Papers by Author: Masahiko Tajika

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Authors: Masahiko Tajika, Hideaki Matsubara, William Rafaniello
Authors: Mitsuhiko Ohta, Masahiko Tajika, Atsushi Nakahira
Abstract: In this study, porous hydroxyapatite (HAp) bodies were prepared by the simple process. We fabricated porous fibers consisting of polyacrylonitrile (PAN) and HAp by an extrusion method of the mixture of PAN and HAp in dimethylformamide (DMF) solution. Fibers obtained by this extrusion method were chopped and molded. Subsequently, these compactions from chopped fibers consisting of HAp and PAN were sintered at various temperatures in air atmosphere. The sintered HAp bodies had high porosity and a number of pores with diameter some hundreds μm. These porous HAp bodies can be used as a scaffold in the body.
Authors: S. Takezoe, Kazuyuki Hosoi, Masahiko Tajika, Yuki Yamasaki, Atsushi Nakahira
Abstract: Synthesis of bulky Y-zeolite was attempted by a hydrothermal hot-pressing (HHP) method. These bulky products synthesized under hydrothermal conditions were identified as Y-zeolite single phase. Especially, bulky Y-zeolite having translucency, high density and large surface area was obtained by HHP treatment at 423K for 2h with 17wt% of 5M-NaOH solution. This solidified zeolite like single-crystal was considered to be made by dissolution and precipitation mechanism. High-density bulky zeolites can be expected as novel molecular sieves and catalysts with high activity.
Authors: Yoshihiro Hirata, Kouichi Nishikawa, Y. Fukushige, Masahiko Tajika
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