Preparation of titania-silica cryogels with controlled shapes and photocatalysis through unidirectional freezing

Hirotomo Nishihara, Shin R. Mukai, Seiji Shichi, Hajime Tamon

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Homogeneous titania-silica binary hydrogels were molded into various shapes, microhoneycomb, self-standing bundle, microfibers, and powder, by a unidirectional freezing method. Moreover, by freeze-drying the unidirectionally frozen samples, the honeycomb walls or microfibers obtained were converted into mesoporous cryogels which possessed considerable high surface areas (up to 1057 m2 g- 1) and large mean pore diameters of 2-6 nm. Thanks to the high porosity and well-dispersed titania, the titania-silica binary cryogels exhibited very high photocatalytic activity in the decomposition of salad oil under ultraviolet irradiation.

Original languageEnglish
Pages (from-to)959-961
Number of pages3
JournalMaterials Letters
Volume64
Issue number8
DOIs
Publication statusPublished - 2010 Apr 30

Keywords

  • Aerogels
  • Microstructure
  • Photocatalyst
  • Self-assembly
  • Sol-gel preparation
  • Template synthesis

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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