Control of Surface Texture of Coating Films Prepared via Solution

(1)紫外光照射在由花状Al_2O_3凝胶膜、超薄的TiO_2层和Fas层三层组成的超疏水涂层上，导致超疏水表面转变为超亲水表面。(2)以醇铝为原料制备的Al_2O_3凝胶薄膜在60℃的热水中浸泡后，表面形成了约20-50 nm的小粗糙度。将水解烷基三甲氧基硅烷包覆在花朵状的Al_2O_3薄膜上，可制得与水的接触角大于150°的透明超疏水薄膜。(3)采用溶胶凝胶法在PET衬底上制备了含有机聚合物的SiO_2薄膜。发现聚乙烯醇对有机-无机复合薄膜涂层的PET基片的透水性和透氧性的抑制效果最好。(4)溶液和真空热处理制备的YMnO_3薄膜具有细小、均匀、致密的结构，表面非常光滑。由于真空热处理提高了薄膜的结晶度和漏电流，首次在室温下观察到了溶液法制备的YMnO_3薄膜的铁电性。(5)用热水处理溶胶-凝胶法制备的含有聚乙二醇的纳米锐钛矿型薄膜，得到了透明、多孔的锐钛矿型纳米分散薄膜。在未添加聚乙二醇的SiO_2-TiO_2薄膜中，经热水处理的薄膜表面形成了锐钛矿型纳米晶，且表面粗糙度较小。

(1) UV irradiation on a superhydrophobic coating film which consists of three layers, a flowerlike Al_2O_3 gel film, a very thin TiO_2 layer, and a FAS layer, led to conversion of the superhydrophobic surface into a superhydrophilic surface.(2) A small roughness of about 20-50 nm was found to form on the Al_2O_3 gel films prepared from aluminum alkoxide and then immersed in hot water at 60℃. The coating of hydrolyzed fluoroalkyltrimethoxysilane on the flowerlike Al_2O_3 films produced transparent, superhydrophobic films with contact angle for water larger than 150°.(3) Silica thin films containing organic polymers were prepared on PET substrates by the sol-gel method. Poly(vinyl alcohol) was found to be most effective to suppress the water and oxygen permeability of PET substrates coated with the organic-inorganic composite films.(4) YMnO_3 thin films prepared from solution and heat-treated in vacuum had a fine, uniform, and dense structure with a very smooth surface. The ferroelectricity of the solution-derived YMnO_3 thin films at room temperature was observed for the first thme due to the improvement of crystallinity and the leakage current by the vacuum heat treatment.(5) Transparent and porous anatase nanocrystals-dispersed films were prepared by treating the sol-gel derived TiO_2-SiO_2 coating films containing poly (ethylene glycol) with hot water. In the SiO_2-TiO_2 films without the addition of poly (ethylene glycol), anatase nanocrystals were formed at the surface of the films with hot water treatment, and the surface had a small roughness.