Preparation of SiO_2/TiO_2 Janus particles by electrostatic assembly,hydrolysis and calcination  

作　　者：Baoliang Zhang Qiuyu Zhang Hepeng Zhang Xinlong Fan Dezhong Yin Xiangjie Li Wei Li 

机构地区：[1]Department of Applied Chemistry,College of Science,Northwestern Polytechnical University

出　　处：《Particuology》2013年第5期574-580,共7页颗粒学报（英文版）

基　　金：support provided by the National Basic Research Program of China(2010CB635111);the National Natural Science Foundation of China(No.51173146,NO.51173147);the Key Project of Space Foundation(CASC201106);the Doctorate Foundation of Northwestern Polytechnical University(CX201210);the Graduate Starting Seed Fund of Northwestern Polytechnical University(Z2012158);the Basic Research Fund of Northwestern Polytechnical University(JC20120248)

摘　　要：This paper describes a novel chemical method for preparing SiO2/TiO2 Janus particles. First, polystyrene （PSt）/SiO2 particles with a raspberry-like structure are prepared by electrostatic assembly. The influences of the reaction time of sulfonation and the treatment times of polyelectrolyte solutions （PDADMAC, PSS） on PSt and SiO2 are investigated with respect to the surface charge density of the particles. SiO2/TiO2 Janus particles are then obtained by hydrolysis of butyl titanate on the surface of PSt/SiO2 particles followed by a calcination process. Particle size analyzer, Zeta potential instrument, FTIR, TEM and SEM are used to characterize the particle size, the amount of charge on the surface of PSt and SiO2 particles and the compositions and morphologies of PSt/SiO2, SiO2/Ti02 and PSt/SiO2/Ti02. The diameters of the PSt, SiO2, PSt/Si02 and SiO2/Ti02 particles are 2.0 t^m, 303 nm, 2.7 bcm and 330 nm, respectively.This paper describes a novel chemical method for preparing SiO2/TiO2 Janus particles. First, polystyrene （PSt）/SiO2 particles with a raspberry-like structure are prepared by electrostatic assembly. The influences of the reaction time of sulfonation and the treatment times of polyelectrolyte solutions （PDADMAC, PSS） on PSt and SiO2 are investigated with respect to the surface charge density of the particles. SiO2/TiO2 Janus particles are then obtained by hydrolysis of butyl titanate on the surface of PSt/SiO2 particles followed by a calcination process. Particle size analyzer, Zeta potential instrument, FTIR, TEM and SEM are used to characterize the particle size, the amount of charge on the surface of PSt and SiO2 particles and the compositions and morphologies of PSt/SiO2, SiO2/Ti02 and PSt/SiO2/Ti02. The diameters of the PSt, SiO2, PSt/Si02 and SiO2/Ti02 particles are 2.0 t^m, 303 nm, 2.7 bcm and 330 nm, respectively.

关 键 词：Janus particlesElectrostatic assemblyHydrolysisCalcination 

分 类 号：O611.3[理学—无机化学]