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How Do Anions Affect Self-Assembly and Solubility of Cetylpyridinium Surfactants in Water

Wolfram Müller 1 Christophe Dejugnat 1 Thomas Zemb 2 Jean-François Dufrêche 3 Olivier Diat 1
1 L2IA - Ions aux Interfaces Actives
ICSM - UMR 5257 - Institut de Chimie Séparative de Marcoule
2 LTSM - Tri ionique par les Systèmes Moléculaires auto-assemblés
ICSM - UMR 5257 - Institut de Chimie Séparative de Marcoule
3 LMCT - Modélisation Mésoscopique et Chimie Théorique
ICSM - UMR 5257 - Institut de Chimie Séparative de Marcoule
Abstract : We report the specific effects of a series of anions (chloride, nitrate, and oxalate) on the solubility and self-assembly of cationic cetylpyridinium surfactants in water. The anion influence on micellization was evidenced by tensiometry and determination of Krafft temperatures. Anions strongly affect these parameters, depending on their position in the lyotropic series as well as on their “bridging” character. Scattering techniques (light, X-rays, and neutrons) were used to characterize the structures of micelles, and by solving a lateral equation of state approach, we show that chaotropic anions can be considered as adsorbed on the pyridinium head groups, inducing a decrease of the surface polarity and a Krafft temperature shift. Mixing different counteranions in various ratios led to a competition with a preferential adsorption at the micellar surface.
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https://hal.umontpellier.fr/hal-02002016
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Soumis le : jeudi 31 janvier 2019 - 14:29:21
Dernière modification le : lundi 25 octobre 2021 - 11:38:30

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Wolfram Müller, Christophe Dejugnat, Thomas Zemb, Jean-François Dufrêche, Olivier Diat. How Do Anions Affect Self-Assembly and Solubility of Cetylpyridinium Surfactants in Water. Journal of Physical Chemistry B, American Chemical Society, 2013, 117 (5), pp.1345-1356. ⟨10.1021/jp3093622⟩. ⟨hal-02002016⟩

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