Al_2O_3-SiO_2复合膜的疏水改性及表征  

Hydrophobic Modification and Characterization of Al_2O_3-SiO_2 Composite Membranes

作　　者：同帜[1] 胡敏盾 王赛[1] 李海红[1] 董旭娟[1] 

机构地区：[1]西安工程大学环境与化学工程学院,陕西西安710048

出　　处：《材料科学与工程学报》2014年第5期741-744,共4页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(21103132);陕西省科技厅统筹资助项目(2013KTCQ03-20);陕西省教育厅产业化培育资助项目(2013JC15)

摘　　要：采用溶胶-凝胶法制备Al2O3-SiO2复合薄膜,通过添加二甲基二乙氧基硅烷(DDS)对其进行疏水改性。研究了DDS添加量对复合溶胶体系稳定性和复合膜表面疏水性的影响,采用接触角测量、红外光谱(IR)、热重分析(TG-DTG)、原子力显微镜(AMF)对样品进行表征。结果表明,对于Al2O3∶SiO2(mol/mol)=1∶2比例下制得的复合膜,随着DDS的加入,薄膜表面疏水性明显增强,当DDS加入过多时,会影响复合溶胶的稳定性,实验确定DDS加入量的最佳值为1%(体积分数);DDS的加入没有破坏复合膜的网格结构,复合膜仍以SiO2颗粒为骨架;经200℃热处理后,可得到具有良好的疏水性能的复合膜。Al2O3-SiO2 composite membranes were prepared by a sol-gel method,in which diethoxydimethylsilane（DDS）was added to make the membranes hydrophobic.Effects of DDS content on the stability of composite sol and hydrophobicity of membranes were studied.The Al2O3-SiO2 composite membranes were characterized by thermal gravity analysis-differential thermal gravity（TG-DTG）,X-ray diffraction（XRD）and atomic force microscopy（AFM）.The results show that when the ratio of Al2O3∶SiO2（mol/mol）=1∶2,the hydrophobicity of composite membranes raises with the increase of DDS content.The optimal content of DDS is 1%（volume fraction）,while the composite sol is not stabile when DDS is too much.The grid structure with SiO2 particles as a skeleton of the composite membranes does not ruined after adding DDS.The composite membranes exhibit agood hydrophobicity after 200℃heat treatment.

关 键 词：Al2O3-SiO2复合膜 疏水改性 DDS 

分 类 号：X781.5[环境科学与工程—环境工程]