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Cellulose gel and aerogel from LiCl/DMSO solution

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Abstract

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-resolved 13C 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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Acknowledgments

This research was supported by Grant-in-Aids for Scientific Research (Grant Nos. P09015) from the New Energy and Industrial Technology Development Organization (NEDO). As well as, the financial support of this study, 973 National Basic Research Program of China (No.2010CB732205), is gratefully acknowledged.

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Authors and Affiliations

  1. Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, 159 Longpan Rd, Nanjing, 210037, China

    Zhiguo Wang

  2. Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657, Japan

    Zhiguo Wang, Shilin Liu, Yuji Matsumoto & Shigenori Kuga

  3. College of Chemical and Material Engineering, Jiangnan University, Wuxi, Jiangsu, 214122, China

    Shilin Liu

Authors
  1. Zhiguo Wang
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  2. Shilin Liu
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  3. Yuji Matsumoto
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  4. Shigenori Kuga
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Correspondence to Zhiguo Wang.

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Wang, Z., Liu, S., Matsumoto, Y. et al. Cellulose gel and aerogel from LiCl/DMSO solution. Cellulose 19, 393–399 (2012). https://doi.org/10.1007/s10570-012-9651-2

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  • DOI: https://doi.org/10.1007/s10570-012-9651-2

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