ZnO/TiO_2复合膜的制备及润湿性研究

Fabrication and Wettability of ZnO/TiO_2 Composite Films

采用溶胶凝胶法制备了ZnO/TiO_2复合膜,并通过XRD和SEM进行物相和形貌表征。经表面修饰低表面能物质1H,1H,2H,2H-全氟辛基三氯硅烷后,采用接触角测试仪对ZnO/TiO_2复合膜的润湿性进行分析,并研究了紫外光照射下TiO_2含量对ZnO膜润湿性转换的影响。结果表明,经紫外光照射30 min后,ZnO/TiO_2复合膜与水的接触角均降低,呈现由疏水向亲水转变的趋势,随着TiO_2含量的增加,ZnO/TiO_2复合膜润湿性转换速度增加,当TiO_2含量为7.5%的ZnO/TiO_2复合膜的润湿性转换速率达最大,由疏水性转变为超亲水性,继续增加Ti O_2含量至10%时,ZnO/TiO_2复合膜的润湿性转换速度有所降低。

ZnO/TiO2 composite films were fabricated through sol-gel method.The phases and surface morphologies of the ZnO/TiO2 films were characterized by XRD and SEM.The wettabilities of ZnO/TiO2 films were measured by a drop shape analyzer after being modified with the low surface energy material 1 H,1 H,2 H,2 H-perfluorooctyl trichloro silane.The effect of TiO2 content on the wettability of ZnO film under UV irradiation was investigated.The result demonstrated that the molar fraction of TiO2 loaded on ZnO film had a significant effect on the wettability conversion.The water contact angles of ZnO/TiO2 films reduced and the hydrophobility switched to hydrophicility after 30 min UV illumination.The wettability conversion of ZnO/TiO2 films accelerated with the increase of TiO2 content.A rapid switch of wettability occurred on the surface of ZnO/TiO2 composite with TiO2 content of 7.5%(molar fraction),which converted to superhydrophilic after 30 min UV illumination.With the TiO2 content increased to 10%,the conversion of wettability decelerated.