materials. Thus, it can modify surface of the powder such as carbon materials. Since nanoclusters show different properties from bulk material, novel catalyst may be found in nanoclusters. Carbon material is useful for battery electrode. Surface modified filler will be important for composite material. In this matter, solution plasma process has a big possibility as novel material synthesis.

    DOI: 10.1299/jsmemnm.2012.4.53

    CiNii Article

  338. Orientation Control of Textured SrTiO3 Thin Films on Platinized Al2O3 (0 0 0 1) by an Ion Beam Sputter Deposition Method Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Journal of Physics D: Applied Physics   Vol. 45 ( 49 ) page: 494003   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  339. High-rate reactive deposition of SiO2 films using a new DC rotary sputtering cathode Reviewed

    H. Kojima, N. Saito, O. Takai

      Vol. 63 ( 3 ) page: 179-183   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  340. High sensitive detection of volatile organic compounds using superhydrophobic quartz crystal microbalance Reviewed

    N. Andreeva, T. Ishizaki, P. Baroch, N. Saito

    Sensors and Actuators B: Chemical   Vol. 164 ( 1 ) page: 15-21   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  341. P-OS7-5 Synthesis and characterization of Fe-N/C catalyst using solution plasma process

    Tanida Yuya, Pootawang Panuphong, Saito Nagahiro

    The Proceedings of the Symposium on Micro-Nano Science and Technology   Vol. 2012 ( 0 ) page: 303 - 304   2012

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    Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    The development of alternative catalyst with the economical production cost and high catalytic activity instead of Pt-based catalyst for fuel cells is good challenge. It is well known that Fe-N_4/C possesses the catalytic activity for oxygen reduction reaction, with high potential for utilization as cathode. Here, the Fe-N/C particles were synthesized using various precursors by solution plasma process (SPP). In this method, the selection of precursor can control the elemental composition of the synthesized Fe-N/C which affects to the catalytic activity. Pyridine, aniline, pyridine/aniline, and pyridine/triazine as the selected precursors were discharged to form N-carbon particles. In addition, the incorporation of Fe was achieved by the chemical complex of Fe ions. The synthesized Fe-C/N particles were characterized to confirm the elemental composition using elemental analysis. The structural analysis was done by XRD and TEM. Furthermore, the electrocatalytic activity was investigated using cyclic voltammetry under the O_2 and N_2 saturated conditions.

    DOI: 10.1299/jsmemnm.2012.4.303

    CiNii Article

  342. Study on the Combustion Inhibition of Poly Phenylene Ether Alloy Reviewed

    Yamashita T, Nakashima E, Takeda K, Saito N, Takai O

    Kobunshi Ronbunshu   Vol. 69 ( 6 ) page: 297-299   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

    Other Link: http://orcid.org/0000-0001-8757-3933

  343. Rapid synthesis of ordered hexagonal mesoporous silica and their incorporation with Ag nanoparticles by solution plasma Reviewed

    Panuphong Pootawang, Nagahiro Saito, Osamu Takai, Sang Yul Lee

    Materials Research Bulletin   Vol. 47 ( 10 ) page: 2726-2729   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  344. Rapid Synthesis of ordered hexagonal mesoporous silica and their incorporation with Ag nanoparticles by solution plasma Reviewed

    P. Pootawang, N. Saito, O. Takai, S. Y. Lee

    Materials Resarch Bulletin   Vol. 47 ( 10 ) page: 2726-2729   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  345. Rapid Sterilization of Escherichia coli by Solution Plasma Process Reviewed

    N. Andreeva, T. Ishizaki, P. Baroch, N. Saito

    Japanese Journal of Applied Physics   Vol. 51 ( 12 ) page: 126-201   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  346. Preparation of low molecular weight chitosan using solution plasma system Reviewed

    I. Prasertsung, S. Damrongsakku, C. Terashima, N. Saito, O. Takai

    Carbohydrate Polymers   Vol. 87 ( 4 ) page: 2745-2749   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  347. Synthesis and characteristics of Ag/Pt bimetallic nanocomposites by arc-discharge solution plasma processing Reviewed

    P. Pootawang, N. Saito, O. Takai, S. Y. Lee

    Nanotechnology   Vol. 23 ( 39 ) page: 395-602   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  348. アークイオンプレーティング法によるITO膜の内部応力に及ぼす結晶化の影響 Reviewed

    小島啓安, 齋藤永宏, 高井治

    表面技術   Vol. 63 ( 4 ) page: 272-274   2012

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  349. The Role of Activated Nitrogen Species on Double-folded Screen Nitriding Process Reviewed

    S. Kim, J. Lee, N. Saito, O. Takai

    Journal of Physics: Conference Series   Vol. 417   page: 012023   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  350. Effect of substrate temperature on properties of tin-doped indium oxide films deposited by activated electron beam evaporation Reviewed

    H. Kojima, N. Saito, O. Takai

      Vol. 63 ( 3 ) page: 173-178   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  351. High sensitive detection of volatile organic compounds using superhydrophobic quartz crystal microbalance Reviewed

    N. Andreeva, T. Ishizaki, P. Baroch, N. Saito

    Sensors and Actuators B: Chemical   Vol. 164 ( 1 ) page: 15-21   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  352. Growth and characterization of highly c-axis textured SrTiO3 thin films directly grown on Si(001) substrates by ion beam sputter deposition Reviewed

    G. Panomsuwan, S. P. Cho, N. Saito, O. Takai

    Crystal Research and Technology   Vol. 47 ( 2 ) page: 187-194   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  353. Fabrication and characterization of epitaxial SrTiO3/Nb-doped SrTiO3 superlattices by double ECR ion beam sputter deposition Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Vacuum   Vol. 89   page: 35-39   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  354. Enhanced memory window of Au/BaTiO3/SrTiO3/Si(001) MFIS structure with high c-axis orientation for non-volatile memory applications Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Applied Physics A   Vol. 108 ( 2 ) page: 337-342   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  355. Effect of substrate temperature on properties of tin-doped indium oxide films deposited by activated electron beam evaporation Reviewed

    H. Kojima, N. Saito, O. Takai

      Vol. 63 ( 3 ) page: 173-178   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  356. High-rate reactive deposition of SiO2 films using a new DC rotary sputtering cathode Reviewed

    H. Kojima, N. Saito, O. Takai

      Vol. 63 ( 3 ) page: 179-183   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  357. Rapid synthesis of ordered hexagonal mesoporous silica and their incorporation with Ag nanoparticles by solution plasma Reviewed

    Panuphong Pootawang, Nagahiro Saito, Osamu Takai, Sang Yul Lee

    Materials Research Bulletin   Vol. 47 ( 10 ) page: 2726-2729   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  358. Rapid Synthesis of ordered hexagonal mesoporous silica and their incorporation with Ag nanoparticles by solution plasma Reviewed

    P. Pootawang, N. Saito, O. Takai, S. Y. Lee

    Materials Resarch Bulletin   Vol. 47 ( 10 ) page: 2726-2729   2012

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    Language:English   Publishing type:Research paper (scientific journal)  

  359. Rapid Sterilization of Escherichia coli by Solution Plasma Process Reviewed

    N. Andreeva, T. Ishizaki, P. Baroch, N. Saito

    Japanese Journal of Applied Physics   Vol. 51 ( 12 ) page: 126-201   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  360. P-OS7-5 Synthesis and characterization of Fe-N/C catalyst using solution plasma process

    Tanida Yuya, Pootawang Panuphong, Saito Nagahiro

    The Proceedings of the Symposium on Micro-Nano Science and Technology   Vol. 2012 ( 0 ) page: 303 - 304   2012

     More details

    Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    The development of alternative catalyst with the economical production cost and high catalytic activity instead of Pt-based catalyst for fuel cells is good challenge. It is well known that Fe-N_4/C possesses the catalytic activity for oxygen reduction reaction, with high potential for utilization as cathode. Here, the Fe-N/C particles were synthesized using various precursors by solution plasma process (SPP). In this method, the selection of precursor can control the elemental composition of the synthesized Fe-N/C which affects to the catalytic activity. Pyridine, aniline, pyridine/aniline, and pyridine/triazine as the selected precursors were discharged to form N-carbon particles. In addition, the incorporation of Fe was achieved by the chemical complex of Fe ions. The synthesized Fe-C/N particles were characterized to confirm the elemental composition using elemental analysis. The structural analysis was done by XRD and TEM. Furthermore, the electrocatalytic activity was investigated using cyclic voltammetry under the O_2 and N_2 saturated conditions.

    DOI: 10.1299/jsmemnm.2012.4.303

    CiNii Article

  361. P-OS7-4 Electronic state control of a lithium ion conductor

    Sawa Kouhei, Bratescu Maria-Antoaneta, Saito Nagahiro

    The Proceedings of the Symposium on Micro-Nano Science and Technology   Vol. 2012 ( 0 ) page: 301 - 302   2012

     More details

    Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    Lithium ion conductor research is determined by an increased demand of energy and by the necessity to develop stable electricity devices for energy accumulation. Recently a great attention was focused on solid type lithium ion batteries which use an inorganic solid electrolyte material with excellent heat and chemical attract resistance. However, generally, the ionic conductivity of a solid electrolyte is low, and has not reached a practical used level. In recent years, the sulfide system solid electrolyte attracts much attention as a material which shows high ion conductivity. In particular, Li_<10>GeP_2S_<12> has been reported to show the highest ion conductivity of 12 mS/cm. The degree of lithium ion conduction in a solid originates in the crystal structure of the material. In this research, the study is made to replace various elements by an ion radius and an electron arrangement paying attention to the above-mentioned material, and the relation between the crystal structure change and the ion conductivity was investigated.

    DOI: 10.1299/jsmemnm.2012.4.301

    CiNii Article

  362. OS7-3-1 Material Synthesis by Solution Plasma Processing

    Ueno Tomonaga, Saito Nagahiro

    The Proceedings of the Symposium on Micro-Nano Science and Technology   Vol. 2012 ( 0 ) page: 53 - 54   2012

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    Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    We have focused a glow discharge in liquid, which is called solution plasma, as a novel material synthesis method. The high energy field, solution plasma, formed in liquid causes to various reactions and it makes possible to fabricate novel materials such as nanoclusters as well as carbon materials. Thus, it can modify surface of the powder such as carbon materials. Since nanoclusters show different properties from bulk material, novel catalyst may be found in nanoclusters. Carbon material is useful for battery electrode. Surface modified filler will be important for composite material. In this matter, solution plasma process has a big possibility as novel material synthesis.

    DOI: 10.1299/jsmemnm.2012.4.53

    CiNii Article

  363. Orientation Control of Textured SrTiO3 Thin Films on Platinized Al2O3 (0 0 0 1) by an Ion Beam Sputter Deposition Method Reviewed

    G. Panomsuwan, O. Takai, N. Saito

    Journal of Physics D: Applied Physics   Vol. 45 ( 49 ) page: 494003   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  364. Study on the Combustion Inhibition of Poly Phenylene Ether Alloy Reviewed

    Yamashita T, Nakashima E, Takeda K, Saito N, Takai O

    Kobunshi Ronbunshu   Vol. 69 ( 6 ) page: 297-299   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Other Link: http://orcid.org/0000-0001-8757-3933

  365. The Role of Activated Nitrogen Species on Double-folded Screen Nitriding Process Reviewed

    S. Kim, J. Lee, N. Saito, O. Takai

    Journal of Physics: Conference Series   Vol. 417   page: 012023   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  366. Synthesis and characteristics of Ag/Pt bimetallic nanocomposites by arc-discharge solution plasma processing Reviewed

    P. Pootawang, N. Saito, O. Takai, S. Y. Lee

    Nanotechnology   Vol. 23 ( 39 ) page: 395-602   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  367. アークイオンプレーティング法によるITO膜の内部応力に及ぼす結晶化の影響 Reviewed

    小島啓安, 齋藤永宏, 高井治

    表面技術   Vol. 63 ( 4 ) page: 272-274   2012

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  368. Size-Controlled Gold Nanoparticles Synthesized in Solution Plasma Reviewed

    Maria Antoaneta Bratescu, Sung-Pyo Cho, Osamu Takai, Nagahiro Saito

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 115 ( 50 ) page: 24569 - 24576   2011.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Size-controlled gold nanoparticles (NPs) have been synthesized using an electrical discharge in a liquid environment, termed solution plasma processing (SPP). The gold NPs exhibit sizes from 1 to 2 to 10 nm when the solution pH was adjusted in the range from 12 to 3, respectively. The chemical environment surrounding the gold NPs depends on the preparation conditions and determines the electrostatic interaction among the nanoparticles,. which alters their final size. Information obtained from XPS analysis, ToF-SIMS mass spectra, and UV-vis absorption spectroscopy were consistent and demonstrate that the gold NPs are partially oxidized on the surface, when synthesized in a pH 12 solution, and remain surrounded by gold chloride compounds when synthesized in a pH 3 solution. Plasma diagnostics shows that a high electron density contributes to generating a larger number of hydrogen radicals, which represent the main component in the reduction process of the gold ion into the neutral form.

    DOI: 10.1021/jp207447c

    Web of Science

  369. Wettability characterization of transparent MgF2 nanoparticle coatings with SiO2 binder covered with fluoroalkylsilane self-assembled monolayers Reviewed

    Tsuyoshi Murata, Junko Hieda, Nagahiro Saito, Osamu Takai

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   Vol. 60 ( 2 ) page: 125 - 130   2011.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    SiO2-added MgF2 nanoparticle coatings with various surface roughness properties were formed on silica-glass substrates from autoclaved sols prepared at 100-180 degrees C. The samples were exposed to fluoro-alkyl silane (FAS) vapor to give hydrophobicity. All nanoparticle samples before FAS treatment had transmittances higher than 93% and such values were preserved even after FAS treatment. We examined root mean square roughnesses of the nanoparticle coatings with a Scanning Probe Microscope. We also examined their static and dynamic wettabilities with a contact angle meter and calculated their adhesive energies and surface free energies (SFEs). The surface roughness of the nanoparticle coating increased with the increase of the autoclave temperature. In addition, higher autoclave temperature caused increases in the sliding angle and decreases in the SFE. Interestingly, the higher the contact angle was, the larger the sliding angle was, although smaller sliding angle was expected with a larger contact angle.

    DOI: 10.1007/s10971-011-2566-9

    Web of Science

  370. Effect of the electrode work function on the water plasma breakdown voltage

    Miron C., Bratescu M. A., Saito N., Takai O.

    CURRENT APPLIED PHYSICS   Vol. 11 ( 5 ) page: S154 - S158   2011.9

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    DOI: 10.1016/j.cap.2011.04.005

    Web of Science

  371. Redox reactions in liquid plasma during iron oxide and oxide-hydroxide nanoparticles synthesis

    Bratescu M. A., Saito N., Takai O.

    CURRENT APPLIED PHYSICS   Vol. 11 ( 5 ) page: S30 - S34   2011.9

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    DOI: 10.1016/j.cap.2011.06.007

    Web of Science

  372. Effect of the electrode work function on the water plasma breakdown voltage

    Miron C., Bratescu M. A., Saito N., Takai O.

    CURRENT APPLIED PHYSICS   Vol. 11 ( 5 ) page: S154 - S158   2011.9

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.cap.2011.04.005

    Web of Science

  373. Redox reactions in liquid plasma during iron oxide and oxide-hydroxide nanoparticles synthesis

    Bratescu M. A., Saito N., Takai O.

    CURRENT APPLIED PHYSICS   Vol. 11 ( 5 ) page: S30 - S34   2011.9

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.cap.2011.06.007

    Web of Science

  374. Synthesis of Gold Nanoparticles on Petal-shaped Silica by Solution Plasma

    YAMAMOTO Taibou, TANABE Fumi, TAKAI Osamu, SAITO Nagahiro

    Journal of The Surface Finishing Society of Japan   Vol. 62 ( 8 ) page: 413 - 415   2011.8

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Surface Finishing Society of Japan  

    DOI: 10.4139/sfj.62.413

    CiNii Article

  375. Solution plasma for template removal in mesoporous silica: pH and discharge time varying characteristics

    Pootawang Panuphong, Saito Nagahiro, Takai Osamu

    THIN SOLID FILMS   Vol. 519 ( 20 ) page: 7030 - 7035   2011.8

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    DOI: 10.1016/j.tsf.2011.01.213

    Web of Science

  376. Solution plasma for template removal in mesoporous silica: pH and discharge time varying characteristics

    Pootawang Panuphong, Saito Nagahiro, Takai Osamu

    THIN SOLID FILMS   Vol. 519 ( 20 ) page: 7030 - 7035   2011.8

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    DOI: 10.1016/j.tsf.2011.01.213

    Web of Science

  377. Adhesion property of SiOx-doped Diamond-like Carbon Films Deposited on Polycarbonate by Inductively Coupled Plasma Chemical Vapor Deposition

    Baek Sang-min, Shirafuji Tatsuru, Saito Nagahiro, Takai Osamu

    THIN SOLID FILMS   Vol. 519 ( 20 ) page: 6678 - 6682   2011.8

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    DOI: 10.1016/j.tsf.2011.04.080

    Web of Science

  378. Wettability of MgF2 porous nanoparticle layers covered with fluoroalkylsilane self-assembled monolayer

    Murata Tsuyoshi, Hieda Junko, Saito Nagahiro, Takai Osamu

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 119 ( 1391 ) page: 591 - 594   2011.7

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    Publishing type:Research paper (scientific journal)   Publisher:公益社団法人 日本セラミックス協会  

    MgF<sub>2</sub> porous nanoparticle coatings with SiO<sub>2</sub> binder were formed on glass substrates by solgel method. The samples were exposed to fluoro-alkyl silane (FAS) vapor and heated at 150&deg;C to give water repellency. We measured surface roughnesses and static contact angles of water of the samples and examined the relation between surface roughnesses and contact angles. Scanning Probe Microscopy (SPM) confirmed that the FAS treatment had no effect on the surface roughness. In the autoclave temperature region of 100&ndash;180&deg;C, the higher the autoclave temperature was, the larger the surface roughness was. The sample prepared from the 100&deg;C autoclaved sol had the minimum surface roughness of 4.1 nm and showed the minimum static contact angle of 115&deg;. On the other hand, the sample prepared from the 180&deg;C autoclaved sol had the maximum surface roughness of 9.5 nm and showed the maximum static contact angle of 134&deg;.

    DOI: 10.2109/jcersj2.119.591

    Web of Science

    CiNii Article

  379. Wettability of MgF2 porous nanoparticle layers covered with fluoroalkylsilane self-assembled monolayer

    Murata Tsuyoshi, Hieda Junko, Saito Nagahiro, Takai Osamu

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 119 ( 1391 ) page: 591 - 594   2011.7

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    Publishing type:Research paper (scientific journal)   Publisher:公益社団法人 日本セラミックス協会  

    MgF<sub>2</sub> porous nanoparticle coatings with SiO<sub>2</sub> binder were formed on glass substrates by solgel method. The samples were exposed to fluoro-alkyl silane (FAS) vapor and heated at 150&deg;C to give water repellency. We measured surface roughnesses and static contact angles of water of the samples and examined the relation between surface roughnesses and contact angles. Scanning Probe Microscopy (SPM) confirmed that the FAS treatment had no effect on the surface roughness. In the autoclave temperature region of 100&ndash;180&deg;C, the higher the autoclave temperature was, the larger the surface roughness was. The sample prepared from the 100&deg;C autoclaved sol had the minimum surface roughness of 4.1 nm and showed the minimum static contact angle of 115&deg;. On the other hand, the sample prepared from the 180&deg;C autoclaved sol had the maximum surface roughness of 9.5 nm and showed the maximum static contact angle of 134&deg;.

    DOI: 10.2109/jcersj2.119.591

    Web of Science

    CiNii Article

  380. Optical diagnostic of bipolar electrical discharges in HCl, KCl, and KOH solutions

    Miron C., Bratescu M. A., Saito N., Takai O.

    JOURNAL OF APPLIED PHYSICS   Vol. 109 ( 12 )   2011.6

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    DOI: 10.1063/1.3597790

    Web of Science

  381. Optical diagnostic of bipolar electrical discharges in HCl, KCl, and KOH solutions

    Miron C., Bratescu M. A., Saito N., Takai O.

    JOURNAL OF APPLIED PHYSICS   Vol. 109 ( 12 )   2011.6

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.3597790

    Web of Science

  382. Analysis of organic pollutant degradation in pulsed plasma by coherent anti-Stokes Raman spectroscopy Reviewed

    Maria Antoneta Bratescu, Junko Hieda, Tomonari Umemura, Nagahiro Saito, Osamu Takai

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A   Vol. 29 ( 3 ) page: -   2011.5

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    Publishing type:Research paper (scientific journal)   Publisher:A V S AMER INST PHYSICS  

    The degradation of p-benzoquinone (p-BQ) in water was investigated by the coherent anti-Stokes Raman spectroscopy (CARS0 method, in which the change of the anti-Stokes signal intensity corresponding to the vibrational transitions of the molecule is monitored during and after solution plasma processing (SPP). In the beginning of SPP treatment, the CARS signal intensity of the ring vibrational molecular transitions at 1233 and 1660 cm(-1) increases under the influence of the electric field of the plasma, depending on the delay time between the plasma pulse and the laser firing pulse. At the same time, the plasma contributes to the degradation of p-BQ molecules by generating hydrogen and hydroxyl radicals, which decompose p-BQ into different carboxylic acids. After SPP, the CARS signal intensity of the vibrational bands of p-BQ ceased and the degradation of p-BQ was confirmed by UV-visible absorption spectroscopy and liquid chromatography analysis. (C) 2011 American Vacuum Society. [DOI: 10.1116/1.3569035]

    DOI: 10.1116/1.3569035

    Web of Science

  383. Ag nanoparticle incorporation in mesoporous silica synthesized by solution plasma and their catalysis for oleic acid hydrogenation Reviewed

    Panuphong Pootawang, Nagahiro Saito, Osamu Takai

    MATERIALS LETTERS   Vol. 65 ( 6 ) page: 1037 - 1040   2011.3

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    Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    The incorporation of Ag nanoparticles on mesoporous silica as the supporting material and their catalysis for oleic acid hydrogenation were described in this study. The template removal and Ag nanoparticle incorporation were concurrently taken place in the novel glow discharge in a solution, namely solution plasma process under controlled conditions. With only 15 min of discharge time, Ag nanoparticles were incorporated on the mesoporous silica matrix confirmed by the evidences of XRD and TEM and the template inside mesopores was mostly removed confirmed by FTIR spectra. The hydrogenation catalysis of oleic acid was preliminarily tested using UV-VIS spectroscopy after oxidation using permanganate ions (MnO4-). It was found that the conversion was observed to be 12.83% in the butanol system and reached to 90.56% in ethanol. (c) 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.matlet.2011.01.009

    Web of Science

  384. WANTS-NEEDS-SEEDS 植物由来の普通紙にはっ水性と抗菌性を付与する処理技術の開発

    石崎 貴裕, 齋藤 永宏, 高井 治

    未来材料   Vol. 11 ( 2 ) page: 52-54   2011.2

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  385. Structural Properties and Microstructures of SrTiO3/SrTi1-xNbxO3 Superlattices Grown by Ion Beam Deposition Reviewed

    G. Panomsuwan, N. Saito, O. Takai

    Materials Science Forum   Vol. 695   page: 598-601   2011

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  386. Solution plasma for template removal in mesoporous silica: pH and discharge time varying characteristics Reviewed

    P. Pootawang,N. Saito, O. Takai

    Thin Solid Films   Vol. 519 ( 20 ) page: 7030-7035   2011

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  387. ソリューションプラズマによる花弁状シリカの合成 Reviewed

    山本泰望, 田辺郁, 高井治, 齋藤永宏

    表面技術   Vol. 62 ( 8 ) page: 413-415   2011

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  388. Wettability of MgF(2) porous nanoparticle layers covered with fluoroalkylsilane self-assembled monolayer Reviewed

    T. Murata, J. Hieda, N. Saito, O. Takai

    Journal of the Ceramic Society of Japan   Vol. 119 ( 1391 ) page: 591-594   2011

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  389. Adhesion property of SiO(x)-doped Diamond-like Carbon Films Deposited on Polycarbonate by Inductively Coupled Plasma Chemical Vapor Deposition Reviewed

    S. M. Baek, T. Shirafuji,N. Saito, O. Takai.

    Thin Solid Films   Vol. 519 ( 20 ) page: 6678-6682   2011

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  390. Fabrication of Transparent Protective Diamond-Like Carbon Films on Polymer Reviewed

    S. M. Baek,T. Shirafuji,N. Saito, O. Takai

    Japanese Journal of Applied Physics   Vol. 50 ( 8 ) page: 08JD08-08JD08-5   2011

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  391. Generation of plasmas in water: utilization of a high-frequency, low-voltage bipolar pulse power supply with impedance control Reviewed

    P. Baroch, P. Potochy,N.Saito

    Plasma Sources Sci. Technol.   Vol. 20   page: 034017   2011

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  392. Size-Controlled Gold Nanoparticles Synthesized in Solution Plasma Reviewed

    M. A. Bratescu Maria , S.-P. Cho,O. Takai, N. Saito

    The Journal of Physical Chemistry C   Vol. 115 ( 50 ) page: 24569-24576   2011

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  393. Redox reactions in liquid plasma during iron oxide and oxide-hydroxide nanoparticles synthesis Reviewed

    M. A. Bratescu,N. Saito, O.Takai.

    Current Applied Physics   Vol. 11 ( 5 ) page: S30-S34   2011

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  394. Microstructural characterization of gold nanoparticles synthesized by solution plasma processing Reviewed

    S. P. Cho, M. A. Bratescu,N. Saito, O. Takai.

    Nanotechnology   Vol. 22 ( 45 ) page: 455701   2011

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  395. Rapid Synthesis and Structural Characterization of Well-Defined Gold Clusters by Solution Plasma Sputtering Reviewed

    X. Hu, S. P. Cho, O. Takai, N. Saito

    Crystal Growth & Design   Vol. 12 ( 1 ) page: 119-123   2011

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  396. Low-Temperature Fabrication of Bunch-Shaped ZnO Nanowires Using a Sodium Hydroxide Aqueous Solution Reviewed

    X. Hu, Y. Masuda, T. Ohji, N. Saito, K. Kato

    Journal of Nanoscience and Nanotechnology   Vol. 11 ( 12 ) page: 10935-10939   2011

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  397. Effect of the electrode work function on the water plasma breakdown voltage Reviewed

    C. Miron, M. A. Bratescu, N. Saito,O. Takai

    Current Applied Physics   Vol. 11 ( 5 ) page: S154-S158   2011

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  398. Optical diagnostic of bipolar electrical discharges in HCl, KCl, and KOH solutions Reviewed

    C. Miron,M. A. Bratescu, N. Saito,O. Takai

    Journal of Applied Physics   Vol. 109 ( 12 ) page: 123301   2011

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  399. Wettability characterization of transparent MgF(2) nanoparticle coatings with SiO(2) binder covered with fluoroalkylsilane self-assembled monolayers Reviewed

    T. Murata, J. Hieda, N. Saito, O. Takai

    Journal of Sol-Gel Science and Technology   Vol. 60 ( 2 ) page: 125-130   2011

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  400. Ag Nanoparticles Incorporation in Mesoporous Silica Synthesized by Solution Plasma and their Catalysis for Oleic Acid Hydrogenation

    P. Pootawang, N. Saito, O. Takai

    Materials Letters   Vol. 65   page: 1037-1040]   2011

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  401. Fabrication of Vertically Aligned Diamond Whiskers from Highly Boron-Doped Diamond by Oxygen Plasma Etching

    C. Terashima, K. Arihara, S. Okazaki, T. Shichi, D.A. Tryk, T. Shirafuji, N. Saito, O. Takai, A. Fujishima

    ACS Applied Materials & Interfaces   Vol. 3   page: 177-182   2011

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  402. Adhesion property of SiO(x)-doped Diamond-like Carbon Films Deposited on Polycarbonate by Inductively Coupled Plasma Chemical Vapor Deposition Reviewed

    S. M. Baek, T. Shirafuji, N. Saito, O. Takai

    Thin Solid Films   Vol. 519 ( 20 ) page: 6678-6682   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  403. Fabrication of Transparent Protective Diamond-Like Carbon Films on Polymer Reviewed

    S. M. Baek, T. Shirafuji, N. Saito, O. Takai

    Japanese Journal of Applied Physics   Vol. 50 ( 8 ) page: 08JD08-08JD08-5   2011

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  404. Effect of the electrode work function on the water plasma breakdown voltage Reviewed

    C. Miron, M. A. Bratescu, N. Saito, O. Takai

    Current Applied Physics   Vol. 11 ( 5 ) page: S154-S158   2011

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  405. Creating Biointerface on Polymer by Plasma-Initiated Graft Polymerization

    Andreeva Nina, Ishizaki Takahiro, Baroch Pavel, Saito Nagahiro

    Transactions of the Materials Research Society of Japan   Vol. 36 ( 4 ) page: 549 - 552   2011

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    Hydrophilic modification of polyethylene terephthalate (PET) was successfully demonstrated by surface wave plasma treatment followed by graft polymerization with various monomers such as acrylic acid (AA), (2-hydroxyethyl) methacrylate (HEMA), and styrene (St) in the vapor phase. The plasma treatment did not physically damage the PET surface. The graft reactions were confirmed by water contact angle measurements and X-ray photoelectron spectroscopy (XPS). The water contact angles of the PET surface modified with hydrophilic AA and HEMA monomers decreased from approximately 80° before treatment to less than 35°, and the hydrophilicity of the PET surface modified by hydrophilic AA and HEMA monomers was maintained for 70 h. 3T3 fibroblast cells were cultured on the modified PET surfaces to investigate the bioactivity of the modified PET surfaces.

    DOI: 10.14723/tmrsj.36.549

    CiNii Article

  406. Ag Nanoparticles Incorporation in Mesoporous Silica Synthesized by Solution Plasma and their Catalysis for Oleic Acid Hydrogenation

    P. Pootawang, N. Saito, O. Takai

    Materials Letters   Vol. 65   page: 1037-1040]   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  407. Fabrication of Vertically Aligned Diamond Whiskers from Highly Boron-Doped Diamond by Oxygen Plasma Etching

    C. Terashima, K. Arihara, S. Okazaki, T. Shichi, D.A. Tryk, T. Shirafuji, N. Saito, O. Takai, A. Fujishima

    ACS Applied Materials & Interfaces   Vol. 3   page: 177-182   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  408. Optical diagnostic of bipolar electrical discharges in HCl, KCl, and KOH solutions Reviewed

    C. Miron, M. A. Bratescu, N. Saito, O. Takai

    Journal of Applied Physics   Vol. 109 ( 12 ) page: 123301   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  409. Microstructural characterization of gold nanoparticles synthesized by solution plasma processing Reviewed

    S. P. Cho, M. A. Bratescu, N. Saito, O. Takai

    Nanotechnology   Vol. 22 ( 45 ) page: 455701   2011

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  410. Low-Temperature Fabrication of Bunch-Shaped ZnO Nanowires Using a Sodium Hydroxide Aqueous Solution Reviewed

    X. Hu, Y. Masuda, T. Ohji, N. Saito, K. Kato

    Journal of Nanoscience and Nanotechnology   Vol. 11 ( 12 ) page: 10935-10939   2011

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  411. Generation of plasmas in water: utilization of a high-frequency, low-voltage bipolar pulse power supply with impedance control Reviewed

    P. Baroch, P. Potochy, N.Saito

    Plasma Sources Sci. Technol.   Vol. 20   page: 034017   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  412. Rapid Synthesis and Structural Characterization of Well-Defined Gold Clusters by Solution Plasma Sputtering Reviewed

    X. Hu, S. P. Cho, O. Takai, N. Saito

    Crystal Growth & Design   Vol. 12 ( 1 ) page: 119-123   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  413. Structural Properties and Microstructures of SrTiO3/SrTi1-xNbxO3 Superlattices Grown by Ion Beam Deposition Reviewed

    G. Panomsuwan, N. Saito, O. Takai

    Materials Science Forum   Vol. 695   page: 598-601   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  414. Solution plasma for template removal in mesoporous silica: pH and discharge time varying characteristics Reviewed

    P. Pootawang, N. Saito, O. Takai

    Thin Solid Films   Vol. 519 ( 20 ) page: 7030-7035   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  415. Size-Controlled Gold Nanoparticles Synthesized in Solution Plasma Reviewed

    M. A, Bratescu Maria, S.-P. Cho, O. Takai, N. Saito

    The Journal of Physical Chemistry C   Vol. 115 ( 50 ) page: 24569-24576   2011

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  416. Regulatory mechanisms of Rac activation by RhoGDI

    Ueyama Takehiko, Son Jeonghyun, Kobayashi Takeshi, Saito Naoaki

    JOURNAL OF PHARMACOLOGICAL SCIENCES   Vol. 115   page: 29P - 29P   2011

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    Web of Science

  417. Redox reactions in liquid plasma during iron oxide and oxide-hydroxide nanoparticles synthesis Reviewed

    M. A. Bratescu, N. Saito, O.Takai

    Current Applied Physics   Vol. 11 ( 5 ) page: S30-S34   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  418. Wettability characterization of transparent MgF(2) nanoparticle coatings with SiO(2) binder covered with fluoroalkylsilane self-assembled monolayers Reviewed

    T. Murata, J. Hieda, N. Saito, O. Takai

    Journal of Sol-Gel Science and Technology   Vol. 60 ( 2 ) page: 125-130   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  419. Ag Nanoparticles Incorporation in Mesoporous Silica Synthesized by Solution Plasma and their Catalysis for Oleic Acid Hydrogenation

    P. Pootawang, N. Saito, O. Takai

    Materials Letters   Vol. 65   page: 1037-1040]   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  420. Adhesion property of SiO(x)-doped Diamond-like Carbon Films Deposited on Polycarbonate by Inductively Coupled Plasma Chemical Vapor Deposition Reviewed

    S. M. Baek, T. Shirafuji, N. Saito, O. Takai

    Thin Solid Films   Vol. 519 ( 20 ) page: 6678-6682   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  421. ソリューションプラズマによる花弁状シリカの合成 Reviewed

    山本泰望, 田辺郁, 高井治, 齋藤永宏

    表面技術   Vol. 62 ( 8 ) page: 413-415   2011

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  422. Wettability of MgF(2) porous nanoparticle layers covered with fluoroalkylsilane self-assembled monolayer Reviewed

    T. Murata, J. Hieda, N. Saito, O. Takai

    Journal of the Ceramic Society of Japan   Vol. 119 ( 1391 ) page: 591-594   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  423. Creating Biointerface on Polymer by Plasma-Initiated Graft Polymerization

    Andreeva Nina, Ishizaki Takahiro, Baroch Pavel, Saito Nagahiro

    Transactions of the Materials Research Society of Japan   Vol. 36 ( 4 ) page: 549 - 552   2011

     More details

    Publishing type:Research paper (scientific journal)   Publisher:一般社団法人 日本MRS  

    Hydrophilic modification of polyethylene terephthalate (PET) was successfully demonstrated by surface wave plasma treatment followed by graft polymerization with various monomers such as acrylic acid (AA), (2-hydroxyethyl) methacrylate (HEMA), and styrene (St) in the vapor phase. The plasma treatment did not physically damage the PET surface. The graft reactions were confirmed by water contact angle measurements and X-ray photoelectron spectroscopy (XPS). The water contact angles of the PET surface modified with hydrophilic AA and HEMA monomers decreased from approximately 80° before treatment to less than 35°, and the hydrophilicity of the PET surface modified by hydrophilic AA and HEMA monomers was maintained for 70 h. 3T3 fibroblast cells were cultured on the modified PET surfaces to investigate the bioactivity of the modified PET surfaces.

    DOI: 10.14723/tmrsj.36.549

    CiNii Article

  424. Generation of plasmas in water: utilization of a high-frequency, low-voltage bipolar pulse power supply with impedance control Reviewed

    P. Baroch, P. Potochy, N.Saito

    Plasma Sources Sci. Technol.   Vol. 20   page: 034017   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  425. Fabrication of Vertically Aligned Diamond Whiskers from Highly Boron-Doped Diamond by Oxygen Plasma Etching

    C. Terashima, K. Arihara, S. Okazaki, T. Shichi, D.A. Tryk, T. Shirafuji, N. Saito, O. Takai, A. Fujishima

    ACS Applied Materials & Interfaces   Vol. 3   page: 177-182   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  426. Fabrication of Transparent Protective Diamond-Like Carbon Films on Polymer Reviewed

    S. M. Baek, T. Shirafuji, N. Saito, O. Takai

    Japanese Journal of Applied Physics   Vol. 50 ( 8 ) page: 08JD08-08JD08-5   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  427. Effect of the electrode work function on the water plasma breakdown voltage Reviewed

    C. Miron, M. A. Bratescu, N. Saito, O. Takai

    Current Applied Physics   Vol. 11 ( 5 ) page: S154-S158   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  428. Low-Temperature Fabrication of Bunch-Shaped ZnO Nanowires Using a Sodium Hydroxide Aqueous Solution Reviewed

    X. Hu, Y. Masuda, T. Ohji, N. Saito, K. Kato

    Journal of Nanoscience and Nanotechnology   Vol. 11 ( 12 ) page: 10935-10939   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  429. Redox reactions in liquid plasma during iron oxide and oxide-hydroxide nanoparticles synthesis Reviewed

    M. A. Bratescu, N. Saito, O.Takai

    Current Applied Physics   Vol. 11 ( 5 ) page: S30-S34   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  430. Rapid Synthesis and Structural Characterization of Well-Defined Gold Clusters by Solution Plasma Sputtering Reviewed

    X. Hu, S. P. Cho, O. Takai, N. Saito

    Crystal Growth & Design   Vol. 12 ( 1 ) page: 119-123   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  431. Optical diagnostic of bipolar electrical discharges in HCl, KCl, and KOH solutions Reviewed

    C. Miron, M. A. Bratescu, N. Saito, O. Takai

    Journal of Applied Physics   Vol. 109 ( 12 ) page: 123301   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  432. Microstructural characterization of gold nanoparticles synthesized by solution plasma processing Reviewed

    S. P. Cho, M. A. Bratescu, N. Saito, O. Takai

    Nanotechnology   Vol. 22 ( 45 ) page: 455701   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  433. Regulatory mechanisms of Rac activation by RhoGDI

    Ueyama Takehiko, Son Jeonghyun, Kobayashi Takeshi, Saito Naoaki

    JOURNAL OF PHARMACOLOGICAL SCIENCES   Vol. 115   page: 29P - 29P   2011

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    Publishing type:Research paper (scientific journal)  

    Web of Science

  434. Wettability of MgF(2) porous nanoparticle layers covered with fluoroalkylsilane self-assembled monolayer Reviewed

    T. Murata, J. Hieda, N. Saito, O. Takai

    Journal of the Ceramic Society of Japan   Vol. 119 ( 1391 ) page: 591-594   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  435. Wettability characterization of transparent MgF(2) nanoparticle coatings with SiO(2) binder covered with fluoroalkylsilane self-assembled monolayers Reviewed

    T. Murata, J. Hieda, N. Saito, O. Takai

    Journal of Sol-Gel Science and Technology   Vol. 60 ( 2 ) page: 125-130   2011

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  436. Structural Properties and Microstructures of SrTiO3/SrTi1-xNbxO3 Superlattices Grown by Ion Beam Deposition Reviewed

    G. Panomsuwan, N. Saito, O. Takai

    Materials Science Forum   Vol. 695   page: 598-601   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  437. Solution plasma for template removal in mesoporous silica: pH and discharge time varying characteristics Reviewed

    P. Pootawang, N. Saito, O. Takai

    Thin Solid Films   Vol. 519 ( 20 ) page: 7030-7035   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  438. Size-Controlled Gold Nanoparticles Synthesized in Solution Plasma Reviewed

    M. A, Bratescu Maria, S.-P. Cho, O. Takai, N. Saito

    The Journal of Physical Chemistry C   Vol. 115 ( 50 ) page: 24569-24576   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  439. ソリューションプラズマによる花弁状シリカの合成 Reviewed

    山本泰望, 田辺郁, 高井治, 齋藤永宏

    表面技術   Vol. 62 ( 8 ) page: 413-415   2011

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  440. Attenuated total reflectance spectroscopy of coumarin organosilane molecules adsorbed on a fused silica surface

    Bratescu Maria Antoaneta, Saito Nagahiro, Takai Osamu

    APPLIED SURFACE SCIENCE   Vol. 257 ( 5 ) page: 1792 - 1799   2010.12

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    DOI: 10.1016/j.apsusc.2010.09.019

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  441. Attenuated total reflectance spectroscopy of coumarin organosilane molecules adsorbed on a fused silica surface

    Bratescu Maria Antoaneta, Saito Nagahiro, Takai Osamu

    APPLIED SURFACE SCIENCE   Vol. 257 ( 5 ) page: 1792 - 1799   2010.12

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    DOI: 10.1016/j.apsusc.2010.09.019

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  442. Plasma antisepsis/sterilization (8) Sterilization of bacteria in water with solution plasma

      Vol. 38 ( 11 ) page: 763 - 768   2010.11

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  443. Systems and Their Characteristics for Plasma Source in Plasma Antisepsis

    SHIRAFUJI Tatsuru, SAITO Nagahiro, TAKAI Osamu

      Vol. 38 ( 10 ) page: 679 - 685   2010.10

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  444. Synthesis of nanoparticles and surface functionalization using solution plasma Reviewed

      Vol. 61 ( 10 ) page: 802-806   2010.10

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  445. Time-resolved Optical Emission Spectroscopy in Water Electrical Discharges

    Miron C., Bratescu M. A., Saito N., Takai O.

    PLASMA CHEMISTRY AND PLASMA PROCESSING   Vol. 30 ( 5 ) page: 619 - 631   2010.10

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    DOI: 10.1007/s11090-010-9248-1

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  446. Oxygen Gas Barrier Properties of Hydrogenated Amorphous Carbon Thin Films Deposited with a Pulse-Biased Inductively Coupled Plasma Chemical Vapor Deposition Method

    Baek Sang-min, Shirafuji Tatsuru, Cho Sung-pyo, Saito Nagahiro, Takai Osamu

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 49 ( 8 )   2010.8

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    DOI: 10.1143/JJAP.49.08JF10

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  447. Oxygen Gas Barrier Properties of Hydrogenated Amorphous Carbon Thin Films Deposited with a Pulse-Biased Inductively Coupled Plasma Chemical Vapor Deposition Method

    Baek Sang-min, Shirafuji Tatsuru, Cho Sung-pyo, Saito Nagahiro, Takai Osamu

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 49 ( 8 )   2010.8

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    DOI: 10.1143/JJAP.49.08JF10

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  448. Fabrication and Application of Super-Hydrophobic Surface

    TAKAI Osamu, ISHIZAKI Takahiro, SAITO Nagahiro

    Journal of Japanese Society of Tribologists   Vol. 55 ( 4 ) page: 254 - 259   2010.4

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  449. TonEBP regulates hyperosmolality-induced arginine vasotocin gene expression in the chick (Gallus domesticus)

    Saito Noboru, Fujii Mariko, Sugiura Kanae, Aste Nicoletta, Shimada Kiyoshi

    NEUROSCIENCE LETTERS   Vol. 468 ( 3 ) page: 334 - 338   2010.1

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    DOI: 10.1016/j.neulet.2009.11.027

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  450. TonEBP regulates hyperosmolality-induced arginine vasotocin gene expression in the chick (Gallus domesticus)

    Saito Noboru, Fujii Mariko, Sugiura Kanae, Aste Nicoletta, Shimada Kiyoshi

    NEUROSCIENCE LETTERS   Vol. 468 ( 3 ) page: 334 - 338   2010.1

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    DOI: 10.1016/j.neulet.2009.11.027

    Web of Science

  451. FTIR Study of Methylene Blue Plasma Degradation Products through Plasma Treatment on Water Reviewed

    Shirafuji T, Hieda J, Takai O, Saito N, Morita T, Sakai O, Tachibana K.

    Tencon 2010: 2010 Ieee Region 10 Conference     page: 1938-1942   2010

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    DOI: 10.1109/tencon.2010.5686449

  452. Fabrication and Application of Super-Hydrophobic Surface Reviewed

    Takai O, Ishizaki T, Saito N.

    Journal of Japanese Society of Tribologists   Vol. 55 ( 4 ) page: 254-259   2010

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  453. Analysis of Organic Pollutant Degradation in Pulsed Plasma by Coherent Anti-Stokes Raman Spectroscopy

    M.A. Bratescu, J. Hieda, T. Umemura, N. Saito, O. Takai

    Journal of Vacuum Science and Technology A   Vol. 29   page: (3)   2010

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  454. Solution Plasma Process for Template Removal in Mesoporous Silica Synthesis

    P. Pootawang, N. Saito, O. Takai

    Japanese Journal of Applied Physics   Vol. 49   page: 126202   2010

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  455. Attenuated total reflectance spectroscopy of coumarin organosilane molecules adsorbed on a fused silica surface

    M.A. Bratescu, N. Saito, O. Takai

    Appl. Surf. Sci.   Vol. 257   page: 1792-1799   2010

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    Language:English   Publishing type:Research paper (scientific journal)  

  456. Corrosion resistance and chemical stability of super-hydrophobic film deposited on magnesium alloy AZ31 by microwave plasma-enhanced chemical vapor deposition

    T. Ishizaki, J. Hieda, N. Saito, N. Saito, O. Takai

    Electrochim. Acta   Vol. 55   page: 7094-7101   2010

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  457. Oxygen Gas Barrier Properties of Hydrogenated Amorphous Carbon Thin Films Deposited with a Pulse-Biased Inductively Coupled Plasma Chemical Vapor Deposition Method

    S. Baek, T. Shirafiji, S. Cho, N. Saito, O. Takai

    Japanese Journal of Applied Physics   Vol. 49   page: 08JF10-1-08JF10-6   2010

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  458. Effect of increasing hardness on Si-containing diamond-like carbon film during tribo -test

    S. G. Kim, S. W. Kim, N. Saito, O. Takai

    Diamond&Related Materials   Vol. 19   page: 1017-1020   2010

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  459. Time-resolved Optical Emission Spectroscopy in Water Electrical Discharges

    C. Miron, MA. Bratescu, N. Saito, O. Takai

    Plasma Chemistry and Plasma Processing   Vol. 30   page: 619-631   2010

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  460. Correlation of Cell Adhesive Behaviors on Super-hydrophobic, Super-hydrophilic, and Micropatterned Super-hydrophobic/Super-hydrophilic surfaces to their surface chemistry

    T. Ishizaki, N. Saito, O. Takai

    Langmuir   Vol. 26   page: 8147-8154   2010

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  461. 超はっ水表面の作製法とその応用 (特集 固液界面の物理)

    高井 治, 石崎 貴裕, 齋藤 永宏

    トライボロジスト   Vol. 55   page: 254-259   2010

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  462. Solution Plasma Process for Template Removal in Mesoporous Silica Synthesis

    Pootawang Panuphong, Saito Nagahiro, Takai Osamu

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 49 ( 12 )   2010

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    DOI: 10.1143/JJAP.49.126202

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  463. Solution Plasma Process for Template Removal in Mesoporous Silica Synthesis

    Pootawang Panuphong, Saito Nagahiro, Takai Osamu

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 49 ( 12 )   2010

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    DOI: 10.1143/JJAP.49.126202

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  464. A Novel 3-dimensional Cell Culture System for Embryoid bodies' Formation

    Zou Xiang-Hui, Wu Yun-Ying, Zhuang Dong-Hong, Zha Guang-Cai, Saito Nagahiro, Takai Osamu

    2010 3RD INTERNATIONAL CONFERENCE ON BIOMEDICAL ENGINEERING AND INFORMATICS (BMEI 2010), VOLS 1-7     page: 1627 - 1632   2010

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  465. Solution Plasma Surface Modification for Nanocarbon-Composite Materials

    HIEDA Junko, SHIRAFUJI Tatsuru, NOGUCHI Yohei, SAITO Nagahiro, TAKAI Osamu

    Journal of the Japan Institute of Metals and Materials   Vol. 73 ( 12 ) page: 938 - 942   2009.12

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    &nbsp;&nbsp;Surface modification of carbon nanoballs (CNBs) using a plasma in liquid phase (solution plasma) and preparation of CNB/polyamide 6 (PA6) nanocomposite were demonstrated. Reactive species such as OH radical and H<sub>2</sub>O<sub>2</sub> generated from solution plasma oxidized the surface of CNBs and changed into hydrophilic. Mechanical properties (modulus of elasticity in tension and flexural modulus, especially impact strength) of hydrophilic CNB/PA6 composite were improved as compared to PA6 and untreated CNB/PA6 composite. CNBs with hydrophilic surface modified by solution plasma were well-dispersed into PA6 matrix.<br>

    DOI: 10.2320/jinstmet.73.938

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  466. Fibrinogen Immobilization Behavior on a Planar Polyelectrolyte Brush

    FUJIMA Takuya, MATSUNO Masayuki, SAITO Nagahiro, TAKAI Osamu

    Journal of The Surface Finishing Society of Japan   Vol. 60 ( 12 ) page: 795 - 799   2009.12

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    We investigated human plasma fibrinogen (HPF) immobilization onto a planar sodium polystyrene sulfonate (NaPSS) brush in a protein aqueous solution. The saturated amount and time constant of the phenomenon were measured using time-resolved attenuated total reflection (ATR) UV absorption technique. The static and kinetic behavior were revealed to depend on the salt concentration in the protein solution. The results indicate that the immobilization is driven by the entropic effect and coulombic interaction, in contrast to previous reports for micellar PEB that the entropic effect is dominant. The immobilization mechanism identified in this work is independent of the molecular species and is applicable for any combination of protein and planar PEB with the same sign of charge in water, which is consistent with the nonspecific immobilization of proteins onto various PEB that has been reported to date.

    DOI: 10.4139/sfj.60.795

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  467. Needle electrode erosion in water plasma discharge

    Potocky S., Saito N., Takai O.

    THIN SOLID FILMS   Vol. 518 ( 3 ) page: 918 - 923   2009.12

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    DOI: 10.1016/j.tsf.2009.07.172

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  468. Synthesis process of gold nanoparticles in solution plasma

    Saito Nagahiro, Hieda Junko, Takai Osamu

    THIN SOLID FILMS   Vol. 518 ( 3 ) page: 912 - 917   2009.12

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    DOI: 10.1016/j.tsf.2009.07.156

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  469. Needle electrode erosion in water plasma discharge

    Potocky S., Saito N., Takai O.

    THIN SOLID FILMS   Vol. 518 ( 3 ) page: 918 - 923   2009.12

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    DOI: 10.1016/j.tsf.2009.07.172

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  470. Synthesis process of gold nanoparticles in solution plasma

    Saito Nagahiro, Hieda Junko, Takai Osamu

    THIN SOLID FILMS   Vol. 518 ( 3 ) page: 912 - 917   2009.12

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    DOI: 10.1016/j.tsf.2009.07.156

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  471. Phospholipase C zeta mRNA Expression and its Potency During Spermatogenesis for Activation of Quail Oocyte as a Sperm Factor

    Mizushima Shusei, Takagi Soichi, Ono Tamao, Atsumi Yusuke, Tsukada Akira, Saito Noboru, Shimada Kiyoshi

    MOLECULAR REPRODUCTION AND DEVELOPMENT   Vol. 76 ( 12 ) page: 1200 - 1207   2009.12

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    DOI: 10.1002/mrd.21097

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  472. Solution Plasma Surface Modification for Nanocarbon-Composite Materials

    Hieda Junko, Shirafuji Tatsuru, Noguchi Yohei, Saito Nagahiro, Takai Osamu

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   Vol. 73 ( 12 ) page: 938 - 942   2009.12

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  473. Phospholipase C zeta mRNA Expression and its Potency During Spermatogenesis for Activation of Quail Oocyte as a Sperm Factor

    Mizushima Shusei, Takagi Soichi, Ono Tamao, Atsumi Yusuke, Tsukada Akira, Saito Noboru, Shimada Kiyoshi

    MOLECULAR REPRODUCTION AND DEVELOPMENT   Vol. 76 ( 12 ) page: 1200 - 1207   2009.12

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    DOI: 10.1002/mrd.21097

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  474. Solution Plasma Surface Modification for Nanocarbon-Composite Materials

    Hieda Junko, Shirafuji Tatsuru, Noguchi Yohei, Saito Nagahiro, Takai Osamu

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   Vol. 73 ( 12 ) page: 938 - 942   2009.12

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  475. Chemical State of Silver in the Antibacterial Glaze of Sanitary Ware

    KATO Yoshihiro, YAMAZAKI Satoru, ISU Norifumi, NUMAKO Chiya, SAITO Nagahiro, TAKAI Osamu

      Vol. 37 ( 10 ) page: 739 - 744   2009.10

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  476. Super-hydrophobic and super-hydrophilic surfaces by biomimetics Reviewed

    Fine chemicals   Vol. 38 ( 9 ) page: 48-56   2009.9

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  477. Fabrication of microtemplates for the control of bacterial immobilization

    Miyahara Y, Mitamura K, Saito N, Takai O.

    Journal of Vacuum Science & Technology A   Vol. 27 ( 5 ) page: 1183 - 1187   2009.9

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    DOI: 10.1116/1.3179158

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  478. Fabrication of microtemplates for the control of bacterial immobilization

    Y. Miyahara, K. Mitamura, N. Saito, O. Takai

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A   Vol. 27 ( 5 ) page: 1183-1187   2009.9

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  479. Characterization of platinum catalyst supported on carbon nanoballs prepared by solution plasma processing

    Ichin Yoshimichi, Mitamura Koji, Saito Nagahiro, Takai Osamu

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A   Vol. 27 ( 4 ) page: 826 - 830   2009.7

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    DOI: 10.1116/1.3077285

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  480. Identification of Two Types of Growth Hormone Receptor Mutations in Two Strains of Sex-linked Dwarf Chickens

    Tahara Kenichi, Tsukada Akira, Hanai Takanobu, Okumura Kenta, Yamada Kikumi, Murai Atsushi, Yamamoto Rikiya, Maeno Makoto, Saito Noboru, Shimada Kiyoshi

    JOURNAL OF POULTRY SCIENCE   Vol. 46 ( 3 ) page: 249 - 256   2009.7

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    DOI: 10.2141/jpsa.46.249

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  481. Characterization of platinum catalyst supported on carbon nanoballs prepared by solution plasma processing

    Ichin Yoshimichi, Mitamura Koji, Saito Nagahiro, Takai Osamu

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A   Vol. 27 ( 4 ) page: 826 - 830   2009.7

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    DOI: 10.1116/1.3077285

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  482. Identification of Two Types of Growth Hormone Receptor Mutations in Two Strains of Sex-linked Dwarf Chickens

    Tahara Kenichi, Tsukada Akira, Hanai Takanobu, Okumura Kenta, Yamada Kikumi, Murai Atsushi, Yamamoto Rikiya, Maeno Makoto, Saito Noboru, Shimada Kiyoshi

    JOURNAL OF POULTRY SCIENCE   Vol. 46 ( 3 ) page: 249 - 256   2009.7

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    DOI: 10.2141/jpsa.46.249

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  483. Self-assembly of human plasma fibrinogens on binary organosilane monolayers with micro domains

    Lee S. H., Saito N., Takai O.

    APPLIED SURFACE SCIENCE   Vol. 255 ( 18 ) page: 7912 - 7917   2009.6

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    DOI: 10.1016/j.apsusc.2009.04.201

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  484. Self-assembly of human plasma fibrinogens on binary organosilane monolayers with micro domains

    Lee S. H., Saito N., Takai O.

    APPLIED SURFACE SCIENCE   Vol. 255 ( 18 ) page: 7912 - 7917   2009.6

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.apsusc.2009.04.201

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  485. Self-assembly of human plasma fibrinogens on binary organosilane monolayers with micro domains

    S. H. Lee, N. Saito, O. Takai

    APPLIED SURFACE SCIENCE   Vol. 255 ( 18 ) page: 7912-7917   2009.6

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  486. Highly reproducible technique for three-dimensional nanostructure fabrication via anodization scanning probe lithography

    Lee SunHyung, Saito Nahiro, Takai Osamu

    APPLIED SURFACE SCIENCE   Vol. 255 ( 16 ) page: 7302 - 7306   2009.5

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    DOI: 10.1016/j.apsusc.2009.03.087

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  487. Highly reproducible technique for three-dimensional nanostructure fabrication via anodization scanning probe lithography

    Lee SunHyung, Saito Nahiro, Takai Osamu

    APPLIED SURFACE SCIENCE   Vol. 255 ( 16 ) page: 7302 - 7306   2009.5

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    DOI: 10.1016/j.apsusc.2009.03.087

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  488. Highly reproducible technique for three-dimensional nanostructure fabrication via anodization scanning probe lithography

    S. H. Lee, N. Saito, O. Takai

    APPLIED SURFACE SCIENCE   Vol. 255 ( 16 ) page: 7302-7306   2009.5

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  489. Development of Biomimetic Materials Processing

    TAKAI Osamu, SAITO Nagahiro, ISHIZAKI Takahiro

    Materia Japan   Vol. 48 ( 4 ) page: 174 - 178   2009.4

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    DOI: 10.2320/materia.48.174

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  490. Chemical dynamics of protein adsorption and desorption on regulated surfaces in aqueous solutions

    Saito Nagahiro, Hieda Junko, Takai Osamu

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   Vol. 237   2009.3

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  491. Chemical dynamics of protein adsorption and desorption on regulated surfaces in aqueous solutions

    Saito Nagahiro, Hieda Junko, Takai Osamu

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   Vol. 237   2009.3

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  492. Effects of Humidity on the Friction Coefficient of Diamond-Like Carbon (DLC) Coating

    S. G. Kim, Y. K. Cho, W. S. Jang, S. W. Kim, N. Saito, O. Takai

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   Vol. 54 ( 3 ) page: 1228-1236   2009.3

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  493. Adsorption of protein on polyelectrolyte brush surface Reviewed

    Higuchi A, Tatematsu H, Fujima T, Saito N, Takai O.

    Abstracts of Papers of the American Chemical Society   Vol. 237   page: .   2009

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  494. Chemical dynamics of protein adsorption and desorption on regulated surfaces in aqueous solutions Reviewed

    Saito N, Hieda J, Takai O.

    Abstracts of Papers of the American Chemical Society   Vol. 237   page: .   2009

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  495. Bioreorganization surface with hierarchical structure Reviewed

    Takai O, Saito N, Sato H, Miura Y, Kobayashi K.

    Abstracts of Papers of the American Chemical Society   Vol. 237   page: .   2009

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  496. Surfactant-Assisted Fabrication of Tin Oxide Nanowires Through One-Step Electrochemically Induced Chemical Deposition

    T. Ishizaki, N. Saito, O. Takai

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   Vol. 156 ( 10 ) page: D413-D417   2009

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  497. Characterization of Platinum Catalyst Supported on Carbon Nanoballs Prepared by Solution Plasma Processing Reviewed

    Y. Ichino, K. Mitamura, N. Saito, O. Takai

    J. Vac. Sci. Technol. A   Vol. 27 ( 4 ) page: 826-830   2009

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  498. Surface Modification of Gold Nanorods by Organosilanes Reviewed

    K. Mitamura, T. Imae, N. Saito, O. Takai

    Composite Interfaces   Vol. 16 ( 4-6 ) page: 377-385   2009

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  499. Biomimetic materials processing

    T. Ishizaki, Y. Ichino, K. Mitamura, N. Saito, O. Takai

    Proceedings of SPIE   Vol. 7404   page: 1-12   2009

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  500. Solution plasma surface modification for nanocarbon-composite materials

    J. Hieda, T. Shirafuji, Y. Noguchi, N. Saito, O. Takai

    J. Jpn. Inst. Metals   Vol. 73   page: 938-942   2009

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  501. Synthesis process of gold nanoparticles in solution plasma

    N. Saito, J. Hieda, O. Takai,

    Thin Solid Films   Vol. 518   page: 912-917   2009

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  502. Needle electrode erosion in water plasma discharge

    S. Potocky, N. Saito, O. Takai

    Thin Solid Films   Vol. 518   page: 918-923   2009

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  503. Study of Protein Adsorption onto a Polymer Film by in-situ UV Attenuated Total Reflectance Spectroscopy

    M.A. Bratescu, N. Saito, O. Takai

    Mater. Res. Soc. Symp. Proc.   Vol. 1138   page: FF03-15   2009

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  504. Material Processing Using Underwater Discharge Plasma

    TAKAI Osamu, SAITO Nagahiro, SANO Noriaki, IMASAKA Kiminobu, SUEHIRO Junya

    Journal of plasma and fusion research   Vol. 84 ( 10 ) page: 674 - 678   2008.10

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  505. CS-4-5 Fabrication of Biomimetic Surface and Interface

    Saito Nagahiro

    Proceedings of the Society Conference of IEICE   Vol. 2008 ( 2 ) page: "S-16"-"S-17"   2008.9

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  506. Self-Assembled Structure and Function

    SAITO Nagahiro, ISHIZAKI Takahiro, TAKAI Osamu

    Journal of the Adhesion Society of Japan   Vol. 44 ( 9 ) page: 363 - 370   2008.9

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  507. Influence of Ar gas flow rate in organosilicon plasma for the fabrication of SiO:CH thin films by PECVD method

    Yun Yongsup, Yoshida Takanori, Shimazu Norifumi, Nanba Naoki, Inoue Yasushi, Saito Nagahiro, Takai Osamu

    SURFACE & COATINGS TECHNOLOGY   Vol. 202 ( 22-23 ) page: 5259 - 5261   2008.8

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    DOI: 10.1016/j.surfcoat.2008.06.004

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  508. Size-regulated gold nanoparticles fabricated by a discharge in reverse micelle solutions

    Hieda Junko, Saito Nagahiro, Takai Osamu

    SURFACE & COATINGS TECHNOLOGY   Vol. 202 ( 22-23 ) page: 5343 - 5346   2008.8

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    DOI: 10.1016/j.surfcoat.2008.06.092

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  509. Influence of Ar gas flow rate in organosilicon plasma for the fabrication of SiO:CH thin films by PECVD method

    Yun Yongsup, Yoshida Takanori, Shimazu Norifumi, Nanba Naoki, Inoue Yasushi, Saito Nagahiro, Takai Osamu

    SURFACE & COATINGS TECHNOLOGY   Vol. 202 ( 22-23 ) page: 5259 - 5261   2008.8

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    DOI: 10.1016/j.surfcoat.2008.06.004

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  510. Size-regulated gold nanoparticles fabricated by a discharge in reverse micelle solutions

    Hieda Junko, Saito Nagahiro, Takai Osamu

    SURFACE & COATINGS TECHNOLOGY   Vol. 202 ( 22-23 ) page: 5343 - 5346   2008.8

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    DOI: 10.1016/j.surfcoat.2008.06.092

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  511. 平成20年度全国鉱山・製錬所現場担当者会議

    児玉 淳一, 深堀 大介, 柴田 悦郎, 小山 和也, 齋藤 永宏, 葛谷 俊博

    Journal of MMIJ : journal of the Mining and Materials Processing Institute of Japan   Vol. 124 ( 8 ) page: 543 - 545   2008.8

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  512. Morphology of high-frequency electrohydraulic discharge for liquid-solution plasmas

    Takeda Tadashi, Chang Jen-Shih, Ishizaki T., Saito N., Takai Osamu

    IEEE TRANSACTIONS ON PLASMA SCIENCE   Vol. 36 ( 4 ) page: 1158 - 1159   2008.8

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    DOI: 10.1109/TPS.2008.925713

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  513. Morphology of high-frequency electrohydraulic discharge for liquid-solution plasmas

    Takeda Tadashi, Chang Jen-Shih, Ishizaki T., Saito N., Takai Osamu

    IEEE TRANSACTIONS ON PLASMA SCIENCE   Vol. 36 ( 4 ) page: 1158 - 1159   2008.8

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    DOI: 10.1109/TPS.2008.925713

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  514. Expression of P450arom, AMH and ER alpha mRNA in gonads of turkey, duck and goose within one week of age

    Koba Naomi, Ohfuji Toshimichi, Ha Yonju, Mizushima Shusei, Tsukada Akira, Saito Noboru, Shimada Kiyoshi

    JOURNAL OF POULTRY SCIENCE   Vol. 45 ( 3 ) page: 220 - 226   2008.7

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    DOI: 10.2141/jpsa.45.220

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  515. Expression of P450arom, AMH and ER alpha mRNA in gonads of turkey, duck and goose within one week of age

    Koba Naomi, Ohfuji Toshimichi, Ha Yonju, Mizushima Shusei, Tsukada Akira, Saito Noboru, Shimada Kiyoshi

    JOURNAL OF POULTRY SCIENCE   Vol. 45 ( 3 ) page: 220 - 226   2008.7

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    DOI: 10.2141/jpsa.45.220

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  516. Profiles of mRNA expression of FOXL2, p450arom, DMRT 1, AMH, P450(c17), SF1, ER alpha and AR, in relation to gonadal sex differentiation in duck embryo

    Koba Naomi, Ohfuji Toshimichi, Ha Yonju, Mizushima Shusei, Tsukada Akira, Saito Noboru, Shimada Kiyoshi

    JOURNAL OF POULTRY SCIENCE   Vol. 45 ( 2 ) page: 132 - 138   2008.4

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    DOI: 10.2141/jpsa.45.132

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  517. Profiles of mRNA expression of FOXL2, p450arom, DMRT 1, AMH, P450(c17), SF1, ER alpha and AR, in relation to gonadal sex differentiation in duck embryo

    Koba Naomi, Ohfuji Toshimichi, Ha Yonju, Mizushima Shusei, Tsukada Akira, Saito Noboru, Shimada Kiyoshi

    JOURNAL OF POULTRY SCIENCE   Vol. 45 ( 2 ) page: 132 - 138   2008.4

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    DOI: 10.2141/jpsa.45.132

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  518. Attenuated total reflectance spectroscopy of simultaneous processes: Corrosion inhibition of cuprous oxide by benzotriazole

    Bratescu Maria Antoaneta, Allred Daniel B., Saito Nagahiro, Sarikaya Mehmet, Takai Osamu

    APPLIED SURFACE SCIENCE   Vol. 254 ( 10 ) page: 2960 - 2966   2008.3

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    DOI: 10.1016/j.apsusc.2007.10.048

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  519. Attenuated total reflectance spectroscopy of simultaneous processes: Corrosion inhibition of cuprous oxide by benzotriazole

    Bratescu Maria Antoaneta, Allred Daniel B., Saito Nagahiro, Sarikaya Mehmet, Takai Osamu

    APPLIED SURFACE SCIENCE   Vol. 254 ( 10 ) page: 2960 - 2966   2008.3

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    DOI: 10.1016/j.apsusc.2007.10.048

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  520. バイオチップ開発のためのプラズマアクティベーション (特集 プラズマが拓く新技術)

    齋藤 永宏, 石崎 貴裕, 高井 治

    ケミカルエンジニヤリング   Vol. 53 ( 3 ) page: 213-218   2008.3

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  521. Comparative study of the molecular aggregation state of alkyl organic monolayers prepared on Si and hydrogen-terminated Si substrates

    Ishizaki Takahiro, Saito Nagahiro, Lee SunHyung, Takai Osamu

    NANOTECHNOLOGY   Vol. 19 ( 5 )   2008.2

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    DOI: 10.1088/0957-4484/19/05/055601

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  522. Comparative study of the molecular aggregation state of alkyl organic monolayers prepared on Si and hydrogen-terminated Si substrates

    Ishizaki Takahiro, Saito Nagahiro, Lee SunHyung, Takai Osamu

    NANOTECHNOLOGY   Vol. 19 ( 5 )   2008.2

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    DOI: 10.1088/0957-4484/19/05/055601

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  523. Fabrication and structure of alginate gel incorporating gold nanorods

    Mitamura Koji, Imae Toyoko, Saito Nagahiro, Takai Osamu

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 112 ( 2 ) page: 416 - 422   2008.1

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    DOI: 10.1021/jp076755a

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  524. Fabrication and structure of alginate gel incorporating gold nanorods

    Mitamura Koji, Imae Toyoko, Saito Nagahiro, Takai Osamu

    JOURNAL OF PHYSICAL CHEMISTRY C   Vol. 112 ( 2 ) page: 416 - 422   2008.1

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    DOI: 10.1021/jp076755a

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  525. 表面はどこまでわかったか(ヘッドライン:悪魔が創った表面)

    齋藤 永宏, 高井 治

    化学と教育   Vol. 56 ( 9 ) page: 422 - 425   2008

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:公益社団法人 日本化学会  

    本稿では,最新の顕微鏡技術を用い表面構造を観察した例を示すとともに,その表面構造が材料特性や機能とどのように関わっているのか紹介する。自然界の蓮や里芋の葉の表面構造は,nmスケールでのフラクタル構造となっており,これが「超はっ水性」という機能を発現させる大きな要因となっている。また,表面には凹凸構造とはことなり,元来人の目では認知しがたい構造も存在する。ここでは,人の目で認知しがたい構造の例として,材料表面の表面電位構造を可視化した例を示す。最後に,原子間力顕微鏡を用い,バイオマテリアル開発に不可欠な情報である材料表面上でタンパク質がつくる集合体構造の観察例を示す。

    DOI: 10.20665/kakyoshi.56.9_422

    CiNii Article

  526. Effects of Humidity and Solution Age on Growth of Organosilane Self-Assembled Monolayers Reviewed

    Lee S, Ishizaki T, Saito N, Takai O.

    Japanese Journal of Applied Physics   Vol. 47 ( 8 ) page: 6416-6421   2008

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    DOI: 10.1143/jjap.47.6416

  527. Effect of Reaction Temperature on Growth of Organosilane Self-Assembled Monolayers Reviewed

    Lee S, Ishizaki T, Saito N, Takai O.

    Japanese Journal of Applied Physics   Vol. 47 ( 8 ) page: 6442-6447   2008

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    DOI: 10.1143/jjap.47.6442

  528. Exotic shapes of gold nanoparticles synthesized using plasma in aqueous solution

    Hieda Junko, Saito Nagahiro, Takai Osamu

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A   Vol. 26 ( 4 ) page: 854 - 856   2008

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    DOI: 10.1116/1.2919139

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  529. Counterion Immobilization in a Strong Polyelectrolyte Brush by Zeta Potential Measurements Reviewed

    Fujima Takuya, Okano Takashi, Saito Nagahiro, Takai Osamu

    TRANSACTIONS OF THE MATERIALS RESEARCH SOCIETY OF JAPAN, VOL 33, NO 2   Vol. 33 ( 2 ) page: 323-326   2008

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  530. Control of site-selective adsorption reaction on a biomimetic super-hydrophilic /super-hydrophobic micropatterned template

    T. Ishizaki, H. Sakurai, N. Saito, O. Takai

    Surf. Coat. Technol.   Vol. 202   page: 5535-5538   2008

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  531. Attenuated total reflectance spectroscopy of simultaneous processes: corrosion inhibition of cuprous oxide by benzotriazole

    B. A. Bratescu, D. B. Allred, N. Saito, M. Sarikaya, O. Takai

    Appl. Surf. Sci   Vol. 254   page: 2960-2966   2008

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  532. *Fabrication and structure of alginate gel incorporating gold nanorods

    K. Mitamura, T. Imae, N. Saito, O. Takai

    J. Phys. Chem. C.   Vol. 112   page: 416-422   2008

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  533. Comparative study of the molecular aggregation state of alkyl organic monolayers prepared on Si and hydrogen-terminated Si substrates

    T. Ishizaki, N. Saito, S. Lee, O.Takai

    Nanotehnology   Vol. 19   page: 0555601-055607   2008

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  534. Special type of plasma dielectric barrier discharge reactor for direct ozonization of water and degradation of organic pollution

    P. Baroch, N. Saito, O. Takai

    J. Phys. D - Appl. Phys.   Vol. 41   page: ar085207   2008

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  535. Effect of Reaction Temperature on Growth of Organosilane Self-Assembled Monolayer

    S. Lee, T. Ishizaki, N. Saito, O. Takai

    J. Jpn. Appl. Phys.   Vol. 47   page: 6442-6447   2008

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  536. Surface Characterization on Binary Nano/Micro Domain Composed of Alkyl and Amino-terminated Self-assembled Monolayer

    S. H. Lee, N. Saito, O. Takai

    Appl. Surf. Sci.   Vol. 254   page: 7453-7458   2008

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  537. Effect of Humidity and Solution Age on the Growth of Organosilane Self-Assembled Monolayers

    S. Lee, T. Ishizaki, N. Saito, O. Takai

    J. Jpn. Appl. Phys.   Vol. 47   page: 6416-6421   2008

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  538. Size-regulated Gold Nanoparticles Fabricated by a Discharge in Reverse Micelle Solutions

    J. Hieda, N. Saito, O. Takai

    Surf. Coat. Technol.   Vol. 202   page: 5343-5346   2008

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  539. Influence of Ar gas flow rate in organosilicon plasma for the fabrication of SiO:CH thin films by PECVD method

    Y. Yun, T. Yoshida, N. Shimazu, N. Nanba, Y. Inoue, N. Saito, O. Takai

    Surf. Coat. Technol.   Vol. 202   page: 5259-5261   2008

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  540. Reaction Dynamics for Gold Nanoparticles Synthesis in Solution Plasma

    J. Hieda, N. Saito, O. Takai

    Mater. Res. Soc. Symp.   Vol. Proc.   page: 1056-HH03-39   2008

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  541. Morphology of high-frequency electrohydraulic discharge for liquid-solution plasmas,

    T. Takeda, J. S. Chang, T. Ishizaki, N. Saito, O. Takai

    IEEE Transaction on Plasma Science   Vol. 36   page: 1158-1159   2008

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  542. 水中プラズマによる材料(無機)プロセス(<小特集>水中プラズマが拓く新しい無機・有機・バイオプロセス)

    高井治, 齋藤永宏, 佐野紀彰, 今坂公宣, 末廣純也

    プラズマ・核融合学会誌   Vol. 84(10)   page: 674-678   2008

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  543. Exotic shapes of gold nanoparticles synthesized using plasma in aqueous solution

    J. Hieda, N. Saito, O. Takai

    J. Vac. Sci. Tecnol. A   Vol. A 26   page: 854-856   2008

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  544. Bipolar pulsed electrical discharge for decomposition of organic compounds in water

    P. Baroch, V. Anita, N. Saito, O. Takai

    J. Electrostatics   Vol. 66   page: 294-299   2008

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  545. Scanning probe microscopy for the analysis of composite Ti/hydrocarbon plasma polymer thin films

    Choukourov, A. Grinevich, D. Slavinska, H. Biederman, N. Saito, O. Takai,

    Surf. Sci.   Vol. 602   page: 1011-1019   2008

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  546. バイオミメティクスによる表面界面の創製(CS-4.有機・バイオデバイスに向けた界面の役割,シンポジウムセッション)

    齋藤永宏

    電子情報通信学会ソサイエティ大会講演論文集 エレクトロニクス     page: S-16"-"S-17"   2008

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  547. Size-regulated Gold Nanoparticles Fabricated by a Discharge in Reverse Micelle Solutions

    J. Hieda, N. Saito, O. Takai

    Surf. Coat. Tecnol.   Vol. 202   page: 5343-5346   2008

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  548. Bipolar Pulsed Electrical Discharges in Liquid

    P. Baroch, N. Saito

    IEEE Transaction on Plasma Science   Vol. 36   page: 1156-1157   2008

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  549. Control of site-selective adsorption reaction on a biomimetic super-hydrophilic /super-hydrophobic micropatterned template

    T. Ishizaki, H. Sakurai, N. Saito, O. Takai

    Surf. Coat. Technol.   Vol. 202   page: 5535-5538   2008

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  550. Counterion Immobilization in a Strong Polyelectrolyte Brush by Zeta Potential Measurements

    Fujima Takuya, Okano Takashi, Saito Nagahiro, Takai Osamu

    Transactions of the Materials Research Society of Japan   Vol. 33 ( 2 ) page: 323 - 326   2008

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    The counterion immobilization has been investigated about a brush configuration of a strong polyelectrolyte, sodium polystyrene sulfonate (NaPSS). Zeta potential of the planar NaPSS brushes was measured under a variety of salt, sodium chloride (NaCl), concentration conditions. Analysis based on Poisson-Boltzmann equation provided the amount of counterion that was unimmobilized and hydrodynamically mobile outside the brush layer. Its salt concentration dependence revealed the counterion immobilization to be weakened by the salt addition with following a power law between the unimmobilized counterion rate and the added salt concentration.

    DOI: 10.14723/tmrsj.33.323

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  551. Identification of differentially expressed genes involved in the regression and development of the chicken Mullerian duct

    Ha Yonju, Tsukada Akira, Saito Noboru, Zadworny David, Shimada Kiyoshi

    INTERNATIONAL JOURNAL OF DEVELOPMENTAL BIOLOGY   Vol. 52 ( 8 ) page: 1135 - 1141   2008

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    DOI: 10.1387/ijdb.072441yh

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  552. Immunocytochemical distribution of AQP9 in chicken brain

    Yoshimura Keiji, Aste Nicoletta, Saito Noboru

    NEUROSCIENCE RESEARCH   Vol. 61   page: S223 - S223   2008

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  553. Variation in dislocation pattern observed in SCS films fractured by tensile test: Effects of film thickness and testing temperature

    Nakao Shigeki, Ando Taeko, Arai Shigeo, Saito Noriyuki, Sato Kazuo

    MICROELECTROMECHANICAL SYSTEMS - MATERIALS AND DEVICES   Vol. 1052   page: 123 - +   2008

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  554. Counterion Immobilization in a Strong Polyelectrolyte Brush by Zeta Potential Measurements

    Fujima Takuya, Okano Takashi, Saito Nagahiro, Takai Osamu

    Transactions of the Materials Research Society of Japan   Vol. 33 ( 2 ) page: 323 - 326   2008

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    Publishing type:Research paper (scientific journal)   Publisher:The Materials Research Society of Japan  

    The counterion immobilization has been investigated about a brush configuration of a strong polyelectrolyte, sodium polystyrene sulfonate (NaPSS). Zeta potential of the planar NaPSS brushes was measured under a variety of salt, sodium chloride (NaCl), concentration conditions. Analysis based on Poisson-Boltzmann equation provided the amount of counterion that was unimmobilized and hydrodynamically mobile outside the brush layer. Its salt concentration dependence revealed the counterion immobilization to be weakened by the salt addition with following a power law between the unimmobilized counterion rate and the added salt concentration.

    DOI: 10.14723/tmrsj.33.323

    CiNii Article

  555. Immunocytochemical distribution of AQP9 in chicken brain

    Yoshimura Keiji, Aste Nicoletta, Saito Noboru

    NEUROSCIENCE RESEARCH   Vol. 61   page: S223 - S223   2008

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    Web of Science

  556. Variation in dislocation pattern observed in SCS films fractured by tensile test: Effects of film thickness and testing temperature

    Nakao Shigeki, Ando Taeko, Arai Shigeo, Saito Noriyuki, Sato Kazuo

    MICROELECTROMECHANICAL SYSTEMS - MATERIALS AND DEVICES   Vol. 1052   page: 123 - +   2008

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  557. Solution Plasma Materials Processing

    SAITO Nagahiro, HIEDA Junko, MIRON Camelia, TAKAI Osamu

    Journal of The Surface Finishing Society of Japan   Vol. 58 ( 12 ) page: 810 - 814   2007.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Surface Finishing Society of Japan  

    DOI: 10.4139/sfj.58.810

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  558. Application of Ultra-Water-Repellent Surface to Cell Culture

    Isobe Kimiyasu, Nagasawa Shouko, WU Yunying, SAITO Nagahiro, HIBINO Eri, TAKAI Osamu, HONDA Hiroyuki

    Journal of bioscience and bioengineering   Vol. 104 ( 5 ) page: 420 - 423   2007.11

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    Publishing type:Research paper (scientific journal)   Publisher:公益社団法人日本生物工学会  

    An oxidase catalyzing conversion of N^α-benzyloxycarbonyl-L-lysine (N^α-Z-L-lysine) to N^α-benzyloxycarbonyl-L-aminoadipate-δ-semialdehyde (N^α-Z-L-AASA) was purified from Rhodococcus sp. AIU Z-35-1, and its properties were revealed. This enzyme catalyzed an oxidative deamination of the ε-amino group of N^α-acyl-L-lysine and the a-amino group of N^ε-acyl-L-lysine. The apparent K_m value for N^α-acetyl-L-lysine was much larger than that for N^ε-acetyl-L-lysine. The peptidyl L-lysines, L-lysine and many other L-amino acids were also oxidized, but N^α-acyl-D-lysine, N^ε-acyl-D-lysine and D-amino acids were not. Thus, the conversion of N^α-Z-L-lysine into N^α-Z-L-AASA was catalyzed by the L-amino acid oxidase with broad substrate specificity. This enzyme, a flavoprotein with a molecular mass of 100 kDa, consisted of two identical subunits of 51 kDa.

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  559. Application of Ultra-Water-Repellent Surface to Cell Culture