光控亲/疏油可逆转换的硅钛复合微纳米结构涂层研究

Reversible oleophobic/philic conversion properties in micro-nano Si-Ti composite coatings under UV irradiation

以简便价廉的方法制备出一种新型氟试剂修饰的SiO2-TiO2复合微纳米结构涂层。采用场发射扫描电子显微镜(FE-SEM)、X射线光电子能谱(XPS)和油接触角测试等方法对涂层进行了表征和测试。研究结果显示,该涂层具备良好的UV光驱动亲/疏油可逆转换特性,最初为疏油性(90°),光照后变得相对亲油(24°),黑暗放置后恢复疏油性,且经5次反复循环无明显衰减。与单纯纳米TiO2涂层相比,复合涂层表面油浸润性的转变因微纳米结构的存在而显著强化,且随着SiO2微球直径的增大,其亲/疏油效果得到增强。以上研究为亲/疏油可逆转换智能材料的设计提供了新的方法和借鉴。

A new type of fluorine modified micro-nano SiO2-TiO2 composite coating has been prepared though a convenient and low-cost method.Field emission scanning electron microscopy (FE-SEM),X-ray photoelectron spectroscopy (XPS)and oil contact angle were used to characterize the composite coatings.The results con-firmed the composite coating with repeated and reversible oleophobic/philic conversion properties (90-24°), which responded to cycles of UV irradiation and dark storage.Such switch can be safety performed during five continuous cycles without apparent attenuation.Compared with the single-scale nanostucture,the hierarchical micro-nano structure was demonstrated to play a key role in the improvement of the oleophobic/philic variation. Under the test range,the bigger the SiO2 microsphere is,the larger variation is obtained.These findings offer a new method for the design of smart materials with switchable oil wettability.