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Facile Preparation of Hierarchically Porous TiO 2 Monoliths
Author(s) -
Hasegawa George,
Kanamori Kazuyoshi,
Nakanishi Kazuki,
Hanada Teiichi
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.03831.x
Subject(s) - anatase , mesoporous material , chemical engineering , monolith , materials science , porosity , solvent , hydrothermal circulation , sol gel , amorphous solid , salt (chemistry) , fabrication , macropore , nanotechnology , catalysis , chemistry , organic chemistry , composite material , photocatalysis , medicine , alternative medicine , pathology , engineering
Monolithic titania (TiO 2 ) with multiscale porous structures have been successfully prepared via the sol–gel route accompanied by phase separation utilizing a chelating agent and mineral salt. The TiO 2 gels obtained possess well‐defined macropores derived from spinodal decomposition and mesopores as interstices of anatase TiO 2 nanocrystallites. Most of the chelating agent were removed by hydrolysis and subsequent decarbonation through the gradual solvent exchange from ethanol to water. The TiO 2 particles comprising TiO 2 gel skeletons spontaneously converted from amorphous to anatase through the solvent exchange process in a mild condition at 60°C. The present method of the fabrication of porous TiO 2 monoliths is advantageous for widespread applications because the reaction occurs under an almost neutral condition and does not require a hydrothermal process, which was indispensable to strengthen the monolith in the method previously reported.