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Aerogels from Chitosan Solutions in Ionic Liquids

机译：离子液体中壳聚糖溶液的气凝胶

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Chitosan aerogels conjugates the characteristics of nanostructured porous materials, i.e., extended specific surface area and nano scale porosity, with the remarkable functional properties of chitosan. Aerogels were obtained from solutions of chitosan in ionic liquids (ILs), 1-butyl-3-methylimidazolium acetate (BMIMAc), and 1-ethyl-3-methyl-imidazolium acetate (EMIMAc), in order to observe the effect of the solvent in the structural characteristics of this type of materials. The process of elaboration of aerogels comprised the formation of physical gels through anti-solvent vapor diffusion, liquid phase exchange, and supercritical CO 2 drying. The aerogels maintained the chemical identity of chitosan according to Fourier transform infrared spectrophotometer (FT-IR) spectroscopy, indicating the presence of their characteristic functional groups. The internal structure of the obtained aerogels appears as porous aggregated networks in microscopy images. The obtained materials have specific surface areas over 350 m 2 /g and can be considered mesoporous. According to swelling experiments, the chitosan aerogels could absorb between three and six times their weight of water. However, the swelling and diffusion coefficient decreased at higher temperatures. The structural characteristics of chitosan aerogels that are obtained from ionic liquids are distinctive and could be related to solvation dynamic at the initial state.
机译：壳聚糖Aerogels缀合纳米结构多孔材料的特性，即延长的比表面积和纳米尺度孔隙率，具有显着的壳聚糖功能性能。从离子液体（ILS），1-丁基-3-甲基咪唑鎓（BMIMAC）的壳聚糖中的壳聚糖溶液和1-乙基-3-甲基 - 咪唑鎓乙酸盐（emimac）中获得气凝胶，以观察溶剂的作用在这种类型的材料的结构特征中。制动气凝胶的方法包括通过抗溶剂蒸汽扩散，液相交换和超临界CO 2干燥形成物理凝胶。由于傅里叶变换红外分光光度计（FT-IR）光谱，Aerogels根据傅立叶变换红外分光光度计（FT-IR）光谱，表明其特征官能团的存在。所获得的气凝胶的内部结构在显微镜图像中显示为多孔聚合网络。所得材料具有超过350m 2 / g的特定表面积，可被认为是介孔的。根据肿胀实验，壳聚糖Aerogels可以在其水重量的三倍和六倍之间吸收。然而，在较高温度下膨胀和扩散系数降低。由离子液体获得的壳聚糖气凝胶的结构特征是独特的，并且可以与初始状态有关的溶剂化动态。

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