Department of Physics, Faculty of Science, Kyoto Sangyo University
Department of Physics, Faculty of Science, Kyoto Sangyo University
Department of Physics, Faculty of Science, Kyoto Sangyo University
Department of Physics, Faculty of Science, Kyoto Sangyo University
Department of Physics, Faculty of Science, Kyoto Sangyo University
Okayama Laboratory, Tayca Corporation
Department of Innovative and Engineered Materials, Tokyo Institute of Technology
Japan Space Forum
出版者
宇宙航空研究開発機構宇宙科学研究本部
出版者（英）
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)
雑誌名
宇宙利用シンポジウム
雑誌名(英)
Space Utilization Research: Proceedings of Space Utilization Symposium
The Twenty-fifth Space Utilization Symposium (January 14-15, 2009: ISAS/JAXA Sagamihara, Japan)
抄録（英）
Colloidal crystals can be formed of silica particles while those of titania particles are not known under the normal gravitational field, because of their high specific gravity. We found by the Kikuchi-Kossel diffraction technique that, when silica particles (diameter 170 nm; density 2.2 g/cm3) are mixed with titania particles (diameter 127 nm; density 3.9 g/cm3), colloidal crystals are formed. Colloidal crystals started out with bcc structure and changed to fcc structures after about 60 days. Transitions began from the bottom of the container. Thus, the transitions are considered to be due to gravitational sedimentation. It is significant that the crystal growth process, which has not been observed in one-component dispersions of the silica particles, was found using titania particles with a wide range of the practical applicability.
シリカ粒子とチタニア粒子の混合系におけるシリカコロイド結晶の重力沈降効果
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