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Nano Metal Materials

Abstract

In nano metal materials fields, the materials with unique properties generating in nanoscale have been focused on and developed. Nano materials have quite different characteristics compared with bulk materials in the same composition. Materials show the size effect and the quantum effect when being in nanoscale. As a typical property, the melting point of nano materials is hundreds degree lower than that of bulk materials. Also the conductive materials in bulk often change into semiconductor or insulator in nanoscale due to quantum effect.

金属ナノ材料 "Manufacturing inspired in nature" is the aim for our group. Therefore we are working on the development of synthetic techniques on the monodispersed functional nanoparticles and of their dispersion techniques in liquid. As an example, the clarification of synthetic process of nanoparticles has been focused using alcohol/polyol processes, which is an eco-friendly non-aqueous system. Based on the processes, we are establishing the precise processes for controlling the structures and the compositions of nanoparticles. As an application for metal nanoparticles ink, several elemental technologies such as well-crystallized single nanoparticles, well-stable for oxidation, and well-dispersed nanoparticles in a solvent, have been developed.

金属ナノ材料 現在、自給循環型白金ミニマム化合金微粒子触媒の創製、太陽光発電用酸化銅および硫化銅の合成技術開発およびGHz帯高周材料の開発など、様々な目的にあったナノ粒子の材料設計ならびに単分散ナノ粒子合成を行っている。

Bulk Metal Materials

Abstract

In bulk materials fields, hydrogen storing alloys have been developed. Recently a required storage pressure becomes higher than before, so there is a chance to be back in promising materials, which were considered as "unhandiness" materials in the past. Also electrical resistance materials and metal surface processing have been developed.

金属バルク材料 チタン・ニオブ・ジルコニウム等を主成分とする水素吸蔵合金について研究開発を行っている。特に、水素占有位置の形に注目し、特徴的な結晶構造を有する新規水素吸蔵合金について、平衡相・非平衡相を含む新規金属間化合物を中心に深索を行っており、従来吸蔵能力がひくいとされていた合金(例:Nb6Fef合金、図3)に、元素の置換や添加を行うことにより、水素解離圧を調製し、貯蔵タンク用新規水素吸蔵材料の開発を目指している。

Mesoscopic Inorganic Materials

Abstract

In mesoscopic materials fields, mesostructure designing has been performed taking advantage of chemical-physical interactions such as "Self-Assembly" and "Oriented Attachment". The structure has been controlled in solution process, such as "sol-gel method" and "hydrothermal synthesis". The unique properties of meso/macroscopic objects have been developed by arranging the shape and the orientation of nanoparticles and nanostructures.
As an example, fluorescence organic-inorganic nanocomposite materials have been developed using the specific interaction at the interface between luminescenct nanoparticles and inorganic matrix, for the solid-state lasing applications.

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