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Issue 30, 2020
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On the effect of the nature of counterions on the self-assembly of polyoxyethylene alkyl ether carboxylic acids

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Abstract

In this contribution, we investigate the effect of the type of counterion on the properties of dilute solutions of polyoxyethylene alkyl ether carboxylic acids. Two different surfactants, presenting an oleic acid alkyl chain and on-average five and nine ethylene oxide units, and terminated by a weakly anionic carboxymethyl group were studied. The surfactants were gradually ionized with sodium hydroxide, arginine, and choline hydroxide. The solutions properties were probed by light scattering, electrophoretic mobility, density and sound velocity measurements, as well as by small-angle neutron scattering. To our initial surprise, no specific effect arising from the nature of the counterion could be determined. We ascribe this phenomenon to the fact that the presence of the ethylene oxide units markedly dilutes the surfactant head group charge density, reducing counterion condensation and subsequent counterion specific effects.

Graphical abstract: On the effect of the nature of counterions on the self-assembly of polyoxyethylene alkyl ether carboxylic acids

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Supplementary files

Article information


Submitted
27 May 2020
Accepted
06 Jul 2020
First published
07 Jul 2020

Soft Matter, 2020,16, 7137-7143
Article type
Paper

On the effect of the nature of counterions on the self-assembly of polyoxyethylene alkyl ether carboxylic acids

C. Crivello, G. Lazzara and L. Chiappisi, Soft Matter, 2020, 16, 7137
DOI: 10.1039/D0SM00986E

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