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
Kuga, Shigenori
中科院分区:
材料科学2区
文献类型:
--
作者:
Wang, Zhiguo;Liu, Shilin;Matsumoto, Yuji;Kuga, Shigenori

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最近发现的木质纤维素溶剂,8%(w/w)氯化锂/二甲基亚砜(LiCl/DMSO),被发现溶解不同的晶体形式和聚合度的纤维素。纤维素样品可以通过与乙二胺(EDA)络合来活化溶解,无论纤维素类型如何,络合物中EDA含量为20-23%(w/w)。纤维素溶液给出了良好分辨的13 C NMR光谱,证实了分子分散。纤维素可以用乙醇凝结,得到半透明的纤维素凝胶,通过溶剂交换干燥可以将其转化为高度多孔的气凝胶。氮吸附分析得到它们的比表面积为190-213 m2/g,典型的中孔尺寸为10-60 nm。扫描电子显微镜显示了气凝胶的网络结构,由相对直的原纤维段组成,约为100。20 nm宽和100- 1,000 nm长。X-射线衍射表明,该材料是结晶较差的纤维素II。
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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