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首页> 外文会议>Conference on First Jet Propulsion Laboratory in Situ Instruments Workshop Jun 11-13, 2002 Pasadena, California, USA >Optical Based Sol-gel Sensors
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Optical Based Sol-gel Sensors

机译：基于光学的溶胶-凝胶传感器

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摘要

The sol-gel method is a novel approach for preparing amorphous inorganic solids from liquid precursors under ambient conditions. The process begins with hydrolyzing liquid monomeric alkoxides to produce a sol. Hydrolysis and condensation reactions take place at the same time to form colloid particles, which interconnect into a three-dimensional solid matrix (gel). Common precursors used to synthesize silica and silicates are tetramethoxysilane (TMOS) and tetraethoxysilane (TEOS). The hydrolysis reaction is usually acid-catalyzed, forming silanol (Si-OH) groups and alcohol as a by-product (Eq 1.) The condensation reaction produces siloxane bonds (-Si-O-Si-), connecting colloid particles into a three-dimensional matrix (Eq. 2) The resulting material is porous and pores are filled with water and alcohol. After gelation, polycondensation reactions continue to take place. As more siloxane bonds form and trapped liquid evaporates, there is an increase in the strength of the silica network accompanied by a decrease in pore size. Starting with a liquid, the final product of the sol-gel process can be in various forms. The sol can be cast into a bulk gel (monolith), coated onto a substrate to form thin films, or spun into ceramic fibers.
机译：溶胶-凝胶法是一种在环境条件下由液体前体制备非晶态无机固体的新颖方法。该方法开始于水解液体单体醇盐以产生溶胶。水解和缩合反应同时发生，形成胶体颗粒，它们相互连接成三维固体基质（凝胶）。用于合成二氧化硅和硅酸盐的常见前体是四甲氧基硅烷（TMOS）和四乙氧基硅烷（TEOS）。水解反应通常是酸催化的，形成硅烷醇（Si-OH）基团和作为副产物的醇（等式1）。缩合反应产生硅氧烷键（-Si-O-Si-），将胶体颗粒连接成三维矩阵（等式2）所得材料是多孔的，孔中充满了水和酒精。胶凝后，缩聚反应继续发生。随着更多硅氧烷键的形成和捕获的液体的蒸发，二氧化硅网络的强度随之增加，同时孔径减小。从液体开始，溶胶-凝胶法的最终产物可以是各种形式。可以将溶胶浇铸成块状凝胶（整料），涂在基材上形成薄膜，或纺成陶瓷纤维。

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