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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 >Tin oxide gel shrinkage during CO2 supercritical drying
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Tin oxide gel shrinkage during CO2 supercritical drying

机译：CO2超临界干燥过程中的氧化锡凝胶收缩

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Shrinking behavior of tin oxide gels during solvent exchange in CO2 supercritical drying was investigated. The drying process consisted of two solvent-exchanging steps, including a first replacement of water by acetone and a second of acetone by liquid CO2. Gels prepared from a basic sol with a zeta-potential of -75 mV exhibited extensive shrinkage during both steps, while those from an acidic hydrous precipitate of lower potential (zeta-potential < 35 mV) shrank only during the second step. The shrinkage during the first step correlates with the xi-potential reduction with increasing acetone concentration, while that during the second step for both gels can be attributed to osmotic compressive pressure that arises from an increase in the liquid-solid (gel skeleton) interfacial energy with increasing CO2 concentration. Dramatically different aerogel microstructures were obtained by controlling the gel surface potential in conjunction with different combinations of solvent-evaporating and supercritical drying. (C) 1998 Elsevier Science B.V. [References: 24]
机译：研究了CO2超临界干燥中溶剂交换过程中氧化锡凝胶的收缩行为。干燥过程包括两个溶剂交换步骤，包括第一步用丙酮代替水，第二步用液态CO2代替丙酮。由ζ电位为-75 mV的碱性溶胶制备的凝胶在两个步骤中均显示出广泛的收缩，而由较低电位（ zeta电位 <35 mV）的酸性含水沉淀形成的凝胶仅在第二步中收缩。第一步中的收缩与丙酮浓度增加时xi电位降低相关，而第二步中两种凝胶的收缩都可归因于液-固（凝胶骨架）界面能的增加引起的渗透压随着二氧化碳浓度的增加。通过结合溶剂蒸发和超临界干燥的不同组合来控制凝胶表面电势，可获得截然不同的气凝胶微观结构。 （C）1998 Elsevier Science B.V. [参考：24]

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