实验通过调节TiO2前驱体溶胶中水一醇的体积比(Vw:Ve)及涂膜时的环境温度,制备了一系列表面由不同尺寸粒子修饰的TiO2薄膜.薄膜表面的TiO2粒子沿袭了溶胶中分散粒子的特征.一方面,随着溶胶中Vw:Ve的增大,分散质点粒子的尺寸增大,而另一方面,随着温度的升高,溶胶中分散质点粒子因溶解度增大,尺寸呈现减小趋势.因此通过调节Vw:Ve 及涂膜时候的环境温度,可制备所期望尺寸粒子修饰的TiO2薄膜.在Vw:Ve=10:5、涂膜温度40℃的条件下制备的TiO2 薄膜显示了最佳的光致亲水性、自清洁效果及光催化活性.%A series of TiO2 films modified with different size particles have been prepared by changing the volume ratio of water to ethanol (Vw : Ve) in a TiO2 precursor sol and controlling dip—coating temperature. The nano—size particle formed on the surface inherits the characters of the colloidal particle in the sol. On one hand, the size of the dispersed particle in the sol increase as the Vw : Vc. is increased, the TiO2 film modified with particle of a desired size can be produced by adjusting the Vw : Ve and the dip — coating temperature. The TiO2 film prepared using sol with Vw : Ve = 10 : 5 at 40 ℃ shows good photoinduced hydrophilicity, self—cleaning and photocatalytic activity as compared with the other samples.
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