An improved sol-gel process is disclosed for producing a synthetic silica glass article, in which a sol is formed having a silica loading as high as 34 to 40%. This high loading is achieved by introducing an aqueous colloidal silica suspension into a silicon alkoxide solution and slowly ...
Sol–gelA facile method for the preparation of polystyrene/silica (PS/SiO2) composite microspheres via sol-gel process of tetraethylorthosilicate (TEOS) employing polyvinylpyrrolidone-functionalized monodispersed PS microspheres as template is proposed. Hollow mesoporous silica microspheres containing surface ...
Microcrystalline PbS doped silica glasses prepared by the solgel process[J].Journal of Non-Crystalline Solids 1990,126.NOGAMI M, NAGASAKA K, KOTANI K. Microcrystalline PbS doped silica glasses prepared by the sol - gel process[J].J Non-Cryst Solids,1990, 126(1 -2) : 87-92....
A method of a fabricating silica glass by sol-gel process is provided. The method includes mixing silica, a binder, a dispersing agent and a gelling agent, and forming a sol without air bubbles; injecting the sol into a mold, the injection of the sol into the mold being controlled by ...
The former defines the shape of the microcomponents by stop-flow lithography and the latter is responsible for promoting the sol-gel process and decomposing the hydrogel. The sintered silica microcomponents shrink significantly but have a Young's modulus as high as 30?Gpa, a value much higher ...
Modified sol–gel processed silica matrices were prepared to explore the possibilities of using these matrices for electrophoresis applications. The sol–gel was prepared at room temperature using tetraethyl orthosilicate as a precursor at different molar ratios (R=4, 16, 32 and 64) in the presence...
The effect of formamide on the hydrolysis and condensation reactions at 50°C, both in the acid and in the basic step of a two-step sol-gel process, was investigated on mixtures of TEOS, ethanol and water, using 29Si NMR spectroscopy at 75°C. In the acid step the hydrolysis rate and...
were prepared via sol- gel process using titanium and silicon alkoxides, in the presence of chlorine, in the form of tita- nium tetrachloride or HCl. The gels were heat-treated until 800 °C. X-ray diffraction and Fourier transform infrared spectroscopy were used to understand the structural ...
The present research work describes the room temperature (27°C) synthesis of adherent and water repellent silica films on glass substrates using vinyltrimethoxysilane (VTMS) as a hydrophobic reagent by a single step sol–gel process. The silica sol was prepared by keeping the molar ratio of ...
US5240488 1992年8月14日 1993年8月31日 At&T Bell Laboratories Manufacture of vitreous silica product via a sol-gel process using a polymer additiveUS5240488 * Aug 14, 1992 Aug 31, 1993 At&T Bell Laboratories Manufacture of vitreous silica product via a sol-gel process using a polymer additive...