Abstract
The synthesis of a porous-type of TiO2 with rutile structure was studied. The focuses were on the thermal treatment temperature and time. AEROXIDE® TiO2 P 25, as a fumed TiO2, was thermally treated in a vertical-type tubular furnace by the natural dropping method. Even though the thermal treatment time was less than 1 s, a drastic increase of polymorphism from anatase structure to rutile structure was observed. The relationships between the rutile structure transformation ratio and surface area of obtained porous type of TiO2 were investigated depending on the thermal treatment temperature. The porous-type of fumed TiO2 showed high dispersibility in the sedimentation test although is showed large particle size.
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