Ionic Conductivity of Gel Prepared Silicates

本研究将研究输运性质， 凝胶衍生碱金属硅酸盐的特殊离子传导性 材料. 这项调查处于 化学和材料科学。 高离子电导率 需要高的碱浓度。 溶胶-凝胶过程 包括醇盐和盐是一种将高浓度的 将碱浓缩成硅酸盐。 溶胶-凝胶法是一种低温制备玻璃的方法 形成，其中允许醇盐的混合物水解 和氧化物以形成氧化物网络。 氧化物网络 在可除去的溶剂存在下缩合 从毛孔中自然蒸发出来。 该微孔凝胶 干燥后的残留物称为干凝胶。 初步研究 表明微孔隙对传输有影响 性能，因此，离子导电性。 影响干凝胶传输特性的三个方面是 研究了：1）微孔率和孔径的影响， 2)质子电导率的贡献，以及3） 微孔固体中的相分离。 原则 该项目的仪器包括复阻抗 光谱，氮吸附分析，傅里叶变换 红外光谱与固态魔角旋转 核磁光谱学

This research will investigate the transport properties, in particular ionic conductivity, of gel-derived alkali silicate materials. This investigation lies at the interface between chemistry and materials science. High ionic conductivity requires high alkali concentrations. The sol-gel process involving alkoxides and salts is one way of incorporating high concentrations of alkali into silicates. The sol-gel process is a low temperature approach to glass formation, where a mixture of alkoxides is allowed to hydrolyze and polymerize to form an oxide network. The oxide network condenses in the presence of the solvent which can be removed from the pores by natural evaporation. The microporous gel which remains after drying is called a xerogel. Preliminary studies show that the microporosity has an effect on transport properties and, consequently, ionic conductivity. Three aspects of xerogels affecting transport properties are being investigated: 1) the effect of microporosity and pore size, 2) the contribution of proton conductivity, and 3) effect of phase separation in a microporous solid. Principle instrumentation for this project includes complex impedance spectroscopy, nitrogen sorption analysis, Fourier transform infrared spectroscopy and solid state magic angle spinning nuclear magnetic spectroscopy.