Papers by Author: Kiyoshi Kanamura

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Authors: Jun Ichi Hamagami, Kazuhiro Hasegawa, Kiyoshi Kanamura
Abstract: A novel micro-fabrication technique for particle assembly has been performed by an electrophoretic deposition (EPD) method using a local electric field in a colloidal suspension generated by a microelectrode. This unique EPD technique was called a “μ-EPD process”. Monodispersed polystyrene microspheres with diameters of 204, 290, and 320 nm were used in this study. A 50 μm Pt wire embedded into a polytetrafluoroethylene tube and an ITO glass slide were employed as the micro-counter electrode and the substrate, respectively. A slow deposition rate in the μ-EPD process was preferable to form a high quality micro-deposit consisting of a three-dimensional periodic polystyrene array. Under the optimized μ-EPD conditions, three-dimensionally ordered polystyrene particles were deposited in front of the micro-counter electrode. This micro-deposit constructed from polystyrene particles with a close-packed structure showed a characteristic optical absorption peak due to Bragg’s law.
Authors: Jun Ichi Hamagami, Kazuhiro Hasegawa, Kiyoshi Kanamura
Authors: Jun Ichi Hamagami, Atsushi Goto, Kiyoshi Kanamura, Takao Umegaki
Authors: Jun Ichi Hamagami, Kazuhiro Hasegawa, Kiyoshi Kanamura
Authors: Kiyoshi Kanamura, Takao Umegaki, Katsunori Toyoshima, Ken-Ichi Okada, Yukiya Hakuta, Tadafumi Adschiri, Kunio Arai
Authors: Jun Ichi Hamagami, Takashi Nakajima, Kiyoshi Kanamura, Takao Umegaki
Authors: Hirokazu Munakata, Hiroya Kaido, Kazuomi Yoshima, Kiyoshi Kanamura
Abstract: A polymer wall was developed between interdigitated comb-type current collectors on a SiO2/Si substrate as the support for three-dimensionally (3D) accurate deposition of electrode materials by electrophoretic deposition (EPD) method. As anode and cathode materials, Li4Ti5O12 and LiCoO2 with a particle size of ~ 200 nm were synthesized, respectively, and their dispersibility in the suspensions including Ketjen Black and poly (vinylidene fluoride) was investigated. Consequently, N-methylpyrrolidone provided their good suspensions, and an electrode aspect ratio of 1:1, which can provide a high capacity and good rate performance to micro lithium-ion batteries, was successfully achieved in both Li4Ti5O12 composite anode and LiCoO2 composite cathode.
Authors: Hirokazu Munakata, Suguru Omori, Kiyoshi Kanamura
Abstract: Anode for direct methanol fuel cell (DMFC) was fabricated on Nafion 117 membrane by electrophoretic deposition (EPD) method. An ethanol suspension containing Pt-Ru/C and Nafion ionomer was utilized, in which Pt-Ru/C and Nafion ionomer formed composite particles. The prepared electrode was tightly attached to the membrane without mechanical pressing and heat treatment. The electrode composition, i.e., the ratio between Pt-Ru/C and ionomer in the electrode, was controllable by Nafion content in the suspension, and strongly influenced on the DMFC performance. Accordingly, the anode with ionomer fraction of 26% exhibited the highest performance, which was more than twice as high as the performance attained in a standard electrode fabrication (hot press method).
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