Cellulose gel and aerogel from LiCl/DMSO solution
Cellulose gel and aerogel from LiCl/DMSO solution
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LiCl/DMSO 溶液中的纤维素凝胶和气凝胶
DOI:
10.1007/s10570-012-9651-2
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发表时间:
2012-01
期刊:
影响因子:
5.7
通讯作者:
Kuga, Shigenori
中科院分区:
文献类型:
--
作者:
Wang, Zhiguo;Liu, Shilin;Matsumoto, Yuji;Kuga, Shigenori
Recently-discovered lignocellulosic solvent, 8%(w/w) lithium chloride/dimethyl sulfoxide (LiCl/DMSO), was found to dissolve cellulose of varied crystal forms and degree of polymerization. Cellulose samples could be activated for dissolution by complexation with ethylenediamine (EDA), giving EDA contents of 20–23% (w/w) in the complex irrespective of the cellulose type. The cellulose solution gave well-resolved13C NMR spectrum, confirming molecular dispersion. Cellulose could be coagulated by ethanol to give translucent cellulose gels, which could be converted to highly porous aerogels via solvent exchange drying. Nitrogen adsorption analysis gave their specific surface areas of 190–213 m2/g, with typical mesopore sizes of 10–60 nm. Scanning electron microscopy revealed the network structure of aerogel composed of relatively straight fibril segments, approx. 20 nm wide and 100–1,000 nm long. X-ray diffraction showed that the material is poorly crystalline cellulose II.
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