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SYNTHESIS AND MICROSTRUCTURE OF A NOVEL TiO2 AEROGEL–TiO2
YOSHIKAZU SUZUKI,MARIE-HÉLÈNE BERGER,DANIELA D'ELIA,PIERRE ILBIZIAN,CHRISTIAN BEAUGER,ARNAUD RIGACCI,JEAN-FRANÇOIS HOCHEPIED,PATRICK ACHARD 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2008 NANO Vol.3 No.5
TiO2 aerogel–10 mol% TiO2 nanowire composite was prepared by a sol–gel technique with the addition of TiO2 nanowires to TiO2 sol, followed by supercritical drying in CO2. TiO2 nanowires (anatase with minor rutile phases) as dispersoid were prepared by a hydrothermal process followed by calcination in air at 600°C. The TiO2 nanowires were dispersed in a 2-propanol/H2O/HNO3 solution, and the mixture was added drop by drop to a tetrabutyl orthotitanate [i.e. Ti (IV) n-butoxide] solution in 2-propanol. After gelation, the TiO2 alcogel–TiO2 nanowire composite was dried in supercritical CO2 to obtain the final, TiO2 aerogel–TiO2 nanowire composite. TEM analysis revealed that a unique "nanowire network" structure was formed withinthe mesoporous aerogel matrix. The aerogel–TiO2 nanowire composite had a relatively large surface area 427 m2/g, with mesopores ~ 16 nm in diameter and a pore of volume of 1.63 cm3/g.