Effect of Oligomerization of Counterions on Water Activity in Aqueous Cationic Surfactant Systems.

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Effect of Oligomerization of Counterions on Water Activity in Aqueous Cationic Surfactant Systems.

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Publication Article, peer reviewed scientific
Title Effect of Oligomerization of Counterions on Water Activity in Aqueous Cationic Surfactant Systems.
Author Kocherbitov, Vitaly ; Söderman, Olle
Research Centre Biofilms - Research Center for Biointerfaces
Date 2016
English abstract
A sorption calorimetry study of cationic cetyltrimethyl ammonium surfactants with four different counterions was performed. The counterions were acetate, succinate, citrate, and butyl tetracarboxylate with formal charges ranging from 1 to 4, respectively. The counterions with 2–4 charges can be considered as oligomers. In all the cases, hydration experiments started with dry solid phases that upon water uptake went through solid-state phase transitions and hexagonal to micellar cubic phase transitions. It was found that in liquid-crystalline phases the activity of water increased with the degree of oligomerization or, equivalently, the formal charge of the counterions. The results are discussed in terms of the forces acting between the colloidal aggregates. It is argued that under the conditions investigated, the so-called strong-coupling theory can be used to describe the electrostatic forces between the charged colloidal objects. Therefore, we suggest that the observed dependence of water activity on the degree of polymerization is due to the entropy of mixing of the counterions in the water volume, which we describe using Flory–Huggins theory.
DOI https://doi.org/10.1021/acs.jpcb.6b03104 (link to publisher's fulltext.)
Publisher American Chemical Society
Host/Issue The Journal of Physical Chemistry B;28
Volume 120
ISSN 1520-5207
Pages 6961–6968
Language eng (iso)
Subject Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/21940 Permalink to this page
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