Macroporous titania system

Stein A., Schroden R.C. CoUoidal crystal templating of three-dimensionally ordered macroporous solids materials for photonics and beyond. Curr. Opin. Sohd State Mater. Sci. 2001 5 553-564 Subramania G., Constant K., Biswas R., Sigalas M.M., Ho K.M. Optical photonic crystals synthesized from colloidal systems of polystyrene spheres and nanocrystalhne titania. I. Lightwave Technol. 1999 17 1970-1974... 

Konishi, J., Fujita, K., Nakanishi, K., and Hirao, K. (2006) Phase-separation-induced titania monoliths with well-derived macropores and mesostructured framework from colloid-derived sol-gel systems. Chem. Mater., 18, 864-866. 

This method allows independent control over both the macropores, which are determined by the emulsion droplets in the first step of the process, and the mesopores, by the supramolecular self-assembly in the second step. Therefore, the two templating systems do not interfere vhth each other, and consequently the meso-and macro-structures can be optimized separately [21]. Inorganic oxides, such as silica, titania and zirconia, were obtained by this two-step process. The bimodal distribution of pores was characterized by highly ordered mesopores (5-10 nm) and by interconnected macropores (0.1 to 5 p,m). These materials possess high pore volumes (17 cm g ) and specific surface areas, as determined by the BET method applied to the nitrogen adsorption isotherm, of between 250 and 750 The... 

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