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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Effect of malic acid on structure of silicon alkoxide derived silica
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Effect of malic acid on structure of silicon alkoxide derived silica

机译：苹果酸对硅醇盐衍生二氧化硅结构的影响

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摘要

The effect of malic acid on specific surface area, pore size distribution and gel structure of sol-gel derived silica gels was investigated. Tetraethoxysilane (TEOS) used as starting material was modified with malic acid prior to hydrolysis. The specific surface area of calcined gels increased and the pore size distribution shifted to smaller values and became sharper with an increase in malic acid. Malic acid affected particle size and the extent of condensation due to its acidity and condensation hindrance. Under high malic acid concentrations particulate gels were formed, Malic acid chemically bonded or adsorbed to silica polymers prevented particle growth and condensation among particles, Gels obtained at above malic acid/TEOS=1.17 (mol/mol) and calcined at 450 degrees C for 3 h showed high specific surface areas about 1000 m(2) g(-1). The gel had uniform mesopores with around 2 nm radius.
机译：研究了苹果酸对溶胶-凝胶衍生硅胶的比表面积，孔径分布和凝胶结构的影响。在水解之前，用苹果酸对用作原料的四乙氧基硅烷（TEOS）进行了改性。随着苹果酸的增加，煅烧凝胶的比表面积增加，并且孔径分布转移到较小的值，并且变得更尖锐。苹果酸由于其酸度和缩合障碍而影响粒度和缩合程度。在高苹果酸浓度下形成颗粒状凝胶，将苹果酸化学键合或吸附到二氧化硅聚合物上，防止了颗粒之间的颗粒生长和凝结，在上述苹果酸/TEOS=1.17（mol / mol）下获得的凝胶在450摄氏度下煅烧3 h显示出约1000 m（2）g（-1）的高比表面积。凝胶具有均匀的中孔，半径约为2 nm。

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