2021/11/11 更新

写真a

トク ユウキ
徳 悠葵
TOKU Yuhki
所属
大学院工学研究科 マイクロ・ナノ機械理工学専攻 マイクロ・ナノ機械科学 講師
大学院担当
大学院工学研究科
学部担当
工学部 機械・航空宇宙工学科
職名
講師
連絡先
メールアドレス
外部リンク

学位 1

  1. 博士(工学) ( 2014年3月   秋田大学 ) 

研究キーワード 1

  1. ナノ材料

研究分野 3

  1. ものづくり技術(機械・電気電子・化学工学) / 材料力学、機械材料

  2. ものづくり技術(機械・電気電子・化学工学) / 加工学、生産工学

  3. ものづくり技術(機械・電気電子・化学工学) / 材料力学、機械材料

経歴 9

  1. 名古屋大学   大学院工学研究科 マイクロ・ナノ機械理工学専攻 マイクロ・ナノ機械科学   講師

    2018年10月 - 現在

  2. 名古屋大学   大学院工学研究科 マイクロ・ナノ機械理工学専攻 マイクロ・ナノ機械科学   助教

    2017年4月 - 2018年9月

  3. 名古屋大学   大学院工学研究科 機械理工学専攻 先端材料・創製工学   助教

    2014年10月 - 2017年3月

  4. 日本学術振興会 特別研究員PD

    2014年4月 - 2014年9月

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    国名:日本国

  5. 日本学術振興会 特別研究員PD

    2014年4月 - 2014年9月

  6. 日本学術振興会

    2014年4月 - 2014年9月

  7. 日本学術振興会 特別研究員DC2

    2013年4月 - 2014年3月

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    国名:日本国

  8. 日本学術振興会 特別研究員DC2

    2013年4月 - 2014年3月

  9. 日本学術振興会

    2013年4月 - 2014年3月

▼全件表示

学歴 1

  1. 秋田大学   工学資源学研究科   生産・建設工学専攻

    2011年4月 - 2014年3月

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    国名: 日本国

所属学協会 1

  1. 日本機械学会

委員歴 1

  1. 日本機械学会   2020年次大会実行委員会委員  

    2020年9月   

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    団体区分:学協会

受賞 3

  1. 日本機械学会東海支部特別功労賞

    2021年3月   日本機械学会東海支部  

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    受賞区分:国内学会・会議・シンポジウム等の賞 

  2. 三浦賞

    2011年3月   機械学会  

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    受賞国:日本国

  3. 独創研究学生賞(大学院修士の部)

    2010年3月   機械学会東北支部  

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    受賞国:日本国

 

論文 34

  1. Relief of strain hardening in deformed Inconel 718 by high-density pulsed electric current 査読有り

    Gu Shaojie, Cui Yi, Kimura Yasuhiro, Toku Yuhki, Ju Yang

    JOURNAL OF MATERIALS SCIENCE   56 巻 ( 29 ) 頁: 16686 - 16696   2021年10月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Materials Science  

    Abstract: The effect of high-density pulsed electric current (HDPEC) on the microstructure evolution and corresponding changes in the mechanical properties of the deformed Ni-based alloy Inconel 718 was investigated. After HDPEC treatment, the strain hardening was fully relieved and the ductility recovered correspondingly. The results show that the dislocation density plays a dominant role, and the grain size has a side effect on the strain-hardening relief. Furthermore, the correlation between the mechanical properties and microstructure evolution affected by HDPEC was clarified. HDPEC treatment provides a way to alter the microstructure and thus tailor the mechanical properties of the deformed components. Hence, it is applicable to the metal-forming field to achieve rapid relief of strain hardening and enhance formability. Graphical abstract: [Figure not available: see fulltext.]

    DOI: 10.1007/s10853-021-06344-9

    Web of Science

    Scopus

    その他リンク: https://link.springer.com/article/10.1007/s10853-021-06344-9/fulltext.html

  2. Assessment of creep behavior using a damage-coupled model for martensitic stainless steel 査読有り

    Yoon Sungmin, Kimura Yasuhiro, Toku Yuhki, Ju Yang, Park Soojeong, Kim Yunhae

    MECHANICAL ENGINEERING JOURNAL   8 巻 ( 5 )   2021年8月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:一般社団法人 日本機械学会  

    <p>In this study, the Liu–Murakami (LM) creep damage-coupled model was considered to evaluate the creep properties of martensitic stainless steel. The degree of creep damage was examined at two temperatures (565 ℃ and 593 ℃) to assess mechanically and thermally activated processes. A series of high applied stresses (applied stress/ultimate strength 0.5) was considered for accelerated creep loadings. A full set of creep constants was determined by combining the Norton and LM models. Constitutive equations were used to quantitatively estimate experimental creep curves. The variation in creep constants was discussed based on stress sensitivity, such as stress triaxiality and applied stress, depending on the power of stress. The creep strain–time curves were successfully estimated. The comparison between the experimental and analytical results was in good agreement in the tertiary regime. In addition, the compensation of the two applied temperatures provides a supplementary explanation of the relationship between the ultimate strength and rupture time in terms of temperature sensitivity. The analytical results show that different applied stresses and temperatures could be compensated to characterize the creep behavior of the material. Thus, the creep strain–time and creep strain rate–certain rupture time curves were finally achieved. The analytical process in this study provides a laboratory-scale assessment of creep properties using the accelerated creep test and LM model.</p>

    DOI: 10.1299/mej.21-00178

    Web of Science

    CiNii Article

  3. Nanotwinning and tensile behavior in cold-welded high-entropy-alloy nanowires 査読有り 国際誌

    Cui Yi, Toku Yuhki, Ju Yang

    NANOTECHNOLOGY   32 巻 ( 31 )   2021年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Nanotechnology  

    Since the fabrication technique for high-entropy alloy (HEA) nanowires/nanopillars is still in its infancy, neither experimental nor modeling analyses of their cold-welding performance have been reported. Based on insights accumulated in our previous experiments and simulations regarding cold-welded metallic nanowires, in this study, the cold-welding performance of HEA nanowires is probed by atomistic simulations. Among different materials, our simulations reveal that extensively twinned structures are formed in CoCrMnFeNi samples, but not in CoCrCuFeNi or Ni samples. The larger fracture strain in certain HEAs is due to the improved ductility around the fracturing area as well as multiple twinning. Unlike in Ni samples, the fracture strains in HEA samples, regardless of being cuboid or cylindrical, are improved by shrinking the sample size. Among different orientations, the [010]-direction monocrystalline nanowires fail at a strain over 0.6, which is almost double that of the [111] direction. The fracture strains in polycrystalline HEA samples are, on average, larger than those in polycrystalline Ni samples. Furthermore, fracture strains in randomly generated polycrystalline HEA samples are more predictable than those in polycrystalline Ni samples with identical grain configurations. As previously reported, dislocation emission is still a prerequisite to fracture in all cold-welded samples.

    DOI: 10.1088/1361-6528/abf7eb

    Web of Science

    Scopus

    PubMed

  4. Non-contact local conductivity measurement of metallic nanowires based on semi-near-field reflection of microwave atomic force microscopy 査読有り

    Tong Bo, Hirabayashi Takahiro, Toku Yuhki, Morita Yasuyuki, Ju Yang

    APPLIED PHYSICS EXPRESS   14 巻 ( 6 )   2021年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Applied Physics Express  

    In this study, a non-contact and quantitative evaluation method was developed to measure the conductivity of metallic nanowires at nanometer-scale resolution. Using a coaxial probe, microwave images and topographical images were simultaneously obtained for three nanowires via microwave atomic force microscopy (M-AFM). A semi-near-field model was established to describe the distribution of the electric field between the probe and the sample. Based on this model, the local conductivities of metallic nanowires on the nanometer scale were quantitatively evaluated in a single scan, using a metal strip substrate to calibrate the reflected signal.

    DOI: 10.35848/1882-0786/abf444

    Web of Science

    Scopus

  5. Quantitative evaluation of local permittivity of semiconductor nanomaterials using microwave atomic force microscopy 査読有り

    Zhao Minji, Tong Bo, Kimura Yasuhiro, Toku Yuhki, Morita Yasuyuki, Ju Yang

    APPLIED PHYSICS LETTERS   118 巻 ( 19 )   2021年5月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Applied Physics Letters  

    In this paper, we report a non-contact and quantitative method to evaluate the permittivity of semiconductor nanomaterials. A microwave atomic force microscopy (M-AFM) was used to obtain the topography and microwave images of nanomaterials in one scanning process. Morphology and microwave images of ZnO and CuO nanowires, and SnO2 nanobelts with high spatial resolution were obtained in the non-contact mode of M-AFM. The local relative permittivity of these one-dimensional metal oxide nanomaterials was quantitatively evaluated.

    DOI: 10.1063/5.0049619

    Web of Science

    Scopus

  6. Preferential growth of specific crystal planes based on the dimension control of single crystal SnO2 nanobelts 査読有り 国際誌

    Toku Yuhki, Togawa Yosuke, Morita Yasuyuki, Ju Yang

    MATERIALS LETTERS   285 巻   2021年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Materials Letters  

    DOI: 10.1016/j.matlet.2020.129121

    Web of Science

    Scopus

  7. The deformation mechanism in cold-welded gold nanowires due to dislocation emission 査読有り 国際誌

    Cui Yi, Toku Yuhki, Kimura Yasuhiro, Ju Yang

    COMPUTATIONAL MATERIALS SCIENCE   188 巻   2021年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Computational Materials Science  

    DOI: 10.1016/j.commatsci.2020.110214

    Web of Science

    Scopus

  8. Evaluation of Electric Current-Induced Improvement of Fracture Characteristics in SUS316 査読有り 国際誌

    Yoon Sungmin, Kimura Yasuhiro, Cui Yi, Toku Yuhki, Ju Yang

    MATERIALS TRANSACTIONS   62 巻 ( 6 ) 頁: 748 - 755   2021年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Materials Transactions  

    The application of high-density pulsed electric current (HDPEC) is one of the effective methods for the modification of material properties in metals. To evaluate fracture behavior modified by HDPEC, critical fracture parameters such as fracture strength, fracture toughness, and fracture profile of crack tip are important criteria. This work investigates the finite element analysis (FEA) based evaluation of improved fracture characteristics by the application of HDPEC in a SUS 316 austenite stainless steel. Tensile tests were first conducted to deduce the modified material properties with different conditions of HDPEC. A series of theoretical considerations was employed to estimate the modified fracture toughness. The relationship between critical fracture strength and critical crack length was numerically determined based on the estimated fracture toughness. The results in FEA showed that critical von Mises stress on the singularity at the crack tip increases as the effect of HDPEC increases. The evolution of increased fracture toughness with respect to conditions of HDPEC was specified. Crack opening profiles were simulated to assist the explanation. The evaluation of fracture parameters in this study proposes that the modified material properties by HDPEC play a positive role to resist crack propagation.

    DOI: 10.2320/matertrans.MT-M2020333

    Web of Science

    Scopus

    CiNii Article

  9. True origin of the size effect in cold-welded metallic nanocrystals 査読有り

    Cui Y.

    International Journal of Mechanical Sciences   187 巻   2020年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.ijmecsci.2020.106102

    Scopus

  10. High-strain-rate void growth in high entropy alloys: Suppressed dislocation emission = suppressed void growth 査読有り 国際誌

    Cui Yi, Toku Yuhki, Kimura Yasuhiro, Ju Yang

    SCRIPTA MATERIALIA   185 巻   頁: 12 - 18   2020年8月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Scripta Materialia  

    Void growth, as a critical stage in ductile fracture, could play some important role in the ductility of high entropy alloys (HEAs). Under a high-strain-rate tension (strain rate: 0.1~0.4/ns), our atomistic simulations reveal a severely suppressed growth of void (initial diameter: 4.0~9.1 nm) in HEAs at a low temperature, compared with that in Ni metal or Ni-based binary alloys. The emission of unclosed glide loops is found critical to void growth. Void growth is suppressed, once dislocation emission is suppressed due to the solute drag effect. Regarding the alloying elements, we find the void suppression relevance as Fe>Co and Cr>Fe>Mn.

    DOI: 10.1016/j.scriptamat.2020.03.056

    Web of Science

    Scopus

  11. Fabrication of γ-Fe<sub>2</sub>O<sub>3</sub> Nanowires from Abundant and Low-cost Fe Plate for Highly Effective Electrocatalytic Water Splitting. 査読有り

      10 巻 ( 1 ) 頁: 5407   2020年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/s41598-020-62259-6

    PubMed

  12. Adhesion Properties of Nanowire Surface Fastener 査読有り

    Toku Y., Ju Y.

    MHS 2019 - 30th 2019 International Symposium on Micro-NanoMechatronics and Human Science     2019年12月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:MHS 2019 - 30th 2019 International Symposium on Micro-NanoMechatronics and Human Science  

    The power devices that are attracting attention in the recent development of electric vehicles, specifically, SiC and GaN power devices (power semiconductors) are expected as key technologies for the 21st century because of high current control and high-frequency operation. However, because of the operating temperature exceeds 300 degrees due to high power, thermal damage on the mounting part of the electronic package cannot be prevented by the present solder technique. We recently developed a metallic nanowire surface fastener (NSF) to resolve the abovementioned problems (Fig. 1). This fastener can be used to connect electronic components on a substrate at room temperature using the van der Waals force between each nanowire. The NSF would be expected to apply huge filed such as wearable devices, assembling of power devices in the inverter of electronic vehicle. This study demonstrates a 64-pin NSF that behaves like a ball grid array for application to actual electronic devices. Additionally, we demonstrate the fabrication of NSF on the flexible substrate. Through the comparison of above both, the adhesion mechanism of NSF is discussed in this present study. We also introduce how to control the adhesion morphology to improve the adhesion strength, electronic conductivity, and thermal conductivity of the NSF.

    DOI: 10.1109/MHS48134.2019.9249283

    Scopus

  13. The optimal mechanical condition in stem cell-to-tenocyte differentiation determined with the homogeneous strain distributions and the cellular orientation control 査読有り 国際誌

    Morita Yasuyuki, Sato Toshihiro, Higashiura Kouji, Hirano Yusho, Matsubara Fuga, Oshima Kanau, Niwa Koji, Toku Yuhki, Song Guanbin, Luo Qing, Ju Yang

    BIOLOGY OPEN   8 巻 ( 5 )   2019年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Biology Open  

    DOI: 10.1242/bio.039164

    Web of Science

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    PubMed

  14. tLyP-1-conjugated core-shell nanoparticles, Fe <inf>3</inf> O <inf>4</inf> NPs@mSiO <inf>2</inf> , for tumor-targeted drug delivery 査読有り

    Morita Y.

    Applied Surface Science   474 巻   頁: 17-24   2019年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.apsusc.2018.09.205

    Scopus

  15. Highly sensitive hydrogen sensor based on a new suspended structure of cross-stacked multiwall carbon nanotube sheet 査読有り 国際誌

    Yan Keyi, Toku Yuhki, Ju Yang

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   44 巻 ( 12 ) 頁: 6344 - 6352   2019年3月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:International Journal of Hydrogen Energy  

    In this research, we proposed a highly sensitive hydrogen sensor based on a new suspended structure of cross-stacked multiwall carbon nanotube (MWCNT) sheet. MWCNT sheet is a kind of CNT film which has a super-high CNT alignment and can be easily prepared by drawing from the spinnable CNT array in large scales. By stacking the sheets onto an electrode with a 1 × 1 cm hole in mutually perpendicular directions, sensors with suspended cross-stacked structure were realized. Afterwards, a two-side Pd functionalization was introduced. The effects of suspended structure, cross-stacked structure and two-side Pd functionalization were investigated respectively. It was observed that the sample with 2 + 1 layers of cross-stacked MWCNT sheet and two-side 3 nm Pd deposition showed the best gas sensing performance with a relative resistance change of 35.30% at 4% H2. This result indicates that the proposed sensor is one of the best among all reported MWCNT based hydrogen sensors. The method demonstrated in this research gives a potential solution for the mass production of CNT-based sensors with high sensitivity and reliability.

    DOI: 10.1016/j.ijhydene.2019.01.055

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    Scopus

  16. Local permittivity measurement of dielectric materials based on the non-contact force curve of microwave atomic force microscopy. 査読有り

    Tong B, Zhao M, Toku Y, Morita Y, Ju Y

    The Review of scientific instruments   90 巻 ( 3 ) 頁: 033706   2019年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1063/1.5066599

    PubMed

  17. A 64-pin Nanowire Surface Fastener Like a Ball Grid Array Applied for Room-temperature Electrical Bonding. 査読有り

    Toku Y, Ichioka K, Morita Y, Ju Y

    Scientific reports   9 巻 ( 1 ) 頁: 1095   2019年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/s41598-018-37693-2

    PubMed

  18. Effect of electropulsing treatment on the fatigue crack growth behavior of copper 査読有り

    Yin Y.

    Materials   11 巻 ( 11 )   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3390/ma11112168

    Scopus

    PubMed

  19. Fabrication of multiwall carbon nanotube sheet based hydrogen sensor on a stacking multi-layer structure 査読有り 国際誌

    Yan Keyi, Toku Yuhki, Morita Yasuyuki, Ju Yang

    NANOTECHNOLOGY   29 巻 ( 37 )   2018年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1088/1351-6528/aace96

    Web of Science

  20. Nanowire surface fastener fabrication on flexible substrate 査読有り

    Toku Yuhki, Uchida Keita, Morita Yasuyuki, Ju Yang

    NANOTECHNOLOGY   29 巻 ( 30 )   2018年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1088/1361-6528/aac284

    Web of Science

  21. Synthesis of a single-crystal Fe2O3 nanowire array based on stress-induced atomic diffusion used for solar water splitting 査読有り

    Xie Yiyuan, Ju Yang, Toku Yuhki, Morita Yasuyuki

    ROYAL SOCIETY OPEN SCIENCE   5 巻 ( 3 )   2018年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1098/rsos.172126

    Web of Science

  22. Use of a tendon/ligament cell sheet with mesenchymal stem cells and cyclic stretch stimulus for tendon/ligament tissue restoration 査読有り

    Morita Y., Matsubara F., Toku Y., Ju Y.

    Journal of Mechanical Engineering   5 巻 ( Specialissue3 ) 頁: 1 - 11   2018年2月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Mechanical Engineering  

    It can be relatively difficult for damaged tendon or ligament tissue to heal perfectly due to the inability to self-cure. Therefore, tendon and ligament tissue engineering has been used as a restorative method. Perfect tissue restoration, however, has yet to be achieved. In other research, cell sheets have been applied to various different types of tissues and organs for regeneration. In this study, we attempted to fabricate a tendon/ligament cell sheet for use in tissue engineering. Firstly, human bone marrow mesenchymal stem cells (hBMSCs), which have excellent proliferative abilities, were harvested and formed into a cell sheet. Then, a cyclic stretching stimulus was applied to the hBMSC sheet to enhance cell differentiation into tendon/ligament cells. The results showed that the work was successful in promoting differentiation, resulting in a tendon/ligament cell sheet. These results suggest that this method is effective for tendon/ligament tissue engineering.

    Scopus

  23. Optimization of differentiation time of mesenchymal-stem-cell to tenocyte under a cyclic stretching with a microgrooved culture membrane and selected measurement cells 査読有り 国際誌

    Morita Y., Yamashita T., Toku Y., Ju Y.

    Acta of Bioengineering and Biomechanics   20 巻 ( 1 ) 頁: 3 - 10   2018年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Acta of Bioengineering and Biomechanics  

    Purpose: There is a need for efficient stem cell-to-tenocyte differentiation techniques for tendon tissue engineering. More than 1 week is required for tenogenic differentiation with chemical stimuli, including co-culturing. Research has begun to examine the utility of mechanical stimuli, which reduces the differentiation time to several days. However, the precise length of time required to differentiate human bone marrow-derived mesenchymal stem cells (hBMSCs) into tenocytes has not been clarified. Understanding the precise time required is important for future tissue engineering projects. Therefore, in this study, a method was developed to more precisely determine the length of time required to differentiate hBMSCs into tenocytes with cyclic stretching stimulus. Methods: First, it had to be determined how stretching stimulation affected the cells. Microgrooved culture membranes were used to suppress cell orientation behavior. Then, only cells oriented parallel to the microgrooves were selected and evaluated for protein synthesis levels for differentiation. Results: The results revealed that growing cells on the microgrooved membrane and selecting optimally-oriented cells for measurement improved the accuracy of the differentiation evaluation, and that hBMSCs differentiated into tenocytes in approximately 10 h. Conclusions: The differentiation time corresponded to the time required for cellular cytoskeleton reorganization and cellular morphology alterations. This suggests that cells, when subjected to mechanical stimulus, secrete mRNAs and proteins for both cytoskeleton reorganization and differentiation.

    DOI: 10.5277/ABB-00927-2017-04

    Web of Science

    Scopus

  24. ELECTROMAGNETIC PERFORMANCE OF SPIRALLY DEFORMED COATED NANOWIRES 査読有り

    Toku Yuhki, Ueda Yuji, Morita Yasuyuki, Ju Yang

    IRF2018: PROCEEDINGS OF THE 6TH INTERNATIONAL CONFERENCE ON INTEGRITY-RELIABILITY-FAILURE     頁: 347 - 348   2018年

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    掲載種別:研究論文(学術雑誌)  

    Web of Science

  25. ELECTROMAGNETIC PERFORMANCE OF SPIRALLY DEFORMED COATED NANOWIRES 査読有り

    Yuhki Toku, Yuji Ueda, Yasuyuki Morita, Yang Ju

    IRF2018: PROCEEDINGS OF THE 6TH INTERNATIONAL CONFERENCE ON INTEGRITY-RELIABILITY-FAILURE     頁: 347 - 348   2018年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:INEGI-INST ENGENHARIA MECANICA E GESTAO INDUSTRIAL  

    In this study, we demonstrated the spiral formation of the metal coated nanowires (NWs). The spiral formation is a self-deformation technique based on the residual stress of the thin film. The NW works as a conductive coil at a nanoscale. The fabricated coil has a diameter of approximately 1-5 mu m and a high conductivity (similar to 2.18 x 10(6) /Omega.m). The conductive coil could be used for electromagnetic sensing according to the principle of electromagnetic induction. Specifically, it could be used for magnetic state observation and control at a nanoscale.

    Web of Science

  26. Evaluation of Local Dielectric Constant of Biomaterial Based on the Force-distance-curve Measured by Microwave Atomic-force Microscope 査読有り

    Zhao M., Tong B., Toku Y., Morita Y., Yang J.

    MHS 2018 - 2018 29th International Symposium on Micro-NanoMechatronics and Human Science     頁: 1 - 5   2018年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:MHS 2018 - 2018 29th International Symposium on Micro-NanoMechatronics and Human Science  

    In recent years, different types of techniques have been developed to observe the cells and extract a wealth of information about their physiological properties. The analysis of the electrical properties requires modeling the cells. However, the cells have complex structures and most of the analytical equations are limited. Therefore, in this laboratory, the microwave detection system is combined with the atomic force microscopy (AFM) to evaluate the local electrical properties of the materials. In this research, a new method to measure the dielectric constant of biomaterials based on microwave was developed on microwave atomic force microscopy (M-AFM). The theoretical model was established to analyze the mechanism of the force caused by microwave and was developed a method to quantitatively measure the dielectric constant. By using this measurement method, the dielectric constant of mesenchymal stem cells (MSCs) was measured.

    DOI: 10.1109/MHS.2018.8886953

    Web of Science

    Scopus

    その他リンク: https://dblp.uni-trier.de/db/conf/mhs/mhs2018.html#ZhaoTTMY18

  27. Enhancement of fatigue life of aluminum alloy affected by the density of pulsed electric current 査読有り

    Jung J., Ju Y., Morita Y., Toku Y.

    INTERNATIONAL JOURNAL OF FATIGUE   103 巻   頁: 419-425   2017年10月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.ijfatigue.2017.06.021

    Web of Science

  28. Fabrication of Fe2O3 nanowire arrays based on oxidation-assisted stress-induced atomic-diffusion and their photovoltaic properties for solar water splitting 査読有り

    Xie Yiyuan, Ju Yang, Toku Yuhki, Morita Yasuyuki

    RSC ADVANCES   7 巻 ( 49 ) 頁: 30548-30553   2017年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c7ra03298f

    Web of Science

  29. Effect of pulsed electric current on the mechanical properties of titanium alloy 査読有り

    Jung J., Inadome Y., Ju Y., Morita Y., Toku Y.

    ICF 2017 - 14th International Conference on Fracture   2 巻   頁: 798 - 799   2017年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ICF 2017 - 14th International Conference on Fracture  

    The mechanical properties of titanium alloy affected by pulsed electric current were investigated. The elongation increased significantly after the application of electric current, while the yield and tensile strength were also increased. To examine the effect of electric current, the microstructures and fracture surfaces were compared before and after the application of electric current. It is concluded that the mechanical properties were improved due to the decrease of grain size and brittleness, and the occurrence of phase transformation.

    Scopus

  30. Effect of Pulsed Electric Current on the Growth Behavior of Fatigue Crack in Al Alloy 査読有り

    J. Jung, Y. Ju, Y. Morita, and Y. Toku

    Procedia Structural Integrity   2 巻   頁: 2989-2993   2016年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  31. Delaying Effect of High-Density Electric Current on Fatigue Crack Growth in A6061-T6 Aluminum Alloy 査読有り

    J. Jung, Y. Ju, Y. Morita, Y. Toku, and Y. Uematsu

    Materials Transactions     頁: 000-000   2016年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  32. Electromagnetic Properties of Microcoils Fabricated from Self-Bending Coated-Nanowires via Viscous Flow of Core Material 査読有り

    Yuhki TOKU, Mikio MURAOKA

    Nanoscience and Nanotechnology Letters   6 巻 ( 7 ) 頁: 561-564   2014年7月

     詳細を見る

    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1166/nnl.2014.1776

  33. Repositioning Technique in Nanowire Manipulation by Oscillating Gripper" 査読有り

    Yuhki TOKU, Kohtaro KOBAYASHI, Mikio MURAOKA

    Micro and Nano Letters   8 巻 ( 2 ) 頁: 63-65   2013年2月

     詳細を見る

    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1049/mnl.2012.0665

  34. Helical Formation of Coated Nanowires by Viscous Flow of Core Material 査読有り

    Yuhki TOKU, Mikio MURAOKA

    Nanoscience and Nanotechnology Letters   2 巻 ( 3 ) 頁: 197-202   2010年

     詳細を見る

    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1166/nnl.2010.1058

▼全件表示

MISC 20

  1. テンプレート法を用いた機能性ナノワイヤ面ファスナの創製 招待有り 査読有り

    徳 悠葵, 巨 陽  

    トライボロジスト66 巻 ( 10 ) 頁: 756 - 761   2021年

     詳細を見る

    担当区分:筆頭著者, 責任著者   記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)   出版者・発行元:一般社団法人 日本トライボロジー学会  

    <p>Surface-mount techniques primarily depend on soldering. However, soldering techniques have encountered some challenges in recent years. The reflow process in electronic assembly needs high-temperature processes, which result in undesired thermal damages and residual stress at a bonding interface. Therefore, there is an urgent requirement to attach electronic parts to circuit boards with good mechanical and electrical properties at room temperature. We recently developed a metallic nanowire surface fastener (NSF) to resolve the abovementioned problems. This fastener can connect electronic components on a substrate at room temperature using the van der Waals force between each nanowire. In this paper, we introduce a preparing method of a high-density nanowire array constituting the NSF. The NSF fabricated through the simple template method showed the room temperature bonding ability. The NSF's adhesion strength and electrical properties were investigated by adjusting the nanowire parameters, such as diameter, length, density (number per area), preload, and shape. We also introduce some NSF applications, such as 64-pin NSF that behaves like a ball grid array for application to actual electronic devices and the fabrication of an NSF on a flexible substrate.</p>

    DOI: 10.18914/tribologist.66.10_756

    CiNii Article

  2. Use of a tendon/ligament cell sheet with mesenchymal stem cells and cyclic stretch stimulus for tendon/ligament tissue restoration 査読有り

    Morita Y  

    Journal of Mechanical Engineering5 巻 ( Specialissue3 ) 頁: 1-11   2018年2月

     詳細を見る

    記述言語:英語   掲載種別:速報,短報,研究ノート等(学術雑誌)  

  3. Optimization of differentiation time of mesenchymal-stem-cell to tenocyte under a cyclic stretching with a microgrooved culture membrane and selected measurement cells 査読有り

    Yasuyuki Morita, Takahiro Yamashita, Yuhki Toku, Yang Ju  

    Acta of Bioengineering and Biomechanics20 巻 ( 1 ) 頁: 3 - 10   2018年

     詳細を見る

    記述言語:英語   掲載種別:速報,短報,研究ノート等(学術雑誌)   出版者・発行元:Institute of Machine Design and Operation  

    Purpose: There is a need for efficient stem cell-to-tenocyte differentiation techniques for tendon tissue engineering. More than 1 week is required for tenogenic differentiation with chemical stimuli, including co-culturing. Research has begun to examine the utility of mechanical stimuli, which reduces the differentiation time to several days. However, the precise length of time required to differentiate human bone marrow-derived mesenchymal stem cells (hBMSCs) into tenocytes has not been clarified. Understanding the precise time required is important for future tissue engineering projects. Therefore, in this study, a method was developed to more precisely determine the length of time required to differentiate hBMSCs into tenocytes with cyclic stretching stimulus. Methods: First, it had to be determined how stretching stimulation affected the cells. Microgrooved culture membranes were used to suppress cell orientation behavior. Then, only cells oriented parallel to the microgrooves were selected and evaluated for protein synthesis levels for differentiation. Results: The results revealed that growing cells on the microgrooved membrane and selecting optimally-oriented cells for measurement improved the accuracy of the differentiation evaluation, and that hBMSCs differentiated into tenocytes in approximately 10 h. Conclusions: The differentiation time corresponded to the time required for cellular cytoskeleton reorganization and cellular morphology alterations. This suggests that cells, when subjected to mechanical stimulus, secrete mRNAs and proteins for both cytoskeleton reorganization and differentiation.

    DOI: 10.5277/ABB-00927-2017-04

    Scopus

  4. 312 機械的伸縮刺激による腱細胞分化に関する1細胞計測(GS3-1 人体の力学挙動・生体計測)

    山下 貴大, 森田 康之, 徳 悠葵, 巨 陽  

    東海支部総会講演会講演論文集2016 巻 ( 0 ) 頁: _312 - 1_-_312-2_   2016年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/jsmetokai.2016.65._312-1_

    CiNii Article

  5. 722 ナノ加工プロセスによるナノワイヤ群のフック形成に関する研究

    徳 悠葵, 草間 美香, 巨 陽  

    機械材料・材料加工技術講演会講演論文集2015 巻 ( 0 ) 頁: _722 - 1_-_722-3_   2015年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/jsmemp.2015.23._722-1_

    CiNii Article

  6. J2220204 応力誘導法による3次元ナノ構造体の作製

    若林 信宏, 徳 悠葵, 巨 陽  

    年次大会2015 巻 ( 0 ) 頁: _J2220204 - -_J2220204-   2015年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    In this study. we suggested simple and easy fabrication technique of flowe-like nanomaterials called Nano Flower (NF) by stress-induced method. From the observation of NFs grown on substrates which have different surface conditions, growth of NFs is probably related to residual stress of surface of substrates. EDS analysis results show that NFs grow up by taking in atmospheric carbon dioxide. NFs are expected as application to carbon dioxide capture and storage.

    DOI: 10.1299/jsmemecj.2015._J2220204-

    CiNii Article

  7. J0610105 ストレスマイグレーションによる超高晶質Alナノワイヤの創製と電気的特性の評価

    柴田 貴俊, 徳 悠葵, 巨 陽, 小島 直樹  

    年次大会2015 巻 ( 0 ) 頁: _J0610105 - -_J0610105-   2015年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    We describe the result of the electrical conductivity measurement of single crystalline aluminum nanowires. These nanowires are fabricated by simply heating the Al samples in air. The growth mechanism is stress-induced migration. Four electrodes were patterned on nanowires by the photolithographic technique and we obtained the resistivity of nanowires by four-terminal measurement. The relationship between electrical conductivity and diameter was examined experimentally.

    DOI: 10.1299/jsmemecj.2015._J0610105-

    CiNii Article

  8. J0610104 マイクロ波原子間力顕微鏡の探針先端における原子間力の評価に関する研究

    一二三 和馬, 徳 悠葵, 巨 陽  

    年次大会2015 巻 ( 0 ) 頁: _J0610104 - -_J0610104-   2015年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    With the development of nanotechnology in recent years, many researchers have focused on the development of nanomaterials and nanostructures such as nanowires. To apply these nanomaterials and nanostructures into nanodevices, there are great needs of the quantitative measurement of electrical properties of materials in an infinitesimal area. Recently, it has been reported that the microwave gives an effect to an interatomic force in local area among materials. Therefore, it is thought that an identification of materials and an evaluation of electrical characteristics become possible by clarifying the relation between microwave and interatomic force. Therefore, we investigated interatomic force under the tip of probe by focusing on the force-distance curve measurement using microwave atomic force microscopy (M-AFM) as the first step. This paper describes the method and the results of the force-distance curve measurement on the sample of Au, Si, and glass. Results of this experiment indicate actually that the effect of microwave is large in material which has high electric conductivity.

    DOI: 10.1299/jsmemecj.2015._J0610104-

    CiNii Article

  9. GS0706-432 ストレスマイグレーションによる単結晶Alナノワイヤの高密度生成

    鈴木 崇真, 徳 悠葵, 森田 康之, 巨 陽  

    M&M材料力学カンファレンス2015 巻 ( 0 ) 頁: _GS0706 - 43-_GS0706-43   2015年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    Nanowires have been expected to be utilized in various applications. Recently, many researchers have reported about single crystal or polycrystalline nanowires where the single crystal nanowires are shown to have a higher conductivity compared to the polycrystalline ones. In our previous study, we investigated the fabrication process of single crystal nanowires by stress migration. However, because the mechanism of fabrication was not clear, the generation density of single crystal nanowires was low for this method. In this study, we suggested a new method to increase the generation density of single crystal nanowires. An etching process was added to the previous fabrication method and the conditions of the substrate surface were changed. By doing this, the stress generated around the concentrated Al atoms was larger than the threshold stress needed to fabricate the nanowires. As a result of the added etching process, we achieved a nanowire generation density 100 times that of the conventional fabrication method.

    DOI: 10.1299/jsmemm.2015._GS0706-43

    CiNii Article

  10. GS0705-431 コアシェルナノワイヤを用いた亜酸化銅太陽電池の作製および評価

    松尾 亮佑, 徳 悠葵, 森田 康之, 巨 陽  

    M&M材料力学カンファレンス2015 巻 ( 0 ) 頁: _GS0705 - 43-_GS0705-43   2015年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    Currently, the solar cells are mainly made of silicon. However, due to the high cost and shortage of silicon, new materials for solar cells are still needed. It has been proved that Cu_2O solar cells have a high theoretical energy conversion efficiency with a very low cost. However, the actual efficiency of Cu_2O solar cell is much lower than theoretical one. In this research, Cu_2O/Cu core-shell nanowires are fabricated on the surface of the solar cell by the template method to increase light receiving area. Then, elemental analysis for core-shell nanowires is carried out by Electron Energy-Loss Spectroscopy. As a result, we succeed in fabricating Cu_2O/Cu core-shell nanowires. The area of the solar cells is increased to about 220 times, which is convinced to improve the solar energy conversion efficiency.

    DOI: 10.1299/jsmemm.2015._GS0705-43

    CiNii Article

  11. F041003 機能性ナノワイヤ面ファスナーの創製

    巨 陽, 徳 悠葵  

    年次大会2015 巻 ( 0 ) 頁: _F041003 - 1-_F041003-3   2015年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    Mass production of surface mount devices (SMDs) relies heavily on reflow soldering and has become the cornerstone of today's electronic industry. However, the traditional reflow soldering technique is characterized by high heating temperatures, toxic solder materials and low recycling rate of SMDs. Here, we introduce a new patterned structure of nanowire arrays named a surface fastener through which cold bonding for surface mount technology can be realized. The mechanical bonding enables normal and shear bonding strengths of more than 5 N/cm^2. Simultaneously, the parasitic resistance of a pair of surface fasteners is only approximately 2Ω. The present technique can be performed at room temperature, thereby improving the process compatibility and reliability of SMDs. Surface fasteners based on high melting point metallic nanowires are temperature-resistant for many critical applications. In addition, bonding without solder material is positive for the recycling of rare metals in SMDs.

    DOI: 10.1299/jsmemecj.2015._F041003-1

    CiNii Article

  12. OS1507 金属被覆により生じるナノワイヤの曲げ変形に関する理論解析

    徳 悠葵, 村岡 幹夫  

    M&M材料力学カンファレンス2014 巻 ( 0 ) 頁: _OS1507 - 1_-_OS1507-2_   2014年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    In this study, we discussed about the effect of film thickness on bending deformation of coated nanowire (NW). The three dimensional theoretical model for analyzing the effect was proposed in this paper. The dependence of the misfit strain on the film thickness was introduced in the model. We concluded that bending direction of the NW varied with increasing the coating film thickness. This result arises from the dependence of the misfit strain on the film thickness and the nonuniform film thickness along the circumference of the NW.

    DOI: 10.1299/jsmemm.2014._OS1507-1_

    CiNii Article

  13. J212014 コア流動法により作製した金属被覆マイクロコイルの発生磁場評価([J212-01]マイクロ・ナノ材料創成とそのデバイス応用(1))

    徳 悠葵, 村岡 幹夫  

    年次大会2013 巻 ( 0 ) 頁: _J212014 - 1-_J212014-2   2013年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    We have proposed a method on helical formation of coated nanowire, which utilized the misfit strain of the film coated on the nanowire. We also adopted a heat treatment that induces a creep flow only in the nanowire and thereby released the constraint of the nanowire on elastic bending due to film strain. In this study, we evaluate the magnetic field of Pt-coated CuO microcoils formed by using the method. A direct current is supplied to the coil on Au electrodes, and the voltage of the coil is measured using four-point probe method. The coil is melted due to a possible reason of joule heating at a current of 700 μA. The measured voltage increases proportionally to the increasing current until the current is 580 μA. Then, the voltage irregularly increases until the electrical discontinuity. We predict that the density of magnetic flux of the coil is 1.2 G at the current of 580 μA. This magnetic field is 3〜4 times of the geomagnetism.

    DOI: 10.1299/jsmemecj.2013._J212014-1

    CiNii Article

  14. 511 金属被覆ナノワイヤの通電による形態変化の観察

    徳 悠葵, 村岡 幹夫  

    機械材料・材料加工技術講演会講演論文集2013 巻 ( 0 ) 頁: _511 - 1_-_511-2_   2013年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/jsmemp.2013.21._511-1_

    CiNii Article

  15. 211 コア流動法によるナノコイル形成に関する理論的検討(材料力学III)

    工藤 隆祐, 徳 悠葵, 村岡 幹夫  

    日本機械学会東北支部秋季講演会講演論文集2013 巻 ( 0 ) 頁: 51 - 52   2013年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/jsmetohoku.2013.49.51

    CiNii Article

  16. 330 コア還元による薄膜の残留応力解放を利用した金属被覆ナノワイヤの微小コイル形成

    徳 悠葵, 村岡 幹夫  

    機械材料・材料加工技術講演会講演論文集2012 巻 ( 0 ) 頁: _330 - 1_-_330-2_   2012年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/jsmemp.2012.20._330-1_

    CiNii Article

  17. OS06-2-4 Manipulation of Nanowires by Chopsticks

    Kobayashi Kohtaro, Toku Yuhki, Muraoka Mikio  

    Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics2011 巻 ( 10 ) 頁: "OS06 - 2-4-1"   2011年9月

     詳細を見る

    記述言語:英語   出版者・発行元:一般社団法人日本機械学会  

    CiNii Article

    CiNii Books

  18. 002 製膜ひずみとコア流動を利用した金属被覆ナノワイヤの曲げ加工(GS1-1 一般セッション)

    徳 悠葵, 村岡 幹夫  

    M&M材料力学カンファレンス2010 巻 ( 0 ) 頁: 258 - 259   2010年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    Various methods have been proposed for fabricating nanocoils in order to extend the range of elements for building nanodevices. Most of these methods are based on self-assembly technique. We have previously demonstrated an alternative method in which a straight nanowire is bent by depositing a thin film on the nanowire. The bending is due to the misfit strain of the coated film. However, nanocoil formation using this method is highly inefficient. In this study, we developed an advanced method in which the helical formation of coated nanowires takes place because of the viscous flow of the core material, i.e., the nanowires, and the misfit strain of the coating film. When the melting temperature of the nanowire material is lower than that of the coating, elevating the temperature induces a viscous flow, i.e., creep, which only occurs in the nanowire. The creep releases the constraint of the nanowire on elastic bending due to film strain.

    DOI: 10.1299/jsmemm.2010.258

    CiNii Article

  19. T0301-1-4 コア流動法によるナノコイル形成の曲率制御([T0301-1]金属ナノ材料の創製と展開(1))

    徳 悠葵, 村岡 幹夫  

    年次大会講演論文集2010 巻 ( 0 ) 頁: 173 - 174   2010年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    Various methods have been proposed for fabricating nanocoils in order to extend the range of elements for building nanodevices. Most of these methods are based on self-assembly technique. We have previously demonstrated an alternative method in which a straight nanowire is bent by depositing a thin film on the nanowire. The bending is due to the misfit strain of the coated film. However, nanocoil formation using this method is highly inefficient. In this study, we developed an advanced method in which the helical formation of coated nanowires takes place because of the viscous flow of the core material, i.e., the nanowires, and the misfit strain of the coating film. When the melting temperature of the nanowire material is lower than that of the coating, elevating the temperature induces a viscous flow, i.e., creep, which only occurs in the nanowire. The creep releases the constraint of the nanowire on elastic bending due to film strain.

    DOI: 10.1299/jsmemecjo.2010.8.0_173

    CiNii Article

  20. 104 コア流動による金属被覆ナノワイヤのコイル形成(学生賞I,一般講演)

    徳 悠葵, 村岡 幹夫  

    東北支部総会・講演会 講演論文集2010 巻 ( 0 ) 頁: 12 - 13   2010年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/jsmeth.2010.45.12

    CiNii Article

▼全件表示

講演・口頭発表等 245

  1. Improvement of Thin Film Adhesion Strength via Current Application 国際会議

    Y. Toku, K. Kizawa, K. Sugiura, Y. Morita and Y. Ju

    Asia-Pacific Conference on Fracture and Strength 2018 

     詳細を見る

    開催年月日: 2018年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Xi'an, China   国名:中華人民共和国  

  2. ELECTROMAGNETIC PERFORMANCE OF SPIRALLY DEFORMED COATED NANOWIRES 国際会議

    Y. Toku, Y. Ueda, Y. Morita and Y. Ju

    Recent Developments in Integrity - Reliability - Failure 

     詳細を見る

    開催年月日: 2018年7月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Lisbon, Portugal   国名:ポルトガル共和国  

  3. Influence of Thermal Fatigue on the Connection Strength of Nanowire Surface Fastener 国際会議

    Y. Toku, S. Nota, Y. Morita, and Y. Ju

    International multi-conference on engineering and technology innovation 2015 

     詳細を見る

    開催年月日: 2016年8月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:New York, USA   国名:アメリカ合衆国  

  4. Fabrication of tiny whiskers on core-shell nanowires based on stress-induced atomic migration 国際会議

    Yuhki TOKU, Mikio MURAOKA, Yang JU

    International multi-conference on engineering and technology innovation 2015 

     詳細を見る

    開催年月日: 2015年10月 - 2015年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Kaohsiung, Taiwan   国名:台湾  

  5. A System for the Fabrication of Metallic Micro/Nanowire Based on Electromigration 国際会議

    ITO Yuta, KIMURA Yasuhiro, TOKU Yuhki, JU Yang

    33rd International Microprocesses and Nanotechnology Conference (MNC2020)  2020年11月9日 

     詳細を見る

    開催年月日: 2020年11月

    記述言語:英語   会議種別:口頭発表(一般)  

  6. 高周波高密度電流が銅薄膜の密着強度に及ぼす影響

    安田 和弘, 木村 康裕, 徳 悠葵, 巨 陽

    年次大会 

     詳細を見る

    開催年月日: 2020年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Stainless alloy is widely used in implants, dams and bridges because of its high corrosion resistance. However, these structures can be exposed to loads during their useful life and cause plastic deformation. Therefore, it is essential to know the plastic strain of the material in order to control the quality of the product. The conventional way to measure strain is the strain gauge method, but since physical contact is required at the time of gage attachment, a method to measure strain in non-contact fashion is required. Therefore, in this research, we focused on microwaves often used in nondestructive testing. Microwaves have less influence on the human body compared to X-ray. Unlike ultrasonic waves, microwaves do not require a transmission medium and can propagate in air favorably and at high speed. Therefore, we used microwaves to measure the electrical resistivity of plastically deformed test pieces. As a result, correlations were confirmed between the measured electrical resistivity and strain, and it was shown that the strain of stainless steel could be evaluated from the measured electrical resistivity.</p>

    DOI: 10.1299/jsmemecj.2019.J40136P

    CiNii Article

  7. エレクトロマイグレーションによる金属マイクロ・ナノワイ ヤ創製のための機構開発

    伊藤 佑太, 木村 康裕, 徳 悠葵, 巨 陽

    年次大会 

     詳細を見る

    開催年月日: 2020年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Stainless alloy is widely used in implants, dams and bridges because of its high corrosion resistance. However, these structures can be exposed to loads during their useful life and cause plastic deformation. Therefore, it is essential to know the plastic strain of the material in order to control the quality of the product. The conventional way to measure strain is the strain gauge method, but since physical contact is required at the time of gage attachment, a method to measure strain in non-contact fashion is required. Therefore, in this research, we focused on microwaves often used in nondestructive testing. Microwaves have less influence on the human body compared to X-ray. Unlike ultrasonic waves, microwaves do not require a transmission medium and can propagate in air favorably and at high speed. Therefore, we used microwaves to measure the electrical resistivity of plastically deformed test pieces. As a result, correlations were confirmed between the measured electrical resistivity and strain, and it was shown that the strain of stainless steel could be evaluated from the measured electrical resistivity.</p>

    DOI: 10.1299/jsmemecj.2019.J40136P

    CiNii Article

  8. Adhesion Properties of Nanowire Surface Fastener 招待有り

    Toku Y.

    MHS 2019 - 30th 2019 International Symposium on Micro-NanoMechatronics and Human Science 

     詳細を見る

    開催年月日: 2019年12月

    記述言語:日本語   会議種別:口頭発表(基調)  

    DOI: 10.1109/MHS48134.2019.9249283

    Scopus

  9. がん関連線維芽細胞ががん細胞の浸潤力学場に及ぼす影響

    大島 叶, 森田 康之, 大内田 研宙, 徳 悠葵, 巨 陽

    バイオエンジニアリング講演会講演論文集 

     詳細を見る

    開催年月日: 2019年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmebio.2019.31.2F22

    CiNii Article

  10. DVC Measurement on the Deformation Field of ECM Surrounding a Tumor Spheroid During the Invasive Progression 国際会議

    Morita Yasuyuki, Nakano Yusuke, Oshima Kanau, Toku Yuhki, Ju Yang

    Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 

     詳細を見る

    開催年月日: 2019年

    記述言語:英語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmeatem.2019.1009D1000

    CiNii Article

  11. 機械的伸縮刺激を用いた間葉系幹細胞の腱細胞分化誘導に対する伸縮波形の影響

    丹羽 光司, 森田 康之, 徳 悠葵, 巨 陽

    生体医工学 

     詳細を見る

    開催年月日: 2019年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>幹細胞に伸縮刺激を与えると機能亢進が起こる. そのメカニズムは明らかにされていないが, 近年の研究で伸縮周波数が大きな影響を持つことが示唆されている. 本研究では腱細胞への分化に焦点をあて,遺伝子発現量を観察することで, 間葉系幹細胞の腱分化特性を評価する. 初めに,伸縮刺激を各細胞に一様に加えることを目的に細胞培養膜を作製し, 細胞の配向を制御した. その後, 周波数を0.1~10Hzと広域に設定し, 伸縮実験を行った.その結果,腱組織の生理環境に近い0.1および1Hzの領域で大きな遺伝子発現が見られた.</p>

    DOI: 10.11239/jsmbe.Annual57.S25_1

    CiNii Article

  12. がん細胞浸潤挙動に対する細胞外基質弾性率の影響

    牛田 雅人, 森田 康之, 大島 叶, 徳 悠葵, 巨 陽

    年次大会 

     詳細を見る

    開催年月日: 2019年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Cancer cells are known to lead human death, but they are difficult to treat. The reason is that the mechanism of metastasis has not been elucidated. Since cancer cells are known to induce the hardening and moving surrounding tissues i.e. extracellular matrix (ECM), this study aimed to increase the elastic modulus of ECM without changing the density of collagen fibers. The crosslinking agent (EDCNHS) was used for this purpose. By making collagen gel with administering the crosslinking agent, it was succeeded to increase the elastic modulus of ECM up to 5 times approximately than the case without crosslinking agent. Based on this result, it is possible to observe the infiltration behavior of cancer cells with the difference of elastic modulus under three-dimensional culture by enclosing cancer cells in the collagen gel.</p>

    DOI: 10.1299/jsmemecj.2019.J02303

    CiNii Article

  13. マイクロ波を用いたステンレス合金の非接触ひずみ計測

    伊藤 篤志, 徳 悠葵, 巨 陽

    年次大会 

     詳細を見る

    開催年月日: 2019年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Stainless alloy is widely used in implants, dams and bridges because of its high corrosion resistance. However, these structures can be exposed to loads during their useful life and cause plastic deformation. Therefore, it is essential to know the plastic strain of the material in order to control the quality of the product. The conventional way to measure strain is the strain gauge method, but since physical contact is required at the time of gage attachment, a method to measure strain in non-contact fashion is required. Therefore, in this research, we focused on microwaves often used in nondestructive testing. Microwaves have less influence on the human body compared to X-ray. Unlike ultrasonic waves, microwaves do not require a transmission medium and can propagate in air favorably and at high speed. Therefore, we used microwaves to measure the electrical resistivity of plastically deformed test pieces. As a result, correlations were confirmed between the measured electrical resistivity and strain, and it was shown that the strain of stainless steel could be evaluated from the measured electrical resistivity.</p>

    DOI: 10.1299/jsmemecj.2019.J40136P

    CiNii Article

  14. CAF が細胞外マトリックスを介してがん細胞の浸潤場に与える力学的影響

    大島 叶, 森田 康之, 大内田 研宙, 徳 悠葵, 巨 陽

    バイオエンジニアリング講演会講演論文集 

     詳細を見る

    開催年月日: 2019年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmebio.2019.32.1F14

    CiNii Article

  15. 高密度パルス電流を利用したチタン合金の機械的特性の向上

    岩瀬 累, 木村 康裕, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2019年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Titanium alloys have been widely used in versatile productions due to their excellent mechanical properties. Conversely, the effective technique for the improvement of mechanical properties is required. Although heat treatment is used to enhance the mechanical properties, it increases processing cost. Recently, high-density pulsed electric current (HDPEC) has been studied for repairing defects and damages in metallic materials. Therefore, it would be expected to improve mechanical properties of Titanium alloy by applying HDPEC instead of heat treatment. This work studied the effect of HDPEC on the mechanical properties of Titanium alloy Ti-6Al-4V. Tensile test was conducted after applying HDPEC to the material. The application of HDPEC contributes to improve the elongation and tensile strength of 10% and 3.2% compared to unapplied ones, respectively. In addition, Vickers hardness was decreased with increasing current density. The change in the microstructure of the material before and after applying HDPEC was observed based on the X-ray diffraction analysis: The rate of <i>β</i>-phase in the material was increased by applying HDPEC. As a result, the mechanical properties of titanium alloy were improved by applying HDPEC due to the phase transformation.</p>

    DOI: 10.1299/jsmemm.2019.OS0326

    CiNii Article

  16. 高周波高密度電流を利用したAu薄膜の密着強度の向上

    木澤 蔵馬, 木村 康裕, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2019年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In recent years, electronic devices have remarkably achieved miniaturization and high performance with the development of MEMS. In addition, the current density in the interconnect has risen due to the increase of electric energy accompanying the development of power devices. The delamination of thin film due to thermal stress and electromigration has become a problem. One method to improve the adhesion strength of thin film on a substrate is using an adhesion layer such as Cr or Ti between the thin film and the substrate. However, this method has the disadvantages that additional materials are required and the thickness of the interconnect increases. The adhesion strength of the thin film needs to be improved itself. This study proposed a method to apply high-density current with high frequency to thin film to improve the adhesion strength of it. The Au thin film (Size: 5 mm×45 mm×150 nm) was deposited on a glass substrate by radio frequency sputtering. Then, high-density current with high frequency was applied in thin film and the adhesion strength was measured by using peel test. As a result, the adhesion strength was improved by 20% or greater by applying high-density current with high frequency. Therefore, this method is expected to be a new strength improvement method for thin film.</p>

    DOI: 10.1299/jsmemm.2019.OS1409

    CiNii Article

  17. 温度応答性高分子を応用した機能性 DDS の開発

    小林 耕大, 森田 康之, 徳 悠葵, 巨 陽

    バイオエンジニアリング講演会講演論文集 

     詳細を見る

    開催年月日: 2019年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmebio.2019.32.2D23

    CiNii Article

  18. 温度応答性高分子を利用した放出制御型DDSキャリアの開発

    小林 耕大, 森田 康之, 脇本 卓摩, 木村 康裕, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2019年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Drug delivery system (DDS) is able to realize the treatment of cancer with lower side effects and higher efficiency comparing to conventional chemotherapy by controlling the in vivo dynamics of drugs. In recent years, there are many studies regarding to the release control of anticancer drug loaded in DDS in order to enhancing its performance. However, so far the reported controllable drug release DDSs require external stimulation such as light and cooling as triggers for drug release, which cannot reach the deep part inside the human body. To control the release in the deep part inside the human body, here, we aimed at to develop a new DDS carrier which can control drug release by applying magnetic field. Magnetic mesoporous silica (MMS) and ureido-containing poly (allylamine-co-allylurea) copolymers (PAU) were used in this study. PAU is a kind of polymer having upper critical temperature. By modifying it to the surface of magnetic mesoporous silica, it is possible to realize the control of drug release of the DDS carrier triggered by the core heat generation induced by an alternating magnetic field, thereby realizing the control of drug release in the deep part inside the human body. DDS carrier developed in this research enables highly efficient treatment that combines hyperthermia with core heat generation and drug treatment with drug release at the cancer in the body. To synthesize PAU modified MMS (MMS-PAU), magnetite was prepared by thermal decomposition method and MMSs were synthesized by a template method. PAU was prepared by reacting polyallylamine with potassium cyanate. Finally, PAU was grafted on the surface of MMS by introducing amide bonds. We confirmed that MMS-PAU has the drug release control ability and MMS-PAU is effective for cancer therapy.</p>

    DOI: 10.1299/jsmemm.2019.GS25

    CiNii Article

  19. カーボンナノチューブシートを用いたフレキシブル透明導電膜の開発

    田口 託土, 木村 康裕, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2019年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In Recent years, the demand of transparent conductive films (TCFs) has been increased widely due to the potential application for electronic devices, such as touch panels, liquid crystal displays, and transparent electrodes. With the development of flexible devices, TCFs are required to be flexible. However, indium tin oxide (ITO), the most widespread material used for TCFs, is brittle ceramic material and expensive. Therefore, instead of ITO, TCF materials have to be flexible and low cost. Multiwalled carbon nanotubes (CNT) sheet has been studied as a replacement for ITO owing to its flexibility and low cost. However, the sheet resistance of CNT sheet is still higher than that of ITO: the values of 1000to 1500 Ω/□. One of the reasons is the contact resistance of each other of CNTs in a CNT sheet. In this study, metal nanoparticles were coated on the CNT sheet to reduce the contact resistance. After being coated with Cu/Ni, the contact resistance was modified and the sheet resistance was reduced to 300 Ω/□ or less, while the transmittance at the wave length of 550 nm maintains 80 % or higher. The results provide that CNT sheet is a promising candidate for flexible TCF material, realizing more effective production at lower cost than ITO.</p>

    DOI: 10.1299/jsmemm.2019.GS24

    CiNii Article

  20. Cu<sub>2</sub>Oナノ構造体の形状最適化および表面修飾による太陽光水分解変換効率の向上

    泉 友里, 木村 康裕, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2019年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Recently, Cu<sub>2</sub>O has been considered as an attractive material for solar water splitting due to its excellent characteristics such as small bandgap, visible light adsorption, abundance, and nontoxicity. The theoretical solar-to-hydrogen conversion efficiency (STH) of Cu<sub>2</sub>O is 18% for water splitting. To date, the value experimentally obtained by previous works has not attained and overcomed above ideal value, because of the lack of Cu<sub>2</sub>O in photocathode to absorb sunlight efficiently, the short diffusion length of minority cariers, and the Cu<sub>2</sub>O photocorrosion during water splitting. 3D nanostructures for water splitting and surface modification contribute to resolving these issues. Nanostructures can improve STH owing to high surface-to-volume ratio and short diffusion length for carrier transport compared with bulk materials. In addition, surface modification enables to promote the separation of photogenerated electron-hole pair and to protect the photoelectrode against photocorrosion, and thus resulting in the enhancement of stability in Cu<sub>2</sub>O photocathode. The present study aimed to improve STH and stability in Cu<sub>2</sub>O photocathode for water splitting by optimizing morphology of Cu<sub>2</sub>O nanostructures and surface modification. In order to determine the suitable conditions for water splitting, the relationship between the morphology of the structure and STH was examined. The photocathode with Cu<sub>2</sub>O nanostructures exhibited maximum photocurrent density of 4.58 mA/cm<sup>2</sup> at a potential of 0 V vs. reversible hydrogen electrode (RHE) and STH of 5.63%. Besides, surface modification was successfully introduced by covering nanostructures with homogeneous and conformal layers formed by atomic layer deposition (ALD).</p>

    DOI: 10.1299/jsmemm.2019.GS11

    CiNii Article

  21. CAF共培養下におけるがん細胞周囲の力学場および線維構造の三次元計測

    大島 叶, 森田 康之, 大内田 研宙, 木村 康裕, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2019年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Invasion of cells plays a major role in metastasis. Cancer cells interact with cancer-associated fibroblasts (CAFs) present in the tumor microenvironment and as a result enhance their invasive ability. However, the overall mechanism of the interaction has not been clarified. When cancer cells moving, they constantly exert power on the surrounding extracellular matrix (ECM). In addition, the material properties of the ECM are not uniform because the fiber structure constantly changes. Therefore, measuring the mechanical field around cancer cells is significant in revealing the interaction between cancer cells and CAFs. In this study, we analyze what kind of change is caused in the mechanical field of ECM around a cancer cell by the effects of CAFs under three dimensional culture. We cultured the pancreatic ductal carcinoma cells, SUIT-2 with the orthotopic CAFs in collagen gel. Three-dimensional images were acquired by a confocal microscope. Embedding the fluorescent beads in the gel at the same time, the beads adhere to the collagen and form a pattern, therefore it is possible to track the displacement field by using the digital volume correlation (DVC) method. At the same time, the collagen fiber density and orientation were evaluated based on 3D images. As a result, accumulation and arrangement of collagen fibers were observed in the direction of CAF protrusion, and it became clear that cancer cells under the influence of CAFs generate a dynamic field in a wider range.</p>

    DOI: 10.1299/jsmemm.2019.OS0509

    CiNii Article

  22. Evaluation of Local Dielectric Constant of Biomaterial Based on the Force-distance-curve Measured by Microwave Atomic-force Microscope

    Zhao M.

    MHS 2018 - 2018 29th International Symposium on Micro-NanoMechatronics and Human Science 

     詳細を見る

    開催年月日: 2018年12月

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1109/MHS.2018.8886953

    Scopus

  23. Cu<sub>2</sub>O三次元ナノ構造体の創製と水分解光電極への応用

    泉 友里, 徳 悠葵, 森田 康之, 巨 陽

    年次大会 

     詳細を見る

    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmemecj.2018.J2220104

    CiNii Article

  24. 電気塑性効果を利用したステンレス合金の機械的特性の向上

    岩瀬 累, 徳 悠葵, 森田 康之, 巨 陽

    年次大会 

     詳細を見る

    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmemecj.2018.J0450402

    CiNii Article

  25. 異なる細胞外基質弾性率での幹細胞分化過程における力学場計測

    森田 康之, 山本 陵介, 徳 悠葵, 巨 陽

    年次大会 

     詳細を見る

    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmemecj.2018.J0270101

    CiNii Article

  26. 放出制御型DDSの目指したコアシェル型ナノ粒子への温度応答性高分子の利用

    小林 耕大, 森田 康之, 脇本 卓摩, 徳 悠葵, 巨 陽

    年次大会 

     詳細を見る

    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmemecj.2018.J0220304

    CiNii Article

  27. カーボンナノチューブアレイの密度および配向性制御によるカーボンナノチューブシート紡績性の向上

    田口 託土, 徳 悠葵, 森田 康之, 巨 陽

    年次大会 

     詳細を見る

    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmemecj.2018.J2220103

    CiNii Article

  28. 油滴メカニカルセンサを用いたがん細胞集団の応力測定

    梅井 航, 森田 康之, 徳 悠葵, 巨 陽

    バイオフロンティア講演会講演論文集 

     詳細を見る

    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmebiofro.2018.29.1B16

    CiNii Article

  29. 高密度電流を利用したAu薄膜の密着強度の向上

    木澤 蔵馬, 徳 悠葵, 巨 陽

    機械材料・材料加工技術講演会講演論文集 

     詳細を見る

    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmemp.2018.26.721

    CiNii Article

  30. SnO<sub>2</sub>ナノベルトの形状・密度制御に関する研究

    戸川 陽介, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In recent years, various nanostructure materials such as nanowires, nanorods and nanobelts have been studied widely due to their excellent properties. Especially, much attention was paid by researchers in the preparation of oxide nanostructure materials due to their good optical and electrical properties. Numerous oxide nanostructure materials were synthesized so far, among which SnO<sub>2</sub> is considered to be an important one, because it is a typical n-type semiconductor. Particularly, SnO<sub>2</sub> nanobelts exhibited extensive optoelectronic and gas-sensitive properties which make them being excellent candidates for a wide range of applications such as gas sensors and transparent conductive film. SnO<sub>2</sub> nanobelt is generally synthesized by thermal evaporation method, but it is difficult to control the shape, size and density of SnO<sub>2</sub> nanobelts in the thermal evaporation process. However, since the elastic modulus and conductivity of the nanobelt depend on its shape and size, it is important to control shape and size of nanobelt. Hence, in this study, we adjusted experimental parameters such as pressure during heating and concentrations of gold nanoparticle solution to control the shape and size of nanobelts. From the scanning electron microscope image, we found that the aspect ratio of cross-section was controlled by pressure during heating. The results show that we succeeded in controlling the aspect ratio of cross-section and density of the SnO<sub>2</sub> nanobelts. From the above, it is expected that the improvement of flexibility and transparency of a transparent conductive film could be realized.</p>

    DOI: 10.1299/jsmemm.2018.GS0205

    CiNii Article

  31. がん細胞スフェロイドが浸潤する際の細胞外マトリックスの応力場計測

    中野 優亮, 森田 康之, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス 

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    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>When tumor cells metastasize, invasion of cells plays a major role. The tumor cells initiate invasion by generating force and changing the physical structure of the extracellular matrix (ECM) surrounding the tumor. However, the detail process of changing the structure of the ECM has not been elucidated. At this time, measuring the mechanics field generated in the ECM is an important way to understand behavior of tumor cells in 3D. Therefore, in this study, spheroids, which are the source of the invasion as a tumor cells, were embedded in a collagen gel, and the deformations of the collagen gel surrounding the spheroids were measured. Using the DVC method, the matrix deformations around spheroids were measured by tracking the 3D positions of fluorescent beads embedded in the collagen gel. To photograph the initial state of the ECM, we added tritonX-100 to the spheroid at the end of the experiment and photographed the state of no stress from the spheroid. In addition, we calculated the divergence of the deformations field and discussed on density change of ECM. As a result, it was found that spheroids systematically generate the deformation field and change the density of ECM. It was suggested that invasion occurs in the low density part.</p>

    DOI: 10.1299/jsmemm.2018.OS0610

    CiNii Article

  32. 熱酸化および還元プロセスによるCu<sub>2</sub>Oナノワイヤアレイの創製と太陽光水分解への応用

    Yiqi ZHANG, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス 

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    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>It is well-known that traditional fossil energy sources such as oil are limited. Hydrogen is attracting the attention of the world because it is renewable, plentiful in supply, clean and non-toxic. Cu<sub>2</sub>O is a promising material for solar water splitting because it has an impressive performance as photocathode. It is a p-type semiconductor and with a band gap of 2.0 eV, which could theoretically deliver a solar to hydrogen conversion efficiency of 18% for water splitting. In this research, we use tube furnace to fabricate Cu<sub>2</sub>O nanowire (NW) by thermal oxidation and reduction process of thin copper plate. Different experimental conditions (temperature, time and gas flow rate) were investigated to find out the best parameters for nanowire synthesis (diameter, length, and number density of NW) which is better for the photoelectrochemical system.</p>

    DOI: 10.1299/jsmemm.2018.GS0302

    CiNii Article

  33. 透明導電膜作製に向けた応力誘導原子拡散による単結晶Alナノワイヤアレイの創製

    田中 悠貴, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス 

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    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In recent years, the development of a transparent conductive film using metal nanowires (NW) as a dispersing material has been carried out. Recent studies have reported many methods for fabricating transparent conductive films using Ag NW. However, Ag is a rare metal and there is a problem that the price is susceptible to market fluctuations. In order to utilize inexpensive Al NW as a new dispersing material, we developed a single crystal Al NW array fabrication method. The present method utilizes atomic diffusion to convert Al atoms to NW shape. Compressive stress and stress gradient in the Al thin film which is generated due to the difference in linear expansion coefficient between Al and Si when heating the Al / Si substrate. The atomic diffusion phenomenon caused by such stress is called stress migration (SM). It is a major feature of this method that NW generation is possible with two simple steps, film formation and heating. However, this method has a problem that the generation density of Al NW is low. In this research, we tried to increase the stress gradient by partial etching of Al film and introduce adhesion intermediate layer, and tried to improve generation density. As a result, we could get high density of Al NW with etching depth 10 nm and Cr film thickness 1.5 nm.</p>

    DOI: 10.1299/jsmemm.2018.GS0301

    CiNii Article

  34. 酸化亜鉛薄膜を用いた多点型微小圧力検出センサの開発

    河合 航大, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス 

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    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Cancer is one of the three major causes of death in Japan. The 90% of patients with cancer dies from metastasis. Therefore, it is essential to do the cancer treatment properly, in which the metastasis should be prevented or the place should be predicted where the cancer cells are going to spread to. However, the mechanical mechanism of metastasis is still under research. We attempt to develop a pressure sensor array that can continuously measure the force of nN order generated by the cancer cells in a distributed manner. The requirements that a pressure sensor array need to meet are as follows: the pressure sensor array must adhere to the surface of a cancer cell via many points, besides, it could measure the magnitude of the force (nN). The zinc oxide (ZnO) thin film, as the piezoelectric material, offers a desirable approach to fulfilling the need for measurement of the mechanical field generated by the cancer cells. In our research, we fabricated a set of plural sensors (Size: 100 μm×100 μm, Thickness: 1 μm) on a substrate by using the methods of sputtering and photolithography. In other words, we developed a multi-point pressure sensor array. The main purpose of this study is to evaluate the sensitivity of the sensor, we used Au or Cr buffer layers, on which the ZnO thin film was formed, to find out the influence of the sensitivity of the sensor. Moreover, we measured the output voltage as a function of the load by using the sensor. In summary, the result of experiments shows that the sensitivity of the sensor is 5.31 mV/N.</p>

    DOI: 10.1299/jsmemm.2018.GS0204

    CiNii Article

  35. 銅ナノワイヤ面ファスナーの接着強度向上に向けた影響因子の最適化

    加藤 大博, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In recent years, connecting techniques using conductive nanomaterials imitating gecko's feet, for example, metal nanowires, carbon nanotubes and conductive polymer materials as a surface fastener have been reported. These connecting techniques utilize van der Waals force generated between the surfaces of nanomaterials. Recently, we have developed the copper nanowire surface fasteners (Cu NSF) as a conductive connector. Since copper has high electrical conductivity and is inexpensive, the Cu NSF can be expected to be practically used as a new surface mounting technique. Moreover, Cu NSF can be connected at room temperature utilizing van der Waals force, so that it is possible to avoid the damage to electronic parts during solder reflow process. However, the adhesion strength of current Cu NSF is still small as compared with traditional solders. The reason is considered that the contact areas of the nanowires were not sufficient because the nanowires collided and collapsed during connecting. In this research, we attempted to increase the contact area of nanowires for improving adhesion strength of Cu NSF. The adhesion strength of the Cu NSFs having nanowires with 100 nm and 400 nm diameter reached the largest value, and increasing with the increase of preload. This investigation showed that the contact areas of nanowires increased and mechanical entanglement of nanowires occurred because of increasing the preload of connecting.</p>

    DOI: 10.1299/jsmemm.2018.OS1306

    CiNii Article

  36. IMPROVEMENT OF ADHESION STRENGTH OF THE COPPER NANOWIRE SURFACE FASTENER BY INVESTIGATING THE DIAMETER RATIO OF NANOWIRES 国際会議

    Kato Motohiro, Toku Yuhki, Morita Yasuyuki, Ju Yang

    IRF2018: PROCEEDINGS OF THE 6TH INTERNATIONAL CONFERENCE ON INTEGRITY-RELIABILITY-FAILURE 

     詳細を見る

    開催年月日: 2018年

    記述言語:英語   会議種別:口頭発表(一般)  

  37. 温度刺激に対する高分子の相転移特性を用いたナノ粒子の薬剤放出制御

    脇本 卓磨, 森田 康之, 徳 悠葵, 巨 陽

    バイオエンジニアリング講演会講演論文集  2018年  一般社団法人 日本機械学会

     詳細を見る

    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmebio.2018.30.1H16

    CiNii Article

  38. 細胞外基質の弾性率が幹細胞分化時の力学場に与える影響

    山本 陵介, 森田 康之, 徳 悠葵, 巨 陽

    バイオエンジニアリング講演会講演論文集  2018年  一般社団法人 日本機械学会

     詳細を見る

    開催年月日: 2018年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmebio.2018.30.1A18

    CiNii Article

  39. Fe<sub>3</sub>O<sub>4</sub>@mSiO<sub>2</sub>-tLyP-1 ナノ粒子を用いた標的指向型 DDS の開発

    森田 康之, 櫻井 涼平, 脇本 卓磨, 徳 悠葵, 巨 陽

    バイオエンジニアリング講演会講演論文集 

     詳細を見る

    開催年月日: 2017年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmebio.2017.29.2B35

    CiNii Article

  40. DVC法を用いたがん細胞スフェロイドの浸潤力学場計測

    中野 優亮, 森田 康之, 山内 崇司, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2017年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>When tumor cells metastasize, invasion of cells plays a major role. In particular, invasion of epithelial tumor cells is induced by performing epithelial-mesenchymal transition (EMT). EMT is a process that have high motility induced by external factors in which epithelial cells are transformed into mesenchymal cells. It is a very important process in invasion. The tumor cells generate forces during cell invasion through a three-dimensional (3D) matrix. Measuring the mechanics field generated in the Extracellular Matrix (ECM) surrounding the cells is an important way to understand the behavior of tumor cells in 3D environment. Therefore, in this study, spheroids, which are the source of the invasion for tumor cells, were embedded in a collagen gel, and the deformations of the collagen gel surrounding the spheroids were measured. Using the DVC method, the matrix deformations around spheroids were measured by tracking the 3D positions of fluorescent beads embedded in the collagen gel. In addition, we added TGF-β1 which facilitates the invasion of tumor cells, and the influence of TGF-β1 on the mechanical property of spheroids was quantitatively evaluated. As a result, it was found that the maximum displacement of spheroids treated with TGF-β1 is larger than that of the one's without TGF-β1 treatment.</p>

    DOI: 10.1299/jsmemm.2017.OS0113

    CiNii Article

  41. Cu<sub>2</sub>O/Cuコアシェルナノワイヤアレイによる太陽光水分解光電極の作製

    笠原 龍太郎, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2017年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In recent days, hydrogen is considered as an alternative energy which could instead of the fossil fuel in the future. A new clean method to manufacture hydrogen gas is called solar water splitting. Cu<sub>2</sub>O is considered as a promising and attractive material for solar driven hydrogen production because the suitable band gap (ca. 2.0 eV) and the low cost. Based on the band gap, it can be calculated the maximum theoretical light-to-hydrogen conversion efficiency is 18% at AM 1.5 spectrum, and the theoretical photocurrent of 14.7 mA/cm<sup>2</sup>. However, the experimental conversion efficiency was much lower than the theoretical one, due to self-corrosion coinciding with water-splitting reaction and that an electron and a hole activated by the sun light irradiation are easily recombined in oxidation film. In this research, Cu<sub>2</sub>O/Cu core-shell Nanowire (NW) has been fabricated on the surface of the photoelectrode by the polycarbonate template method to increase the conversion efficiency by optimizing the NW structure. We have investigated the relationship between NW's structure and photocurrent density, as well as incident photo to current efficiency (IPCE). As a result, we find the optimum conditions of NW's diameter and oxidation time. The visible light responsiveness from IPCE results has also been confirmed.</p>

    DOI: 10.1299/jsmemm.2017.GS0301

    CiNii Article

  42. がん細胞の浸潤力学場に上皮間葉転換が及ぼす影響の 4 次元 DVC 計測

    山内 崇司, 森田 康之, 徳 悠葵, 巨 陽, 河瀬 直樹

    バイオエンジニアリング講演会講演論文集 

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    開催年月日: 2017年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmebio.2017.29.1F42

    CiNii Article

  43. デジタル画像相関法を用いた伸展下における細胞内力学場計測

    梅井 航, 森田 康之, 徳 悠葵, 巨 陽

    年次大会 

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    開催年月日: 2017年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmemecj.2017.J0250205

    CiNii Article

  44. ナノワイヤの直径比最適化によるナノワイヤ面ファスナーの接着強度向上

    加藤 大博, 徳 悠葵, 森田 康之, 巨 陽

    年次大会 

     詳細を見る

    開催年月日: 2017年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Lead-free solder has been used for surface mounting of electronic devices in consideration of the environment. However, there is a concern that the electronic parts may be damaged by heating during bonding because the lead-free solder has a high melting point. Therefore, development of a new bonding technique without heating is required. There are many studies on nanowires because of their unique characteristics which are different from bulk materials. In this paper, we fabricated Cu nanowire surface fasteners and investigated the improvement of strength by changing the diameter ratio of nanowires. Cr and Au films were formed as electrodes on glass substrates by sputtering. According to the template method, the polycarbonate template was fixed on one electrode to fabricate Cu nanowires by electrodepositing in the CuSO<sub>4</sub>·5H<sub>2</sub>O solution. After removing the template by etching with dichloromethane, the Cu nanowire surface fastener was fabricated. By applying a preload, the Cu nanowire surface fasteners were connected. Thereafter, the adhesion strength of the Cu nanowire surface fastener was evaluated by a tensile test. The highest bonding strength was found to be 162.6 N/cm<sup>2</sup> while the combination of the nanowire array with the diameter ratio of 1:4. Nanowires intertangling with each other was assumed to be an additional effect on the van der Waals force between nanowires.</p>

    DOI: 10.1299/jsmemecj.2017.J0330303

    CiNii Article

  45. バッファ層がZnO薄膜の圧電特性に及ぼす影響

    河合 航大, 徳 悠葵, 森田 康之, 巨 陽

    年次大会 

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    開催年月日: 2017年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Three-dimensional manipulation is necessary to make assembly operations during fabricating micro/nano-scale devices. However, it is difficult to release the objects at nanoscale due to the adhesion force between object and manipulator. Some researchers have developed manipulation devices which can reduce the adhesion force by utilizing the inertial force generated by vibrating the microcantilever with a bulk piezoelectric material placed near the base of it. However, there is still a problem of size, and it has not been applied to a narrow space such as a scanning electron microscope chamber. In order to further downsize the manipulator, simplification of the manipulation devices by using thin film piezoelectric materials instead of bulk piezoelectric ones and directly attaching to the microcantilever is effective. In this case, it is important to select the buffer layer which is originally used for relaxing the lattice mismatch to enhance the piezoelectricity of the thin film. In this study, the influence of buffer layer on piezoelectric properties of ZnO thin film was investigated. The deflection was measured when AC voltage was applied to the cantilever fabricated with ZnO thin film and the cross section of the cantilever were observed. As a result, using the Cr buffer layer rather than using Al buffer layer, the average of the cantilever tip displacement at each applied voltage was approximately 6 times larger and the piezoelectricity of the ZnO thin film was improved.</p>

    DOI: 10.1299/jsmemecj.2017.J2220205

    CiNii Article

  46. マイクロ波原子間力顕微鏡の力変化による局所誘電率の定量評価

    トン 博, 趙 岷吉, 徳 悠葵, 森田 康之, 巨 陽

    計算力学講演会講演論文集 

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    開催年月日: 2017年

    記述言語:日本語   会議種別:口頭発表(一般)  

    Microwave atomic force microscopy (M-AFM) is designed to realize the non-contact measurement of topography and electrical property at nanoscale simultaneously. For the evaluation of dielectric materials, since the detected reflected signal depends strongly on the probe-sample distance, in non-contact mode the quantitative evaluation regardless of the effect of distance is difficult. In this study, the effect of microwave on the force between the probe and dielectric materials was investigated. A theoretic model based on the reflection of electromagnetic wave was established to describe the distance dependence of microwave intensity between sample and probe. The relationship between the force gradient and sample permittivity was obtained and the permittivity of Al<sub>2</sub>O<sub>3</sub>, Ge, and ZrO<sub>2</sub> was evaluated using this theoretical model.

    DOI: 10.1299/jsmecmd.2017.30.340

    CiNii Article

  47. 伸縮刺激を用いた間葉系幹細胞の腱細胞分化に対する繰り返し周波数の影響

    平野 勇勝, 森田 康之, 徳 悠葵, 巨 陽

    バイオフロンティア講演会講演論文集 

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    開催年月日: 2017年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmebiofro.2017.28.1A24

    CiNii Article

  48. 機能性ナノワイヤ面ファスナーの接着強度および熱伝導性の向上

    野々村 陸, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス 

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    開催年月日: 2017年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Solder has been used for the conventional bonding technology in electronic assembly for a long time. However, the traditional reflow soldering technique is characterized by high heating temperatures. Moreover, due to the progress of power devices, the working temperature in the electrical packages is increased. Therefore, we have proposed nanowire surface fastener (NSF) based on Cu nanowire arrays by which cold bonding for electrical packaging can be realized. Since copper is a high thermal conductive material, a satisfactory heat transfer characteristic is expected. In this paper, we investigated the improvements of the strength and thermal properties by changing the connecting load. The template method was used for fabricating Cu nanowire arrays, and the bonding strength of Cu NSF was evaluated by a tensile test. The highest bonding strength (205.06 N/cm<sup>2</sup>) was recorded when two nanowire arrays were connected by the connecting load of 125 N. Simultaneously, we measured the electrical resistance of Cu NSF by a four-terminal method. The electrical resistance showed the opposite behaviour to the bonding strength. Specifically, the larger connecting load we applied, the lower electrical resistance it showed. In metallic materials, since free electrons are carriers of the electric current and heat transfer, the electric conductivity and the thermal conductivity are closely related. Therefore, improvements of the electric and thermal conductivity are expected when electrical resistance decreases.</p>

    DOI: 10.1299/jsmemm.2017.OS1407

    CiNii Article

  49. 薄膜残留応力を利用した金属被覆ナノベルトのゼンマイ形成に関する研究

    戸川 陽介, 徳 悠葵, 森田 康之, 巨 陽

    年次大会 

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    開催年月日: 2017年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In recent years, various nanomaterials have been studied and a wide variety of applications have been attracted as the outcome of nanotechnology development. As research progresses, it can be expected that nanomachine technology will be a future subject. In this case a nanoscale power source is necessary, but it has not yet been put to practical use. Therefore, we propose a nanoscroll as a new nanoscale energy storage device. The advantage of nanoscroll is that they can storage energy with high efficiency and high density, and can be used as actuators by a simple procedure. We have built up a new material processing method for bending deformation of nanomaterials. In previous study, we succeeded in forming nanocoils by applying this method to nanowires. In this study, we tried to create nanoscroll by applying it to nanobelt. We achieved creating the shape with different curvatures at the tip and root of the nanobelt by nonuniformly sputtering in longitudinal direction. The deformation in the pitch direction was also suppressed.</p>

    DOI: 10.1299/jsmemecj.2017.J2220204

    CiNii Article

  50. Effect of pulsed electric current on the mechanical properties of titanium alloy 国際会議

    Jung J.

    ICF 2017 - 14th International Conference on Fracture 

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    開催年月日: 2017年

    記述言語:英語   会議種別:口頭発表(一般)  

    Scopus

  51. カーボンナノチューブシートを用いた水素センサーの開発

    厳 可逸,徳 悠葵,森田 康之,巨 陽

    日本機械学会 第24回機械材料・材料加工技術講演会(M&P2016) 

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    開催年月日: 2016年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:早稲田大学   国名:日本国  

  52. ナノワイヤ面ファスナーのための低細孔密度ポーラスアルミナテンプレートの開発

    宋 揚,徳 悠葵,森田 康之,巨 陽

    日本機械学会 第24回機械材料・材料加工技術講演会(M&P2016) 

     詳細を見る

    開催年月日: 2016年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:早稲田大学   国名:日本国  

  53. DVC 法を用いた幹細胞分化時における細胞外基質の 3 次元力学場計測

    山本 陵介,森田 康之,山内 崇司,徳 悠葵,巨 陽

    日本機械学会 M&M2016材料力学カンファレンス 

     詳細を見る

    開催年月日: 2016年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学   国名:日本国  

  54. Cu2O/Cu コアシェルナノ構造太陽電池のナノワイヤ密度が変換効率に与える影響

    松尾 亮佑,巨 陽,森田 康之,徳 悠葵

    日本機械学会 M&M2016材料力学カンファレンス 

     詳細を見る

    開催年月日: 2016年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学   国名:日本国  

  55. ストレスマイグレーションを利用した Al ナノワイヤの成長に及ぼす Al 薄膜構造の影響

    鈴木 崇真,徳 悠葵,森田 康之,巨 陽

    日本機械学会 M&M2016材料力学カンファレンス 

     詳細を見る

    開催年月日: 2016年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学   国名:日本国  

  56. マイクロ波が誘起する探針―試料間原子間力による局所誘電率評価

    チョウ ミンキ,徳 悠葵,森田 康之,巨 陽

    日本機械学会 M&M2016材料力学カンファレンス 

     詳細を見る

    開催年月日: 2016年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学   国名:日本国  

  57. マイクロ波原子間力顕微鏡を用いた局所導電率測定に及ぼす試料表面形状の影響

    波多野 貴大,徳 悠葵,森田 康之,巨 陽

    日本機械学会 M&M2016材料力学カンファレンス 

     詳細を見る

    開催年月日: 2016年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学   国名:日本国  

  58. マイクロ波を用いた熱可塑性炭素繊維強化プラスチックの繊維含有率測定技術の開発

    田所 昴,巨 陽,森田 康之,徳 悠葵

    日本機械学会 M&M2016材料力学カンファレンス 

     詳細を見る

    開催年月日: 2016年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学   国名:日本国  

  59. 熱疲労を受けるナノワイヤ面ファスナーの接続強度および電気的特性の評価

    徳 悠葵,野田 修二,森田 康之,巨 陽

    日本機械学会 第29回計算力学講演会 CMD2016 

     詳細を見る

    開催年月日: 2016年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:名古屋大学   国名:日本国  

  60. 薄膜残留応力を利用した被覆 Al ナノワイヤの自己変形

    上田 祐志,徳 悠葵,森田 康之,巨 陽

    日本機械学会 2016年度年次大会講演会 

     詳細を見る

    開催年月日: 2016年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:九州大学   国名:日本国  

  61. カーボンナノチューブ複合材料の強度向上に関 する実験的検討

    笠原龍太郎,徳 悠葵,森田 康之,巨 陽

    日本機械学会 2016年度年次大会講演会 

     詳細を見る

    開催年月日: 2016年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:九州大学   国名:日本国  

  62. 同軸構造を有するマイクロ波原子間力顕微鏡プローブの作製および評価

    平林 貴大,徳 悠葵,森田 康之,巨 陽

    日本機械学会 2016年度年次大会講演会 

     詳細を見る

    開催年月日: 2016年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:九州大学   国名:日本国  

  63. 機械的伸縮刺激による腱細胞分化に関する1細胞計測

    山下 貴大,森田 康之,徳 悠葵,巨 陽

    日本機械学会東海支部第65期総会・講演会 

     詳細を見る

    開催年月日: 2016年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  64. マイクロビーズを利用したナノ多孔質膜の細孔密度の制御

    川島 大輝,巨 陽,森田 康之,徳 悠葵

    日本機械学会東海学生会第47回学生員卒業研究発表講演会 

     詳細を見る

    開催年月日: 2016年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  65. 高密度電流印加がチタン合金の材料強度におよぼす影響

    稲留 義朗,徳 悠葵,森田 康之,巨 陽

    日本機械学会東海学生会第47回学生員卒業研究発表講演会 

     詳細を見る

    開催年月日: 2016年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  66. 間葉系幹細胞の腱組織構築に対するひずみ依存性

    東浦 功治, 森田 康之, 佐藤 俊博, 徳 悠葵, 巨 陽

    バイオフロンティア講演会講演論文集 

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmebiofro.2016.27.B215

    CiNii Article

  67. Cu<sub>2</sub>O/Cuコアシェルナノ構造太陽電池のナノワイヤ密度が変換効率に与える影響

    松尾 亮佑, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Currently, solar cells aremainlymade fromSi.However, due to the high cost and the limited resources of Si, new materials for solar cells are still needed. It has been proved that Cu<sub>2</sub>O solar cells have a high theoretical energy conversion efficiency with a very low cost. However, the actual efficiency of Cu<sub>2</sub>O solar battery is much lower than theoretical value. In this research, Cu<sub>2</sub>O/Cu core-shell NWs are fabricated on the surface of the solar cell by the AAO template method to increase light receiving area. As a result, we succeed in fabricating Cu<sub>2</sub>O/Cu core-shell NWs. The surface area of the solar cell is increased to about 151 times, which improve the solar energy conversion efficiency. And, we also find that the density of NWarrays effects the solar energy conversion efficiency.</p>

    DOI: 10.1299/jsmemm.2016.GS-40

    CiNii Article

  68. 312 機械的伸縮刺激による腱細胞分化に関する1細胞計測(GS3-1 人体の力学挙動・生体計測)

    山下 貴大, 森田 康之, 徳 悠葵, 巨 陽

    東海支部総会講演会講演論文集 

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmetokai.2016.65._312-1_

    CiNii Article

  69. 312 機械的伸縮刺激による腱細胞分化に関する1細胞計測(GS3-1 人体の力学挙動・生体計測)

    山下 貴大, 森田 康之, 徳 悠葵, 巨 陽

    一般社団法人 日本機械学会 

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    CiNii Article

  70. カーボンナノチューブシートを用いた水素センサーの開発

    厳 可逸, 徳 悠葵, 森田 康之, 巨 陽

    機械材料・材料加工技術講演会講演論文集  2016年  一般社団法人 日本機械学会

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    <p>Due to their high specific surface area and measurable change in conductance according to the chemical environment changes, carbon nanotubes (CNTs) have been proved to be an ideal material for next generation of gas sensor. However, before CNTs-based sensor can become a candidate for commercial implementation, there are still challenges including mass production of sensor arrays and improvement of sensor reproducibility. In this research, a high sensitivity CNT sheet-based gas sensor was fabricated, which can push forward the commercialization of CNT-based sensor. By controlling the reaction conditions during chemical vapor deposition (CVD) process, a spinnable CNT array was synthesized reproducibly. The CNT sheets were drawn from a sidewall of spinnable CNT array. CNT sheets were directly fixed onto Au electrodes and were heated up to 300°C for 2 h to oxidize amorphous carbon. Gas detection toward hydrogen gas was operated in a quartz tube chamber. With the change of gas concentration, the change in sensor resistances as response and recovery behavior was measured using a programmable electrometer. A sensitivity of 5% for 4% H<sub>2</sub> was achieved at 200°C for pure CNT sheet and a sensitivity of 2.5% towards H<sub>2</sub> gas at room temperature was achieved by Pd functionalization.</p>

    CiNii Article

  71. 同軸構造を有するマイクロ波原子間力顕微鏡プローブの作製および評価

    平林 貴大, 徳 悠葵, 森田 康之, 巨 陽

    年次大会  2016年  一般社団法人 日本機械学会

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    <p>With the development of nanotechnology in recent years, many researchers have focused on the fabrication of nanomaterials and nanostructures. To apply these nanomaterials and nanostructures into electronic devices, there are great needs of quantitative measurement of electrical properties of them. To satisfy these demands, we have developed the measurement instrument named microwave atomic force microscopy (M-AFM). Special probes with two unique abilities which are transmitting and radiating the microwaves were used for M-AFM. To improve these abilities, the tip of the probe was changed from slit structure to coaxial one. In this paper the new process of fabrication of coaxial structured probes were described, and the results of M-AFM measurement on the Au/GaAs sample using former slit probe and developed coaxial probe were presented. M-AFM measurement using coaxial probe obtained the clearer image of microwave responses. Results of measurements indicated coaxial probes have higher resolution in electrical properties measurement.</p>

    CiNii Article

  72. 薄膜残留応力を利用した被覆Alナノワイヤの自己変形

    上田 祐志, 徳 悠葵, 森田 康之, 巨 陽

    年次大会  2016年  一般社団法人 日本機械学会

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    <p>Micro/nano coils have been expected to be utilized in various applications as small inductors. Various methods have been proposed for fabricating them. Most of these methods were based on self-assembly technique such as thermal sublimation and chemical vapor deposition. In our previous study, we proposed an alternative method based on a mechanical process, where a straight nanowire is bent by depositing a thin film with a circumferentially nonuniform thickness on the nanowire. The bending is due to the misfit strain of the coated film. In order to enhance the bending, we also adopted a heat treatment that induces a creep flow only in the nanowire and thereby released the constraint of the nanowire on elastic bending due to film strain. However, the shape control of micro/nano coils such as coil pitch and direction of helical deformation was still not succeeded. In present study, we investigated the effects of film thickness and nanowire position on the coil formation during coil formation in the sputtering chamber. We achieved the shape control of micro/nano coils by varying the film thickness and nanowire position.</p>

    CiNii Article

  73. カーボンナノチューブ複合材料の強度向上に関する実験的検討

    笠原 龍太郎, 徳 悠葵, 森田 康之, 巨 陽

    年次大会  2016年  一般社団法人 日本機械学会

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    <p>Carbon nanotube (CNT) composite materials are expected to be utilized in the field of aerospace and automobile industry due to their excellent mechanical property and relatively light weight. However, the experimental material strength measured from tensile test was much lower than the theoretical one calculated by simulation. In order to clarify the mechanism how CNT in the resin improves the material strength and increase experimental value, tensile tests and observation of fracture surface have been conducted in this research. Flaked composite material specimens with different local CNT content rates were prepared for tensile test. As a result of tensile test, we got material strength of flacked composite material specimens, which was approximately 2.5 times higher than that of only resin. By microscopic observation, we confirmed CNT pulled out from base material on fracture surface. In this research, we achieved that a higher local content rate of CNT leads to a higher experimental strength.</p>

    CiNii Article

  74. 熱疲労を受けるナノワイヤ面ファスナーの接続強度および電気的特性の評価

    徳 悠葵, 野田 修二, 森田 康之, 巨 陽

    計算力学講演会講演論文集  2016年  一般社団法人 日本機械学会

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    CiNii Article

  75. ストレスマイグレーションを利用したAlナノワイヤの成長に及ぼすAl薄膜構造の影響

    鈴木 崇真, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2016年  一般社団法人 日本機械学会

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    <p>Nanowire (NW) is one-dimensional nanostructure with the diameter in nanoscale. Currently, we can fabricate NWs made from metal, metal oxide and semiconductor which could be utilized in various applications. In our previous study, we investigated a new fabrication method of Al NWs with high growth density by stress migration. It is generally known that Al is high conductivity and inexpensive material, therefore this method for mass production of Al NWs has a big advantage. However, the mechanism of fabrication has not been clear. In this study, we investigated the effect of surface roughness and etching depth induced by focused ion beam etching on the growth density of Al NWs. As a result, we found that etching depth strongly affects the growth density of Al NWs.</p>

    CiNii Article

  76. マイクロ波が誘起する探針―試料間原子間力による局所誘電率評価

    趙 珉吉, 佟 博, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2016年  一般社団法人 日本機械学会

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    <p>With the development of nanotechnology, different types of scanning probe microscopy (SPM) have been developed to satisfy the requirement of nanotechnology. The microwave detection system is combined on the atomic force microscopy (AFM) to evaluate the electrical properties of the materials simultaneously. It is found that when microwave is applied through the probe, the microwave has interaction with the material. In this paper, the mechanism of the interaction between the microwave and material is investigated. We evaluated the probes by the microwave atomic force microscope (M-AFM) and verified our theoretical work. The result implies that the interatomic force between the tip and sample can be utilized to evaluate the permittivity of semiconductor and insulator materials.</p>

    CiNii Article

  77. マイクロ波原子間力顕微鏡を用いた局所導電率測定に及ぼす試料表面形状の影響

    波多野 貴大, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2016年  一般社団法人 日本機械学会

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    <p>With the development of nanotechnology in recent years, many researchers have focused on the development of nanomaterials and nanostructures. To apply these nanomaterials and nanostructures into nanodevices, the measurement technology for measuring electrical properties at high spatial resolution has been requested. Therefore, our group has developed Microwave Atomic Force Microscopy (M-AFM) in order to assess electrical conductivity in a minute area. This paper describes influence of material surface on the measurement of local electrical conductivity using M-AFM. Results of this experiment indicate actually that M-AFM can measure electrical conductivity in a local area accurately without being affected by the material surface.</p>

    CiNii Article

  78. マイクロ波を用いた熱可塑性炭素繊維強化プラスチックの繊維含有率測定技術の開発

    田所 昴, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2016年  一般社団法人 日本機械学会

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    <p>Carbon fiber reinforced thermoplastic (CFRTP) has high specific strength, rigidity and corrosion proof. CFRTP is used for structural members such as aircrafts, automobiles, blades of electricgenerating windmills and sporting goods. Because the mechanical strength of CFRTP depends on the volume fraction, the evaluation of the volume fraction of CFRTP is very important in the guarantee of quality. Thus, the nondestructive inspection method to detect the volume fraction in CFRTP is required. In this paper, we measured the conductivity of CFRTP from the reflection wave of the microwave. Using a theory model, the volume fraction was evaluated from the conductivity. As a result, the potential of microwave inspection to evaluate the volume fraction in CFRTP was presented.</p>

    CiNii Article

  79. ナノワイヤ面ファスナーのための低細孔密度ポーラスアルミナテンプレートの開発

    宋 揚, 徳 悠葵, 森田 康之, 巨 陽

    機械材料・材料加工技術講演会講演論文集  2016年  一般社団法人 日本機械学会

     詳細を見る

    開催年月日: 2016年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    CiNii Article

  80. ストレスマイグレーションによる単結晶 Al ナノワイヤの高密度生成

    鈴木 崇真,徳 悠葵,森田 康之,巨 陽

    日本機械学会 M&M2015材料力学カンファレンス 

     詳細を見る

    開催年月日: 2015年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  81. マイクロ波を利用した熱可塑性炭素繊維強化プラスチックの繊維含有率の定量評価

    田所昴,徳悠葵,森田康之,巨陽

    日本機械学会 M&M2015材料力学カンファレンス 

     詳細を見る

    開催年月日: 2015年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  82. コアシェルナノワイヤを用いた亜酸化銅太陽電池の作製および評価

    松尾 亮佑,徳 悠葵,森田 康之,巨 陽

    日本機械学会 M&M2015材料力学カンファレンス 

     詳細を見る

    開催年月日: 2015年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  83. GS0705-431 コアシェルナノワイヤを用いた亜酸化銅太陽電池の作製および評価

    松尾 亮佑, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2015年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    Currently, the solar cells are mainly made of silicon. However, due to the high cost and shortage of silicon, new materials for solar cells are still needed. It has been proved that Cu_2O solar cells have a high theoretical energy conversion efficiency with a very low cost. However, the actual efficiency of Cu_2O solar cell is much lower than theoretical one. In this research, Cu_2O/Cu core-shell nanowires are fabricated on the surface of the solar cell by the template method to increase light receiving area. Then, elemental analysis for core-shell nanowires is carried out by Electron Energy-Loss Spectroscopy. As a result, we succeed in fabricating Cu_2O/Cu core-shell nanowires. The area of the solar cells is increased to about 220 times, which is convinced to improve the solar energy conversion efficiency.

    CiNii Article

  84. ナノ加工プロセスによるナノワイヤ群のフック形成に関する研究

    徳 悠葵,草間 美香,巨 陽

    日本機械学会機械材料・材料加工部門 第23回機械材料・材料加工技術講演会 

     詳細を見る

    開催年月日: 2015年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  85. The shape control and performance evaluation of nanowire surface fastener 国際会議

    Mika KUSAMA, Yuhki TOKU, Yang JU

    The international conference on advanced technology in experimental mechanics 2015 and the 14th Asian conference on experimental mechanics  

     詳細を見る

    開催年月日: 2015年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  86. マイクロ 波原子間力顕微鏡の探針先端における原子間力の評価

    一二三 和馬, 徳 悠葵, 巨 陽

    日本機械学会  2015年度年次大会 

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    開催年月日: 2015年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  87. 応力誘導法による三次元ナノ構造体の作製

    若林 信宏, 徳 悠葵,巨 陽

    日本機械学会  2015年度年次大会 

     詳細を見る

    開催年月日: 2015年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  88. ストレスマイグレーションによる超高品質 Alナノワイヤの創製と電気的特性の評価

    柴田 貴俊,小島 直樹,徳 悠葵,巨 陽

    日本機械学会  2015年度年次大会 

     詳細を見る

    開催年月日: 2015年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  89. コアシェルナノ構造を利用した原子拡散によるナノウィスカー生成に関する研究

    徳 悠葵,村岡 幹夫,巨 陽

    日本機械学会 材料力学部門 若手シンポジウム2015 

     詳細を見る

    開催年月日: 2015年8月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  90. OS14-6 The Shape Control and Performance Evaluation of Nanowire Surface Fastener(Semiconductor Devices and Electronic Packaging 2,OS14 Electronic and photonic packages,APPLICATIONS) 国際会議

    Kusama Mika, Toku Yuhki, Ju Yang

    Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 

     詳細を見る

    開催年月日: 2015年

    記述言語:英語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmeatem.2015.14.212

    CiNii Article

  91. J2220204 応力誘導法による3次元ナノ構造体の作製

    若林 信宏, 徳 悠葵, 巨 陽

    年次大会 

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(一般)  

    In this study. we suggested simple and easy fabrication technique of flowe-like nanomaterials called Nano Flower (NF) by stress-induced method. From the observation of NFs grown on substrates which have different surface conditions, growth of NFs is probably related to residual stress of surface of substrates. EDS analysis results show that NFs grow up by taking in atmospheric carbon dioxide. NFs are expected as application to carbon dioxide capture and storage.

    DOI: 10.1299/jsmemecj.2015._J2220204-

    CiNii Article

  92. J0610105 ストレスマイグレーションによる超高晶質Alナノワイヤの創製と電気的特性の評価

    柴田 貴俊, 徳 悠葵, 巨 陽, 小島 直樹

    年次大会 

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(一般)  

    We describe the result of the electrical conductivity measurement of single crystalline aluminum nanowires. These nanowires are fabricated by simply heating the Al samples in air. The growth mechanism is stress-induced migration. Four electrodes were patterned on nanowires by the photolithographic technique and we obtained the resistivity of nanowires by four-terminal measurement. The relationship between electrical conductivity and diameter was examined experimentally.

    DOI: 10.1299/jsmemecj.2015._J0610105-

    CiNii Article

  93. J0610104 マイクロ波原子間力顕微鏡の探針先端における原子間力の評価に関する研究

    一二三 和馬, 徳 悠葵, 巨 陽

    年次大会 

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(一般)  

    With the development of nanotechnology in recent years, many researchers have focused on the development of nanomaterials and nanostructures such as nanowires. To apply these nanomaterials and nanostructures into nanodevices, there are great needs of the quantitative measurement of electrical properties of materials in an infinitesimal area. Recently, it has been reported that the microwave gives an effect to an interatomic force in local area among materials. Therefore, it is thought that an identification of materials and an evaluation of electrical characteristics become possible by clarifying the relation between microwave and interatomic force. Therefore, we investigated interatomic force under the tip of probe by focusing on the force-distance curve measurement using microwave atomic force microscopy (M-AFM) as the first step. This paper describes the method and the results of the force-distance curve measurement on the sample of Au, Si, and glass. Results of this experiment indicate actually that the effect of microwave is large in material which has high electric conductivity.

    DOI: 10.1299/jsmemecj.2015._J0610104-

    CiNii Article

  94. GS0706-432 ストレスマイグレーションによる単結晶Alナノワイヤの高密度生成

    鈴木 崇真, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(一般)  

    Nanowires have been expected to be utilized in various applications. Recently, many researchers have reported about single crystal or polycrystalline nanowires where the single crystal nanowires are shown to have a higher conductivity compared to the polycrystalline ones. In our previous study, we investigated the fabrication process of single crystal nanowires by stress migration. However, because the mechanism of fabrication was not clear, the generation density of single crystal nanowires was low for this method. In this study, we suggested a new method to increase the generation density of single crystal nanowires. An etching process was added to the previous fabrication method and the conditions of the substrate surface were changed. By doing this, the stress generated around the concentrated Al atoms was larger than the threshold stress needed to fabricate the nanowires. As a result of the added etching process, we achieved a nanowire generation density 100 times that of the conventional fabrication method.

    DOI: 10.1299/jsmemm.2015._GS0706-43

    CiNii Article

  95. F041003 機能性ナノワイヤ面ファスナーの創製 招待有り

    巨 陽, 徳 悠葵

    年次大会 

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    Mass production of surface mount devices (SMDs) relies heavily on reflow soldering and has become the cornerstone of today's electronic industry. However, the traditional reflow soldering technique is characterized by high heating temperatures, toxic solder materials and low recycling rate of SMDs. Here, we introduce a new patterned structure of nanowire arrays named a surface fastener through which cold bonding for surface mount technology can be realized. The mechanical bonding enables normal and shear bonding strengths of more than 5 N/cm^2. Simultaneously, the parasitic resistance of a pair of surface fasteners is only approximately 2Ω. The present technique can be performed at room temperature, thereby improving the process compatibility and reliability of SMDs. Surface fasteners based on high melting point metallic nanowires are temperature-resistant for many critical applications. In addition, bonding without solder material is positive for the recycling of rare metals in SMDs.

    DOI: 10.1299/jsmemecj.2015._F041003-1

    CiNii Article

  96. 722 ナノ加工プロセスによるナノワイヤ群のフック形成に関する研究

    徳 悠葵, 草間 美香, 巨 陽

    機械材料・材料加工技術講演会講演論文集 

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmemp.2015.23._722-1_

    CiNii Article

  97. OS0409-433 マイクロ波を利用した熱可塑性炭素繊維強化プラスチックの繊維含有率の定量評価

    田所 昴, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(一般)  

    Carbon fiber reinforced thermoplastic (CFRTP) has high specific strength, rigidity and corrosion proof CFRTP is used for structural members such as aircrafts, automobiles, blades of electric-generating windmills and sporting goods. Because the mechanical strength of CFRTP depends on the volume fraction, the evaluation of the volume fraction of CFRTP is very important in quality control and a guarantee of quality. Thus, the nondestructive inspection method to detect the volume fraction in CFRTP is required. In this paper, we measured the conductivity of CFRTP from the reply of the reflection wave of the microwave. And using a theory model, the volume fraction was evaluated from the conductivity. As the result, the potential of microwave inspection to evaluate the volume fraction in CFRTP was presented.

    DOI: 10.1299/jsmemm.2015._OS0409-43

    CiNii Article

  98. GS0706-432 ストレスマイグレーションによる単結晶Alナノワイヤの高密度生成

    鈴木 崇真, 徳 悠葵, 森田 康之, 巨 陽

    一般社団法人 日本機械学会 

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    Nanowires have been expected to be utilized in various applications. Recently, many researchers have reported about single crystal or polycrystalline nanowires where the single crystal nanowires are shown to have a higher conductivity compared to the polycrystalline ones. In our previous study, we investigated the fabrication process of single crystal nanowires by stress migration. However, because the mechanism of fabrication was not clear, the generation density of single crystal nanowires was low for this method. In this study, we suggested a new method to increase the generation density of single crystal nanowires. An etching process was added to the previous fabrication method and the conditions of the substrate surface were changed. By doing this, the stress generated around the concentrated Al atoms was larger than the threshold stress needed to fabricate the nanowires. As a result of the added etching process, we achieved a nanowire generation density 100 times that of the conventional fabrication method.

    CiNii Article

  99. F041003 機能性ナノワイヤ面ファスナーの創製

    巨 陽, 徳 悠葵

    一般社団法人 日本機械学会 

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    Mass production of surface mount devices (SMDs) relies heavily on reflow soldering and has become the cornerstone of today's electronic industry. However, the traditional reflow soldering technique is characterized by high heating temperatures, toxic solder materials and low recycling rate of SMDs. Here, we introduce a new patterned structure of nanowire arrays named a surface fastener through which cold bonding for surface mount technology can be realized. The mechanical bonding enables normal and shear bonding strengths of more than 5 N/cm^2. Simultaneously, the parasitic resistance of a pair of surface fasteners is only approximately 2Ω. The present technique can be performed at room temperature, thereby improving the process compatibility and reliability of SMDs. Surface fasteners based on high melting point metallic nanowires are temperature-resistant for many critical applications. In addition, bonding without solder material is positive for the recycling of rare metals in SMDs.

    CiNii Article

  100. J0610104 マイクロ波原子間力顕微鏡の探針先端における原子間力の評価に関する研究

    一二三 和馬, 徳 悠葵, 巨 陽

    一般社団法人 日本機械学会 

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    With the development of nanotechnology in recent years, many researchers have focused on the development of nanomaterials and nanostructures such as nanowires. To apply these nanomaterials and nanostructures into nanodevices, there are great needs of the quantitative measurement of electrical properties of materials in an infinitesimal area. Recently, it has been reported that the microwave gives an effect to an interatomic force in local area among materials. Therefore, it is thought that an identification of materials and an evaluation of electrical characteristics become possible by clarifying the relation between microwave and interatomic force. Therefore, we investigated interatomic force under the tip of probe by focusing on the force-distance curve measurement using microwave atomic force microscopy (M-AFM) as the first step. This paper describes the method and the results of the force-distance curve measurement on the sample of Au, Si, and glass. Results of this experiment indicate actually that the effect of microwave is large in material which has high electric conductivity.

    CiNii Article

  101. J0610105 ストレスマイグレーションによる超高晶質Alナノワイヤの創製と電気的特性の評価

    柴田 貴俊, 徳 悠葵, 巨 陽, 小島 直樹

    一般社団法人 日本機械学会 

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    We describe the result of the electrical conductivity measurement of single crystalline aluminum nanowires. These nanowires are fabricated by simply heating the Al samples in air. The growth mechanism is stress-induced migration. Four electrodes were patterned on nanowires by the photolithographic technique and we obtained the resistivity of nanowires by four-terminal measurement. The relationship between electrical conductivity and diameter was examined experimentally.

    CiNii Article

  102. J2220204 応力誘導法による3次元ナノ構造体の作製

    若林 信宏, 徳 悠葵, 巨 陽

    一般社団法人 日本機械学会 

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    In this study. we suggested simple and easy fabrication technique of flowe-like nanomaterials called Nano Flower (NF) by stress-induced method. From the observation of NFs grown on substrates which have different surface conditions, growth of NFs is probably related to residual stress of surface of substrates. EDS analysis results show that NFs grow up by taking in atmospheric carbon dioxide. NFs are expected as application to carbon dioxide capture and storage.

    CiNii Article

  103. 722 ナノ加工プロセスによるナノワイヤ群のフック形成に関する研究

    徳 悠葵, 草間 美香, 巨 陽

    一般社団法人 日本機械学会 

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    CiNii Article

  104. OS0409-433 マイクロ波を利用した熱可塑性炭素繊維強化プラスチックの繊維含有率の定量評価

    田所 昴, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2015年  一般社団法人 日本機械学会

     詳細を見る

    開催年月日: 2015年

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    Carbon fiber reinforced thermoplastic (CFRTP) has high specific strength, rigidity and corrosion proof CFRTP is used for structural members such as aircrafts, automobiles, blades of electric-generating windmills and sporting goods. Because the mechanical strength of CFRTP depends on the volume fraction, the evaluation of the volume fraction of CFRTP is very important in quality control and a guarantee of quality. Thus, the nondestructive inspection method to detect the volume fraction in CFRTP is required. In this paper, we measured the conductivity of CFRTP from the reply of the reflection wave of the microwave. And using a theory model, the volume fraction was evaluated from the conductivity. As the result, the potential of microwave inspection to evaluate the volume fraction in CFRTP was presented.

    CiNii Article

  105. 金属被覆により生じるナノワイヤの曲げ変形に関する理論解析

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会 

     詳細を見る

    開催年月日: 2014年7月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  106. OS1507 金属被覆により生じるナノワイヤの曲げ変形に関する理論解析

    徳 悠葵, 村岡 幹夫

    M&M材料力学カンファレンス 

     詳細を見る

    開催年月日: 2014年

    記述言語:日本語   会議種別:口頭発表(一般)  

    In this study, we discussed about the effect of film thickness on bending deformation of coated nanowire (NW). The three dimensional theoretical model for analyzing the effect was proposed in this paper. The dependence of the misfit strain on the film thickness was introduced in the model. We concluded that bending direction of the NW varied with increasing the coating film thickness. This result arises from the dependence of the misfit strain on the film thickness and the nonuniform film thickness along the circumference of the NW.

    DOI: 10.1299/jsmemm.2014._OS1507-1_

    CiNii Article

  107. 金属被覆ナノワイヤの通電による形態変化の観察

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会 

     詳細を見る

    開催年月日: 2013年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  108. 211 コア流動法によるナノコイル形成に関する理論的検討(材料力学III)

    工藤 隆祐, 徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会 

     詳細を見る

    開催年月日: 2013年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    CiNii Article

  109. コア流動法により作製した金属被覆マイクロコイルの発生磁場評価

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会 

     詳細を見る

    開催年月日: 2013年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  110. 511 金属被覆ナノワイヤの通電による形態変化の観察

    徳 悠葵, 村岡 幹夫

    機械材料・材料加工技術講演会講演論文集 

     詳細を見る

    開催年月日: 2013年

    記述言語:日本語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmemp.2013.21._511-1_

    CiNii Article

  111. 330 コア還元による薄膜の残留応力解放を利用した金属被覆ナノワイヤの微小コイル形成

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会 

     詳細を見る

    開催年月日: 2012年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    CiNii Article

  112. 振動慣性力を利用したナノワイヤの付着力制御

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会 

     詳細を見る

    開催年月日: 2012年8月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  113. Manipulation of Nanowires by Chopsticks 国際会議

    Kohtaro KOBAYASHI, Yuhki TOKU, Mikio MURAOKA

    International Conference on Advanced Technology in Experimental Mechanics 2011 

     詳細を見る

    開催年月日: 2011年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  114. Effect of Film Thickness on Helical Formation of Coated Nanowires in an Enhanced-Bending Technique 国際会議

    Yuhki TOKU, Mikio MURAOKA

    JSME/ASME 2011 International conference on materials & processing 

     詳細を見る

    開催年月日: 2011年6月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:アメリカ合衆国  

  115. OS06-2-4 Manipulation of Nanowires by Chopsticks 国際会議

    Kobayashi Kohtaro, Toku Yuhki, Muraoka Mikio

    Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 

     詳細を見る

    開催年月日: 2011年

    記述言語:英語   会議種別:口頭発表(一般)  

    DOI: 10.1299/jsmeatem.2011.10._OS06-2-4-

    CiNii Article

  116. Enhanced Bending of Coated Nanowires Using Viscous Flow of Core Material: Production of Nanoinductance 国際会議

    Yuhki TOKU, Mikio MURAOKA

    12th International Conference on Electronics Materials and Packaging 

     詳細を見る

    開催年月日: 2010年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:シンガポール共和国  

  117. 製膜ひずみとコア流動を利用した金属被覆ナノワイヤの曲げ加工

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会 

     詳細を見る

    開催年月日: 2010年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  118. 002 製膜ひずみとコア流動を利用した金属被覆ナノワイヤの曲げ加工(GS1-1 一般セッション)

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会 

     詳細を見る

    開催年月日: 2010年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    Various methods have been proposed for fabricating nanocoils in order to extend the range of elements for building nanodevices. Most of these methods are based on self-assembly technique. We have previously demonstrated an alternative method in which a straight nanowire is bent by depositing a thin film on the nanowire. The bending is due to the misfit strain of the coated film. However, nanocoil formation using this method is highly inefficient. In this study, we developed an advanced method in which the helical formation of coated nanowires takes place because of the viscous flow of the core material, i.e., the nanowires, and the misfit strain of the coating film. When the melting temperature of the nanowire material is lower than that of the coating, elevating the temperature induces a viscous flow, i.e., creep, which only occurs in the nanowire. The creep releases the constraint of the nanowire on elastic bending due to film strain.

    CiNii Article

  119. T0301-1-4 コア流動法によるナノコイル形成の曲率制御([T0301-1]金属ナノ材料の創製と展開(1))

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会 

     詳細を見る

    開催年月日: 2010年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    Various methods have been proposed for fabricating nanocoils in order to extend the range of elements for building nanodevices. Most of these methods are based on self-assembly technique. We have previously demonstrated an alternative method in which a straight nanowire is bent by depositing a thin film on the nanowire. The bending is due to the misfit strain of the coated film. However, nanocoil formation using this method is highly inefficient. In this study, we developed an advanced method in which the helical formation of coated nanowires takes place because of the viscous flow of the core material, i.e., the nanowires, and the misfit strain of the coating film. When the melting temperature of the nanowire material is lower than that of the coating, elevating the temperature induces a viscous flow, i.e., creep, which only occurs in the nanowire. The creep releases the constraint of the nanowire on elastic bending due to film strain.

    CiNii Article

  120. 104 コア流動による金属被覆ナノワイヤのコイル形成(学生賞I,一般講演)

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会 

     詳細を見る

    開催年月日: 2010年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

    CiNii Article

  121. ナノワイヤの真性ひずみ誘起曲げ加工条件の実験的検討

    徳 悠葵, 村岡 幹夫

    精密工学会東北支部学術講演会 

     詳細を見る

    開催年月日: 2009年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  122. Evaluation of Electric Current-Induced Improvement of Fracture Characteristics in SUS316

    Yoon Sungmin, Kimura Yasuhiro, Cui Yi, Toku Yuhki, Ju Yang

    MATERIALS TRANSACTIONS  2021年  公益社団法人 日本金属学会

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    会議種別:口頭発表(一般)  

    <p>The application of high-density pulsed electric current (HDPEC) is one of the effective methods for the modification of material properties in metals. To evaluate fracture behavior modified by HDPEC, critical fracture parameters such as fracture strength, fracture toughness, and fracture profile of crack tip are important criteria. This work investigates the finite element analysis (FEA) based evaluation of improved fracture characteristics by the application of HDPEC in a SUS 316 austenite stainless steel. Tensile tests were first conducted to deduce the modified material properties with different conditions of HDPEC. A series of theoretical considerations was employed to estimate the modified fracture toughness. The relationship between critical fracture strength and critical crack length was numerically determined based on the estimated fracture toughness. The results in FEA showed that critical von Mises stress on the singularity at the crack tip increases as the effect of HDPEC increases. The evolution of increased fracture toughness with respect to conditions of HDPEC was specified. Crack opening profiles were simulated to assist the explanation. The evaluation of fracture parameters in this study proposes that the modified material properties by HDPEC play a positive role to resist crack propagation.</p>

    CiNii Article

  123. Evaluation of Electric Current-Induced Improvement of Fracture Characteristics in SUS316

    Yoon Sungmin, Kimura Yasuhiro, Cui Yi, Toku Yuhki, Ju Yang

    MATERIALS TRANSACTIONS  2021年  公益社団法人 日本金属学会

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    会議種別:口頭発表(一般)  

    <p>The application of high-density pulsed electric current (HDPEC) is one of the effective methods for the modification of material properties in metals. To evaluate fracture behavior modified by HDPEC, critical fracture parameters such as fracture strength, fracture toughness, and fracture profile of crack tip are important criteria. This work investigates the finite element analysis (FEA) based evaluation of improved fracture characteristics by the application of HDPEC in a SUS 316 austenite stainless steel. Tensile tests were first conducted to deduce the modified material properties with different conditions of HDPEC. A series of theoretical considerations was employed to estimate the modified fracture toughness. The relationship between critical fracture strength and critical crack length was numerically determined based on the estimated fracture toughness. The results in FEA showed that critical von Mises stress on the singularity at the crack tip increases as the effect of HDPEC increases. The evolution of increased fracture toughness with respect to conditions of HDPEC was specified. Crack opening profiles were simulated to assist the explanation. The evaluation of fracture parameters in this study proposes that the modified material properties by HDPEC play a positive role to resist crack propagation.</p>

    CiNii Article

  124. Assessment of creep behavior using a damage-coupled model for martensitic stainless steel

    YOON Sungmin, KIMURA Yasuhiro, TOKU Yuhki, JU Yang, PARK Soojeong, KIM Yunhae

    Mechanical Engineering Journal  2021年  一般社団法人 日本機械学会

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    記述言語:英語   会議種別:口頭発表(一般)  

    <p>In this study, the Liu–Murakami (LM) creep damage-coupled model was considered to evaluate the creep properties of martensitic stainless steel. The degree of creep damage was examined at two temperatures (565 ℃ and 593 ℃) to assess mechanically and thermally activated processes. A series of high applied stresses (applied stress/ultimate strength > 0.5) was considered for accelerated creep loadings. A full set of creep constants was determined by combining the Norton and LM models. Constitutive equations were used to quantitatively estimate experimental creep curves. The variation in creep constants was discussed based on stress sensitivity, such as stress triaxiality and applied stress, depending on the power of stress. The creep strain–time curves were successfully estimated. The comparison between the experimental and analytical results was in good agreement in the tertiary regime. In addition, the compensation of the two applied temperatures provides a supplementary explanation of the relationship between the ultimate strength and rupture time in terms of temperature sensitivity. The analytical results show that different applied stresses and temperatures could be compensated to characterize the creep behavior of the material. Thus, the creep strain–time and creep strain rate–certain rupture time curves were finally achieved. The analytical process in this study provides a laboratory-scale assessment of creep properties using the accelerated creep test and LM model.</p>

    CiNii Article

  125. エレクトロマイグレーションによる金属マイクロ・ナノワイヤ創製のための機構開発

    伊藤 佑太, 木村 康裕, 徳 悠葵, 巨 陽

    年次大会  2020年  一般社団法人 日本機械学会

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    会議種別:口頭発表(一般)  

    CiNii Article

  126. 高周波高密度電流が銅薄膜の密着強度に及ぼす影響

    安田 和弘, 木村 康裕, 徳 悠葵, 巨 陽

    年次大会  2020年  一般社団法人 日本機械学会

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    会議種別:口頭発表(一般)  

    CiNii Article

  127. CAF が細胞外マトリックスを介してがん細胞の浸潤場に与える力学的影響 国際会議

    大島 叶, 森田 康之, 大内田 研宙, 徳 悠葵, 巨 陽

    バイオエンジニアリング講演会講演論文集  2019年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  128. カーボンナノチューブシートを用いたフレキシブル透明導電膜の開発 国際会議

    田口 託土, 木村 康裕, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス  2019年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In Recent years, the demand of transparent conductive films (TCFs) has been increased widely due to the potential application for electronic devices, such as touch panels, liquid crystal displays, and transparent electrodes. With the development of flexible devices, TCFs are required to be flexible. However, indium tin oxide (ITO), the most widespread material used for TCFs, is brittle ceramic material and expensive. Therefore, instead of ITO, TCF materials have to be flexible and low cost. Multiwalled carbon nanotubes (CNT) sheet has been studied as a replacement for ITO owing to its flexibility and low cost. However, the sheet resistance of CNT sheet is still higher than that of ITO: the values of 1000to 1500 Ω/□. One of the reasons is the contact resistance of each other of CNTs in a CNT sheet. In this study, metal nanoparticles were coated on the CNT sheet to reduce the contact resistance. After being coated with Cu/Ni, the contact resistance was modified and the sheet resistance was reduced to 300 Ω/□ or less, while the transmittance at the wave length of 550 nm maintains 80 % or higher. The results provide that CNT sheet is a promising candidate for flexible TCF material, realizing more effective production at lower cost than ITO.</p>

  129. がん関連線維芽細胞ががん細胞の浸潤力学場に及ぼす影響 国際会議

    大島 叶, 森田 康之, 大内田 研宙, 徳 悠葵, 巨 陽

    バイオエンジニアリング講演会講演論文集  2019年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  130. がん細胞浸潤挙動に対する細胞外基質弾性率の影響 国際会議

    牛田 雅人, 森田 康之, 大島 叶, 徳 悠葵, 巨 陽

    年次大会  2019年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Cancer cells are known to lead human death, but they are difficult to treat. The reason is that the mechanism of metastasis has not been elucidated. Since cancer cells are known to induce the hardening and moving surrounding tissues i.e. extracellular matrix (ECM), this study aimed to increase the elastic modulus of ECM without changing the density of collagen fibers. The crosslinking agent (EDCNHS) was used for this purpose. By making collagen gel with administering the crosslinking agent, it was succeeded to increase the elastic modulus of ECM up to 5 times approximately than the case without crosslinking agent. Based on this result, it is possible to observe the infiltration behavior of cancer cells with the difference of elastic modulus under three-dimensional culture by enclosing cancer cells in the collagen gel.</p>

  131. DVC Measurement on the Deformation Field of ECM Surrounding a Tumor Spheroid During the Invasive Progression

    Morita Yasuyuki, Nakano Yusuke, Oshima Kanau, Toku Yuhki, Ju Yang

    Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics  2019年  一般社団法人 日本機械学会

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    記述言語:英語   会議種別:口頭発表(一般)  

  132. Cu<sub>2</sub>Oナノ構造体の形状最適化および表面修飾による太陽光水分解変換効率の向上 国際会議

    泉 友里, 木村 康裕, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス  2019年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Recently, Cu<sub>2</sub>O has been considered as an attractive material for solar water splitting due to its excellent characteristics such as small bandgap, visible light adsorption, abundance, and nontoxicity. The theoretical solar-to-hydrogen conversion efficiency (STH) of Cu<sub>2</sub>O is 18% for water splitting. To date, the value experimentally obtained by previous works has not attained and overcomed above ideal value, because of the lack of Cu<sub>2</sub>O in photocathode to absorb sunlight efficiently, the short diffusion length of minority cariers, and the Cu<sub>2</sub>O photocorrosion during water splitting. 3D nanostructures for water splitting and surface modification contribute to resolving these issues. Nanostructures can improve STH owing to high surface-to-volume ratio and short diffusion length for carrier transport compared with bulk materials. In addition, surface modification enables to promote the separation of photogenerated electron-hole pair and to protect the photoelectrode against photocorrosion, and thus resulting in the enhancement of stability in Cu<sub>2</sub>O photocathode. The present study aimed to improve STH and stability in Cu<sub>2</sub>O photocathode for water splitting by optimizing morphology of Cu<sub>2</sub>O nanostructures and surface modification. In order to determine the suitable conditions for water splitting, the relationship between the morphology of the structure and STH was examined. The photocathode with Cu<sub>2</sub>O nanostructures exhibited maximum photocurrent density of 4.58 mA/cm<sup>2</sup> at a potential of 0 V vs. reversible hydrogen electrode (RHE) and STH of 5.63%. Besides, surface modification was successfully introduced by covering nanostructures with homogeneous and conformal layers formed by atomic layer deposition (ALD).</p>

  133. CAF共培養下におけるがん細胞周囲の力学場および線維構造の三次元計測 国際会議

    大島 叶, 森田 康之, 大内田 研宙, 木村 康裕, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス  2019年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Invasion of cells plays a major role in metastasis. Cancer cells interact with cancer-associated fibroblasts (CAFs) present in the tumor microenvironment and as a result enhance their invasive ability. However, the overall mechanism of the interaction has not been clarified. When cancer cells moving, they constantly exert power on the surrounding extracellular matrix (ECM). In addition, the material properties of the ECM are not uniform because the fiber structure constantly changes. Therefore, measuring the mechanical field around cancer cells is significant in revealing the interaction between cancer cells and CAFs. In this study, we analyze what kind of change is caused in the mechanical field of ECM around a cancer cell by the effects of CAFs under three dimensional culture. We cultured the pancreatic ductal carcinoma cells, SUIT-2 with the orthotopic CAFs in collagen gel. Three-dimensional images were acquired by a confocal microscope. Embedding the fluorescent beads in the gel at the same time, the beads adhere to the collagen and form a pattern, therefore it is possible to track the displacement field by using the digital volume correlation (DVC) method. At the same time, the collagen fiber density and orientation were evaluated based on 3D images. As a result, accumulation and arrangement of collagen fibers were observed in the direction of CAF protrusion, and it became clear that cancer cells under the influence of CAFs generate a dynamic field in a wider range.</p>

  134. マイクロ波を用いたステンレス合金の非接触ひずみ計測 国際会議

    伊藤 篤志, 徳 悠葵, 巨 陽

    年次大会  2019年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Stainless alloy is widely used in implants, dams and bridges because of its high corrosion resistance. However, these structures can be exposed to loads during their useful life and cause plastic deformation. Therefore, it is essential to know the plastic strain of the material in order to control the quality of the product. The conventional way to measure strain is the strain gauge method, but since physical contact is required at the time of gage attachment, a method to measure strain in non-contact fashion is required. Therefore, in this research, we focused on microwaves often used in nondestructive testing. Microwaves have less influence on the human body compared to X-ray. Unlike ultrasonic waves, microwaves do not require a transmission medium and can propagate in air favorably and at high speed. Therefore, we used microwaves to measure the electrical resistivity of plastically deformed test pieces. As a result, correlations were confirmed between the measured electrical resistivity and strain, and it was shown that the strain of stainless steel could be evaluated from the measured electrical resistivity.</p>

  135. 高密度パルス電流を利用したチタン合金の機械的特性の向上 国際会議

    岩瀬 累, 木村 康裕, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス  2019年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Titanium alloys have been widely used in versatile productions due to their excellent mechanical properties. Conversely, the effective technique for the improvement of mechanical properties is required. Although heat treatment is used to enhance the mechanical properties, it increases processing cost. Recently, high-density pulsed electric current (HDPEC) has been studied for repairing defects and damages in metallic materials. Therefore, it would be expected to improve mechanical properties of Titanium alloy by applying HDPEC instead of heat treatment. This work studied the effect of HDPEC on the mechanical properties of Titanium alloy Ti-6Al-4V. Tensile test was conducted after applying HDPEC to the material. The application of HDPEC contributes to improve the elongation and tensile strength of 10% and 3.2% compared to unapplied ones, respectively. In addition, Vickers hardness was decreased with increasing current density. The change in the microstructure of the material before and after applying HDPEC was observed based on the X-ray diffraction analysis: The rate of <i>β</i>-phase in the material was increased by applying HDPEC. As a result, the mechanical properties of titanium alloy were improved by applying HDPEC due to the phase transformation.</p>

  136. 高周波高密度電流を利用したAu薄膜の密着強度の向上 国際会議

    木澤 蔵馬, 木村 康裕, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス  2019年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In recent years, electronic devices have remarkably achieved miniaturization and high performance with the development of MEMS. In addition, the current density in the interconnect has risen due to the increase of electric energy accompanying the development of power devices. The delamination of thin film due to thermal stress and electromigration has become a problem. One method to improve the adhesion strength of thin film on a substrate is using an adhesion layer such as Cr or Ti between the thin film and the substrate. However, this method has the disadvantages that additional materials are required and the thickness of the interconnect increases. The adhesion strength of the thin film needs to be improved itself. This study proposed a method to apply high-density current with high frequency to thin film to improve the adhesion strength of it. The Au thin film (Size: 5 mm×45 mm×150 nm) was deposited on a glass substrate by radio frequency sputtering. Then, high-density current with high frequency was applied in thin film and the adhesion strength was measured by using peel test. As a result, the adhesion strength was improved by 20% or greater by applying high-density current with high frequency. Therefore, this method is expected to be a new strength improvement method for thin film.</p>

  137. 温度応答性高分子を応用した機能性 DDS の開発 国際会議

    小林 耕大, 森田 康之, 徳 悠葵, 巨 陽

    バイオエンジニアリング講演会講演論文集  2019年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  138. 温度応答性高分子を利用した放出制御型DDSキャリアの開発 国際会議

    小林 耕大, 森田 康之, 脇本 卓摩, 木村 康裕, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス  2019年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Drug delivery system (DDS) is able to realize the treatment of cancer with lower side effects and higher efficiency comparing to conventional chemotherapy by controlling the in vivo dynamics of drugs. In recent years, there are many studies regarding to the release control of anticancer drug loaded in DDS in order to enhancing its performance. However, so far the reported controllable drug release DDSs require external stimulation such as light and cooling as triggers for drug release, which cannot reach the deep part inside the human body. To control the release in the deep part inside the human body, here, we aimed at to develop a new DDS carrier which can control drug release by applying magnetic field. Magnetic mesoporous silica (MMS) and ureido-containing poly (allylamine-co-allylurea) copolymers (PAU) were used in this study. PAU is a kind of polymer having upper critical temperature. By modifying it to the surface of magnetic mesoporous silica, it is possible to realize the control of drug release of the DDS carrier triggered by the core heat generation induced by an alternating magnetic field, thereby realizing the control of drug release in the deep part inside the human body. DDS carrier developed in this research enables highly efficient treatment that combines hyperthermia with core heat generation and drug treatment with drug release at the cancer in the body. To synthesize PAU modified MMS (MMS-PAU), magnetite was prepared by thermal decomposition method and MMSs were synthesized by a template method. PAU was prepared by reacting polyallylamine with potassium cyanate. Finally, PAU was grafted on the surface of MMS by introducing amide bonds. We confirmed that MMS-PAU has the drug release control ability and MMS-PAU is effective for cancer therapy.</p>

  139. 機械的伸縮刺激を用いた間葉系幹細胞の腱細胞分化誘導に対する伸縮波形の影響 国際会議

    丹羽 光司, 森田 康之, 徳 悠葵, 巨 陽

    生体医工学  2019年  公益社団法人 日本生体医工学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>幹細胞に伸縮刺激を与えると機能亢進が起こる. そのメカニズムは明らかにされていないが, 近年の研究で伸縮周波数が大きな影響を持つことが示唆されている. 本研究では腱細胞への分化に焦点をあて,遺伝子発現量を観察することで, 間葉系幹細胞の腱分化特性を評価する. 初めに,伸縮刺激を各細胞に一様に加えることを目的に細胞培養膜を作製し, 細胞の配向を制御した. その後, 周波数を0.1~10Hzと広域に設定し, 伸縮実験を行った.その結果,腱組織の生理環境に近い0.1および1Hzの領域で大きな遺伝子発現が見られた.</p>

  140. Evaluation of Local Dielectric Constant of Biomaterial Based on the Force-distance-curve Measured by Microwave Atomic-force Microscope 国際会議

    Zhao M

    MHS 2018 - 2018 29th International Symposium on Micro-NanoMechatronics and Human Science  2018年12月  MHS 2018 - 2018 29th International Symposium on Micro-NanoMechatronics and Human Science

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    記述言語:日本語   会議種別:口頭発表(一般)  

  141. Improvement of Thin Film Adhesion Strength via Current Application

    Y. Toku, K. Kizawa, K. Sugiura, Y. Morita, Y. Ju

    Asia-Pacific Conference on Fracture and Strength 2018  2018年10月 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Xi'an, China  

  142. ELECTROMAGNETIC PERFORMANCE OF SPIRALLY DEFORMED COATED NANOWIRES

    Y. Toku, Y. Ueda, Y. Morita, Y. Ju

    Recent Developments in Integrity - Reliability - Failure  2018年7月 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Lisbon, Portugal  

  143. Cu<sub>2</sub>O三次元ナノ構造体の創製と水分解光電極への応用 国際会議

    泉 友里, 徳 悠葵, 森田 康之, 巨 陽

    年次大会  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  144. カーボンナノチューブアレイの密度および配向性制御によるカーボンナノチューブシート紡績性の向上 国際会議

    田口 託土, 徳 悠葵, 森田 康之, 巨 陽

    年次大会  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  145. がん細胞スフェロイドが浸潤する際の細胞外マトリックスの応力場計測 国際会議

    中野 優亮, 森田 康之, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>When tumor cells metastasize, invasion of cells plays a major role. The tumor cells initiate invasion by generating force and changing the physical structure of the extracellular matrix (ECM) surrounding the tumor. However, the detail process of changing the structure of the ECM has not been elucidated. At this time, measuring the mechanics field generated in the ECM is an important way to understand behavior of tumor cells in 3D. Therefore, in this study, spheroids, which are the source of the invasion as a tumor cells, were embedded in a collagen gel, and the deformations of the collagen gel surrounding the spheroids were measured. Using the DVC method, the matrix deformations around spheroids were measured by tracking the 3D positions of fluorescent beads embedded in the collagen gel. To photograph the initial state of the ECM, we added tritonX-100 to the spheroid at the end of the experiment and photographed the state of no stress from the spheroid. In addition, we calculated the divergence of the deformations field and discussed on density change of ECM. As a result, it was found that spheroids systematically generate the deformation field and change the density of ECM. It was suggested that invasion occurs in the low density part.</p>

  146. SnO<sub>2</sub>ナノベルトの形状・密度制御に関する研究 国際会議

    戸川 陽介, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In recent years, various nanostructure materials such as nanowires, nanorods and nanobelts have been studied widely due to their excellent properties. Especially, much attention was paid by researchers in the preparation of oxide nanostructure materials due to their good optical and electrical properties. Numerous oxide nanostructure materials were synthesized so far, among which SnO<sub>2</sub> is considered to be an important one, because it is a typical n-type semiconductor. Particularly, SnO<sub>2</sub> nanobelts exhibited extensive optoelectronic and gas-sensitive properties which make them being excellent candidates for a wide range of applications such as gas sensors and transparent conductive film. SnO<sub>2</sub> nanobelt is generally synthesized by thermal evaporation method, but it is difficult to control the shape, size and density of SnO<sub>2</sub> nanobelts in the thermal evaporation process. However, since the elastic modulus and conductivity of the nanobelt depend on its shape and size, it is important to control shape and size of nanobelt. Hence, in this study, we adjusted experimental parameters such as pressure during heating and concentrations of gold nanoparticle solution to control the shape and size of nanobelts. From the scanning electron microscope image, we found that the aspect ratio of cross-section was controlled by pressure during heating. The results show that we succeeded in controlling the aspect ratio of cross-section and density of the SnO<sub>2</sub> nanobelts. From the above, it is expected that the improvement of flexibility and transparency of a transparent conductive film could be realized.</p>

  147. IMPROVEMENT OF ADHESION STRENGTH OF THE COPPER NANOWIRE SURFACE FASTENER BY INVESTIGATING THE DIAMETER RATIO OF NANOWIRES

    Kato Motohiro, Toku Yuhki, Morita Yasuyuki, Ju Yang

    IRF2018: PROCEEDINGS OF THE 6TH INTERNATIONAL CONFERENCE ON INTEGRITY-RELIABILITY-FAILURE  2018年 

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    記述言語:英語   会議種別:口頭発表(一般)  

  148. 放出制御型DDSの目指したコアシェル型ナノ粒子への温度応答性高分子の利用 国際会議

    小林 耕大, 森田 康之, 脇本 卓摩, 徳 悠葵, 巨 陽

    年次大会  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  149. 高密度電流を利用したAu薄膜の密着強度の向上 国際会議

    木澤 蔵馬, 徳 悠葵, 巨 陽

    機械材料・材料加工技術講演会講演論文集  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  150. 電気塑性効果を利用したステンレス合金の機械的特性の向上 国際会議

    岩瀬 累, 徳 悠葵, 森田 康之, 巨 陽

    年次大会  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  151. 銅ナノワイヤ面ファスナーの接着強度向上に向けた影響因子の最適化 国際会議

    加藤 大博, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In recent years, connecting techniques using conductive nanomaterials imitating gecko's feet, for example, metal nanowires, carbon nanotubes and conductive polymer materials as a surface fastener have been reported. These connecting techniques utilize van der Waals force generated between the surfaces of nanomaterials. Recently, we have developed the copper nanowire surface fasteners (Cu NSF) as a conductive connector. Since copper has high electrical conductivity and is inexpensive, the Cu NSF can be expected to be practically used as a new surface mounting technique. Moreover, Cu NSF can be connected at room temperature utilizing van der Waals force, so that it is possible to avoid the damage to electronic parts during solder reflow process. However, the adhesion strength of current Cu NSF is still small as compared with traditional solders. The reason is considered that the contact areas of the nanowires were not sufficient because the nanowires collided and collapsed during connecting. In this research, we attempted to increase the contact area of nanowires for improving adhesion strength of Cu NSF. The adhesion strength of the Cu NSFs having nanowires with 100 nm and 400 nm diameter reached the largest value, and increasing with the increase of preload. This investigation showed that the contact areas of nanowires increased and mechanical entanglement of nanowires occurred because of increasing the preload of connecting.</p>

  152. 酸化亜鉛薄膜を用いた多点型微小圧力検出センサの開発 国際会議

    河合 航大, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Cancer is one of the three major causes of death in Japan. The 90% of patients with cancer dies from metastasis. Therefore, it is essential to do the cancer treatment properly, in which the metastasis should be prevented or the place should be predicted where the cancer cells are going to spread to. However, the mechanical mechanism of metastasis is still under research. We attempt to develop a pressure sensor array that can continuously measure the force of nN order generated by the cancer cells in a distributed manner. The requirements that a pressure sensor array need to meet are as follows: the pressure sensor array must adhere to the surface of a cancer cell via many points, besides, it could measure the magnitude of the force (nN). The zinc oxide (ZnO) thin film, as the piezoelectric material, offers a desirable approach to fulfilling the need for measurement of the mechanical field generated by the cancer cells. In our research, we fabricated a set of plural sensors (Size: 100 μm×100 μm, Thickness: 1 μm) on a substrate by using the methods of sputtering and photolithography. In other words, we developed a multi-point pressure sensor array. The main purpose of this study is to evaluate the sensitivity of the sensor, we used Au or Cr buffer layers, on which the ZnO thin film was formed, to find out the influence of the sensitivity of the sensor. Moreover, we measured the output voltage as a function of the load by using the sensor. In summary, the result of experiments shows that the sensitivity of the sensor is 5.31 mV/N.</p>

  153. 透明導電膜作製に向けた応力誘導原子拡散による単結晶Alナノワイヤアレイの創製 国際会議

    田中 悠貴, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In recent years, the development of a transparent conductive film using metal nanowires (NW) as a dispersing material has been carried out. Recent studies have reported many methods for fabricating transparent conductive films using Ag NW. However, Ag is a rare metal and there is a problem that the price is susceptible to market fluctuations. In order to utilize inexpensive Al NW as a new dispersing material, we developed a single crystal Al NW array fabrication method. The present method utilizes atomic diffusion to convert Al atoms to NW shape. Compressive stress and stress gradient in the Al thin film which is generated due to the difference in linear expansion coefficient between Al and Si when heating the Al / Si substrate. The atomic diffusion phenomenon caused by such stress is called stress migration (SM). It is a major feature of this method that NW generation is possible with two simple steps, film formation and heating. However, this method has a problem that the generation density of Al NW is low. In this research, we tried to increase the stress gradient by partial etching of Al film and introduce adhesion intermediate layer, and tried to improve generation density. As a result, we could get high density of Al NW with etching depth 10 nm and Cr film thickness 1.5 nm.</p>

  154. 細胞外基質の弾性率が幹細胞分化時の力学場に与える影響 国際会議

    山本 陵介, 森田 康之, 徳 悠葵, 巨 陽

    バイオエンジニアリング講演会  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  155. 異なる細胞外基質弾性率での幹細胞分化過程における力学場計測 国際会議

    森田 康之, 山本 陵介, 徳 悠葵, 巨 陽

    年次大会  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  156. 熱酸化および還元プロセスによるCu<sub>2</sub>Oナノワイヤアレイの創製と太陽光水分解への応用 国際会議

    Yiqi ZHANG, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>It is well-known that traditional fossil energy sources such as oil are limited. Hydrogen is attracting the attention of the world because it is renewable, plentiful in supply, clean and non-toxic. Cu<sub>2</sub>O is a promising material for solar water splitting because it has an impressive performance as photocathode. It is a p-type semiconductor and with a band gap of 2.0 eV, which could theoretically deliver a solar to hydrogen conversion efficiency of 18% for water splitting. In this research, we use tube furnace to fabricate Cu<sub>2</sub>O nanowire (NW) by thermal oxidation and reduction process of thin copper plate. Different experimental conditions (temperature, time and gas flow rate) were investigated to find out the best parameters for nanowire synthesis (diameter, length, and number density of NW) which is better for the photoelectrochemical system.</p>

  157. 温度刺激に対する高分子の相転移特性を用いたナノ粒子の薬剤放出制御 国際会議

    脇本 卓磨, 森田 康之, 徳 悠葵, 巨 陽

    バイオエンジニアリング講演会  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  158. 油滴メカニカルセンサを用いたがん細胞集団の応力測定 国際会議

    梅井 航, 森田 康之, 徳 悠葵, 巨 陽

    バイオフロンティア講演会講演論文集  2018年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  159. Cu<sub>2</sub>O/Cuコアシェルナノワイヤアレイによる太陽光水分解光電極の作製 国際会議

    笠原 龍太郎, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2017年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In recent days, hydrogen is considered as an alternative energy which could instead of the fossil fuel in the future. A new clean method to manufacture hydrogen gas is called solar water splitting. Cu<sub>2</sub>O is considered as a promising and attractive material for solar driven hydrogen production because the suitable band gap (ca. 2.0 eV) and the low cost. Based on the band gap, it can be calculated the maximum theoretical light-to-hydrogen conversion efficiency is 18% at AM 1.5 spectrum, and the theoretical photocurrent of 14.7 mA/cm<sup>2</sup>. However, the experimental conversion efficiency was much lower than the theoretical one, due to self-corrosion coinciding with water-splitting reaction and that an electron and a hole activated by the sun light irradiation are easily recombined in oxidation film. In this research, Cu<sub>2</sub>O/Cu core-shell Nanowire (NW) has been fabricated on the surface of the photoelectrode by the polycarbonate template method to increase the conversion efficiency by optimizing the NW structure. We have investigated the relationship between NW's structure and photocurrent density, as well as incident photo to current efficiency (IPCE). As a result, we find the optimum conditions of NW's diameter and oxidation time. The visible light responsiveness from IPCE results has also been confirmed.</p>

  160. バッファ層がZnO薄膜の圧電特性に及ぼす影響 国際会議

    河合 航大, 徳 悠葵, 森田 康之, 巨 陽

    年次大会  2017年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Three-dimensional manipulation is necessary to make assembly operations during fabricating micro/nano-scale devices. However, it is difficult to release the objects at nanoscale due to the adhesion force between object and manipulator. Some researchers have developed manipulation devices which can reduce the adhesion force by utilizing the inertial force generated by vibrating the microcantilever with a bulk piezoelectric material placed near the base of it. However, there is still a problem of size, and it has not been applied to a narrow space such as a scanning electron microscope chamber. In order to further downsize the manipulator, simplification of the manipulation devices by using thin film piezoelectric materials instead of bulk piezoelectric ones and directly attaching to the microcantilever is effective. In this case, it is important to select the buffer layer which is originally used for relaxing the lattice mismatch to enhance the piezoelectricity of the thin film. In this study, the influence of buffer layer on piezoelectric properties of ZnO thin film was investigated. The deflection was measured when AC voltage was applied to the cantilever fabricated with ZnO thin film and the cross section of the cantilever were observed. As a result, using the Cr buffer layer rather than using Al buffer layer, the average of the cantilever tip displacement at each applied voltage was approximately 6 times larger and the piezoelectricity of the ZnO thin film was improved.</p>

  161. ナノワイヤの直径比最適化によるナノワイヤ面ファスナーの接着強度向上 国際会議

    加藤 大博, 徳 悠葵, 森田 康之, 巨 陽

    年次大会  2017年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Lead-free solder has been used for surface mounting of electronic devices in consideration of the environment. However, there is a concern that the electronic parts may be damaged by heating during bonding because the lead-free solder has a high melting point. Therefore, development of a new bonding technique without heating is required. There are many studies on nanowires because of their unique characteristics which are different from bulk materials. In this paper, we fabricated Cu nanowire surface fasteners and investigated the improvement of strength by changing the diameter ratio of nanowires. Cr and Au films were formed as electrodes on glass substrates by sputtering. According to the template method, the polycarbonate template was fixed on one electrode to fabricate Cu nanowires by electrodepositing in the CuSO<sub>4</sub>·5H<sub>2</sub>O solution. After removing the template by etching with dichloromethane, the Cu nanowire surface fastener was fabricated. By applying a preload, the Cu nanowire surface fasteners were connected. Thereafter, the adhesion strength of the Cu nanowire surface fastener was evaluated by a tensile test. The highest bonding strength was found to be 162.6 N/cm<sup>2</sup> while the combination of the nanowire array with the diameter ratio of 1:4. Nanowires intertangling with each other was assumed to be an additional effect on the van der Waals force between nanowires.</p>

  162. デジタル画像相関法を用いた伸展下における細胞内力学場計測 国際会議

    梅井 航, 森田 康之, 徳 悠葵, 巨 陽

    年次大会  2017年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  163. がん細胞の浸潤力学場に上皮間葉転換が及ぼす影響の 4 次元 DVC 計測 国際会議

    山内 崇司, 森田 康之, 徳 悠葵, 巨 陽, 河瀬 直樹

    バイオエンジニアリング講演会講演論文集  2017年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  164. Fe<sub>3</sub>O<sub>4</sub>@mSiO<sub>2</sub>-tLyP-1 ナノ粒子を用いた標的指向型 DDS の開発 国際会議

    森田 康之, 櫻井 涼平, 脇本 卓磨, 徳 悠葵, 巨 陽

    バイオエンジニアリング講演会講演論文集  2017年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  165. Effect of pulsed electric current on the mechanical properties of titanium alloy

    Jung J

    ICF 2017 - 14th International Conference on Fracture  2017年  ICF 2017 - 14th International Conference on Fracture

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    記述言語:英語   会議種別:口頭発表(一般)  

  166. DVC法を用いたがん細胞スフェロイドの浸潤力学場計測 国際会議

    中野 優亮, 森田 康之, 山内 崇司, 徳 悠葵, 巨 陽

    M&M材料力学カンファレンス  2017年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>When tumor cells metastasize, invasion of cells plays a major role. In particular, invasion of epithelial tumor cells is induced by performing epithelial-mesenchymal transition (EMT). EMT is a process that have high motility induced by external factors in which epithelial cells are transformed into mesenchymal cells. It is a very important process in invasion. The tumor cells generate forces during cell invasion through a three-dimensional (3D) matrix. Measuring the mechanics field generated in the Extracellular Matrix (ECM) surrounding the cells is an important way to understand the behavior of tumor cells in 3D environment. Therefore, in this study, spheroids, which are the source of the invasion for tumor cells, were embedded in a collagen gel, and the deformations of the collagen gel surrounding the spheroids were measured. Using the DVC method, the matrix deformations around spheroids were measured by tracking the 3D positions of fluorescent beads embedded in the collagen gel. In addition, we added TGF-β1 which facilitates the invasion of tumor cells, and the influence of TGF-β1 on the mechanical property of spheroids was quantitatively evaluated. As a result, it was found that the maximum displacement of spheroids treated with TGF-β1 is larger than that of the one's without TGF-β1 treatment.</p>

  167. マイクロ波原子間力顕微鏡の力変化による局所誘電率の定量評価 国際会議

    トン 博, 趙 岷吉, 徳 悠葵, 森田 康之, 巨 陽

    計算力学講演会講演論文集  2017年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    Microwave atomic force microscopy (M-AFM) is designed to realize the non-contact measurement of topography and electrical property at nanoscale simultaneously. For the evaluation of dielectric materials, since the detected reflected signal depends strongly on the probe-sample distance, in non-contact mode the quantitative evaluation regardless of the effect of distance is difficult. In this study, the effect of microwave on the force between the probe and dielectric materials was investigated. A theoretic model based on the reflection of electromagnetic wave was established to describe the distance dependence of microwave intensity between sample and probe. The relationship between the force gradient and sample permittivity was obtained and the permittivity of Al<sub>2</sub>O<sub>3</sub>, Ge, and ZrO<sub>2</sub> was evaluated using this theoretical model.

  168. 薄膜残留応力を利用した金属被覆ナノベルトのゼンマイ形成に関する研究 国際会議

    戸川 陽介, 徳 悠葵, 森田 康之, 巨 陽

    年次大会  2017年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>In recent years, various nanomaterials have been studied and a wide variety of applications have been attracted as the outcome of nanotechnology development. As research progresses, it can be expected that nanomachine technology will be a future subject. In this case a nanoscale power source is necessary, but it has not yet been put to practical use. Therefore, we propose a nanoscroll as a new nanoscale energy storage device. The advantage of nanoscroll is that they can storage energy with high efficiency and high density, and can be used as actuators by a simple procedure. We have built up a new material processing method for bending deformation of nanomaterials. In previous study, we succeeded in forming nanocoils by applying this method to nanowires. In this study, we tried to create nanoscroll by applying it to nanobelt. We achieved creating the shape with different curvatures at the tip and root of the nanobelt by nonuniformly sputtering in longitudinal direction. The deformation in the pitch direction was also suppressed.</p>

  169. 機能性ナノワイヤ面ファスナーの接着強度および熱伝導性の向上 国際会議

    野々村 陸, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2017年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Solder has been used for the conventional bonding technology in electronic assembly for a long time. However, the traditional reflow soldering technique is characterized by high heating temperatures. Moreover, due to the progress of power devices, the working temperature in the electrical packages is increased. Therefore, we have proposed nanowire surface fastener (NSF) based on Cu nanowire arrays by which cold bonding for electrical packaging can be realized. Since copper is a high thermal conductive material, a satisfactory heat transfer characteristic is expected. In this paper, we investigated the improvements of the strength and thermal properties by changing the connecting load. The template method was used for fabricating Cu nanowire arrays, and the bonding strength of Cu NSF was evaluated by a tensile test. The highest bonding strength (205.06 N/cm<sup>2</sup>) was recorded when two nanowire arrays were connected by the connecting load of 125 N. Simultaneously, we measured the electrical resistance of Cu NSF by a four-terminal method. The electrical resistance showed the opposite behaviour to the bonding strength. Specifically, the larger connecting load we applied, the lower electrical resistance it showed. In metallic materials, since free electrons are carriers of the electric current and heat transfer, the electric conductivity and the thermal conductivity are closely related. Therefore, improvements of the electric and thermal conductivity are expected when electrical resistance decreases.</p>

  170. 伸縮刺激を用いた間葉系幹細胞の腱細胞分化に対する繰り返し周波数の影響 国際会議

    平野 勇勝, 森田 康之, 徳 悠葵, 巨 陽

    バイオフロンティア講演会講演論文集  2017年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  171. 自己変形発現により作製した金属被覆微小コイルの電磁気特性に関する研究

    上田 祐志, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2017年  一般社団法人 日本機械学会

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    会議種別:口頭発表(一般)  

    <p>It is important to evaluate the magnetic property of magnetic storage devices which has very small size due to minitualization and high density. In this study, we propose a new scanning magnetic sensor combined by Atomic Force Microscopy (AFM) system and conductive nanocoil probe. Conductive nanocoil probe having an AFM tip combined with conductive micro/nano coil is possible to be used for magnetic evaluation according to the principle of electromagnetic induction. Furthermore, the conductive nanocoil probe has a distinctive feature which unites both observation and control of magnetic state at very small size, because the magnetic control is possible by the impressing current to the coil. To fabricate nanocoil on the AFM tip, the method of fabricating micro/nano coils which is based on a mechanical process, i.e., a straight nanowire is bent by depositing a thin film with a circumferentially nonuniform thickness on the nanowire, was used. The bending of nanowire is due to the misfit strain of the coated film. In order to enhance the bending, the heat treatment was conducted to induce a creep flow in the nanocoil, and to release the constraint of the nanowire on elastic bending due to film strain. From the result, the fabrication of nanocoil on the AFM tip with a high conductivity on the scale of 10<sup>6</sup> Ω・m was achieved successfully.</p>

    CiNii Article

  172. カーボンナノチューブシートを用いた水素センサーの開発 国際会議

    厳 可逸, 徳 悠葵, 森田 康之, 巨 陽

    日本機械学会 第24回機械材料・材料加工技術講演会(M&P2016)  2016年11月 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:早稲田大学  

  173. ナノワイヤ面ファスナーのための低細孔密度ポーラスアルミナテンプレートの開発 国際会議

    宋 揚, 徳 悠葵, 森田 康之, 巨 陽

    日本機械学会 第24回機械材料・材料加工技術講演会(M&P2016)  2016年11月 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:早稲田大学  

  174. ナノワイヤ面ファスナーのための低細孔密度ポーラスアルミナテンプレートの開発 国際会議

    宋 揚, 徳 悠葵, 森田 康之, 巨 陽

    日本機械学会 第24回機械材料・材料加工技術講演会(M&P2016)  2016年11月  機械材料・材料加工技術講演会講演論文集

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:早稲田大学  

  175. Cu2O/Cu コアシェルナノ構造太陽電池のナノワイヤ密度が変換効率に与える影響 国際会議

    松尾 亮佑, 巨 陽, 森田 康之, 徳 悠葵

    日本機械学会 M&M2016材料力学カンファレンス  2016年10月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学  

  176. ストレスマイグレーションを利用した Al ナノワイヤの成長に及ぼす Al 薄膜構造の影響 国際会議

    鈴木 崇真, 徳 悠葵, 森田 康之, 巨 陽

    日本機械学会 M&M2016材料力学カンファレンス  2016年10月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学  

  177. DVC 法を用いた幹細胞分化時における細胞外基質の 3 次元力学場計測 国際会議

    山本 陵介, 森田 康之, 山内 崇司, 徳 悠葵, 巨 陽

    日本機械学会 M&M2016材料力学カンファレンス  2016年10月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学  

  178. マイクロ波が誘起する探針―試料間原子間力による局所誘電率評価 国際会議

    チョウ ミンキ, 徳 悠葵, 森田 康之, 巨 陽

    日本機械学会 M&M2016材料力学カンファレンス  2016年10月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学  

  179. マイクロ波原子間力顕微鏡を用いた局所導電率測定に及ぼす試料表面形状の影響 国際会議

    波多野 貴大, 徳 悠葵, 森田 康之, 巨 陽

    日本機械学会 M&M2016材料力学カンファレンス  2016年10月  M&M材料力学カンファレンス

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学  

    <p>With the development of nanotechnology in recent years, many researchers have focused on the development of nanomaterials and nanostructures. To apply these nanomaterials and nanostructures into nanodevices, the measurement technology for measuring electrical properties at high spatial resolution has been requested. Therefore, our group has developed Microwave Atomic Force Microscopy (M-AFM) in order to assess electrical conductivity in a minute area. This paper describes influence of material surface on the measurement of local electrical conductivity using M-AFM. Results of this experiment indicate actually that M-AFM can measure electrical conductivity in a local area accurately without being affected by the material surface.</p>

  180. マイクロ波原子間力顕微鏡を用いた局所導電率測定に及ぼす試料表面形状の影響 国際会議

    波多野 貴大, 徳 悠葵, 森田 康之, 巨 陽

    日本機械学会 M&M2016材料力学カンファレンス  2016年10月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学  

  181. マイクロ波を用いた熱可塑性炭素繊維強化プラスチックの繊維含有率測定技術の開発 国際会議

    田所 昴, 巨 陽, 森田 康之, 徳 悠葵

    日本機械学会 M&M2016材料力学カンファレンス  2016年10月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学  

  182. カーボンナノチューブ複合材料の強度向上に関 する実験的検討 国際会議

    笠原龍太郎, 徳 悠葵, 森田 康之, 巨 陽

    日本機械学会 2016年度年次大会講演会  2016年9月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:九州大学  

  183. 同軸構造を有するマイクロ波原子間力顕微鏡プローブの作製および評価 国際会議

    平林 貴大, 徳 悠葵, 森田 康之, 巨 陽

    日本機械学会 2016年度年次大会講演会  2016年9月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:九州大学  

  184. 薄膜残留応力を利用した被覆 Al ナノワイヤの自己変形 国際会議

    上田 祐志, 徳 悠葵, 森田 康之, 巨 陽

    日本機械学会 2016年度年次大会講演会  2016年9月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:九州大学  

  185. 熱疲労を受けるナノワイヤ面ファスナーの接続強度および電気的特性の評価 国際会議

    徳 悠葵, 野田 修二, 森田 康之, 巨 陽

    日本機械学会 第29回計算力学講演会 CMD2016  2016年9月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:名古屋大学  

  186. Influence of Thermal Fatigue on the Connection Strength of Nanowire Surface Fastener

    Y. Toku, S. Nota, Y. Morita, Y. Ju

    International multi-conference on engineering and technology innovation 2015  2016年8月 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:New York, USA  

  187. 機械的伸縮刺激による腱細胞分化に関する1細胞計測 国際会議

    山下 貴大, 森田 康之, 徳 悠葵, 巨 陽

    日本機械学会東海支部第65期総会・講演会  2016年3月18日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  188. マイクロビーズを利用したナノ多孔質膜の細孔密度の制御 国際会議

    川島 大輝, 巨 陽, 森田 康之, 徳 悠葵

    日本機械学会東海学生会第47回学生員卒業研究発表講演会  2016年3月16日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  189. 高密度電流印加がチタン合金の材料強度におよぼす影響 国際会議

    稲留 義朗, 徳 悠葵, 森田 康之, 巨 陽

    日本機械学会東海学生会第47回学生員卒業研究発表講演会  2016年3月16日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  190. 312 機械的伸縮刺激による腱細胞分化に関する1細胞計測(GS3-1 人体の力学挙動・生体計測) 国際会議

    山下 貴大, 森田 康之, 徳 悠葵, 巨 陽

    東海支部総会講演会講演論文集  2016年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  191. ストレスマイグレーションを利用したAlナノワイヤの成長に及ぼすAl薄膜構造の影響 国際会議

    鈴木 崇真, 徳 悠葵, 森田 康之, 巨 陽

    一般社団法人 日本機械学会  2016年  M&M材料力学カンファレンス

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Nanowire (NW) is one-dimensional nanostructure with the diameter in nanoscale. Currently, we can fabricate NWs made from metal, metal oxide and semiconductor which could be utilized in various applications. In our previous study, we investigated a new fabrication method of Al NWs with high growth density by stress migration. It is generally known that Al is high conductivity and inexpensive material, therefore this method for mass production of Al NWs has a big advantage. However, the mechanism of fabrication has not been clear. In this study, we investigated the effect of surface roughness and etching depth induced by focused ion beam etching on the growth density of Al NWs. As a result, we found that etching depth strongly affects the growth density of Al NWs.</p>

  192. カーボンナノチューブ複合材料の強度向上に関する実験的検討 国際会議

    笠原 龍太郎, 徳 悠葵, 森田 康之, 巨 陽

    一般社団法人 日本機械学会  2016年  年次大会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Carbon nanotube (CNT) composite materials are expected to be utilized in the field of aerospace and automobile industry due to their excellent mechanical property and relatively light weight. However, the experimental material strength measured from tensile test was much lower than the theoretical one calculated by simulation. In order to clarify the mechanism how CNT in the resin improves the material strength and increase experimental value, tensile tests and observation of fracture surface have been conducted in this research. Flaked composite material specimens with different local CNT content rates were prepared for tensile test. As a result of tensile test, we got material strength of flacked composite material specimens, which was approximately 2.5 times higher than that of only resin. By microscopic observation, we confirmed CNT pulled out from base material on fracture surface. In this research, we achieved that a higher local content rate of CNT leads to a higher experimental strength.</p>

  193. カーボンナノチューブシートを用いた水素センサーの開発 国際会議

    厳 可逸, 徳 悠葵, 森田 康之, 巨 陽

    一般社団法人 日本機械学会  2016年  機械材料・材料加工技術講演会講演論文集

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Due to their high specific surface area and measurable change in conductance according to the chemical environment changes, carbon nanotubes (CNTs) have been proved to be an ideal material for next generation of gas sensor. However, before CNTs-based sensor can become a candidate for commercial implementation, there are still challenges including mass production of sensor arrays and improvement of sensor reproducibility. In this research, a high sensitivity CNT sheet-based gas sensor was fabricated, which can push forward the commercialization of CNT-based sensor. By controlling the reaction conditions during chemical vapor deposition (CVD) process, a spinnable CNT array was synthesized reproducibly. The CNT sheets were drawn from a sidewall of spinnable CNT array. CNT sheets were directly fixed onto Au electrodes and were heated up to 300°C for 2 h to oxidize amorphous carbon. Gas detection toward hydrogen gas was operated in a quartz tube chamber. With the change of gas concentration, the change in sensor resistances as response and recovery behavior was measured using a programmable electrometer. A sensitivity of 5% for 4% H<sub>2</sub> was achieved at 200°C for pure CNT sheet and a sensitivity of 2.5% towards H<sub>2</sub> gas at room temperature was achieved by Pd functionalization.</p>

  194. Cu<sub>2</sub>O/Cuコアシェルナノ構造太陽電池のナノワイヤ密度が変換効率に与える影響 国際会議

    松尾 亮佑, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2016年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Currently, solar cells aremainlymade fromSi.However, due to the high cost and the limited resources of Si, new materials for solar cells are still needed. It has been proved that Cu<sub>2</sub>O solar cells have a high theoretical energy conversion efficiency with a very low cost. However, the actual efficiency of Cu<sub>2</sub>O solar battery is much lower than theoretical value. In this research, Cu<sub>2</sub>O/Cu core-shell NWs are fabricated on the surface of the solar cell by the AAO template method to increase light receiving area. As a result, we succeed in fabricating Cu<sub>2</sub>O/Cu core-shell NWs. The surface area of the solar cell is increased to about 151 times, which improve the solar energy conversion efficiency. And, we also find that the density of NWarrays effects the solar energy conversion efficiency.</p>

  195. 312 機械的伸縮刺激による腱細胞分化に関する1細胞計測(GS3-1 人体の力学挙動・生体計測) 国際会議

    山下 貴大, 森田 康之, 徳 悠葵, 巨 陽

    東海支部総会講演会講演論文集  2016年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  196. マイクロ波が誘起する探針―試料間原子間力による局所誘電率評価 国際会議

    趙 珉吉, 佟 博, 徳 悠葵, 森田 康之, 巨 陽

    一般社団法人 日本機械学会  2016年  M&M材料力学カンファレンス

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>With the development of nanotechnology, different types of scanning probe microscopy (SPM) have been developed to satisfy the requirement of nanotechnology. The microwave detection system is combined on the atomic force microscopy (AFM) to evaluate the electrical properties of the materials simultaneously. It is found that when microwave is applied through the probe, the microwave has interaction with the material. In this paper, the mechanism of the interaction between the microwave and material is investigated. We evaluated the probes by the microwave atomic force microscope (M-AFM) and verified our theoretical work. The result implies that the interatomic force between the tip and sample can be utilized to evaluate the permittivity of semiconductor and insulator materials.</p>

  197. 間葉系幹細胞の腱組織構築に対するひずみ依存性 国際会議

    東浦 功治, 森田 康之, 佐藤 俊博, 徳 悠葵, 巨 陽

    バイオフロンティア講演会講演論文集  2016年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  198. 薄膜残留応力を利用した被覆Alナノワイヤの自己変形 国際会議

    上田 祐志, 徳 悠葵, 森田 康之, 巨 陽

    一般社団法人 日本機械学会  2016年  年次大会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Micro/nano coils have been expected to be utilized in various applications as small inductors. Various methods have been proposed for fabricating them. Most of these methods were based on self-assembly technique such as thermal sublimation and chemical vapor deposition. In our previous study, we proposed an alternative method based on a mechanical process, where a straight nanowire is bent by depositing a thin film with a circumferentially nonuniform thickness on the nanowire. The bending is due to the misfit strain of the coated film. In order to enhance the bending, we also adopted a heat treatment that induces a creep flow only in the nanowire and thereby released the constraint of the nanowire on elastic bending due to film strain. However, the shape control of micro/nano coils such as coil pitch and direction of helical deformation was still not succeeded. In present study, we investigated the effects of film thickness and nanowire position on the coil formation during coil formation in the sputtering chamber. We achieved the shape control of micro/nano coils by varying the film thickness and nanowire position.</p>

  199. 熱疲労を受けるナノワイヤ面ファスナーの接続強度および電気的特性の評価 国際会議

    徳 悠葵, 野田 修二, 森田 康之, 巨 陽

    一般社団法人 日本機械学会  2016年  計算力学講演会講演論文集

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    記述言語:日本語   会議種別:口頭発表(一般)  

  200. 同軸構造を有するマイクロ波原子間力顕微鏡プローブの作製および評価 国際会議

    平林 貴大, 徳 悠葵, 森田 康之, 巨 陽

    一般社団法人 日本機械学会  2016年  年次大会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>With the development of nanotechnology in recent years, many researchers have focused on the fabrication of nanomaterials and nanostructures. To apply these nanomaterials and nanostructures into electronic devices, there are great needs of quantitative measurement of electrical properties of them. To satisfy these demands, we have developed the measurement instrument named microwave atomic force microscopy (M-AFM). Special probes with two unique abilities which are transmitting and radiating the microwaves were used for M-AFM. To improve these abilities, the tip of the probe was changed from slit structure to coaxial one. In this paper the new process of fabrication of coaxial structured probes were described, and the results of M-AFM measurement on the Au/GaAs sample using former slit probe and developed coaxial probe were presented. M-AFM measurement using coaxial probe obtained the clearer image of microwave responses. Results of measurements indicated coaxial probes have higher resolution in electrical properties measurement.</p>

  201. マイクロ波を用いた熱可塑性炭素繊維強化プラスチックの繊維含有率測定技術の開発 国際会議

    田所 昴, 徳 悠葵, 森田 康之, 巨 陽

    一般社団法人 日本機械学会  2016年  M&M材料力学カンファレンス

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p>Carbon fiber reinforced thermoplastic (CFRTP) has high specific strength, rigidity and corrosion proof. CFRTP is used for structural members such as aircrafts, automobiles, blades of electricgenerating windmills and sporting goods. Because the mechanical strength of CFRTP depends on the volume fraction, the evaluation of the volume fraction of CFRTP is very important in the guarantee of quality. Thus, the nondestructive inspection method to detect the volume fraction in CFRTP is required. In this paper, we measured the conductivity of CFRTP from the reflection wave of the microwave. Using a theory model, the volume fraction was evaluated from the conductivity. As a result, the potential of microwave inspection to evaluate the volume fraction in CFRTP was presented.</p>

  202. GS0705-431 コアシェルナノワイヤを用いた亜酸化銅太陽電池の作製および評価 国際会議

    松尾 亮佑, 徳 悠葵, 森田 康之, 巨 陽

    M&M材料力学カンファレンス  2015年11月21日  一般社団法人日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    Currently, the solar cells are mainly made of silicon. However, due to the high cost and shortage of silicon, new materials for solar cells are still needed. It has been proved that Cu_2O solar cells have a high theoretical energy conversion efficiency with a very low cost. However, the actual efficiency of Cu_2O solar cell is much lower than theoretical one. In this research, Cu_2O/Cu core-shell nanowires are fabricated on the surface of the solar cell by the template method to increase light receiving area. Then, elemental analysis for core-shell nanowires is carried out by Electron Energy-Loss Spectroscopy. As a result, we succeed in fabricating Cu_2O/Cu core-shell nanowires. The area of the solar cells is increased to about 220 times, which is convinced to improve the solar energy conversion efficiency.

  203. ストレスマイグレーションによる単結晶 Al ナノワイヤの高密度生成 国際会議

    鈴木 崇真, 徳 悠葵, 森田 康之, 巨 陽

    日本機械学会 M&M2015材料力学カンファレンス  2015年11月21日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  204. コアシェルナノワイヤを用いた亜酸化銅太陽電池の作製および評価 国際会議

    松尾 亮佑, 徳 悠葵, 森田 康之, 巨 陽

    日本機械学会 M&M2015材料力学カンファレンス  2015年11月21日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  205. マイクロ波を利用した熱可塑性炭素繊維強化プラスチックの繊維含有率の定量評価 国際会議

    田所昴, 徳悠葵, 森田康之, 巨陽

    日本機械学会 M&M2015材料力学カンファレンス  2015年11月21日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  206. ナノ加工プロセスによるナノワイヤ群のフック形成に関する研究 国際会議

    徳 悠葵, 草間 美香, 巨 陽

    日本機械学会機械材料・材料加工部門 第23回機械材料・材料加工技術講演会  2015年11月13日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  207. Fabrication of tiny whiskers on core-shell nanowires based on stress-induced atomic migration

    徳 悠葵, 村岡 幹夫, 巨 陽

    International multi-conference on engineering and technology innovation 2015  2015年10月30日 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Kaohsiung, Taiwan  

  208. The shape control and performance evaluation of nanowire surface fastener

    Mika KUSAMA, Yuhki TOKU, Yang JU

    The international conference on advanced technology in experimental mechanics 2015 and the 14th Asian conference on experimental mechanics  2015年10月4日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:Toyohashi, Japan  

  209. ストレスマイグレーションによる超高品質 Alナノワイヤの創製と電気的特性の評価 国際会議

    柴田 貴俊, 小島 直樹, 徳 悠葵, 巨 陽

    日本機械学会 2015年度年次大会  2015年9月13日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  210. 応力誘導法による三次元ナノ構造体の作製 国際会議

    若林 信宏, 徳 悠葵, 巨 陽

    日本機械学会 2015年度年次大会  2015年9月13日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  211. マイクロ 波原子間力顕微鏡の探針先端における原子間力の評価 国際会議

    一二三 和馬, 徳 悠葵, 巨 陽

    日本機械学会 2015年度年次大会  2015年9月13日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  212. コアシェルナノ構造を利用した原子拡散によるナノウィスカー生成に関する研究 国際会議

    徳 悠葵, 村岡 幹夫, 巨 陽

    日本機械学会 材料力学部門 若手シンポジウム2015  2015年8月10日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  213. 722 ナノ加工プロセスによるナノワイヤ群のフック形成に関する研究 国際会議

    徳 悠葵, 草間 美香, 巨 陽

    機械材料・材料加工技術講演会講演論文集  2015年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  214. OS14-6 The Shape Control and Performance Evaluation of Nanowire Surface Fastener(Semiconductor Devices and Electronic Packaging 2,OS14 Electronic and photonic packages,APPLICATIONS)

    Kusama Mika, Toku Yuhki, Ju Yang

    Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics  2015年  一般社団法人 日本機械学会

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    会議種別:口頭発表(一般)  

    CiNii Article

  215. OS14-6 The Shape Control and Performance Evaluation of Nanowire Surface Fastener(Semiconductor Devices and Electronic Packaging 2,OS14 Electronic and photonic packages,APPLICATIONS)

    Kusama Mika, Toku Yuhki, Ju Yang

    Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics  2015年  一般社団法人 日本機械学会

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    記述言語:英語   会議種別:口頭発表(一般)  

  216. OS0409-433 マイクロ波を利用した熱可塑性炭素繊維強化プラスチックの繊維含有率の定量評価 国際会議

    田所 昴, 徳 悠葵, 森田 康之, 巨 陽

    一般社団法人 日本機械学会  2015年  M&M材料力学カンファレンス

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

    Carbon fiber reinforced thermoplastic (CFRTP) has high specific strength, rigidity and corrosion proof CFRTP is used for structural members such as aircrafts, automobiles, blades of electric-generating windmills and sporting goods. Because the mechanical strength of CFRTP depends on the volume fraction, the evaluation of the volume fraction of CFRTP is very important in quality control and a guarantee of quality. Thus, the nondestructive inspection method to detect the volume fraction in CFRTP is required. In this paper, we measured the conductivity of CFRTP from the reply of the reflection wave of the microwave. And using a theory model, the volume fraction was evaluated from the conductivity. As the result, the potential of microwave inspection to evaluate the volume fraction in CFRTP was presented.

  217. OS0409-433 マイクロ波を利用した熱可塑性炭素繊維強化プラスチックの繊維含有率の定量評価 国際会議

    田所 昴, 徳 悠葵, 森田 康之, 巨 陽

    一般社団法人 日本機械学会  2015年  M&M材料力学カンファレンス

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

    Carbon fiber reinforced thermoplastic (CFRTP) has high specific strength, rigidity and corrosion proof CFRTP is used for structural members such as aircrafts, automobiles, blades of electric-generating windmills and sporting goods. Because the mechanical strength of CFRTP depends on the volume fraction, the evaluation of the volume fraction of CFRTP is very important in quality control and a guarantee of quality. Thus, the nondestructive inspection method to detect the volume fraction in CFRTP is required. In this paper, we measured the conductivity of CFRTP from the reply of the reflection wave of the microwave. And using a theory model, the volume fraction was evaluated from the conductivity. As the result, the potential of microwave inspection to evaluate the volume fraction in CFRTP was presented.

  218. J2220204 応力誘導法による3次元ナノ構造体の作製 国際会議

    若林 信宏, 徳 悠葵, 巨 陽

    年次大会  2015年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    In this study. we suggested simple and easy fabrication technique of flowe-like nanomaterials called Nano Flower (NF) by stress-induced method. From the observation of NFs grown on substrates which have different surface conditions, growth of NFs is probably related to residual stress of surface of substrates. EDS analysis results show that NFs grow up by taking in atmospheric carbon dioxide. NFs are expected as application to carbon dioxide capture and storage.

  219. J2220204 応力誘導法による3次元ナノ構造体の作製 国際会議

    若林 信宏, 徳 悠葵, 巨 陽

    年次大会  2015年  一般社団法人 日本機械学会

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

    In this study. we suggested simple and easy fabrication technique of flowe-like nanomaterials called Nano Flower (NF) by stress-induced method. From the observation of NFs grown on substrates which have different surface conditions, growth of NFs is probably related to residual stress of surface of substrates. EDS analysis results show that NFs grow up by taking in atmospheric carbon dioxide. NFs are expected as application to carbon dioxide capture and storage.

  220. J0610105 ストレスマイグレーションによる超高晶質Alナノワイヤの創製と電気的特性の評価 国際会議

    柴田 貴俊, 徳 悠葵, 巨 陽, 小島 直樹

    年次大会  2015年  一般社団法人 日本機械学会

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

    We describe the result of the electrical conductivity measurement of single crystalline aluminum nanowires. These nanowires are fabricated by simply heating the Al samples in air. The growth mechanism is stress-induced migration. Four electrodes were patterned on nanowires by the photolithographic technique and we obtained the resistivity of nanowires by four-terminal measurement. The relationship between electrical conductivity and diameter was examined experimentally.

  221. J0610105 ストレスマイグレーションによる超高晶質Alナノワイヤの創製と電気的特性の評価 国際会議

    柴田 貴俊, 徳 悠葵, 巨 陽, 小島 直樹

    年次大会  2015年  一般社団法人 日本機械学会

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

    We describe the result of the electrical conductivity measurement of single crystalline aluminum nanowires. These nanowires are fabricated by simply heating the Al samples in air. The growth mechanism is stress-induced migration. Four electrodes were patterned on nanowires by the photolithographic technique and we obtained the resistivity of nanowires by four-terminal measurement. The relationship between electrical conductivity and diameter was examined experimentally.

  222. J0610104 マイクロ波原子間力顕微鏡の探針先端における原子間力の評価に関する研究 国際会議

    一二三 和馬, 徳 悠葵, 巨 陽

    年次大会  2015年  一般社団法人 日本機械学会

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

    With the development of nanotechnology in recent years, many researchers have focused on the development of nanomaterials and nanostructures such as nanowires. To apply these nanomaterials and nanostructures into nanodevices, there are great needs of the quantitative measurement of electrical properties of materials in an infinitesimal area. Recently, it has been reported that the microwave gives an effect to an interatomic force in local area among materials. Therefore, it is thought that an identification of materials and an evaluation of electrical characteristics become possible by clarifying the relation between microwave and interatomic force. Therefore, we investigated interatomic force under the tip of probe by focusing on the force-distance curve measurement using microwave atomic force microscopy (M-AFM) as the first step. This paper describes the method and the results of the force-distance curve measurement on the sample of Au, Si, and glass. Results of this experiment indicate actually that the effect of microwave is large in material which has high electric conductivity.

  223. J0610104 マイクロ波原子間力顕微鏡の探針先端における原子間力の評価に関する研究 国際会議

    一二三 和馬, 徳 悠葵, 巨 陽

    年次大会  2015年  一般社団法人 日本機械学会

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

    With the development of nanotechnology in recent years, many researchers have focused on the development of nanomaterials and nanostructures such as nanowires. To apply these nanomaterials and nanostructures into nanodevices, there are great needs of the quantitative measurement of electrical properties of materials in an infinitesimal area. Recently, it has been reported that the microwave gives an effect to an interatomic force in local area among materials. Therefore, it is thought that an identification of materials and an evaluation of electrical characteristics become possible by clarifying the relation between microwave and interatomic force. Therefore, we investigated interatomic force under the tip of probe by focusing on the force-distance curve measurement using microwave atomic force microscopy (M-AFM) as the first step. This paper describes the method and the results of the force-distance curve measurement on the sample of Au, Si, and glass. Results of this experiment indicate actually that the effect of microwave is large in material which has high electric conductivity.

  224. GS0706-432 ストレスマイグレーションによる単結晶Alナノワイヤの高密度生成 国際会議

    鈴木 崇真, 徳 悠葵, 森田 康之, 巨 陽

    一般社団法人 日本機械学会  2015年  M&M材料力学カンファレンス

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

    Nanowires have been expected to be utilized in various applications. Recently, many researchers have reported about single crystal or polycrystalline nanowires where the single crystal nanowires are shown to have a higher conductivity compared to the polycrystalline ones. In our previous study, we investigated the fabrication process of single crystal nanowires by stress migration. However, because the mechanism of fabrication was not clear, the generation density of single crystal nanowires was low for this method. In this study, we suggested a new method to increase the generation density of single crystal nanowires. An etching process was added to the previous fabrication method and the conditions of the substrate surface were changed. By doing this, the stress generated around the concentrated Al atoms was larger than the threshold stress needed to fabricate the nanowires. As a result of the added etching process, we achieved a nanowire generation density 100 times that of the conventional fabrication method.

  225. GS0706-432 ストレスマイグレーションによる単結晶Alナノワイヤの高密度生成 国際会議

    鈴木 崇真, 徳 悠葵, 森田 康之, 巨 陽

    一般社団法人 日本機械学会  2015年  M&M材料力学カンファレンス

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

    Nanowires have been expected to be utilized in various applications. Recently, many researchers have reported about single crystal or polycrystalline nanowires where the single crystal nanowires are shown to have a higher conductivity compared to the polycrystalline ones. In our previous study, we investigated the fabrication process of single crystal nanowires by stress migration. However, because the mechanism of fabrication was not clear, the generation density of single crystal nanowires was low for this method. In this study, we suggested a new method to increase the generation density of single crystal nanowires. An etching process was added to the previous fabrication method and the conditions of the substrate surface were changed. By doing this, the stress generated around the concentrated Al atoms was larger than the threshold stress needed to fabricate the nanowires. As a result of the added etching process, we achieved a nanowire generation density 100 times that of the conventional fabrication method.

  226. F041003 機能性ナノワイヤ面ファスナーの創製 国際会議

    巨 陽, 徳 悠葵

    一般社団法人 日本機械学会  2015年  年次大会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    Mass production of surface mount devices (SMDs) relies heavily on reflow soldering and has become the cornerstone of today's electronic industry. However, the traditional reflow soldering technique is characterized by high heating temperatures, toxic solder materials and low recycling rate of SMDs. Here, we introduce a new patterned structure of nanowire arrays named a surface fastener through which cold bonding for surface mount technology can be realized. The mechanical bonding enables normal and shear bonding strengths of more than 5 N/cm^2. Simultaneously, the parasitic resistance of a pair of surface fasteners is only approximately 2Ω. The present technique can be performed at room temperature, thereby improving the process compatibility and reliability of SMDs. Surface fasteners based on high melting point metallic nanowires are temperature-resistant for many critical applications. In addition, bonding without solder material is positive for the recycling of rare metals in SMDs.

  227. F041003 機能性ナノワイヤ面ファスナーの創製 国際会議

    巨 陽, 徳 悠葵

    一般社団法人 日本機械学会  2015年  年次大会

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

    Mass production of surface mount devices (SMDs) relies heavily on reflow soldering and has become the cornerstone of today's electronic industry. However, the traditional reflow soldering technique is characterized by high heating temperatures, toxic solder materials and low recycling rate of SMDs. Here, we introduce a new patterned structure of nanowire arrays named a surface fastener through which cold bonding for surface mount technology can be realized. The mechanical bonding enables normal and shear bonding strengths of more than 5 N/cm^2. Simultaneously, the parasitic resistance of a pair of surface fasteners is only approximately 2Ω. The present technique can be performed at room temperature, thereby improving the process compatibility and reliability of SMDs. Surface fasteners based on high melting point metallic nanowires are temperature-resistant for many critical applications. In addition, bonding without solder material is positive for the recycling of rare metals in SMDs.

  228. 722 ナノ加工プロセスによるナノワイヤ群のフック形成に関する研究 国際会議

    徳 悠葵, 草間 美香, 巨 陽

    機械材料・材料加工技術講演会講演論文集  2015年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  229. 金属被覆により生じるナノワイヤの曲げ変形に関する理論解析 国際会議

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会  2014年7月19日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  230. OS1507 金属被覆により生じるナノワイヤの曲げ変形に関する理論解析 国際会議

    徳 悠葵, 村岡 幹夫

    M&M材料力学カンファレンス  2014年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    In this study, we discussed about the effect of film thickness on bending deformation of coated nanowire (NW). The three dimensional theoretical model for analyzing the effect was proposed in this paper. The dependence of the misfit strain on the film thickness was introduced in the model. We concluded that bending direction of the NW varied with increasing the coating film thickness. This result arises from the dependence of the misfit strain on the film thickness and the nonuniform film thickness along the circumference of the NW.

  231. 金属被覆ナノワイヤの通電による形態変化の観察 国際会議

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会  2013年11月8日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  232. 211 コア流動法によるナノコイル形成に関する理論的検討(材料力学III) 国際会議

    工藤 隆祐, 徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会  2013年9月20日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  233. コア流動法により作製した金属被覆マイクロコイルの発生磁場評価 国際会議

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会  2013年9月8日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  234. 511 金属被覆ナノワイヤの通電による形態変化の観察 国際会議

    徳 悠葵, 村岡 幹夫

    機械材料・材料加工技術講演会講演論文集  2013年  一般社団法人 日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

  235. 330 コア還元による薄膜の残留応力解放を利用した金属被覆ナノワイヤの微小コイル形成 国際会議

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会  2012年11月30日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  236. 振動慣性力を利用したナノワイヤの付着力制御 国際会議

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会  2012年8月11日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  237. Manipulation of Nanowires by Chopsticks

    Kohtaro KOBAYASHI, Yuhki TOKU, Mikio MURAOKA

    International Conference on Advanced Technology in Experimental Mechanics 2011  2011年9月19日 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Kobe, Japan  

  238. Effect of Film Thickness on Helical Formation of Coated Nanowires in an Enhanced-Bending Technique

    Yuhki TOKU, Mikio MURAOKA

    JSME/ASME 2011 International conference on materials & processing  2011年6月13日 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Oregon, USA  

  239. OS06-2-4 Manipulation of Nanowires by Chopsticks

    Kobayashi Kohtaro, Toku Yuhki, Muraoka Mikio

    Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics  2011年  一般社団法人 日本機械学会

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    記述言語:英語   会議種別:口頭発表(一般)  

  240. Enhanced Bending of Coated Nanowires Using Viscous Flow of Core Material: Production of Nanoinductance

    Yuhki TOKU, Mikio MURAOKA

    12th International Conference on Electronics Materials and Packaging  2010年10月25日 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Singapore, Singapore  

  241. 002 製膜ひずみとコア流動を利用した金属被覆ナノワイヤの曲げ加工(GS1-1 一般セッション) 国際会議

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会  2010年10月9日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    Various methods have been proposed for fabricating nanocoils in order to extend the range of elements for building nanodevices. Most of these methods are based on self-assembly technique. We have previously demonstrated an alternative method in which a straight nanowire is bent by depositing a thin film on the nanowire. The bending is due to the misfit strain of the coated film. However, nanocoil formation using this method is highly inefficient. In this study, we developed an advanced method in which the helical formation of coated nanowires takes place because of the viscous flow of the core material, i.e., the nanowires, and the misfit strain of the coating film. When the melting temperature of the nanowire material is lower than that of the coating, elevating the temperature induces a viscous flow, i.e., creep, which only occurs in the nanowire. The creep releases the constraint of the nanowire on elastic bending due to film strain.

  242. 製膜ひずみとコア流動を利用した金属被覆ナノワイヤの曲げ加工 国際会議

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会  2010年10月9日 

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

  243. T0301-1-4 コア流動法によるナノコイル形成の曲率制御([T0301-1]金属ナノ材料の創製と展開(1)) 国際会議

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会  2010年9月4日 

     詳細を見る

    記述言語:日本語   会議種別:口頭発表(一般)  

    Various methods have been proposed for fabricating nanocoils in order to extend the range of elements for building nanodevices. Most of these methods are based on self-assembly technique. We have previously demonstrated an alternative method in which a straight nanowire is bent by depositing a thin film on the nanowire. The bending is due to the misfit strain of the coated film. However, nanocoil formation using this method is highly inefficient. In this study, we developed an advanced method in which the helical formation of coated nanowires takes place because of the viscous flow of the core material, i.e., the nanowires, and the misfit strain of the coating film. When the melting temperature of the nanowire material is lower than that of the coating, elevating the temperature induces a viscous flow, i.e., creep, which only occurs in the nanowire. The creep releases the constraint of the nanowire on elastic bending due to film strain.

  244. 104 コア流動による金属被覆ナノワイヤのコイル形成(学生賞I,一般講演) 国際会議

    徳 悠葵, 村岡 幹夫

    一般社団法人日本機械学会  2010年3月12日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

  245. ナノワイヤの真性ひずみ誘起曲げ加工条件の実験的検討 国際会議

    徳 悠葵, 村岡 幹夫

    精密工学会東北支部学術講演会  2009年11月28日 

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    記述言語:日本語   会議種別:口頭発表(一般)  

▼全件表示

共同研究・競争的資金等の研究課題 6

  1. 周期的電子風力を利用した原子再配列法の開拓

    研究課題番号:20352230  2021年4月 - 2027年3月

    創発的研究支援事業 

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    担当区分:研究代表者  資金種別:競争的資金

  2. コアシェルナノ構造を利用した応力誘導による超微細ナノウィスカーの創製に関する研究

    2016年4月 - 2017年3月

    豊田理研スカラー  

      詳細を見る

    資金種別:競争的資金

  3. 薄膜残留応力を利用した金属被覆ナノワイヤの芯付ナノコイル形成とその応用

    2016年4月 - 2017年3月

    池谷科学技術振興財団 単年度研究助成 

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    資金種別:競争的資金

  4. 不均一被覆の残留膜ひずみを利用したナノベルトのゼンマイ形成

    2015年10月 - 2016年9月

    大澤科学技術振興財団による研究助成 

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    資金種別:競争的資金

  5. 不均一製膜による偏心膜ひずみを利用した金属被覆ナノベルトのゼンマイ形成に関する研究

    2015年4月 - 2016年3月

    日本板硝子材料工学助成会研究助成 

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    資金種別:競争的資金

  6. コア流動法を利用したナノワイヤ巻付け加工に関する研究

    2015年4月 - 2016年3月

    東京工業大学基金による研究助成 

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    資金種別:競争的資金

▼全件表示

科研費 9

  1. 周期的電子風力を利用した原子再配列法の開拓

    2021年4月 - 2028年3月

    国立研究開発法人科学技術振興機構  創発的研究支援事業 

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    担当区分:研究代表者 

  2. 電子風力による金属材料のナノスケール組織制御と機構解明

    研究課題/研究課題番号:20K20531  2020年7月 - 2023年3月

    日本学術振興会  科学研究費助成事業  挑戦的研究(開拓)

    巨 陽, 徳 悠葵, 木村 康裕

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    担当区分:研究分担者 

    集団的な電子の衝撃力を電子風力として操作することにより金属原子に能動的に作用し、金属材料内原子配列の最適化や転位の移動・消滅などのナノスケール力学制御を実現することを目的としている。これによって、高密度電流による金属材料内の結晶構造、相組織などミクロスケールの組織制御を実現し、これまで両立困難であった金属材料の高強度と高延性や、高強度と高靭性などの力学特性のトレードオフを打破し、高強度、高延性、高靭性を同時に実現できる革新的力学特性を発現させる。さらに、これらの現象を明らかにすることにより、電子風力による金属材料内原子配列の最適化、そして組織制御に関する新しい原理を世界に先駆けて提案する。

  3. 多層金属ナノ構造を利用した応力誘導原子拡散による極小単結晶ナノウィスカーの創製

    研究課題/研究課題番号:20K20959  2020年7月 - 2022年3月

    日本学術振興会  科学研究費助成事業  挑戦的研究(萌芽)

    徳 悠葵, 木村 康裕

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    担当区分:研究代表者 

    配分額:6370000円 ( 直接経費:4900000円 、 間接経費:1470000円 )

    本研究では,独自のコアシェル型ナノチューブの作製手法を利用し,極小の単結晶銅ナノウィスカーを創製する.極小ナノウィスカーは粒子状と異なり,高アスペクト比かつ大きな結晶露出面積を持つ新たなCO2分解触媒として期待できる.ウィスカーの創製原理は,外皮金属により密閉した空間に加熱還元された金属が析出する際,線膨張係数の差により還元金属中に圧縮応力が生ずる.このとき還元金属の原子拡散が誘起され,外皮の格子欠陥・結晶粒界を拡散した還元金属原子がウィスカー状に析出する.応力による原子拡散により創製したナノウィスカーはほぼ単結晶であり,副反応の少ないCO2の分解触媒へと応用できる.

  4. 高周波高密度電流が原子配列に与える「揺さぶり」を利用した自己原子再配列技術の創出

    研究課題/研究課題番号:20H02025  2020年4月 - 2023年3月

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    徳 悠葵, 巨 陽

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    担当区分:研究代表者 

    配分額:17940000円 ( 直接経費:13800000円 、 間接経費:4140000円 )

    本研究では,金属薄膜を対象に,熱処理に依らない高周波高密度電流による原子の再配列を世界で初めて実現する.これは,電子と原子の力学的相互作用,すなわち電子風力を原子配列の「揺さぶり」として利用することにより,自発的に原子を安定位置へと再配列させる極めて独創的な手法である.これにより,結晶方位の整列,結晶粒の増大,最密結晶面の増加,点・線欠陥の消滅を誘起し,薄膜の応用上重要な密着性・導電性といった機械特性・電気特性の向上を実現する.さらに,高周波高密度電流がなす原子の駆動現象のメカニズムを解明し,熱処理に依らない新たな電子風力を基盤とした原子配列・結晶構造の制御法として学理構築を目指す.

  5. 薄膜残留応力によるナノベルトの自己変形を利用したゼンマイ型ナノ構造体の創製と応用

    研究課題/研究課題番号:18K13657  2018年4月 - 2020年3月

    若手研究

    徳 悠葵

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    担当区分:研究代表者 

    配分額:4160000円 ( 直接経費:3200000円 、 間接経費:960000円 )

    本研究では独自に提案した金属被覆ナノワイヤの自己らせん変形技術を発展させ,薄膜残留応力の分布を制御することにより,金属被覆ナノベルトに自己変形を発現させ,ナノゼンマイの創製を実現した.まず,コア材料であるSnO2ナノベルトの各種寸法が熱昇華時の炉内圧力に大きく依存することを明らかにし,断面アスペクト比の制御を実現した.これにより,ゼンマイ形成に最適な形状のナノベルトを創製し,直線状のナノベルトから長手方向に曲率が変化するナノ構造体すなわちナノゼンマイの創製に成功した.さらに,当初未計画であったナノベルトの高感度ガスセンサへの応用も図り.ガス検出に有意な結晶面の存在を確認した.
    本研究では,独自の金属被覆ナノワイヤの自己らせん変形技術「コア流動法」を展開し,ナノベルトのゼンマイ形成を実現した.ゼンマイ形状には力学的エネルギーを高効率・高密度に貯蔵できる特長があり,直接動作としてエネルギーを利用できることから,ナノスケールのエネルギー貯蔵形態として期待できる.我々が普段身近に扱っている電池などは構造が複雑であるため微小化することが困難であり,将来的にはマイクロ・ナノマシンの動力源問題が浮上すると考えられる.本研究はこのような問題に対する解決手段として世界に先駆けた提案であり,将来性・波及効果は大きい.

  6. 革新的応力場制御による高秩序ナノ空間構造体の創製と展開

    研究課題/研究課題番号:17H06146  2017年5月 - 2022年3月

    日本学術振興会  科学研究費助成事業  基盤研究(S)

    巨 陽, 細井 厚志, 徳 悠葵, 木村 康裕, 森田 康之

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    担当区分:研究分担者  資金種別:競争的資金

    1.半導体ナノ構造体の生成機構の解明
    比較的低い加熱温度で形成した厚い表面酸化膜の下に蓄積された大きな駆動応力により、大量の金属原子が一気に酸化膜ウイークポイントから放出されること、そして形成されたナノ構造体表面における酸化物の原子配列密度が低いことから、内部の金属原子が表面に拡散されることが金属酸化物ナノ構造体の生成・形状に影響する要因であることを分子動力学シミュレーションにより明らかにした。また、ナノ構造体の高密度成長の発生機構は、金属薄膜の表面において引張応力が働いていることによって、原子の低密度化により金属原子の拡散が促進され、遷移できる原子の個数が多いであることを突き止めた。
    2.フレキシブル透明導電膜の作製
    フレキシブル基板上に粘着性薄膜をコーティングし、Al/Si基板上に作製した高密度単結晶Alナノワイヤアレイをフレキシブル基板上に転写し、保護薄膜を蒸着することにより、高強度、高導電性のフレキシブル透明導電膜を実現した。
    3.フレキシブル透明導電膜の最適化
    ナノワイヤの直径、長さ、密度が透明導電膜の強度、導電性、透光性に及ぼす影響を実験的に明らかにした。さらに、ナノワイヤの直径、長さ、密度を最適化したナノワイヤアレイにより、電気抵抗率:396 Ω/sq、光透過率:87.0%の金属ナノワイヤフレキシブル透明導電膜の創製を実現した。
    これまで予定されていた研究計画は順調に実施されており、高密度かつ高品質なAlナノワイヤアレイおよびCu2Oナノフラワーの創製に成功した。また、金属ナノワイヤおよび半導体ナノ構造体の成長に関する応力場の解析や成長メカニズムの解明にも着実な成果を挙げている。さらに、高密度単結晶Alナノワイヤアレイを用いた透明導電膜の創製にも実現した。一方、応力酸化誘導法を更に発展させ、高秩序、高品質、高密度のFe2O3ナノワイヤアレイの創製に成功した。また、転位、結晶粒界も金属・半導体ナノ構造体の成長に影響を及ぼしていることを突き止め、今後の更なる実験的かつ理論的な解析により、ナノ構造体の新しい成長メカニズムを世界に先駆けて提案することが期待できる。さらに、当初の目標を超え、Cu2Oナノ構造体およびFe2O3ナノワイヤアレイを太陽光水素製造に応用し、それぞれ世界最高レベルの変換効率を達成した。特に、応力場制御によりFe2O3ナノワイヤのα相の高純度化を実現することにより、高い変換効率かつ高い耐久性を有する太陽光水分解水素製造素子を実現し、今後の更なる高性能かつ低コスト、実用化の早期実現が見込まれる。
    (Ⅰ)転位・結晶粒界が原子拡散に及ぼす影響の解明
    超高分解能TEMを用いて、Al薄膜におけるナノワイヤ成長領域内外、成長前後、表界面の結晶構造や原子配列の実験的解析を行い、原子スケールでの薄膜の結晶性状とナノワイヤ成長の因果関係を解明する。また、分子動力学シミュレーションにより、応力場における転位や、結晶粒界などが原子の拡散やナノワイヤ成長に及ぼす影響を明らかにする。最終的に実験および理論的な解析を融合することにより、金属ナノワイヤが高密度成長できるメカニズムを新たに解明する。
    (Ⅱ)透明導電膜の低コスト大面積製作の実現
    Al/Si基板の裏面に熱膨張係数がSiより低い材料をコーティングし、その厚さを最適化することにより、加熱時にAl薄膜の全面にナノワイヤの高密度成長に必要な応力場を形成する。また、原子の拡散速度や拡散経路を増やすため、Al薄膜を形成する際に酸素原子の導入を試みる。さらに、Al薄膜の厚さ方向に大きな原子拡散駆動力の制御を実現するため、Al 薄膜とSi基板間にCr中間層を導入し、その厚さの最適化を行う。最終的にに、Alナノワイヤアレイの大面積成長およびフレキシブル透明導電膜の低コスト製作手法を確立する。
    (Ⅲ)半導体3次元空間構造体の創製
    作製した高密度Cu2Oナノ構造体をCNTシートにより担持し、多層構造を実現することにより、高い受光面積を有する3次元ナノ空間構造体配列の創製を実現する。また、3次元ナノ空間構造体配列の吸光効果を解析し、エネルギー変換素子としてのバンドギャップを評価する。さらに、実際にCu2O半導体と電解質水溶液で形成されているショットキーバリアの高さや空乏層幅を算出する。これらの解析結果により、3次元ナノ空間構造体配列の形状、密度、空間空隙の最適化を行い、超高変換効率を実現した太陽光水分解水素製造素子を開発する。

  7. 次世代エレクトロニクス実装ナノワイヤ面ファスナーの高強度化・高機能化

    研究課題/研究課題番号:17H01236  2017年4月 - 2018年3月

    巨 陽

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    担当区分:研究分担者 

    本研究は、ナノワイヤにコーティングした金属薄膜の残留応力を制御することによりナノワイヤの機械的な永久曲げ変形を実現し、ナノワイヤのフック&ループ構造を有したこれまでにない電気伝導ナノワイヤ面ファスナーを創出する。さらに、ナノワイヤのフック&ループ構造により発現する力学現象を解明し、常温での電気伝導接合技術を確立する。ナノワイヤ面ファスナーの接合強度、電気伝導および熱伝導の極限に挑戦することにより、従来のはんだ実装技術では成し得ないパワーデバイスの高温環境下での使用やフレキシブル基板への接続などを可能にする次世代エレクトロニクス実装技術を開発する。
    本年度は以下の実績を得た。
    (Ⅰ-1)超低密度ポーラスアルミナの開発
    細孔の大きさおよび孔間の間隙を広範囲で制御可能な独創的な二段階陽極酸化プロセスを新たに開発し、いままでは実現困難であったポーラスアルミナの低密度化を行った。第一段階の陽極酸化では、陽極酸化においてくぼみ形成の前処理を行うことによって細孔の数や間隔のコントロールを実現した。このプロセスでは、従来使用されているシュウ酸、硫酸ではなく、大きなセルが形成可能なリン酸を使用し、高電圧硬質陽極酸化を実現することにより、大きな細孔間隔を確保する。大きなセルを得るための第一段階の陽極酸化では、形成される細孔も大きいため、液温60 ℃のリン酸クロム水溶液で1時間ウェットエッチングを行い、第一段階の陽極酸化でアルミニウム箔上に形成されたポーラスアルミナのみを除去した。その後、小さな細孔が形成できる硫酸を用いて、第二段階の陽極酸化を行った。新たに開発した二段階陽極酸化法により、第一段階でできたくぼみを起点として細孔が成長することによって、低密度ポーラスアルミナの作製を実現した。
    29年度が最終年度であるため、記入しない。
    29年度が最終年度であるため、記入しない。

  8. 自己変形発現によるナノワイヤ加工法を利用した芯付ナノコイルの創製と応用

    研究課題/研究課題番号:16K21093  2016年4月 - 2018年3月

    徳 悠葵

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    担当区分:研究代表者 

    配分額:4160000円 ( 直接経費:3200000円 、 間接経費:960000円 )

    本研究では,ナノスケールの電磁気素子実現を目的に,金属被覆ナノワイヤの自己螺旋形成による導電性ナノコイル探針の開発を行った.被覆方法の検討によりコイルの形状制御を行い,コイルピッチの制御を実現した.また,創製したコイルは電磁気特性評価において同等スケールの微小コイルに比べ100倍程度高い導電率を実現し,理論的解析により軟磁性ナノ材料の磁気制御が可能な発生磁場を示した.さらに,原子間力顕微鏡用カンチレバーの探針にナノワイヤを自己螺旋変形させることに成功し,原子間力顕微鏡とナノ電磁石を融合した新規のナノ材料評価素子としての可能性を示した.

  9. 自己変形発現によるナノコイル形成技術を利用したナノインダクタ探針の開発

    2013年4月 - 2015年3月

    科学研究費補助金 

    徳 悠葵

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    担当区分:研究代表者 

▼全件表示

 

担当経験のある科目 (本学) 24

  1. 材料科学第1

    2020

  2. 設計基礎論

    2020

  3. 機械・航空宇宙システム研修

    2020

  4. 機械・航空宇宙工学序論

    2020

  5. 材料強度・評価学特別実験及び演習B

    2020

  6. 材料強度・評価学特別実験及び演習A

    2020

  7. 破壊強度学特論

    2020

  8. 破壊強度学特論

    2019

  9. 設計基礎論B

    2019

  10. 機械・航空宇宙工学序論

    2019

  11. 材料科学第1A

    2019

  12. 材料力学第1及び演習

    2018

  13. Automobile Engineering Laboratory Ⅱ

    2018

  14. 機械・航空工学科実験第1・第2

    2018

  15. 設計基礎論B

    2018

  16. 材料力学及び演習

    2017

  17. 機械・航空工学科実験第1・第2

    2017

  18. Automobile Engineering Laboratory Ⅱ

    2017

  19. 機械・航空工学科実験第1・第2

    2016

  20. Automobile Engineering Laboratory Ⅱ

    2016

  21. 材料力学及び演習

    2016

  22. 機械・航空工学科実験第1・第2

    2015

  23. Automobile Engineering Laboratory Ⅱ

    2015

  24. 物理学実験

    2015

▼全件表示

担当経験のある科目 (本学以外) 15

  1. 材料力学及び演習

    名古屋大学)

  2. 設計基礎論B

    名古屋大学)

  3. 破壊強度学特論

    名古屋大学)

  4. 機械・航空工学科実験第1・第2

    名古屋大学)

  5. 機械・航空工学科実験第1・第2

    名古屋大学)

  6. 機械・航空宇宙工学序論

    名古屋大学)

  7. 機械・航空宇宙工学序論

    名古屋大学)

  8. 材料科学第1A

    名古屋大学)

  9. 材料科学第1A

    名古屋大学)

  10. 材料力学第1及び演習

    名古屋大学)

  11. 材料力学及び演習

    名古屋大学)

  12. Automobile Engineering Laboratory Ⅱ

    名古屋大学)

  13. Automobile Engineering Laboratory Ⅱ

    Nagoya University)

  14. Automobile Engineering Laboratory Ⅱ

    Nagoya University)

  15. Automobile Engineering Laboratory Ⅱ

    名古屋大学)

▼全件表示