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Assembling of nanoparticles using ice crystals

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Title: Assembling of nanoparticles using ice crystals
Authors: Mukai, Shin R. Browse this author →KAKEN DB
Mitani, Kazuhiro Browse this author
Murata, Shinya Browse this author
Nishihara, Hirotomo Browse this author
Tamon, Hajime Browse this author
Keywords: Microporous materials
Sol-gel growth
Adsorption
Microstructure
Issue Date: 1-Oct-2010
Publisher: Elsevier B.V.
Journal Title: Materials Chemistry and Physics
Volume: 123
Issue: 2-3
Start Page: 347
End Page: 350
Publisher DOI: 10.1016/j.matchemphys.2010.05.025
Abstract: This article introduces a method to assemble nanoparticles into the form of fibers and monolithic microhoneycombs using unidirectional freezing. The nanoparticles used were of TiO2, high SiO2 Y-type zeolite, and graphite. A silica hydrogel was used as the binder, and an array of needle-shaped ice crystals formed during the unidirectional freezing of the particle-hydrogel complex was used as the template. It was found that such particle-hydrogel complexes can be easily molded into the form of fibers and monolithic microhoneycombs like hydrogels which do not include particles. The morphology can be changed by adjusting the firmness of the silica hydrogel. The strength of the microhoneycombs was found to decrease with the inclusion of nanoparticles, but could be recovered through calcination. The fibers and monolithic microhoneycombs are expected to have the combined functions of the particles and binder included within them. They are also equipped with a network of nanopores and macropores which reach to the surface of the nanoparticles, therefore various fluids can gain access to the surface of the nanoparticles quite easily. Due to this high accessibility, it is expected that the included nanoparticles can show their maximum performances.
Type: article (author version)
URI: http://hdl.handle.net/2115/43933
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 向井 紳

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