多孔TiO_2/SiO_2复合薄膜的制备及其超亲水性机理  

Preparation and superhydrophilic mechanism of porous TiO_2/SiO_2 composite thin film

作　　者：杨春晓[1] 黄洪[1] 黄涛[1] 司徒粤[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640

出　　处：《应用化工》2013年第7期1174-1179,共6页Applied Chemical Industry

基　　金：国家自然科学基金青年科学基金(51103045)

摘　　要：采用溶胶-凝胶法,以钛酸四丁酯和正硅酸乙酯为前驱体,利用乙酰丙酮和二乙醇胺为络合剂,制备多孔TiO2/SiO2复合薄膜。通过扫描电子显微镜(SEM)、原子力显微镜(AFM)、傅里叶变换红外光谱(FTIR)、X射线衍射分析(XRD)、接触角测试仪(WCA)等对薄膜的结构和性能进行了表征。结果表明,TiO2/SiO2复合薄膜表面相对孤立或连通的孔结构是由缩聚反应诱导的相分离以及溶胶-凝胶转化过程同步作用产生的。多孔复合薄膜具有优异的超亲水性能,自然条件下与水接触角仅为2.5°,而普通致密TiO2薄膜在相同条件下接触角为19.3°。复合薄膜的超亲水性是由多孔结构和SiO2复合的共同作用产生,受到表面微观形貌和表面化学组成(羟基含量)的共同影响。A novel sol-gel method was developed to prepare porous superhydrophilic TiO2/SiO2 composite film using Ti（OC4H9）4 and Si（OC2H5）4 as precursors as well as using acetylacetone（AcAc） and diethanolamine（DEA） as complexing agents.The properties of the composite film were characterized by SEM,AFM,FTIR,XRD and WCA,and the formation mechanism of superhydrophilicity was discussed.The results showed that the appearance of isolated or interconnected macrospores on the composite films was ascribed to the polymerization-induced phase separation,together with the concurrent sol-gel transition.Porous TiO2/SiO2 composite film exhibited excellent superhydrophilicity（WCA = 2.5°） without UV irradiation,while the WCA of normal TiO2 film was 19.3° under the same condition.The natural superhydrophilicity was attributed to the combined effect of the porous structure and the addition of SiO2,which resulted in the change of surface morphology and surface chemical composition（especially hydroxyl content）,simultaneously.

关 键 词：TIO2 SiO2复合薄膜 多孔结构 相分离 超亲水性 羟基含量 

分 类 号：TQ134.1[化学工程—无机化工]