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Preparation of Silica Sols and Anti-Reflective Films with Electrostatic Self-Assembly Multilayer Method
Xu Pichi*,Jiang Desheng,Yu Haihu,Li Xiaofu,Li Honghui
Author NameAffiliationE-mail
Xu Pichi* The Department of MaterialSouthwest University of Science and TechnologyMianyang 621010 xupichi54@163.com 
Jiang Desheng Fiber Optic Sensing Technology Research CenterWuhan University of TechnologyWuhan 430070  
Yu Haihu Fiber Optic Sensing Technology Research CenterWuhan University of TechnologyWuhan 430070  
Li Xiaofu Fiber Optic Sensing Technology Research CenterWuhan University of TechnologyWuhan 430070  
Li Honghui Fiber Optic Sensing Technology Research CenterWuhan University of TechnologyWuhan 430070  
Abstract:
Silica sols were prepared by hydrolysis of Si(OC2H5)4(TEOS)using HCl,NH3·H2O,HCl/NH3·H2O as catalyzers,and the different granularities of SiO2 sols which catalyzed by HCl first and then NH3·H2O have the same terminal pH value were prepared. The silica colloidal particles were investigated with Transmission Electron Microscope(TEM). The results showed sol catalyzed by HCl possesses very little particle,catalyzed by NH3·H2O has particle configuration,catalyzed by HCl/NH3·H2O possesses consecutive configuration. Poly(diallyldimethylammonium chloride)(PDDA)and SiO2 nanoparticulate complex thin films were prepared by electrostatic self-assembly multiplayer(ESAM)method. After assembling films,thin films surface conformation was observed with Electron Microscope and their transmittance was tested with 721 Spectrophotometer. The results showed that the silica sol catalyzed with HCl is not good for the fabrication of ESAM films and the silica sol catalyzed with HCl first and then NH3·H2O or by NH3·H2O only are very suitable for ESAM film fabrication. TEM data indicate that the microstructure of PDDA/ SiO2 prepared from silica sol catalyzed with HCl first and then NH3·H2O is consecutive and that the microstructure of PDDA/ SiO2 prepared from silica sol catalyzed by NH3·H2O only is particulate-parking like. The dependence of the transmittance of assembled films on the bilayer number of the films and the anti-scratching properties of the films were investigated. The results show that PDDA/ SiO2 films prepared from silica sol catalyzed by NH3·H2O only possess higher transmittance but lower anti-scratching properties. The effect of granularity of sols on optical performances of the thin films was studied,results showed the less the granularity of sol,the better the optical performances. For the sake of improving the light transmittance of films,we can reduce the granularity of sol,but it may play down its mechanical damage resist intensity.
Key words:  SiO2,Sol,Electrostatic self-assembly multilayer,Complex film
FundProject:
SiO2溶胶及其静电自组装薄膜的制备
许丕池*,姜德生,余海湖,李小甫,李鸿辉
摘要:
采用HCl催化、NH3·H2O催化、HCl与NH3·H2O分步催化三种途径制备了SiO2胶体,用透射电镜观察了胶体粒子的形貌. 用静电自组装(ESAM)法制备了聚电解质PDDA与SiO2胶体粒子的有机/ 无机复合光学薄膜. 实验结果表明,用HCl 催化制备的SiO2透明溶胶不适合于用ESAM法制备薄膜,用HCl与NH3·H2O分步催化以及用NH3·H2O单独催化制备的SiO2胶体适合于用ESAM法制备光学薄膜. 薄膜的透射电镜微观察结果表明,以HCl与NH3·H2O分步催化的SiO2胶体制备的PDDA/SiO2薄膜为连续结构,NH3·H2O单独催化的为颗粒堆积. 研究了薄膜透光率与薄膜层数的关系,考察了薄膜的机械强度. 结果显示,以NH3·H2O单独催化的SiO2胶体制备的光学薄膜的增透效果较好,但耐机械擦伤强度较弱.
关键词:  SiO2  溶胶  静电自组装  复合薄膜
DOI:10.1088/1674-0068/17/2/165-170
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