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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 >Multigram scale synthesis and characterization of low-density silica xerogels
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Multigram scale synthesis and characterization of low-density silica xerogels

机译：低密度二氧化硅干凝胶的克级合成和表征

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The synthesis of silica with preserved porosity and tailored morphology by sol-gel process can be achieved by hybrid organic-inorganic synthesis: a modified alkoxide, viz. 3-(2-aminoethylamino)propyltrimethoxysilane (EDAS), is introduced during the base catalysed synthesis with TEOS as main silica precursor. Additives with methoxy groups induce a nucleation mechanism because of their higher reactivity compared to main reagents with ethoxy groups. The nucleation model presented in previous papers was refined by taking into account the porosity of the particles and calculating the number of additive molecules by nucleus for each value of the ratio of additive/main reagent. The extrapolation of the synthesis process to semi-industrial scale goes through the replacement of laboratory grade reagents by industrial grade reagents and the scaling up to the production of higher quantities. At each of these two steps, the morphology and porosity of the samples has been compared to those of laboratory grade samples. It was shown that the texture and particle size has quasi totally been preserved. (c) 2006 Elsevier B.V. All rights reserved.
机译：通过溶胶-凝胶法合成具有保留的孔隙率和特定形态的二氧化硅可以通过有机-无机杂化合成来实现：一种改性的醇盐，即。在碱催化的合成过程中，以TEOS为主要二氧化硅前体引入了3-（2-氨基乙基氨基）丙基三甲氧基硅烷（EDAS）。与具有乙氧基的主要试剂相比，具有甲氧基的添加剂可诱导成核机理，因为它们的反应性更高。通过考虑颗粒的孔隙率，并针对每个添加剂/主试剂比率值，通过原子核计算添加剂分子的数量，从而完善了先前论文中提出的成核模型。将合成过程推算为半工业规模是通过用工业级试剂代替实验室级试剂，并扩大规模以生产更大数量的产品。在这两个步骤的每一个步骤中，均已将样品的形态和孔隙率与实验室级样品的形态和孔隙率进行了比较。结果表明，质地和粒度几乎完全得以保留。 （c）2006 Elsevier B.V.保留所有权利。

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