4.6 Article

Strong light scattering in macroporous TiO2 monoliths induced by phase separation

Journal

APPLIED PHYSICS LETTERS
Volume 85, Issue 23, Pages 5595-5597

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.1823596

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Macroporous titania (TiO2) monoliths have been prepared from systems containing titania colloid and poly(ethylene oxide) using a sol-gel method, and the light-scattering properties have been investigated by means of coherent backscattering. Three-dimensionally interconnected macroporous morphology is obtained by inducing the phase separation parallel to the sol-gel transition. The crystal structure of TiO2 gel is transformed from anatase to rutile through the heat treatment above 900 degreesC, while the macroporous morphology remains unchanged. We show that the rutile-type TiO2-based macropurous monoliths are strongly scattering media for visible light. (C) 2004 American Institute of Physics.

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