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首页> 外文期刊>Journal of solid state electrochemistry >Colloidal particle size of fumed silica dispersed in solution and the particle size effect on silica gelation and some electrochemical behaviour in gelled electrolyte
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Colloidal particle size of fumed silica dispersed in solution and the particle size effect on silica gelation and some electrochemical behaviour in gelled electrolyte

机译：分散在溶液中的气相二氧化硅的胶体粒径及其对硅胶凝胶化的影响以及凝胶电解质中的一些电化学行为

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摘要

Commercial-grade fumed silica was dispersed by mechanical shearing and/or ultrasonic force to produce dispersed silica particles with different sizes. The light-scattering technique and a diagrammatic method of extrapolation used to eliminate the influence of particle interaction were applied to determine the size of the particles. Then, the effect of particle size on the gelation of fumed silica in sulphuric acid medium, as well as some electrochemical properties, such as ion transfer and redox capacities of lead, in the gelled electrolyte were examined. The results showed that the size of dispersed particles affected the gelation of fumed silica itself: with increasing size, the thixotropy of the system increased and the gelling time decreased, particularly for those particles obtained only by simple stirring. The strength of the gel increased with increasing particle size. At an identical silica content, the increase in particle size led to a decrease in the density of the particles: this weakened the three-dimensional structure of the silica particle network and reduced the efficiency of ion transfer. However, the effect of silica particle size on the redox capacities of lead was negligible.
机译：通过机械剪切和/或超声力分散商业级气相二氧化硅，以产生具有不同尺寸的分散二氧化硅颗粒。应用光散射技术和用于消除粒子相互作用影响的外推图解法确定粒子的尺寸。然后，研究了粒径对气相介质在硫酸介质中凝胶化的影响，以及凝胶电解质中的一些电化学性能，例如离子转移和铅的氧化还原能力。结果表明，分散颗粒的尺寸影响气相二氧化硅本身的凝胶化：随着尺寸的增加，体系的触变性增加，胶凝时间减少，特别是对于仅通过简单搅拌获得的颗粒。凝胶的强度随着粒度的增加而增加。在相同的二氧化硅含量下，粒径增加导致颗粒密度降低：这削弱了二氧化硅颗粒网络的三维结构并降低了离子转移效率。但是，二氧化硅粒径对铅的氧化还原容量的影响可以忽略不计。

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