Cationic surfactants as a non-covalent linker for oxidised cellulose nanofibrils and starch-based hydrogels
Cationic surfactants as a non-covalent linker for oxidised cellulose nanofibrils and starch-based hydrogels
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DOI：
10.1016/j.carbpol.2019.115816
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发表时间：
2020-04-01
影响因子：
11.2
通讯作者：
Edler, Karen J.
中科院分区：
文献类型：
--
作者：
Hossain, Kazi M. Zakir;Calabrese, Vincenzo;Edler, Karen J.
研究了阳离子表面活性剂存在下TEMPO-氧化纤维素纳米纤丝（OCNF）-淀粉水凝胶的流变性能。使用阳离子表面活性剂十二烷基三甲基溴化铵（DTAB）和十六烷基三甲基溴化铵（CTAB）在约5 mM表面活性剂下引发OCNF的凝胶化。由于OCNF和DTAB/CTAB带相反的电荷，静电吸引力被建议解释的凝胶化机制。将OCNF（1重量%）和可溶性淀粉（0.5和1重量%）共混以制备水凝胶，其中向OCNF中加入淀粉导致更高的储能模量。建议淀粉聚合物与纤维素纳米纤丝形成网络。通过添加阳离子表面活性剂（5 mM的DTAB/CTAB）进一步增强OCNF-淀粉水凝胶的刚度和粘度。zeta电位和直链淀粉-碘络合物的分析也进行了确认的表面电荷和OCNF-淀粉-表面活性剂的相互作用，以提供一个深入了解的表面活性剂诱导的凝胶网络。
Rheological properties of hydrogels composed of TEMPO-oxidised cellulose nanofibrils (OCNF)-starch in the presence of cationic surfactants were investigated. The cationic surfactants dodecyltrimethylammonium bromide (DTAB) and cetyltrimethylammonium bromide (CTAB) were used to trigger gelation of OCNF at around 5mM surfactant. As OCNF and DTAB/CTAB are oppositely charged, an electrostatic attraction is suggested to explain the gelation mechanism. OCNF (1 wt%) and soluble starch (0.5 and 1 wt%) were blended to prepare hydrogels, where the addition of starch to the OCNF resulted in a higher storage modulus. Starch polymers were suggested to form networks with cellulose nanofibrils. The stiffness and viscosity of OCNF-Starch hydrogels were enhanced further by the addition of cationic surfactants (5mM of DTAB/CTAB). zeta-potential and amylose-iodine complex analyses were also conducted to confirm surface charge and interaction of OCNF-starch-surfactant in order to provide an in-depth understanding of the surfactant-induced gel networks.