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22 January 2005 Fabrication of macroporous TiO2 monoliths for photonic applications
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Macroporous titania (TiO2) monoliths have been prepared by the sol-gel method including phase separation, and the light-scattering properties have been investigated by means of coherent backscattering. Macroporous TiO2 gels are obtained in the systems containing aqueous titania colloid and poly(ethylene oxide)(PEO). Threedimensionally interconnected macroporous structure is formed when the transient structure of phase separation is fixed as the permanent morphology by the sol-gel transition. The domain size of macroporous TiO2 gels can be controlled reproducibly by adjusting the concentration of PEO. During the heat treatment above 1000 °C, the TiO2 skeleton is sintered into fully dense body and the crystalline structure is transformed from anatase to rutile, while maintaining macroporous morphology. We show that the rutile-type TiO2 -based macroporous monoliths are strongly scattering media for visible light.
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Junko Konishi, Koji Fujita, Kazuki Nakanishi, and Kazuyuki Hirao "Fabrication of macroporous TiO2 monoliths for photonic applications", Proc. SPIE 5720, Micromachining Technology for Micro-Optics and Nano-Optics III, (22 January 2005);

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