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A thermodynamic model of non-ionic surfactants' micellization in the presence of polyoxometalates

Luc Girard 1 Bappaditya Naskar 2 Jean-François Dufrêche 3 Jonathan Lai 1 Olivier Diat 1 Pierre Bauduin 1 
1 L2IA - Ions aux Interfaces Actives
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 : Polyoxometalates (POMs) are nanometric metal−oxide anions with an unmatched range of chemical and physical properties. During the past decade, significant efforts have been made to study POM surface activity and self-assembly properties that are essential for catalysis applications and for producing organic−inorganic hybrid materials. A previous work highlighted the tungstosilicate (SiW12O404−) and tungstophosphate (PW12O403−) Keggin POM anions' spontaneous and noncovalent adsorption at the micellar surface of non-ionic surfactants. In this study, the critical micelle concentrations (CMC) of two non-ionic surfactants, the n-octyl-β-glucoside (C8G1) and the tetraethylene glycol monooctyl ether (C8E4), were measured in the presence of POMs, and we propose herein thermodynamic models to explain an increase or a decrease of the CMC depending on the choice of the POM/surfactant couple.
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Luc Girard, Bappaditya Naskar, Jean-François Dufrêche, Jonathan Lai, Olivier Diat, et al.. A thermodynamic model of non-ionic surfactants' micellization in the presence of polyoxometalates. Journal of Molecular Liquids, Elsevier, 2019, 293, pp.111280. ⟨10.1016/j.molliq.2019.111280⟩. ⟨hal-02379312⟩

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