提高盐酸水解纤维素纳米晶体的分散稳定性。
Improving dispersion stability of hydrochloric acid hydrolyzed cellulose nano-crystals.
作者信息
Shang Zhen, An Xingye, Seta Frederikus Tunjung, Ma Mingshuai, Shen Mengxia, Dai Lin, Liu Hongbin, Ni Yonghao
机构信息
Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, No. 29, 13th Street, TEDA, Tianjin 300457, PR China; Department of Chemical Engineering, University of New Brunswick, Fredericton, NB E3B 5A3, Canada.
Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, No. 29, 13th Street, TEDA, Tianjin 300457, PR China.
出版信息
Carbohydr Polym. 2019 Oct 15;222:115037. doi: 10.1016/j.carbpol.2019.115037. Epub 2019 Jun 28.
Cellulose nano-crystals (CNC) have attracted great interests as a novel nanostructured material in recent years, thanks to their excellent mechanical properties, high surface area and lightweight and biocompatibility etc. Due to its low charged group content, CNC prepared from the hydrochloric acid hydrolysis has poor dispersibility in water, which hinders its further applications. In this work, well-dispersed cellulose nano-crystals are successfully prepared using a two-step method, consisting of hydrochloric acid hydrolysis, followed by adsorption of hexadecyl trimethyl ammonium bromide (CTAB) onto CNC. Results show that CTAB at a low concentration (0.13-0.47 mM) provides effective steric barriers to minimize the CNC aggregation, which is supported by TEM images and particle size distribution of CNC. At high CTAB concentrations (>0.5 mM), CNC aggregation occurs, which is due to the "bridging" effect of CTAB.
近年来，纤维素纳米晶体（CNC）作为一种新型纳米结构材料引起了极大的关注，这得益于其优异的机械性能、高比表面积、轻质以及生物相容性等。由于盐酸水解制备的CNC含有的带电基团较少，其在水中的分散性较差，这阻碍了它的进一步应用。在这项工作中，采用两步法成功制备了分散良好的纤维素纳米晶体，该方法包括盐酸水解，随后将十六烷基三甲基溴化铵（CTAB）吸附到CNC上。结果表明，低浓度（0.13 - 0.47 mM）的CTAB提供了有效的空间位垒，以最小化CNC的聚集，这得到了CNC的透射电子显微镜图像和粒度分布的支持。在高CTAB浓度（>0.5 mM）下，会发生CNC聚集，这是由于CTAB的“桥连”效应。
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