研究者詳細 - 山本　徹也

論文 - 山本　徹也

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Decomposing Oil-Soluble Initiators in Particles: A Template-Free Method for the Preparation of Hollow Polymer and Silica Particles 査読有り

T. Yamamoto, and K. Tsutsumi

ACS Omega 6 巻 ( 47 ) 頁： 31677 - 31682 2021年11月

Size Control of Polystyrene Nanoparticles Synthesized in Melamine Foam 査読有り

Shinya Ouchi, Naoki Yamada, Tetsuya Yamamoto

Industrial & Engineering Chemistry Research 59 巻 ( 40 ) 頁： 17927 - 17933 2020年10月

Enhancement of bending strength, thermal stability and recyclability of carbon-fiber-reinforced thermoplastics by using silica colloids 査読有り

Tetsuya Yamamoto, Sho Yabushita, Toshihira Irisawa, Yasuhiro Tanabe

Composites Science and Technology 181 巻頁： 107665 - 107665 2019年9月

A polymer colloidal technique for enhancing bending properties of carbon fiber-reinforced thermoplastics using nylon modifier 査読有り

Tetsuya Yamamoto, Katsumasa Uematsu, Toshihira Irisawa, Yasuhiro Tanabe

Composites Part A: Applied Science and Manufacturing 112 巻頁： 250 - 254 2018年9月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier Ltd

To enhance the bending properties of carbon fiber-reinforced thermoplastics (CFRTPs) by improving their interfacial properties, a new colloidal technique has been developed in this work. First, colloidal polymer containing the main components of thermoplastic nylon resin was synthesized from nylon powder and surfactants or through emulsion polymerization and then subsequently adsorbed on the surface of carbon fibers by electrodeposition. The strength of the surface adhesion between the modified carbon fibers and nylon was estimated by measuring their interfacial shear strength (ISS) via fragmentation testing. The obtained results revealed that both the ISS and impregnation ratio of nylon depended on the amount and composition of the adsorbed particles. Furthermore, the relationship between the interfacial and bending properties of CFRTP was clarified. The data by three-point bending tests showed that the contribution of the impregnation ratio of nylon to the enhancement of the bending strength of CFRTP was much larger than that of ISS.

DOI： 10.1016/j.compositesa.2018.06.011

Web of Science

Scopus

Size Control of Polymeric Particle in Soap-Free Emulsion Polymerization 招待有り査読有り

Tetsuya Yamamoto, Ko Higashitani

KONA Powder and Particle Journal 35 巻 ( 0 ) 頁： 66 - 79 2018年

Growth mechanism of soap-free polymerization of styrene investigated by AFM 査読有り

Yamamoto, T Nakayama, M Kanda, Y Higashitani, K

Journal of Colloid and Interface Science 297 巻 ( 1 ) 頁： 112-121 2006年5月

Environmental-friendly extraction of di(2-ethylhexyl) phthalate from poly(vinyl chloride) using liquefied dimethyl ether 招待有り国際共著

Wang, T., H. Kanda, K. Kusumi, L. Mei, L. Zhang, H. Machida, K. Norinaga, T. Yamamoto, H. Sekikawa, K. Yasui, L. Zhu

Waste Management 2024年7月

High-Efficiency Polymerization for Synthesizing Polymer Nanoparticles in Melamine Foam Using Ultraviolet Irradiation 査読有り

Yamamoto, T; Morikawa, H

ACS OMEGA 9 巻 ( 5 ) 頁： 5273 - 5277 2024年1月

Hollow Particles Synthesized by Water-soluble and Oil-Soluble Initiators and the Mechanism of Incorporating an Oil-Soluble Initiator 査読有り

Tetsuya Yamamoto, Shinya Maeda, Mitsuo Hara

Results in Materials 19 巻頁： 1004221 2023年9月

コア-シリカシェル間にすき間構造をもつ複合微粒子の合成と吸着剤への応用

山本徹也

(公財)日本板硝子材料工学助成会成果報告書 41 巻頁： 234 - 241 2023年7月

Synthesis of polymer nanoparticles using methylcellulose gel as reactor 招待有り査読有り

T. Yamamoto

Journal of Biological Macromolecules 23 巻 ( 2 ) 頁： 37 - 45 2023年7月

高分子微粒子成長過程のin-situ観察と微生物毒性招待有り

山本徹也

粉体工学会誌 60 巻 ( 6 ) 頁： 341 - 347 2023年6月

In-situ観察法によるポリマー微粒子の生成と成長過程のメカニズム招待有り

山本徹也

粉体工学会誌 60 巻 ( 4 ) 頁： 221 - 227 2023年4月

カーボンナノチューブを表面修飾に利用した炭素繊維強化プラスチック招待有り

山本徹也

化学工学誌 87 巻 ( 1 ) 頁： 47 - 47 2023年1月

Enhancement of Surface Adhesion between Carbon Fiber and Thermoplastic Using Polymer Colloid Dispersed in n-Butanol 査読有り

Yamamoto, T.*, and S. Yabushita,

Results in Materials 16 巻頁： 100322 - 100322 2022年12月

Green Synthesis of Hollow Structures Through the Decomposition of Azo Compounds Incorporated Inside Polystyrene Particles 査読有り

T. Yamamoto, K. Tsutsumi, S. Maeda

ACS Omega 7 巻 ( 32 ) 頁： 28556 - 28560 2022年8月

Nanosizing of Polymeric Particles by Suppressing Growth via Heterocoagulation using a 3D Micro-Network Reactor 査読有り

S. Ouchi, H. Morikawa, M. Hara, and T. Yamamoto

Powder Technology 405 巻頁： 117530 2022年6月

Structural Design to Enhance Mechanical Properties of Carbon-Fiber-Reinforced Thermoplastics using Colloidal Particles and Soft and Hard Resins 査読有り

K. Kira, SulChan Kim, T. Yamamoto, K. Kato, M. Nomura

Composites Part C 6 巻頁： 100211 2021年12月

Stress graphitization behavior of c/c composites fabricated from milled short pitch-based carbon fibers and their electrical properties 査読有り

T. Irisawa, K. Nishimura, T. Yamamoto, Y. Tanabe, and n. Iwashita

Journal of Fiber Science and Technology 77 巻 ( 11 ) 頁： 296 - 304 2021年11月

Use of Hollow Colloids for Generating Nanovoids to Mitigate the Brittle Fracture of Carbon Fiber-Reinforced Thermoplastics 査読有り

Tetsuya Yamamoto, Yugo Terada

Composites Part A: Applied Science and Manufacturing 146 巻頁： 106506 2021年10月

三次元網目構造を反応場とした高分子ナノ粒子のサイズコントロール招待有り査読有り

大内慎也，山田尚輝，山本徹也

粉体工学会誌 58 巻 ( 9 ) 頁： 481 - 485 2021年9月

Synthesis of activated carbon using bagasse and recycled carbon fibers 招待有り査読有り

T. Yamamoto, Y. Makino, T. Irisawa

Chemical Engineering & Technology 44 巻 ( 9 ) 頁： 1618 - 1622 2021年9月

安全な破壊を実現する高強度CFRTPの開発

山本徹也

材料化学研究助成研究成果報告 34 巻頁： 49 - 53 2021年7月

CFRPから回収した炭素繊維を利用した高機能性材料の開発

山本徹也

ホソカワ粉体工学振興財団年報 28 巻頁： 103 - 108 2021年5月

Surfactant-free decellularization of porcine aortic tissue by subcritical dimethyl ether 査読有り国際共著

Kanda Hideki, Ando Daigo, Hoshino Rintaro, Yamamoto Tetsuya, Wahyudiono, Suzuki Shogo, Shinohara Satoshi, Goto, Motonobu

ACS Omega 6 巻 ( 20 ) 頁： 13417 - 13425 2021年5月

熱可逆性ハイドロゲルを重合場としたポリスチレンナノ粒子の合成査読有り

山田尚輝、大内慎也、山本徹也

化学工学論文集 47 巻 ( 1 ) 頁： 11 - 16 2021年1月

Dispersion of Nano-materials in Polymer Composite Materials 査読有り国際共著

Tetsuya Yamamoto, Yuya Takahashi, Naoya Toyoda

MATEC Web of Conferences 333 巻頁： 11003 - 11003 2021年1月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：{EDP} Sciences

Polymer composites materials are the subject of extensive studies because of their novel properties compared with their constituent materials. Dispersion stability of sub-micron sized particles in the medium is important from the point of colloidal views. In the present study, dispersion of nano-materials in the matrix polymer is one of the most important problems to enhance their mechanical properties. We tackled this problem to carry out surface modification of the nano-materials, such as carbon nano tubes (CNTs), using amphiphilic polymers, poly<italic>N</italic>vinylacetamide (PNVA), synthesized thorough radical polymerization. Hydrogen bond worked between PNVA onto the modified nano-materials and hydrophilic matrix, such as polyvinyl alcohol (PVA), to enhance surface adhesions and dispersions of the nano-materials in the matrix. As a result, the mechanical properties of their composites materials were strengthened. When CNTs were used in PVA, the transparency of the composite was also increased due to improvement of their dispersions. In addition, if the CNTs formed the networks in the composites, the highly conductive and transparent polymer composite films were fabricated.

DOI： 10.1051/matecconf/202133311003

Creating a laminated carbon fiber-reinforced thermoplastic using polypropylene and nylon with a polypropylene colloid 査読有り

Tetsuya Yamamoto, Yusuke Ota

Composite Structures 255 巻頁： 113038 - 113038 2021年1月

Effects of carbon nanofibers on carbon fiber reinforced thermoplastics made with in situ polymerizable polyamide 6 査読有り

Toshihira Irisawa, Masataka Shibata, Tetsuya Yamamoto, Yasuhiro Tanabe

Composites Part A: Applied Science and Manufacturing 138 巻頁： 106051 - 106051 2020年11月

高分子中空微粒子の炭素化による多孔質炭素中空微粒子の合成招待有り査読有り

河合優介, 山本徹也

粉体工学会誌 57 巻 ( 8 ) 頁： 412 - 416 2020年8月

Making hollows using nitrogen gas emitted by the decomposition of VAm-110 in polystyrene particles 査読有り

Tetsuya Yamamoto, Kazuya Tsutsumi, Yusuke Kawai

Polymer 202 巻頁： 122761 - 122761 2020年8月

Relationship between dispersion-forming capability of poly(4-vinylaniline) colloids and antimicrobial activity 査読有り

Tetsuya Yamamoto, Ryo Furuta, Kenji Arakawa, Aiko Teshima

Colloids and Surfaces A: Physicochemical and Engineering Aspects 596 巻頁： 124736 - 124736 2020年7月

Improved metal-resin adhesion via electroplating-induced polymer particle adsorption 査読有り

Yusuke Ota, Tetsuya Yamamoto

Surface and Coatings Technology 388 巻頁： 125591 - 125591 2020年4月

Synthesis of porous carbon hollow particles maintaining their structure using hyper-cross-linked Poly(St-DVB) hollow particles 査読有り

Yusuke Kawai, Tetsuya Yamamoto

Advanced Powder Technology 31 巻 ( 2 ) 頁： 614 - 620 2020年2月

自動車用金属部材/CFRTP界面の接着向上技術の開発

山本徹也

公益財団法人天野工業技術研究所平成30年度年次報告頁： 88 - 94 2019年12月

Controlling Porous Hollow Silica Particles through Soap-free Emulsion Polymerization with Polymer Core Particles 査読有り

Tetsuya Yamamoto, Yuya Takahashi

Chemistry Letters 48 巻 ( 10 ) 頁： 1229 - 1231 2019年10月

Influence of the size of polystyrene synthesized through soap-free emulsion polymerization on antimicrobial activity 査読有り

Tetsuya Yamamoto, Kenji Arakawa, Ryo Furuta, Aiko Teshima

Materials Today Communications 20 巻頁： 100572 - 100572 2019年9月

Synthesis of dimpled and submicron-sized polymer particles of different morphologies using free micromixer 査読有り

Yusuke Kawai, Tetsuya Yamamoto

Colloid and Interface Science Communications 32 巻頁： 100193 - 100193 2019年9月

炭素繊維強化熱可塑性樹脂の高性能化とリサイクルを実現する界面制御技術の開発

山本徹也

豊田研究報告 72 巻頁： 190 - 191 2019年5月

Preparation of PVA/Polymer Colloid nanocomposite Hydrogel Using PS-PNVA Particles 査読有り

Naoya Toyoda, Tetsuya Yamamoto, Kenji Arakawa, Aiko Teshima

Chemistry Letters 48 巻 ( 4 ) 頁： 378 - 381 2019年4月

Effect of Initiator Charge on Dispersion Stability of Polymer Particles Formed by Soap-free Emulsion Polymerization of 4-Vinylaniline or 4-Vinylpyridine 査読有り

Yamamoto Tetsuya, Furuta Ryo, Kawai Yusuke

CHEMISTRY LETTERS 48 巻 ( 3 ) 頁： 208 - 210 2019年3月

Synthesis of Polystyrene@Silica Particles through Soap-Free Emulsion Polymerization and Sol-Gel Reaction on Polymer Surfaces 査読有り

T. Yamamoto, and Y. Takahashi

Advanced Powder Technology 30 巻 ( 1 ) 頁： 214 - 218 2019年1月

界面特性を強化した熱可塑性炭素繊維強化プラスチックの作製

山本徹也

東燃ゼネラル石油研究奨励財団研究報告書 20 巻頁： in press 2018年12月

Antimicrobial activities of low molecular weight polymers synthesized through soap-free emulsion polymerization 査読有り

Yamamoto, Tetsuya, Arakawa, Kenji, Takahashi, Yuya, Sumiyoshi, Miho

European Polymer Journal 109 巻頁： 532-536 2018年12月

Antimicrobial activities of polymers synthesized through soap-free emulsion polymerization using a cationic initiator and styrene derivative monomers 査読有り

Yamamoto, Tetsuya; Arakawa, Kenji; Furuta, Ryo; Teshima, Aiko

Chemistry Letters 47 巻 ( 11 ) 頁： 1402-1404 2018年11月

Dispersion of carbon nanofibers modified with polymer colloids to enhance mechanical properties of PVA nanocomposite film 査読有り

Toyoda Naoya, Yamamoto Tetsuya

Colloids and Surfaces a-Physicochemical and Engineering Aspects 556 巻頁： 248 - 252 2018年11月

Design of polymer particles maintaining dispersion stability for the synthesis of hollow silica particles through sol-gel reaction on polymer surfaces 査読有り

Tetsuya Yamamoto, Yuya Takahashi

Colloids and Surfaces A: Physicochemical and Engineering Aspects 553 巻頁： 66 - 70 2018年9月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier B.V.

To synthesize polystyrene-silica core-shell particles and silica hollow particles, soap-free emulsion polymerization was carried out using styrene and N-vinylacetamide (NVA), and the Stöber method using tetraethyl orthosilicate (TEOS) was performed on the polymer particle surfaces. Here, NVA acts as a stabilizer for the polymer colloids, maintaining dispersion stability by synthesizing hydration layers even when the electrostatic adsorption of TEOS had occurred, and as a catalyst for the sol-gel reaction. NVA was polymerized by the cationic initiator located on the surface of the polystyrene particles to maintain dispersion stability by a steric effect. Therefore, the sol-gel reactions proceeded more efficiently on the surface of polymer particles, facilitated by the much larger surface area. Finally, the polymer core was removed by heating to prepare highly monodisperse silica hollow particles.

DOI： 10.1016/j.colsurfa.2018.05.036

Web of Science

Scopus

微粒子を利用した疎水性粉体の水への分散技術の開発

山本徹也

ホソカワ粉体工学振興財団年報 25 巻頁： 113-118 2018年5月

Effect of the surface properties of particle on the classification performance of a dry-cyclone 査読有り

Tetsuya Yamamoto, Motoharu Higashino

Particulate Science and Technology 36 巻 ( 1 ) 頁： 46 - 49 2018年1月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Taylor and Francis Inc.

The purpose of the present study was to investigate the effect of the surface properties of silica particles on the classification performance of a dry-cyclone. As a result, it was clear that the separation force between the surface of particle and the silicon was decreased by the AFM measurement when the surface of the silica particles could be modified with ethanol or acetone treatment. Fine particles in the original silica particles with the treatments were easily collected by the filter in a dry-cyclone system
hence, the particle classification performance was enhanced.

DOI： 10.1080/02726351.2016.1205691

Scopus

その他リンク： http://orcid.org/0000-0001-8179-900X

Enhancement of mechanical properties of carbon fiber reinforced thermoplastic using colloidal techniques 査読有り

Tetsuya Yamamoto, Katsumasa Uematsu, Syo Yabushita

Procedia Manufacturing 15 巻頁： 1738 - 1745 2018年

炭素繊維強化熱可塑性樹脂の高性能化を実現する界面制御技術の開発

山本徹也

新東技報 35 巻頁： 70-72 2017年12月

Enhancement of surface adhesion between thermoplastic resin and carbon fiber using polymer colloids 査読有り

Tetsuya Yamamoto, Katsumasa Uematsu, Toshihira Irisawa, Yasuhiro Tanabe

The Journal of Adhesion 93 巻 ( 12 ) 頁： 943 - 948 2017年10月

Improved mechanical properties of PMMA composites: Dispersion, diffusion and surface adhesion of recycled carbon fiber fillers from CFRP with adsorbed particulate PMMA 査読有り

Tetsuya Yamamoto, Yuta Makino, Katsumasa Uematsu

Advanced Powder Technology 28 巻 ( 10 ) 頁： 2774 - 2778 2017年10月

In-situ Adsorption of Polymer Particles on Multi-wall Carbon Nanotubes Using Colloidal Techniques 査読有り

Tetsuya Yamamoto, Naoya Toyoda

Colloids and Interface Science Communications 20 巻頁： 1 - 4 2017年9月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier B.V.

A novel technique for the adsorption of polymer particles on carbon nanotubes was developed. First, the surfaces of multi-wall carbon nanotubes (MWCNTs) were coated with poly(N-vinyl acetamide) (PNVA) to confer them hydrophilicity together with good dispersion stability in water owing to a steric effect between the hydration layers. Second, the hydrophilic MWCNTs were covered with polymethyl methacrylate (PMMA) particles bearing positive charges—synthesized using V-50—through electrostatic interactions. These polymers were obtained by soap-free emulsion polymerization. The in-situ adsorption of PMMA particles on surface MWCNTs were attributed to the hydration layers of the modified MWCNTs, and electrostatic interactions between PMMA particles and the modified MWCNTs. It can be expected that the PMMA particles adsorbed on the carbon nanotubes hold the potential to serve as glue between carbon nanotube and PMMA in the composite.

DOI： 10.1016/j.colcom.2017.07.003

Web of Science

Scopus

その他リンク： http://orcid.org/0000-0001-8179-900X

Synthesis and Electrical Properties of Composite Films Comprising Polymer Particles and Carbon Nanotubes 査読有り

Tetsuya Yamamoto, Kan Kawaguchi

Colloids and Interface Science Communications 20 巻頁： 5 - 8 2017年9月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier B.V.

In the present study, composite films were synthesized from composite polymer particles prepared with multi-wall carbon nanotubes (MWCNTs) by in situ polymerization. Because one of the advantages of MWCNTs compared to other preparation methods is high electrical conductivity, the electrical properties of the composite films were evaluated by the direct current two-terminal method. As a result, the composite film prepared by MWCNTs had conductive paths and showed higher conductivity even at lower mass fraction of MWCNTs compared with the previous works to keep transparency. This method was shown to decrease the mass fractions of MWCNTs and increase the transparency of the composite films.

DOI： 10.1016/j.colcom.2017.08.001

Web of Science

Scopus

その他リンク： http://orcid.org/0000-0001-8179-900X

Synthesis of composite polymer particles with carbon nanotubes and evaluation of their mechanical properties 査読有り

Tetsuya Yamamoto, Kan Kawaguchi

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 529 巻頁： 765 - 770 2017年9月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

In the present study, a method for synthesizing composite polymer particles with multi-wall carbon nanotubes (MWCNTs) was developed, and the particles' mechanical properties were evaluated. First, the surfaces of MWCNTs were modified by acids to increase their hydrophilicity, resulting in surface-active MWCNTs. Then, a Pickering emulsion was formed using liquid benzyl methacrylate monomer and the surface-active MWCNTs. The surface charge of the surface-active MWCNTs greatly influenced the surface coverage and size of the composite particles. Furthermore, when untreated MWCNTs were added to the monomer phase, surface coverage of the resulting particles was enhanced because MWCNTs on the surface of the particles interacted with MWCNTs incorporated inside the particles, thus preventing the surface-active MWCNTs on the surface from being released into the bulk. As a result, the mechanical properties of the composite polymer particles were successfully improved because the incorporated MWCNTs worked well as fillers.

DOI： 10.1016/j.colsurfa.2017.05.075

Web of Science

Scopus

その他リンク： http://orcid.org/0000-0001-8179-900X

Anomalous particle through soap-free emulsion polymerization of styrene using oil-soluble initiator 査読有り

Tetsuya Yamamoto, SeulChan Kim

JOURNAL OF POLYMER RESEARCH 24 巻 ( 9 ) 頁： 149 2017年8月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SPRINGER

One of oil-soluble initiators, VF-096, might work as cross-linker. This initiator would enable to synthesize the particle with cross-linking, which was involved with the particle morphology. Soap-free emulsion polymerization of styrene using this initiator was carried out to develop the method to control the particle morphology in one batch system. As a result, it was found that anomalous particle was generated without stirring and the particle morphology changed to be spherical by increasing shear stress through the stirring. One of the origins of the anomalous particle was the phase separation of the water in the particle and release of it from inside of the particle to the bulk.

DOI： 10.1007/s10965-017-1316-2

Web of Science

Scopus

その他リンク： http://orcid.org/0000-0001-8179-900X

Controlling the particle cut size of a dry cyclone using acetone 査読有り

Tetsuya Yamamoto, Motoharu Higashino

Particulate Science and Technology 35 巻 ( 2 ) 頁： 214 - 218 2017年3月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Taylor and Francis Inc.

In this study, we investigated the interaction between particles and the wall in the presence of mist to improve the particle classification performance of a dry cyclone. The interaction between a silica particle and a mica surface in the presence of a flowing acetone mist was measured by performing atomic force microscopy (AFM), which showed that an attractive force was generated and became stronger as time passed while acetone mist was supplied to the system, probably because of static electricity. In a dry cyclone system, this attractive force could enhance the classification performance. In particular, when acetone mist was supplied into the cyclone from the upper part of the dust box at higher flow rates, the classification performance was enhanced. Because acetone is highly volatile and has a low viscosity, the classification performance was improved by the evaporated acetone even when a cyclone with a dust box filled with acetone was used instead of a nozzle supplying the mist. In this case, the ratio of the mass of the particles collected by the upper part of the cyclone to the total mass of the feed powder was increased, probably because of the attractive force between the silica particles and the wall of the cyclone. Moreover, the cut size of the dry cyclone could be controlled by changing the amount of acetone in the dust box of the cyclone.

DOI： 10.1080/02726351.2016.1150370

Scopus

その他リンク： http://orcid.org/0000-0001-8179-900X

CFRTPの高性能化を実現するコロイド技術招待有り

山本徹也

化学装置 59 巻 ( 3 ) 頁： 45 - 48 2017年3月

Synthesis of hydrocolloid through polymerization of styrene and N-vinyl acetamide by AIBN 査読有り

Tetsuya Yamamoto, Yuya Takahashi

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 516 巻頁： 80 - 84 2017年3月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

The soap-free emulsion polymerization of styrene with hydrophilic monomer, N-vinyl acetamide (NVA), using oil-soluble initiator was carried out to synthesize polymeric particles with good dispersion stability and improve the polymer yield. As a result, it was found that the polymer yield and dispersion stability were enhanced by the promotion of polymerization by the dissolved monomers and hydrogen bonding between NVA on the particle surface and water molecules in the bulk. Accordingly, this polymer colloid showed the nature of hydrocolloid by their hydration layers because its dispersion stability was kept even when the electrolytes were added to the system. In the conventional soap-free emulsion polymerization, the counter ions including the water-soluble initiators were remained in the water phase. However, because all of chemical components in the present study were consumed for the polymerization, the impurities except polymers were hardly remained in the bulk. (C) 2016 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.colsurfa.2016.12.023

Web of Science

Scopus

その他リンク： http://orcid.org/0000-0001-8179-900X

炭素繊維強化熱可塑性樹脂の高性能化を実現するコロイド技術招待有り査読有り

山本徹也、上松克匡、入澤寿平、田邊靖博

粉体工学会誌 53 巻 ( 12 ) 頁： 786 - 791 2016年12月

Controlling of the interfacial shear strength between thermoplastic resin and carbon fiber by adsorbing polymer particles on carbon fiber using electrophoresis 査読有り

Tetsuya Yamamoto, Katsumasa Uematsu, Toshihira Irisawa, Yasuhiro Tanabe

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING 88 巻頁： 75 - 78 2016年9月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCI LTD

In order to control the interfacial adhesion between carbon fibers and thermoplastic resins, poly(methyl methacrylate) (PMMA) particles have been adsorbed on the carbon fiber surfaces using an electrophoresis process. The amount of PMMA particles adsorbed on the modified carbon fibers was varied using the electrophoresis technique performed in polymer colloids for a short time. Additionally, the interfacial shear strength between the modified carbon fiber and the resin was controlled by a modification of the present process. An improved interaction and a strengthened surface adhesion between the carbon fiber coated with particles and the PMMA resin were observed. (C) 2016 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.compositesa.2016.05.021

Web of Science

Scopus

その他リンク： http://orcid.org/0000-0001-8179-900X

Particle size control in the soap-free emulsion polymerization of styrene by an oil-soluble initiator with a weakly acidic water-soluble initiator 査読有り

Tetsuya Yamamoto, Kan Kawaguchi, Yuya Takahashi

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 502 巻頁： 1 - 5 2016年8月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

The soap-free emulsion polymerization of styrene by an oil-soluble initiator, 2,2'-azobis(2-methylpropionitrile) (AIBN), with a water-soluble initiator, 4,4'-azobis(4-cyanovaleric acid) (V-501), was conducted in water to control the size of the synthesized polymeric particles. The particle size and surface potential were monitored as concentration of V-501 used for the polymerization was varied. When the V-501 concentration was increased, the particle size increased because V-501 was a weak acid and reduced the surface potential, thereby promoting particle growth through coagulation. Additionally, V-501 can also function as a radical initiator, increasing the efficiency of the polymerization reaction and, thus, the number concentration of the particles. (C) 2016 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.colsurfa.2016.04.048

Web of Science

Scopus

その他リンク： http://orcid.org/0000-0001-8179-900X

Relationship between Surface Potential and Particle Size in Soap-free Emulsion Copolymerization of Styrene and Methyl Methacrylate using a Water- or Oil-soluble Initiator 査読有り

Colloid & Polymer Science 294 巻頁： 281 - 284 2016年2月

Effect of the Amount of pi Electrons in Aromatic Monomer on the Surface Potential of Polymeric Particles Obtained through Soap-free Emulsion Polymerization Using AIBN 査読有り

Tetsuya Yamamoto

CHEMISTRY LETTERS 44 巻 ( 11 ) 頁： 1555 - 1556 2015年11月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：CHEMICAL SOC JAPAN

The surface potential of polymeric particles obtained through soap-free emulsion polymerization using an oil-soluble initiator, 2,2'-azobis(2-methylpropionitrile) (AIBN), depended on the monomer used in the polymerization. Changing the amount of it electrons in the aromatic monomer enabled control of the surface potential of the synthesized particles. It was found that the negative charges of the synthesized particles were strengthened for their sizes to be reduced gradually as the amount of it electrons in the monomer was increased.

DOI： 10.1246/cl.150759

Web of Science

Scopus

その他リンク： http://orcid.org/0000-0001-8179-900X

Effect of Counter Ionic Radius in Initiator on Particle Size in Soap-free Emulsion Polymerization of Styrene 査読有り

Tetsuya Yamamoto, Taichi Yokoyama

CHEMISTRY LETTERS 44 巻 ( 6 ) 頁： 824 - 825 2015年6月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：CHEMICAL SOC JAPAN

Soap-free emulsion polymerization of styrene was carried out to synthesize particles with the size under 100 nm. Changing the concentration of initiator, VA-044, enabled us to control the size under 100 nm in soap-free emulsion polymerization of styrene. Furthermore, making the counter ion radius in initiator smaller was effective for reducing the size of particles in the polymerization.

DOI： 10.1246/cl.150148

Web of Science

Scopus

その他リンク： http://orcid.org/0000-0001-8179-900X

Effect of electrolyte species on size of particle through soap-free emulsion polymerization of styrene using AIBN and electrolyte 査読有り

Tetsuya Yamamoto, Kan Kawaguchi

COLLOID AND POLYMER SCIENCE 293 巻 ( 3 ) 頁： 1003 - 1006 2015年3月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SPRINGER

The addition of electrolyte to a soap-free emulsion polymerization using oil-soluble initiator, 2,2'-azobis(2-methylpropionitrile) (AIBN), was useful for production of the micron-sized polystyrene particle. To investigate the effect of electrolyte species on particle size, we focus on the counter ion and ionic radius of the cation during the synthesis of the particle. As a result, because the order of acid dissociation constant of the acid was HCl < HNO3 < CH3COOH, the suspension using chloride salt has lower pH and included the larger particles due to the coagulation growth process. Cation with a larger ionic radius could promote the particle growth strongly because its hydration was so weaker that it had the ability to reduce the thickness of the electrical double layer of negatively charged polystyrene particle. In summary, the addition of strongly acidic salt with larger cationic radius to the polymerization was efficient for making the size of polystyrene particle larger.

DOI： 10.1007/s00396-015-3511-1

Web of Science

Scopus

その他リンク： http://orcid.org/0000-0001-8179-900X

Particle size measurement of reference particle candidates and uncertainty region of count and mass based cumulative distribution 査読有り

H. Yoshida, T. Yamamoto, Y. Mori, H. Masuda, K. Okazaki and H. Sugasawa

Advanced Powder Technology 25 巻 ( 6 ) 頁： 1748 - 1753 2014年12月

乾式サイクロンの入口清浄空気および案内羽根が粒子分級性能に与える影響査読有り

竹田尚広, 忍足輝男, 山本徹也, 福井国博, 吉田英人

粉体工学会誌 51 巻 ( 9 ) 頁： 614 - 622 2014年9月

蒸気を援用した新規微粒子分離・分級技術の開発招待有り

山本徹也，吉田英人

ホソカワ粉体工学振興財団　年報 21 巻頁： 101 - 106 2014年5月

電場印加型の垂直流型水篩による微粒子の高精度分級査読有り

松沢光晴，高井健次，坂本裕太郎，村上公威，福井国博，山本徹也，吉田英人

粉体工学会誌 51 巻 ( 2 ) 頁： 68 - 76 2014年2月

Theoretical calculation of uncertainty region for spherical particles based on a picket fence, quasi-monodisperse particles, 査読有り

Yoshida, H., H. Sunagawa, K. Fukui, T. Yamamoto, and H. Masuda

Advanced Powder Technology 25 巻 ( 2 ) 頁： 524 - 529 2014年

粒子表面特性に基づいた分級操作とミクロン粒子の調製招待有り

山本徹也，吉田英人

ケミカルエンジニアリング 58 巻 ( 11 ) 頁： 40 - 43 2013年11月

Synthesis of nearly micron-sized particles by soap-free emulsion polymerization of methacrylic monomer using an oil-soluble initiator 査読有り

Yamamoto, Tetsuya

Colloid and Polymer Science 291 巻 ( 11 ) 頁： 2741 - 2744 2013年11月

Effect of free air inflow method on fine particle classification of gas-cyclone 査読有り

Hiraiwa, Yusuke Oshitari, Teruo Fukui, Kunihiro Yamamoto, Tetsuya Yoshida, Hideto

Separation and Purification Technology 118 巻頁： 670 - 679 2013年10月

Effect of packing fraction on indium tin oxide powder synthesis via a solid-phase reaction with microwave heating 査読有り

Fukui, Kunihiro Katoh, Manabu Saeki, Yuta Yamamoto, Tetsuya Yoshida, Hideto

Chemical Engineering Science 98 巻頁： 17 - 24 2013年7月

Hydrodynamic boundary condition of water on hydrophobic surfaces 査読有り国際共著

Schaeffel, David Yordanov, Stoyan Schmelzeisen, Marcus Yamamoto, Tetsuya Kappl, Michael Schmitz, Roman Duenweg, Burkhard Butt, Hans-Juergen Koynov, Kaloian

Physical Review E 87 巻 ( 5 ) 頁： 051001 2013年5月

A new method of zeta-potential measurement by the use of the sedimentation balance method 査読有り

Yoshida, Hideto Tatekawa, Takahisa Fukui, Kunihiro Yamamoto, Tetsuya Takai, Kenji Matuzawa, Mitsuharu

237 巻頁： 303 - 308 2013年3月

Mechanism of synthesis of metallic oxide powder from aqueous metallic nitrate solution by microwave denitration method 査読有り

Fukui, Kunihiro Igawa, Yusuke Arimitsu, Naoki Suzuki, Masahiro Segawa, Tomoomi Fujii, Kan-ichi Yamamoto, Tetsuya Yoshida, Hideto

Chemical Engineering Journal 211 巻頁： 1 - 8 2012年11月

Soap-free emulsion polymerization of aromatic vinyl monomer using AIBN 査読有り

Yamamoto, Tetsuya

Colloid and Polymer Science 290 巻 ( 17 ) 頁： 1833 - 1835 2012年11月

粒子表面物性を利用した微粒子分級システムの開発招待有り

山本徹也

粉体工学会誌 49 巻 ( 11 ) 頁： 832 - 836 2012年11月

Synthesis of micron-sized polymeric particles in soap-free emulsion polymerization using oil-soluble initiators and electrolytes 査読有り

Yamamoto, Tetsuya

Colloid and Polymer Science 290 巻 ( 11 ) 頁： 1023 - 1031 2012年7月

Effect of conical length on separation performance of sub-micron particles by electrical hydro-cyclone 査読有り

Yoshida, Hideto Hayase, Yuuki Fukui, Kunihiro Yamamoto, Tetsuya

Powder Technology 219 巻頁： 29 - 36 2012年3月

Theoretical calculation of uncertainty region based on the general size distribution in the preparation of standard reference particles for particle size measurement 査読有り

Yoshida, Hideto Yamamoto, Tetsuya Fukui, Kunihiro Masuda, Hiroaki

Advanced Powder Technology 23 巻 ( 2 ) 頁： 185 - 190 2012年3月

焼結金属製円錐を持つ液体サイクロンの分級特性査読有り

村重佳奈，福井国博，西田幸生，山本徹也，吉田英人

粉体工学会誌 49 巻頁： 367 - 373 2012年

改良型の乾式サイクロンによる粒子分離性能の向上査読有り

竹田尚広，西村洋佑，小澤和三，山本徹也，福井国博，吉田英人

粉体工学会誌 48 巻 ( 12 ) 頁： 840 - 846 2011年12月

遠心場・電場を利用したナノ粒子分級装置の開発招待有り

山本徹也

粉体技術 49 巻 ( 11 ) 頁： 832 - 836 2011年9月

Effects of clean-air injection on particle-separation performance of novel cyclone with sintered metal cone 査読有り

Fukui, Kunihiro Yoshida, Hideto Jikihara, Kenji Yamamoto, Tetsuya

Separation and Purification Technology 80 巻 ( 2 ) 頁： 356 - 363 2011年7月

制御流同伴型サイクロンの分離性能招待有り

福井国博，吉田英人，山本徹也

工業加熱 48 巻 ( 5 ) 頁： 37 - 41 2011年5月

Separation of Unburned Carbon in Fly Ash Particles Using Special Louver Separator 査読有り国際共著

Nenu, RKT Izumi, S Yoshida, H Fukui, K Yamamoto, T

Journal of Chemical Engineering of Japan 44 巻 ( 3 ) 頁： 146 - 154 2011年

Theoretical calculation of fundamental uncertainty region based on the maximum and/or the minimum size in the preparation of standard reference particles for particle size measurement 査読有り

Yoshida, H Igushi, T Yamamoto, T Masuda, H

Advanced Powder Technology 22 巻 ( 1 ) 頁： 43 - 49 2011年

Enhancement of the Classification Performance of Electrical Field-Flow Fractionation Using Horizontal Electrophoresis 査読有り

Yamamoto, T Tatekawa, T Fukui, K Yoshida, H

Journal of Chemical Engineering of Japan 44 巻 ( 6 ) 頁： 398 - 404 2011年

Classification of particles by centrifugal separator and analysis of the fluid behavior 招待有り

Yamamoto, T Shinya, T Fukui, K Yoshida, H

Advanced Powder Technology 22 巻 ( 2 ) 頁： 294 - 299 2011年

Classification of Particles Dispersed by Bead Milling with Electrophoresis 査読有り

Yamamoto, Tetsuya Harada, Yoshitaka Tsuyama, Takayuki Fukui, Kunihiro Yoshida, Hideto

Kona Powder and Particle Journal 29 巻頁： 125 - 133 2011年

局所的な静電場印可および流動制御を利用した液体サイクロンの高性能化査読有り

粉体工学会誌 48 巻 ( 8 ) 頁： 526 - 533 2011年

Controlled synthesis of high performance polyamide membrane with thin dense layer for water desalination 査読有り国際共著

Kong, Chunlong Kanezashi, Masakoto Yamomoto, Tetsuya Shintani, Takuji Tsuru, Toshinori

Journal of Membrane Science 362 巻 ( 1-2 ) 頁： 76 - 80 2010年10月

Influence of inlet flow rate, pH, and beads mill operating condition on separation performance of sub-micron particles by electrical hydrocyclone 査読有り国際共著

Nenu, RKT Hayase, Y Yoshida, H Yamamoto, T

Advanced Powder Technology 21 巻 ( 3 ) 頁： 246 - 255 2010年

Effect of apex cone shape on fine particle classification of gas-cyclone 査読有り

Yoshida, H Nishimura, Y Fukui, K Yamamoto, T

Powder Technology 204 巻 ( 1 ) 頁： 54 - 62 2010年

AFM investigation of the surface properties of silica particles dispersed by bead milling 査読有り

Yamamoto, T Harada, Y Fukui, K Yoshida, H

Colloids and Surfaces a-Physicochemical and Engineering Aspects 362 巻 ( 1-3 ) 頁： 97-101 2010年

改良型の軸流サイクロンを用いた集塵および脱硫性能の検討査読有り

金子幸生，山本徹也，福井国博，吉田英人

粉体工学会誌 46 巻 ( 9 ) 頁： 681 - 687 2009年9月

Performance of fuel cell using calcium phosphate hydrogel membrane prepared from waste incineration fly ash and chicken bone powder 査読有り

Fukui, K Arimitsu, N Jikihara, K Yamamoto, T Yoshida, H

Journal of Hazardous Materials 168 巻 ( 2-3 ) 頁： 1617 - 1621 2009年

Particle size measurement of standard reference particle candidates and theoretical estimation of uncertainty region 査読有り

Yoshida, H Mori, Y Masuda, H Yamamoto, T

Advanced Powder Technology 20 巻 ( 2 ) 頁： 145 - 149 2009年

Improvement of gas-cyclone performance by use of local fluid flow control method 査読有り

Yoshida, H Inada, Y Fukui, K Yamamoto, T

Powder Technology 193 巻 ( 1 ) 頁： 6 - 14 2009年

Continuous fine particle classification by water elutriator with applied electro-potential 招待有り

Yoshida, H Fukui, K Yamamoto, T Hashida, A Michitani, N

Advanced Powder Technology 20 巻 ( 5 ) 頁： 398-405 2009年

Effect of inner structure of centrifugal separator on particle classification performance 査読有り

Yamamoto, T Watanabe, N Fukui, K Yoshida, H

Powder Technology 192 巻 ( 3 ) 頁： 268 - 272 2009年

Classification of Particles Dispersed by Bead Milling Using Electrical Field-Flow Fractionation 査読有り

Yamamoto, T Harada, Y Fukui, K Yoshida, H

Journal of Chemical Engineering of Japan 42 巻 ( 10 ) 頁： 720 - 727 2009年

Separation performance of sub-micron silica particles by electrical hydrocyclone 査読有り国際共著

Nenu, RKT Yoshida, H Fukui, K Yamamoto, T

Powder Technology 196 巻 ( 2 ) 頁： 147 - 155 2009年

Synthesis of calcium phosphate hydrogel from waste incineration fly ash and its application to fuel cell 査読有り

Fukui, K Kidoguchi, S Arimitsu, N Jikihara, K Yamamoto, T Yoshida, H

Journal of Environmental Management 90 巻 ( 8 ) 頁： 2709 - 2714 2009年

Utilization of NaCl for phillipsite synthesis from fly ash by hydrothermal treatment with microwave heating 査読有り

Fukui, K Katoh, M Yamamoto, T Yoshida, H

Advanced Powder Technology 20 巻 ( 1 ) 頁： 35 - 40 2009年

Synthesis of indium tin oxide powder by solid-phase reaction with microwave heating 査読有り

Fukui, K Kanayama, K Katoh, M Yamamoto, T Yoshida, H

Advanced Powder Technology 20 巻 ( 5 ) 頁： 488 - 492 2009年

Synthesis of calcium phosphate hydrogel from waste incineration fly ash and bone powder 査読有り

Fukui, K Arimitsu, N Kidoguchi, S Yamamoto, T Yoshida, H

Journal of Hazardous Materials 163 巻 ( 1 ) 頁： 391 - 395 2009年

一般廃棄物焼却飛灰のリン酸カルシウムハイドロゲルへの再資源化に与える前処理の影響査読有り

福井国博, 直原健司，木戸口聡，有満直樹，山本徹也, 吉田英人

粉体工学会誌 45 巻 ( 10 ) 頁： 684 - 689 2008年10月

一般廃棄物焼却飛灰のリン酸カルシウムハイドロゲルへの再資源化査読有り

化学工学論文集 34 巻 ( 2 ) 頁： 304 - 308 2008年

Effect of Multi-Inlet Flow on Particle Classification Performance of Hydro-Cyclones and New Estimating Equation 査読有り国際共著

Yoshikawa, S Romanus, K Fukui, K Yamamoto, T Yoshida, H

Journal of Chemical Engineering of Japan 41 巻 ( 8 ) 頁： 756 - 765 2008年

Effect of multi-inlet flow on particle classification performance of hydro-cyclones 査読有り

Yoshida, H Yoshikawa, S Fukui, K Yamamoto, T

Powder Technology 184 巻 ( 3 ) 頁： 352 - 360 2008年

Molecular-scale investigation of polymerization, nucleation and growth of polystyrene particle by atomic force microscopy 招待有り査読有り

Yamamoto, T Higashitani, K

Asia-Pacific Journal of Chemical Engineering 3 巻 ( 3 ) 頁： 239 - 249 2008年

出口構造改良型遠心分離機による微粒子の分級査読有り

山本徹也, 小谷俊枝，福井国博, 吉田英人

粉体工学会誌 44 巻 ( 12 ) 頁： 861 - 867 2007年12月

Effects of microwave irradiation on the crystalline phase of zeolite synthesized from fly ash by hydrothermal treatment 査読有り

Fukui, K Kanayama, K Yamamoto, T Yoshida, H

Advanced Powder Technology 18 巻 ( 4 ) 頁： 381 - 393 2007年7月

遠心分離機による微粒子の分級とその流動解析

山本徹也, 新屋智彦，福井国博, 吉田英人

粉体工学会誌 44 巻 ( 5 ) 頁： 345 - 352 2007年5月

Growth processes of poly methylmethacrylate particles investigated by atomic force microscopy 査読有り

Yamamoto, T Higashitani, K

Advanced Powder Technology 18 巻 ( 5 ) 頁： 567 - 577 2007年

電圧印加型水篩装置による微粒子の高精度分級査読有り

吉田英人, 福井国博, 山本徹也, 橋田　歩, 道谷法寛

粉体工学会誌 43 巻 ( 8 ) 頁： 550 - 558 2006年8月

Initial growth process of polystyrene particle investigated by AFM 査読有り

Yamamoto, T Kanda, Y Higashitani, K

Journal of Colloid and Interface Science 299 巻 ( 1 ) 頁： 493 - 496 2006年7月

Nucleation and growth process of polystyrene particle investigated by AFM 査読有り

Yamamoto, T Kanda, Y Higashitani, K

Journal of Chemical Engineering of Japan 39 巻 ( 6 ) 頁： 596 - 603 2006年6月

ポリスチレンラテックス粒子の核生成・成長過程の分子オーダ解析招待有り

山本徹也，東谷　公

日本ゴム協会誌 79 巻 ( 2 ) 頁： 54 - 59 2006年2月

Molecular-scale observation of the surface of polystyrene particles by AFM 査読有り

Yamamoto, T Fukushima, T Kanda, Y Higashitani, K

Journal of Colloid and Interface Science 292 巻 ( 2 ) 頁： 392 - 396 2005年12月

AFM observation of growing poly isobutyl methacrylate (PiBMA) particles 査読有り

Yamamoto, T Inoue, M Kanda, Y Higashitani, K

Chemistry Letters 33 巻 ( 11 ) 頁： 1440 - 1441 2004年11月

Molecular-scale observation of formation of nuclei in soap-free polymerization of styrene 査読有り

Yamamoto, T Kanda, Y Higashitani, K

Langmuir 20 巻 ( 11 ) 頁： 4400 - 4405 2004年5月

Origin of the apparent long-range attractive force between surfaces in cyclohexane 査読有り

Advanced Powder Technology 13 巻 ( 2 ) 頁： 149 - 156 2002年

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