Faculty Profiles - YAMAMOTO Tetsuya

Papers - YAMAMOTO Tetsuya

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

T. Yamamoto, and K. Tsutsumi

ACS Omega Vol. 6 ( 47 ) page： 31677 - 31682 2021.11

Size Control of Polystyrene Nanoparticles Synthesized in Melamine Foam Reviewed

Shinya Ouchi, Naoki Yamada, Tetsuya Yamamoto

Industrial & Engineering Chemistry Research Vol. 59 ( 40 ) page： 17927 - 17933 2020.10

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

Tetsuya Yamamoto, Sho Yabushita, Toshihira Irisawa, Yasuhiro Tanabe

Composites Science and Technology Vol. 181 page： 107665 - 107665 2019.9

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

Tetsuya Yamamoto, Katsumasa Uematsu, Toshihira Irisawa, Yasuhiro Tanabe

Composites Part A: Applied Science and Manufacturing Vol. 112 page： 250 - 254 2018.9

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：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 Invited Reviewed

Tetsuya Yamamoto, Ko Higashitani

KONA Powder and Particle Journal Vol. 35 ( 0 ) page： 66 - 79 2018

Growth mechanism of soap-free polymerization of styrene investigated by AFM Reviewed

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

Journal of Colloid and Interface Science Vol. 297 ( 1 ) page： 112-121 2006.5

Nanoparticle formation of β-carotene by mixing supercritical carbon dioxide antisolvent with liquefied dimethyl ether feed solution using swirl mixer Reviewed International coauthorship

Li Mei, Hideki Kanda, Li Zhu, Tao Wang, Tetsuya Yamamoto

Advanced Powder Technology Vol. 36 ( 6 ) page： 104871 - 104871 2025.6

Formation of Hollow Nanoparticles by Inclusion and Decomposition of Azo Compounds and Their Properties International coauthorship

Tetsuya YAMAMOTO

Hosokawa Powder Technology Foundation ANNUAL REPORT 2025.5

Fiber-Optic Sensor Modified by Electrospun Polymer/Ti3C2 MXene–TiO2 for Dimethyl Sulfoxide Sensing Reviewed International coauthorship

Tao Wang, Li Zhu, Yunpeng Yue, Yasuhito Mukai, Hideki Kanda, Tetsuya Yamamoto

Talanta Vol. 287 page： 127630 - 127630 2025.5

Introduction of oxygen‐containing functional groups to carbon fiber surfaces to enhance the bending strength of <scp>PA6</scp>‐based carbon‐fiber‐reinforced thermoplastics International coauthorship

Sulchan Kim, Akiko Yagi, Tetsuya Yamamoto

Polymer Composites 2025.4

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

Abstract

Carbon‐fiber‐reinforced thermoplastics (CFRTPs) are recyclable composite materials with excellent mechanical properties. However, for CFRTPs to be used in automobile applications, enhanced mechanical properties are required. To meet this challenge, the surface adhesion between the carbon fibers and thermoplastics must be improved. In this study, we developed surface treatment techniques for carbon fibers using the radical initiator dimethyl 2,2′‐azobis(2‐methylpropionate) (V‐601) to introduce oxygen‐containing functional groups to the carbon fibers through radical chemical reactions. Using x‐ray photoelectron spectroscopy, we showed that the surface adhesion between the carbon fibers and a nylon thermoplastic resin (PA6) improved owing to hydrogen bonding with carbonyl groups on the carbon fiber surface, which enhanced the mechanical properties of the CFRTP. Moreover, we demonstrated control of the mechanical properties of the CFRTP by varying the V‐601‐acetone concentration. The findings of this study can be used to develop automobile applications for PA6‐based CFRTPs.

Highlights

Carbon‐fiber‐reinforced thermoplastics (CFRTPs) have good mechanical properties.

Surface adhesion between carbon fibers and thermoplastic resin PA6 was improved.

Surface treatment techniques for carbon fibers were developed.

Dimethyl 2,2′‐azobis(2‐methylpropionate) (V‐601) was used for this.

DOI： 10.1002/pc.29919

Web of Science

Brilliant and Angular‐Independent Photonic Balls Using High‐Refractive‐Index Inorganic‐Polymer Hybrid Materials Reviewed International coauthorship Open Access

Yangnan Jiang, Ayano Shirai, Michinari Kohri, Ryosuke Ohnuki, Shinya Yoshioka, Tetsuya Yamamoto, Yukikazu Takeoka

Advanced Optical Materials Vol. 13 ( 9 ) 2025.3

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

Abstract

In the modern era, structural color materials are regarded as safe and promising alternatives to colorants that contain harmful components. However, developing structural color materials that exhibit vivid colors with minimal angular dependence is crucial for their practical application. In this study, spherical colloidal crystals (photonic balls) with bright colors and effectively suppressed angular dependence are developed using monodisperse high refractive index CeO₂ particles. To fabricate these photonic balls, CeO₂@PDA particles are synthesized by coating CeO₂ particles with polydopamine (PDA), a black component. The light‐absorbing PDA coating on each particle uniformly reduces the multiple scattering of light to form a black background, allowing the CeO₂@PDA photonic balls to exhibit brilliant structural colors. Compared to SiO₂ particles photonic balls, which are widely studied in previous research, CeO₂@PDA photonic balls have a significantly reduced angular dependence of structural color hue due to their composition of materials with a higher refractive index. Additionally, the CeO₂@PDA photonic balls are heat‐treated in a nitrogen atmosphere, transforming the polymer component on the particle surface into a black carbonaceous material with a higher refractive index. This process further reduces the angular dependence of structure color hues observed from the photonic balls and improves color vibrancy.

DOI： 10.1002/adom.202402863

Open Access

Web of Science

Effect of electrostatic interaction between particle and substrate on the colloidal layer structure prepared by convective self-assembly Reviewed International coauthorship

Akane Oka, Tetsuya Yamamoto, Hidetaka Kawakita, Keisuke Ohto, Shintaro Morisada

Advanced Powder Technology Vol. 36 ( 3 ) page： 104811 - 104811 2025.3

Synthesis of Polymer Nano Particle using Packed Reactor with Glass Beads Invited Reviewed International coauthorship

Tetsuya Yamamoto, Natsuhide Hori, Ayumi Morino, Subaru Okuda, Hideki Kanda

Journal of the Society of Powder Technology, Japan Vol. 62 ( 2 ) page： 91 - 94 2025.2

Environmentally Friendly Synthesis of Polymer Nanoparticles in a Packed Reactor Using Glass Beads Invited Reviewed International coauthorship

Tetsuya Yamamoto, Ayumi Morino, Hideki Kanda, Ayumu Seki, Toru Ishigami

Macromolecular Reaction Engineering Vol. 19 ( 1 ) 2025.2

Removal of acetyl-rich impurities from chitosan using liquefied dimethyl ether Reviewed International coauthorship

Tao Wang, Kaito Kusumi, Li Zhu, Li Mei, Aiya Manabe, Mohammad Reza Asghari, Bahram Hosseinzadeh Samani, Tetsuya Yamamoto, Hideki Kanda

International Journal of Biological Macromolecules Vol. 280 page： 136381 - 136381 2024.11

N,N-dimethylformamide detection and refractive index sensing using an electrospun polymer/Ti3C2 MXene-TiO2 modified optical fiber sensor Reviewed International coauthorship

Tao Wang, Li Zhu, Yunpeng Yue, Mohammad Reza Asghari, Bahram Hosseinzadeh Samani, Tetsuya Yamamoto, Yasuhito Mukai, Hideki Kanda

Sensors and Actuators B: Chemical Vol. 417 page： 136143 - 136143 2024.10

Density and porosity analyses of porous hybrid microparticles containing gas in closed pores using centrifugal liquid sedimentation–dynamic light scattering combined analytical method Reviewed International coauthorship

Tetsuji Yamaguchi, Tetsuya Yamamoto

Analytical Sciences Vol. 40 ( 10 ) page： 1881 - 1888 2024.10

Improvement of carbon fiber oxidation resistance by thin ceramic coating using silica particles Reviewed International coauthorship

Kohei Kira, Tetsuya Yamamoto, Yoshiki Sugimoto, Izuru Shimabukuro, Aika Hikosaka, Toshihira Irisawa

Carbon Vol. 228 page： 119417 - 119417 2024.9

Carbon fiber‐reinforced thermoplastic synthesized by the hypercrosslinking reaction of polyether ether ketone Reviewed International coauthorship

Tetsuya Yamamoto, Takumi Nakamoto, Toshihira Irisawa

Polymer Composites Vol. 45 ( 12 ) page： 11473 - 11479 2024.8

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Abstract

Recently, thermoplastic resins were used as matrix to synthesize carbon fiber‐reinforced thermoplastic (CFRTP) for recycling it easily. In this study, a CFRTP with excellent mechanical properties and heat resistance was synthesized using a polyether ether ketone (PEEK) as a matrix resin. The PEEK resin was modified to form cross‐linked structures through Friedel–Crafts reaction alkylation. The synthesis temperature of CFRTP was optimized considering the mechanical properties of PEEK, and its heat resistance was enhanced because of the cross‐linked structures. Further, the cross‐linked PEEK resin was partially used as a matrix resin, and the mechanical properties of the CFRTP were enhanced. We plan to develop a method for recycling CFRTP using PEEK and crosslinked PEEK for synthesizing C/C composites by focusing on the high heat resistance of the crosslinked PEEK containing a large amount of carbon and reducing mass loss after heat treatment.

Highlights

CC bonds were introduced into the polyether ether ketone (PEEK) resin by Friedel–Crafts reaction alkylation.

Thermal properties of PEEK were enhanced by hypercrosslinking reaction.

Optimization of synthesized temperature was investigated to fabricate carbon fiber‐reinforced thermoplastic (CFRTP).

Mechanical properties were enhanced CFRTP modified with hypercrosslinking reaction.

DOI： 10.1002/pc.28579

Web of Science

Environmental-friendly extraction of di(2-ethylhexyl) phthalate from poly(vinyl chloride) using liquefied dimethyl ether Reviewed International coauthorship

Tao Wang, Hideki Kanda, Kaito Kusumi, Li Mei, Lijuan Zhang, Hiroshi Machida, Koyo Norinaga, Tetsuya Yamamoto, Hiroshi Sekikawa, Kengo Yasui, Li Zhu

Waste Management Vol. 183 page： 21 - 31 2024.6

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Papers - YAMAMOTO Tetsuya