自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 13    No. 1    February 2006

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Modification of nano-TiO2 by Al2O3 in-situ coating
CHAI Li-yuan(柴立元), SU Wei-feng(苏维丰), PENG Bing(彭 兵),
WANG Yun-yan(王云燕),
WEI Shun-wen(韦顺文), YUAN Chun(苑 春), YU Yan-fen(于延芬), HAO Yun(郝 赟)

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:A novel technology of in-situ coating Al2O3on the surface of H4TiO4was developed to prevent the aggregation of nano- TiO2 powders and improve the dispersibility and thermal stability in the way of forming a uniform coating layer. The heterogeneous nucleation was conducted to prepare the precursor of nano- TiO2 and then Al2O3 was coated on the surface of precursor. The effects of Al2O3in-situ coating on the properties of nano- TiO2 were investigated. The results show that H4TiO4 can be dispersed well under alkaline condition (pH 8.5) and the heterogeneous nucleation can be controlled easily. The optimized uniform coating layer is obtained by adding 5% (mass fraction ) and 10% of Al2O3 and the aggregation of nano- TiO2 powders is effectively inhibited and the dispersibility is obviously improved. The crystal sizes of TiO2 powders are 12.3, 11.4 and 8.7 nm after coating 0, 5% and 10% of Al2O3 respectively. Al2O3 on the surface of particulates in amorphous phase could increase the thermal stability of nano-particles after calcined at 550℃.

 

Key words: in-situ coating; nano-TiO2; aggregation; dispersibility; thermal stability

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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