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Chitosan bio-based organic-inorganic hybrid aerogel microspheres

机译：壳聚糖生物基有机-无机杂化气凝胶微球

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摘要

Recently, organic-inorganic hybrid materials have attracted tremendous attention thanks to their outstanding properties, their efficiency, versatility and their promising applications in a broad range of areas at the interface of chemistry and biology. This article deals with a new family of surface-reactive organic-inorganic hybrid materials built from chitosan microspheres. The gelation of chitosan (a renewable amino carbohydrate obtained by deacetylation of chitin) by pH inversion affords highly dispersed fibrillar networks shaped as self-standing microspheres. Nanocasting of sol-gel processable monomeric alkoxides inside these natural hydrocolloids and their subsequent CO _2 supercritical drying provide high-surface-area organic-inorganic hybrid materials. Examples including chitosan-SiO _2, chitosan-TiO _2, chitosan-redox-clusters and chitosan-clay-aerogel microspheres are described and discussed on the basis of their textural and structural properties, thermal and chemical stability and their performance in catalysis and adsorption. Gelling together: Gelation of a chitosan biopolymers by pH inversion affords highly dispersed self-standing microspheres (see figure). Nanocasting and nanoreplication by sol-gel chemistry and/or intercalation by ion exchange provide a new family of surface-reactive organic-inorganic hybrid materials.
机译：近来，有机-无机杂化材料由于其出色的性能，效率，多功能性以及在化学和生物学的广泛领域中的广阔应用前景而引起了极大的关注。本文涉及由壳聚糖微球构建的表面活性有机-无机杂化材料的新家族。通过pH转化使壳聚糖（通过几丁质脱乙酰化而获得的可再生氨基碳水化合物）的凝胶化，可提供高度分散的原纤维状的原纤维状网络。这些天然水胶体内部可溶胶-凝胶加工的单体醇盐的纳米浇铸及其随后的CO _2超临界干燥提供了高表面积的有机-无机杂化材料。根据壳聚糖-SiO _2，壳聚糖-TiO _2，壳聚糖-氧化还原团簇和壳聚糖-粘土-气凝胶微球的例子，对其结构和性质，热和化学稳定性以及它们在催化和吸附方面的性能进行了描述和讨论。胶凝在一起：通过pH转化使壳聚糖生物聚合物胶凝，可得到高度分散的自立微球（见图）。通过溶胶-凝胶化学进行的纳米浇铸和纳米复制和/或通过离子交换进行插层提供了表面活性有机-无机杂化材料的新家族。

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