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《Journal of East China University of Science and Technology(Natural Science Edition)》 2007-04
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Preparation and Properties of Zirconia-Coated Silica Nanoparticles

YUAN Qiao-long,ZHOU Feng-hua,WU Shu-sen(Key Laboratory for Ultrafine Materials of Ministry of Education,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China)  
Three monodispersed,stable spherical silicas in nanosize were prepared from water glass.The zirconium n-tetrabutanoxide in isopropanol was added into the aqueous silica dispersion and hydrolysed to zirconic acid,and then directionally adsorbed and condensablely polymerized on the surface of the silica by control of pH and the concentration of the tetrabutyl zirconate.The results of TEM,EDS,ζ-potential and surface charge of nanoparticles in terms of Gouy-Chapman model show that the zirconia are coated onto the surface of silica nanoparticles,and the coverage is 57%.The UV-vis analysis indicates that ultraviolet absorption of the zirconia-coated silica dispersion is declined with increase of the nanoparticle size,and the visible transmittance of the dispersion is also lost slightly.The zirconia-coated silica powders are obtained by spray dryer,and the specific surface area of the powder is 135 m~2/g.The XRD patterns denote that there is a little monoclinic phase of the zirconia in the powder.After calcined at 600 ℃ and 1 300 ℃,the specific surface areas are 100.5 m~2/g and 67.3 m~2/g,and structures of the powder are monoclinic phase and tetragonal phase,respectively.
【Fund】: 国家自然科学基金项目(50073005)
【CateGory Index】: TB383.1
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