高疏水纳米二氧化硅薄膜的制备

溶胶凝胶方法制备高疏水薄膜,加入胶体二氧化硅粒子和TMCS控制薄膜表面粗糙度和表面化学性质。薄膜表面具有很大的表面粗糙度,使薄膜体现出很好的疏水性能。这种方法能够实现一步法大面积不规则镀制薄膜,具有一定的实用价值.     

玻璃表面纳米TiO2薄膜的制备及光催化性能研究

用Sol-Gel方法在载玻片上制备了透明的TiO2纳米薄膜。对溶胶的制备工艺、薄膜与基体的结合强度及光催化活性进行了研究。试验表明，薄膜的最佳烧结温度为650℃，加热速度为2℃/min，在此温度下烧结薄膜具有高的结合强度。XRD分析表明薄膜为锐钛矿晶型，对醋酸的光照降解试验表明，薄膜具有较高的光催化活性。     

In vitro behaviour of sol-gel interconnected porous scaffolds of doped wollastonite

Using the sol-gel method, two different three-dimensional (3D) porous interconnected scaffolds were prepared, whose compositions were MgO-K₂O-CaO-SiO₂ (MgO-K₂O-wollastonite) and Na₂O-K₂O-CaO-SiO₂ (Na₂O-K₂O-wollastonite). Scaffold sintering was performed at 950 °C for 8 h. The scaffolds were obtained and soaked in simulated body fluid for different times (6 h, 3 d, 7 d and 14 d) to study their in vitro behaviour. Scanning electron microscopy and energy-dispersive X-ray spectroscopy revealed the presence of both a hydroxyapatite-like microstructure and a nanostructure on the surface of 3D scaffolds. The presence of Na and K in the scaffolds resulted in the precipitation of a hierarchical hydroxyapatite-like layer composed of nanorods, approximately 200–400 nm in size. The presence of Mg and K ions in the composition caused the precipitation of particles with a nanorod morphology, approximately 50–100 nm in size. The addition of Na, K and Mg, K to the wollastonite resulted in scaffolds with mechanical strengths of 0.03 and 0.02 MPa, respectively.     

Effect of calcination temperature and addition of silica, zirconia, alumina on the photocatalytic activity of titania

Nanophase titania was prepared by sol-gel method and spray pyrolysis. We tried to elucidate the relationship between the photoactivity and the crystallite size of anatase phase. To better understand the changes in the bulk and the surface of titania as the calcination temperature is changed, EPR and photoluminescence analysis were carried out. The effect of the secondary metal oxide embedded into titania matrix on the photoactivity was also investigated. It was found that the photoactivity of titania has a linear relationship to the crystallite size. For the analysis of EPR and photoluminescence for pure titania, the increase of photoactivity with increasing the calcination temperature is due to the formation of surface active sites such as O^- as well as the increase of crystallinity resulting from the removal of bulk defects. For silica/titania mixed oxide, it was found that the improvement of the thermal stability of anatase phase is important to enhance the photoactivity of titania because the prepared catalyst was calcined at a higher temperature than 700 °C without forming rutile phase. It was also concluded that the simultaneous increase of the surface area and the crystallinity promises to improve the photoactivity achieved by increasing the content of silica up to 60%. By the analysis of EPR and photoluminescence, it was found that the embedding of silica into titania matrix suppresses the formation of Ti³⁺ and produces a new active site of Ti-O-Si, which easily interacts with the oxygen. In the investigation of zirconia/titania and alumina/titania mixed oxide, it was found that the increase of the surface OH is essential to positively affect of the improved thermal stability on the photoactivity.     

溶胶-凝胶法制备纳米YBa2Cu3O7的研究

概述了溶胶－凝胶方法的基本原理及其影响因素，着重阐述了各种溶胶－凝胶工艺对制备纳米陶瓷YBa2Cu3O7的影响及其实验结果。     

Sol-gel-derived ZnO/Cu/ZnO multilayer thin films and their optical and electrical properties

Sol-gel preparation of transparent conducting ZnO/Cu/ZnO multilayer thin films has been investigated. CuO thin films were deposited on glass substrates via a dip-coating method. The CuO thin films were further subjected to reductive annealing in hydrogen to form highly conductive Cu thin films with sheet resistances as low as 10 Ω/□. ZnO/Cu/ZnO multilayers were successfully prepared in a similar way by reducing ZnO/CuO/ZnO. The sheet resistance of the ZnO/Cu/ZnO multilayer thin films is about 10 kΩ/□, which is much higher than that of the pure Cu thin films. The formation of large discrete Cu crystallites in the multilayers explains the poor electrical conductivity of the sol-gel-derived ZnO/Cu/ZnO multilayers.     

溶胶-凝胶(Sol-Gel)法的原理、工艺及其应用

介绍了溶胶-凝胶法的发展历史及特点,说明了溶胶-凝胶法的原理及工艺过程,指出了溶胶-凝胶法在一些领域的应用及未来的发展趋势.     

用溶胶—凝胶法制备掺杂酞菁蓝的玻璃表面装饰膜

采用溶胶－凝胶法，以正硅酸乙酯，异丙醇，水为原料制备了掺杂有机颜料酞菁蓝的玻璃表面装饰膜，利用随圆偏振光测厚仪，分光光度计，色度计测量了装饰膜的性质，研究了装饰膜的耐紫外线照射的稳定性，耐酸性和耐碱性，结果表明此装饰膜是稳定的。     

掺杂PST薄膜的制备与介电调谐性能研究

采用Sol-Gel法在Pt／TiO2／SiO2／Si衬底上制备了多种不同组分的（Pb0.3Sr0.7）1-xKxTiO3（PST）（x=0,1mol％,2．5mol％,5mol％）多层均匀薄膜,并研究了它们的介电调谐性能。发现掺杂后薄膜的晶粒尺寸明显减小,介电常数降低及介电损耗减小。1MHz时,随K含量的从0增加至5mol％,薄膜的介电常数从841降低至539,而介电损耗由0．134减小到0．058,其微波介电综合性能改善。     

纳米二氧化钛粉体制备条件的探索

以钛酸丁酯为前驱体,采用溶胶-凝胶法制备纳米级二氧化钛微粒。对溶胶、凝胶形成的不同条件进行了试验。水解时应将水用乙醇稀释再对钛酸丁酯进行水解;pH在2～3时产生的凝胶较为均匀;溶剂乙醇与前驱体钛酸丁酯的用量比例n（乙醇）︰n（钛酸丁酯）=5︰3较为理想;生成凝胶的合适温度为35～40℃。