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Transformation of nanostructure of silica gels during drying

机译:干燥过程中硅胶纳米结构的转变

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摘要

Small angle X-ray scattering (SAXS) experiments performed on silica gels dried by different methods show that for some of them, intensity oscillations occur around the Porod law. These oscillations have been analysed to give a chord length distribution of the solid network of the gels. Primary solid particles are rough in xerogels and CO2 evacuated aerogels. Aerogels obtained by methanol supercritical drying show a smooth surface with a well definited chord length distribution curve. These features are explained by silica dissolution-redeposition reactions occurring during the supercritical drying treatment in methanol. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 16]
机译:在用不同方法干燥的硅胶上进行的小角X射线散射(SAXS)实验表明,对于其中某些硅胶,强度振荡围绕波罗德定律发生。分析了这些振荡,以给出凝胶的固体网络的弦长分布。初级固体颗粒在干凝胶和二氧化碳排空的气凝胶中较粗糙。通过甲醇超临界干燥获得的气凝胶显示出光滑的表面,弦长分布曲线明确。这些特征可以通过在甲醇中进行超临界干燥处理期间发生的二氧化硅溶解-再沉积反应来解释。 (C)2000 Elsevier Science B.V.保留所有权利。 [参考:16]

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