Effect of La^(3+) on evolution of TiO_2 coating layers on lamellar sericite and their pigmentary properties  

作　　者：任敏 殷恒波 卢章准 葛晨 王爱丽 喻龙宝 姜廷顺 

机构地区：[1]Faculty of Chemistry and Chemical Engineering , Jiangsu University

出　　处：《中国有色金属学会会刊：英文版》2009年第3期626-634,共9页Transactions of Nonferrous Metals Society of China

基　　金：Project(2003406) supported by the Chinese Education Department;Project(BG2006025) supported by Bureau of Science and Technology of Jiangsu Province, China

摘　　要：TiO2-coated sericite powders were prepared by the chemical deposition method starting from lamellar sericite and TiCl4 in the presence of La3+. After calcination at 900 ℃ for 1 h, the resultant TiO2 nanoparticles on the sericite surfaces exist in anatase phase. The light scattering indexes of the TiO2-coated lamellar sericite powders are dozens of times higher than those of the naked lamellar sericite powders, varying with different contents of La3+. The presence of La3+ in the deposition solution is beneficial to the formation of the small-sized anatase TiO2 nanoparticles. The presence of La3+ also favors the formation of the dense and uniform island-like TiO2 coating layers in a large range of the mass ratio of TiO2 to sericite from 5% to 20%. XPS analysis shows that when La3+ is absent in the reaction solution, TiO2 coating layers anchor on the sericite surface via Ti—O—Si and Ti—O—Al bonds. The presence of La3+ causes the formation of Si—O—La and Al—O—La bonds on the sericite surface and Ti—O—La bond on the surface of TiO2 coating layers.TiO2-coated sericite powders were prepared by the chemical deposition method starting from lamellar sericite and TiCl4 in the presence of La3＋. After calcination at 900 ℃ for 1 h, the resultant TiO2 nanoparticles on the sericite surfaces exist in anatase phase. The light scattering indexes of the TiO2-coated lamcllar sericite powders are dozens of times higher than those of the naked lamellar sericite powders, varying with different contents of La^3＋. The presence of La^3＋ in the deposition solution is beneficial to the formation of the small-sized anatase TiO2 nanoparticles. The presence of La^3＋ also favors the formation of the dense and uniform island-like TiO2 coating layers in a large range of the mass ratio of TiO2 to sericite from 5% to 20%. XPS analysis shows that when La^3＋ is absent in the reaction solution, TiO2 coating layers anchor on the sericite surface via Ti--O--Si and Ti---O---Al bonds. The presence of La^3＋ causes the formation of Si--O--La and Al--O--La bonds on the sericite surface and Ti--O---La bond on the surface of TiO2 coating layers.

关 键 词：二氧化钛涂层 绢云母粉编 色素 纳米粒子 镧 

分 类 号：TG174.4[金属学及工艺—金属表面处理]