Synthesis of TiO2 photocatalysts in supercritical CO2 via a non-hydrolytic route

Article Abstract:

Nanoscaled TiO2 powders with narrow size dispersion are prepared in supercritical carbon dioxide via non-hydrolytic acylation/deacylation of titanium alkoxide precursors with or without tris-fluorination. Calcined TiO2 prepared from titanium(IV) isoprepoxide and trifluoroacetic anhydride is effectively dispersed in aerated supercritical carbon dioxide under stirring and exhibited high photocatalytic oxidation activity.

Science & research, Industrial Gas Manufacturing, Industrial gases, Carbon Dioxide, Research, Oxidation-reduction reaction, Oxidation-reduction reactions

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Ultraviolet light-induced hydrophilicity effect on TiO(sub 2)(110)(1x1): Dominant role of the photooxidation of adsorbed hydrocarbons causing wetting by water droplets

Article Abstract:

The UV photoproduction of a hydrophilic TiO(sub 2)(110)(1x1) surface is investigated in a pressurized ultrahigh vacuum apparatus under controlled conditions of hydrocarbon concentration in oxygen gas at 1 atm pressure. Result show that when low partial pressures of hexane are present, the sudden onset of surface wetting occurs during UV irradiation after an induction period under photooxidation conditions.

Analysis, Irradiation, Optical properties, Hydrocarbons, Irradiation (Radiation exposure)

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