Mixed wormlike micelles of cationic surfactants: Effect of the cosurfactant chain length on the bending elasticity and rheological properties

Mixed wormlike micelles of cationic surfactants: Effect of the cosurfactant chain length on the bending elasticity and rheological properties
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阳离子表面活性剂混合蠕虫状胶束:助表面活性剂链长对弯曲弹性和流变性能的影响

DOI:
10.1016/j.colsurfa.2012.04.045
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发表时间:
2012
期刊:
Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子:
--
通讯作者:
Willenbacher
Willenbacher
中科院分区:
--
文献类型:
--
作者:
Oelschlaeger;Willenbacher

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研究了疏水基团性质相同但链长不同的阳离子表面活性剂蠕虫状混合胶束的行为。在0.4M KBr存在下,以十六烷基三甲基溴化铵(C16TAB)与其它疏水性较短的三甲基溴化铵(CnTAB)表面活性剂(n = 14,12,10和8)混合作为模型体系。机械高频流变实验允许表征混合物的线性粘弹性,频率范围高达106rads-1。通过这些测量,我们首次使用最近建立的方法(Willenbacher等人[46])确定了持久长度lpas的变化,该变化是添加短链表面活性剂的函数。我们发现,当增加混合物中的短链含量时,lp呈指数下降,与理论预测一致。随着链长较短的助表面活性剂浓度的增加,零剪切粘度η 0和最长松弛时间TR单调下降。除了C16TAB-C14TAB混合物外,所有混合物的平台模量G0均降低,其中它略有增加。后者的结果解释了一个渐进的减少胶束长度与短链助表面活性剂的含量增加。
We have investigated the behavior of mixed wormlike micelles (WLM) of cationic surfactants with hydrophobic moieties of the same nature but differing in chain length. Hexadecyltrimethylammonium bromide (C16TAB) with n=16 carbon atoms in the alkyl chain mixed with other trimethylammonium bromide (CnTAB) surfactants with shorter hydrophobic tails (n=14, 12, 10, and 8) in presence of 0.4M KBr has been selected as model system. Mechanical high frequency rheometry experiments permit characterization of the linear viscoelasticity of the mixtures covering the frequency range up to 106rads−1. From these measurements we have, for the first time, determined the variation of the persistence length lpas a function of the addition of short chain surfactant using a recently established approach (Willenbacher et al. [46]). We found that lpdecreases exponentially when increasing the short chain content in the mixture in agreement with theoretical predictions. The zero-shear viscosity η0as well as the longest relaxation time TRrevealed a monotonic decrease upon increasing the concentration of cosurfactant with shorter chain length. The plateau modulus G0decreases for all mixtures except for the C16TAB–C14TAB mixture where it increases slightly. The latter results are explained by a progressive diminution of the micellar length with increasing content of short chain cosurfactant.
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