Qin Yang, Chang Ranran, Ge Shengju, Xiong Liu, Sun Qingjie
College of Food Science Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China.
College of Food Science Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China.
Int J Biol Macromol. 2017 Sep;102:1073-1082. doi: 10.1016/j.ijbiomac.2017.05.007. Epub 2017 May 3.
To broaden the application of cellulose nanocrystals (CNCs) in the field of biopolymer nanocomposites, a systematic assessment of the viscoelastic properties of CNC suspensions in the presence of glycerol (Gly) and/or sodium chloride (NaCl) was conducted. The viscosity, storage modulus (G'), and loss modulus (G'') increased with increasing concentrations of CNCs and Gly, respectively. Dramatically, the G' and G'' values were raised and tanδ (<1) decreased with the increasing addition of NaCl, indicating that the elastic properties of CNCs in NaCl solutions continuously strengthened, thereby the gel-like response of the network was enhanced. Moreover, the addition of 40% Gly significantly increased the values of G' and G'' for CNCs in NaCl solutions. This work demonstrates new findings related to the rheological properties of CNC gels with Gly/NaCl, and accounts for the interaction mechanisms between CNCs and CNCs/Gly/NaCl, with electrostatic interactions, hydrogen bonds, van der Waals forces, and Na bridging. We wish our study could better serve for future works based on design of CNCs in biomedical and packaging materials industries.
为了拓宽纤维素纳米晶体（CNCs）在生物聚合物纳米复合材料领域的应用，我们对在甘油（Gly）和/或氯化钠（NaCl）存在下CNC悬浮液的粘弹性进行了系统评估。粘度、储能模量（G'）和损耗模量（G''）分别随着CNC和Gly浓度的增加而增加。引人注目的是，随着NaCl添加量的增加，G'和G''值升高，tanδ（<1）降低，这表明NaCl溶液中CNC的弹性性能不断增强，从而增强了网络的凝胶状响应。此外，添加40%的Gly显著提高了NaCl溶液中CNC的G'和G''值。这项工作展示了与含有Gly/NaCl的CNC凝胶流变学性质相关的新发现，并解释了CNC与CNC/Gly/NaCl之间的相互作用机制，包括静电相互作用、氢键、范德华力和Na桥连。我们希望我们的研究能够更好地服务于未来基于生物医学和包装材料行业中CNC设计的工作。
