| Modification of nano-TiO2 by Al2O3 in-situ coating |
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| 作者姓名： | 柴立元 苏维丰 彭兵 王云燕 韦顺文 苑春 于延芬 郝赟 |
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| 作者单位： | School of Metallurgical Science and Engineering Central South University Changsha 410083 China，School of Metallurgical Science and Engineering Central South University Changsha 410083 China，School of Metallurgical Science and Engineering Central South University Changsha 410083 China，School of Metallurgical Science and Engineering Central South University Changsha 410083 China，School of Metallurgical Science and Engineering Central South University Changsha 410083 China，School of Metallurgical Science and Engineering Central South University Changsha 410083 China，School of Metallurgical Science and Engineering Central South University Changsha 410083 China，School of Metallurgical Science and Engineering Central South University Changsha 410083 China |
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| 基金项目： | Project（04GK2007） supported by Hunan Industrial Key Project of Science and Technology |
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| 摘 要： | A novel technology of in-situ coating Al2O3 on the surface of H4TiO4 was 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 Al2O3 in-situ coating on the properties of nano-TiO2 were investigated. The results show that H4 TiO4 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-partieles after calcined at 550℃.
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| 关 键 词： | 分散能力 纳米材料 二氧化钛 涂层 热稳定性 氧化铝 |
| 文章编号： | 1005-9784（2006）01-0017-05 |
| 收稿时间： | 2005-07-28 |
| 修稿时间： | 2005-09-26 |
Modification of nano-TiO2 by Al2O3 in-situ coating |
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| CHAI Li-yuan,SU Wei-feng,PENG Bing,WANG Yun-yan,WEI Shun-wen,YUAN Chun,YU Yan-fen,HAO Yun.Modification of nano-TiO2 by Al2O3 in-situ coating[J].Journal of Central South University of Technology,2006,13(1):17-21. |
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| Authors: | CHAI Li-yuan SU Wei-feng PENG Bing WANG Yun-yan WEI Shun-wen YUAN Chun YU Yan-fen HAO Yun |
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| Abstract: | |
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| Keywords: | in-situ coating nano-TiO2 aggregation dispersibility thermal stability |
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