采用多层自组装技术在Al2O3微滤膜表面制备TiO2纳米涂层,并利用1H,1H,2H,2H-全氟辛基乙基三乙氧基硅烷(PFDS)对其表面进行氟化处理,获得超疏水改性膜.通过X射线衍射仪,傅立叶变换红外光谱仪,原子力显微镜,水接触角测试仪和扫描电子显微镜对改性膜进行表征.分析了TiO2纳米涂层的晶型结构,探讨了TiO2沉积时间与改性膜表面粗糙度和疏水性之间的关系,研究了PFDS改性次数对膜表面形貌和疏水性能的影响规律.结果表明:在600℃退火1h后,获得锐钛矿结构的TiO2纳米涂层.随TiO2沉积时间的延长,膜表面粗糙度增大,水滴在膜表面的接触由Wenzel状态转变为Cassie状态;当TiO2沉积时间为50 min,PFDS改性3次时,获得理想的微纳米二级超疏水表面形貌,水接触角达到174.5°.
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