【作者】 史明辉；

【导师】 乌学东；

【作者基本信息】 上海交通大学 ， 应用化学， 2008， 硕士

【摘要】 超疏水表面具有很多独特的表面性能:如自清洁性、防污特性、疏水、疏油、低摩擦系数等特性,这些特殊性能使其在很多领域具有巨大的应用价值。透明超疏水表面除了上述超疏水的特性如果对可见光具有良好的透过性,可以将其应用到汽车、飞机等挡风玻璃,高层建筑幕墙玻璃等等,具有更为广阔的应用前景,是目前超疏水表面方向上的一个研究热点。但是目前已经报道的方法,如PE-CVD、溶胶-凝胶、升华法等等存在一定的弱点,如制备技术上缺乏大规模制备的操作性、制备条件苛刻、成本昂贵等,因此,研究成本低廉、过程可控、尺寸可调、适用性好、适合大面积制备的透明超疏水表面的制备方法非常有意义。本文通过溶胶-凝胶技术,在表面粗糙度和光学透过率之间取得一个合适的平衡点,探索一种透明基底上制备透明超疏水涂层的方法。采用氧化铝和二氧化硅两种溶胶体系制备涂层,并用FE-SEM、AFM、FT-IR、UV-Vis、CA等手段对所制得的透明超疏水涂层进行表征,得到了接触角大于150度、滚动角低于5度并且具有较高可见光透过率的透明超疏水涂层,所用的方法操作简单、成本低廉、适合大规模制备。同时还讨论了不同实验条件对涂层性能的影响并用Cassie模型对所制备的涂层进行理论分析。更多还原

【Abstract】 A surface with water contact angle higher than 150°is called a superhydrophobic surface, it has many unique surface properties, like self-cleaning, anti-stain, hydrophobic, oleophobic and low friction, etc. These properties make the superhrophobic surfaces potentially applicable in many areas. Transparent superhydrophobic surface is one of the special hydrophobic surfaces, which has high transmittance of the visible light, and it can be used not only in windshields of cars and aircrafts, building glass, but also for the hulls of ships and tubes or pipes. Because of their enormous application potential, these surfaces have been the subject of great interest and extensive studies in recent years. But only few methods have been developed to fabricate transparent superhydrophobic surfaces so far, including plasma enhanced chemical vapor deposition (PE-CVD), sol-gel, sublimation, phase separation and so on. These methods mentioned above have some disadvantages, such as high-cost, rigorous experiment conditions and equipments, and difficulties in scale-up preparations. Therefore it is important and meaningful to make the fabrication of transparent superhydrophobic surface controllable, low-cost and applicable in large-scale.In the present study, we used a sol-gel technique to balance the surface roughness and visible light transmittance, and explored a method of fabricating transparent superhydrophobic coatings on glass substrate. Alumina sol and silica sol were synthesized for the coatings, FE-SEM、AFM、FT-IR、UV-Vis、CA were used for surface characterizations. The coatings fabricated possess high water static CAs of over 150°, small sliding angles of less than 5°, and have relatively high average visible light transmittances. The method we found is simply operable, controllable, low-cost and large-scale applicable. The influences of the experiment conditions to the coatings were also discussed in this paper, and Cassie model was employed for theoretic analysis of the coatings.更多还原