Strong light scattering in macroporous TiO2 monoliths induced by phase separation

Fujita, Koji; Konishi, Junko; Nakanishi, Kazuki; Hirao, Kazuyuki
December 2004
Applied Physics Letters;12/6/2004, Vol. 85 Issue 23, p5595
Academic Journal
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 °C, while the macroporous morphology remains unchanged. We show that the rutile-type TiO2-based macropurous monoliths are strongly scattering media for visible light.


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