多孔二氧化钛薄膜涂层的制备和双亲性质研究

二氧化钛因其具有光催化等性能而备受关注 1] .其薄膜材料在紫外光的照射下 ,能产生活泼自由基 ,自由基能分解有机化合物 ,具有杀菌和自清洁作用 ;同时在紫外光照射时也能诱导材料产生超双亲特性 (油或水在其表面的接触角为 0°) ,赋予材料许多重要的应用 2～ 4 ] .但二氧化钛薄膜材料表面的超双亲特性在停止紫外光照射后逐渐变弱 ,接触角也随放置时间的增加而增加 5] .因此需要制备一种不需紫外光照射就具有永久双亲性能的薄膜涂层 .近期的研究表明 ,一些具有孔结构的薄膜涂层具有永久的双亲性能 ,该性能是由涂层本身的多孔性和平均孔尺…

Preparation and Amphiphilicity of Macroporous Titania Coating

Wettability is a fundamental property of solids surface, which is governed by both their chemistry and surface morphology. Titania is an interesting semiconductor, whose surface can display supra-amphiphilicity after being irradiated by UV light. This property leads to many attractive potential applications. Howerer, this property gradually loses upon the cessation of the irradiation. It is urgently required to fabricate a titania surface with amphiphilic property, independent on UV light irradiation. Herein, we propose to achieve an amphiphilic titania coating with macropores by dip-coating titania/polymer capsule dispersion followed by the removal of the polymer cores. The porous coating is permanently amphiphilic independent on UV irradiation, which is significantly different from the bulk ones. The amphiphilicity of the porous coating is greatly enhanced up to supra-amphiphilicity by a proper dose of UV irradiation similar to the thin film. Since the size is less than 100 nm, visible light scattering is avoided and the porous coating is transparent. Anatase titania coating with the pores retained is achieved after being calcined at 450 ℃, meanwhile adhesion of the coating on the substrates becomes stronger. The features of the porous coating facilitate its potential applications.