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:
影响因子:
--
通讯作者:
Willenbacher
中科院分区:
文献类型:
--
作者:
Oelschlaeger;Willenbacher
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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DOI:
10.1016/j.colsurfa.2008.10.022
发表时间:
2009-03
期刊:
Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子:
--
作者:
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DOI:
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1995
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1994
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--
发表时间:
1984
期刊:
影响因子:
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影响因子:
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