Papers by Author: Takeshi Yao

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Authors: C.D. Song, Yu Hou Wu, Masashi Suezawa, F. Nishiyama, Hiroshi Katayama-Yoshida, Takeshi Yao
297
Authors: Naoshi Ozawa, Yoshihiro Ideta, Takeshi Yao, Tadashi Kokubo
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Authors: Naoshi Ozawa, Yoshihiro Ideta, Takeshi Yao, Tadashi Kokubo
127
Authors: Seiji Yamaguchi, Takeshi Yabutsuka, Mitsuhiro Hibino, Takeshi Yao
Abstract: Apatite pattern was prepared by electrophoretic deposition (EPD) transcribing resist pattern. A porous polytetrafluoroethylene (PTFE) film was used as a substrate and attached on a cathode. The cathode for EPD was stainless plate with resist pattern. EPD was performed with a suspension of wollastonite particles in acetone and wollastonite particles were deposited on the substrate in the form of the resist pattern. When the wollastonite-deposited substrate was soaked in simulated body fluid (SBF), apatite was induced and then replaced wollastonite at the wollastonite deposited region on the substrate. As a result, apatite was formed in the pattern that traced the resist pattern. The minimum line width of the apatite pattern was about 100 µm.
659
Authors: Seiji Yamaguchi, Takeshi Yao
Abstract: Electrophoretic deposition (EPD) was applied to forming apatite pattern. A pattern of holes was formed on a polytetrafluoroethylene (PTFE) board and a porous PTFE film was superposed on the PTFE board. Wollastonite particles were deposited on the PTFE film by EPD and wollastonite pattern was obtained. Then apatite was induced at the wollastonite deposited region by soaking in a simulated body fluid.
271
Authors: Naoshi Ozawa, Yoshihiro Ideta, Keiko Shimizu, Takeshi Yao
67
Authors: Hidetaka Okada, Seiji Yamaguchi, Mitsuhiro Hibino, Takeshi Yao, Shin Hasegawa, Masashi Neo, Takashi Nakamura
Abstract: Apatite micropattern was fabricated by a combination of biomimetic process and transcription of resist pattern. We optimized some fabrication conditions such as the height of resist pattern, temperature, concentrations and pH of simulated body fluid(SBF). Consequently, we successfully obtained apatite micropattern widely and homogeneously on a substrate in a short fabrication period.
663
Authors: Seiji Yamaguchi, Takeshi Yao
Abstract: Alumina is excellent biomaterial and used in hip prostheses, dental implants and so on. Wollastonite particles were deposited in pores of porous alumina by electrophoretic deposition and an alumina-wollastonite composite was produced. Apatite was formed both inside the pores and on the surface of the composite of the alumina-wollastonite composite by soaking in a simulated body fluid. It was indicated that the deposited wollastonite particles induced the apatite formation. Novel composite material with both excellent mechanical properties and high bioactivity was developed.
863
Authors: Koji Sato, Daisuke Onodera, Mitsuhiro Hibino, Takeshi Yao
Abstract: Poly methyl methacrylate(PMMA) with mar resistant or poly ethtylene(PE) substrates were surface-treated by applying plasma discharge or alkaline solution. Ceramic thin film comprised of silicon oxide, titanium oxide and zirconium oxide was formed on these surface treated substrates respectively from an aqueous solution, and after the formation of ceramic thin film, titanium oxide thin film was also coated on them from aqueous solution at ordinary temperature and pressure. The thin film coated polymer material was tested in mechanical property. The thin film was hard and the adhesion strength to the organic polymer substrate was very high. The substrate was soaked in SBF and apatite was formed on the substrate. This method is promising for developing hard and soft tissue implants with various mechanical properties as well as high bioactivity.
771
Authors: Takeshi Yabutsuka, Seiji Yamaguchi, Mitsuhiro Hibino, Takeshi Yao
Abstract: By electrophoretic deposition, wollastonite particles were deposited in pores of porous ultrahigh molecular weight polyethylene (UHMWPE). The UHMWPE-wollastonite composite thus fabricated was soaked in a simulated body fluid. As a result, apatite was formed inside the pores as well as on the surface of the UHMWPE-wollastonite composite. The formed apatite showed high adhesive strength to the composite.
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