Preparation of Oxide Coating Films with Tailored Texture by the Sol-Gel Method

1.以聚乙烯基三乙氧基硅烷和正硅酸乙酯为原料，采用溶胶-凝胶法在聚酰亚胺基体上制备了无裂纹、柔韧的有机-无机杂化涂层.采用电泳溶胶-凝胶法，以聚乙烯亚胺（PEI）为阳离子表面活性剂，在阴极上制备了二氧化硅厚膜。当PEI的添加量为0.01质量%，涂布溶胶的pH为5时，得到的二氧化硅厚膜没有裂纹，厚度为约100 μ m。20 * 米3。以Y（OAc）_3和Mn（OAc）_2的乙醇溶液为原料，制备了YMnO_3薄膜。研究发现，回流工艺可以显著降低烧成温度，改善薄膜的微观结构和介电性能.发现溶胶-凝胶法制备的TiO_2-SiO_2薄膜经热水处理后析出了直径约为6 nm的纳米晶，有机聚合物的加入促进了纳米晶的析出。这一温和的工艺使我们能够在各种耐热性差的有机聚合物和有机物基体上形成纳米晶分散膜.用含有苯基三乙氧基硅烷衍生的苯基硅倍半氧烷（PhSiO <3/2>）微粒的溶胶，通过电泳沉积在ITO涂层玻璃基片上制备了厚膜。在400 ℃下热处理后，厚膜的透光性显著提高。SEM观察发现，热处理后厚膜的形貌发生了变化，从颗粒间有大量空隙的聚集体变成了没有空隙的整体。

1. Organic-inorganic hybrid coating films, which were crack-free and flexible, were prepared using polyvinyltriethoxysilane and tetraethoxysilane by the sol-gel method on polyimide substrates.2. Thick silica films were prepared on the cathode by the electrophoretic sol-gel deposition using a cationic polymer surfactant, polyethylenimine (PEI). When the content of PEI added was 0.01 mass% and pH of the coating sols was 5, the resultant thick silica films had no cracks and the thickness was ca. 20 *m.3. YMnO_3 thin films being proposed as a new material for non volatile ferroelectric memory devices were prepared from ethanol solutions of Y(OAc)_3 and Mn(OAc)_2. The reflux process was found to drastically lower the firing temperature and improve the microstructure and dielecfric properties of the resultant films.4. We have found that anatase nanocrystals with about 6 nm in diameter precipitated in sol-gel derived TiO_2-SiO_2 thin films after hot water treatment and that the addition of organic polymer accelerated the precipitation of anatase. This mild process enable us to form anatase nanocrystals- dispersed films on various kinds of substrates including organic polymer and organism of which heat resistance is poor.5. Thick films were prepared on ITO-coated glass substrates by electrophoretic deposition using sols containing phenylsilsesquioxane (PhSiO_<3/2>) particles derived from phenyltriethoxysilane. Transparency of the thick PhSiO_<3/2> films was significantly improved by a heat-treatment at 400ﾟC.From SEM observation, the thick films were found to change in morphology from aggregates of particles with a number of open spaces among the particles to a monolith with no open spaces after the heat-treatment.