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期刊论文
Modification of nano-TiO2 by Ai2O3 in-situ coating①
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A hovel technology of in-situ coating Al2 03 on the surface of H4 TiO4 was developed to prevent the aggregation of nano-TiO2 powders and improve the dispersibility and thermal stability in the way of form ing a uniform coating layer. The heterogeneous nucleation was conducted to prepare the precursor of nano-TiO2 and then AI2Os was coated on the surface of precursor. The effects of Al2O3 in-situ coating on the properties of nano-Ti02 were investigated. The results show that H4Ti04 can be dispersed well under alkaline condition (PH 8.5) and the heterogeneous nucleation can be ontrolled easily. The optimized uniform coating layer is obtained by adding 5 (mass fraetion)and 10 of AI2O3 and the aggregation of nano-TiO2 powders is effectively inhibited and the dispersibility isobviously improved. The erystal sizes of TiO2 powders are 12.3, 11.4 and 8.7 nm after coating 0.5 and 10 of Al2O3 respectively. AI2 O3 on the surface of particulates in amorphous phase could increase the thermal stability of nano-partieles after calcined at 550℃.
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