Amphiphilicity and salt-tolerance of ethoxylated and propoxylated anionic surfactants

被引：0

作者：

Illous, Estelle ^{[1
]}

Ontiveros, Jesús F. ^{[1
]}

Lemahieu, Guillaume ^{[1
]}

Lebeuf, Raphael ^{[1
]}

Aubry, Jean-Marie ^{[1
]}

机构：

[1] Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181– UCCS –Unité de Catalyse et Chimie du Solide, Lille,F-59000, France

来源：

Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2021年 / 601卷

关键词：

The aqueous solubility of anionic surfactants is generally limited by their Krafft point. However; the insertion of non-ionic spacers such as ethoxy or propoxy groups between the alkyl chain and the anionic head is known to improve the water solubility of these surfactants in pure water or in the presence of electrolytes. In this work; the amphiphilicity of a series of ethoxylated or propoxylated sulfate surfactants is assessed by the PIT-slope method. Then; the phase behavior of these surfactants in concentrated aqueous solutions of NaCl or CaCl2 is investigated and compared with that of the typical nonionic (C12EO7) and ionic (SDS) surfactants. Surprisingly; sodium dodecyl sulfate presents a cloud point at high salinities and temperatures. Adding ethoxy or propoxy groups greatly enhances the resistance to electrolytes due to the disordered structure of non-ionic spacers that hinders crystallization; leading to Krafft point under 0 °C. Increasing the number of hydrophilic ethoxy groups increases the salt tolerance in contrast with the decrease observed with the slightly hydrophobic propoxy groups. Finally; the salt effect of CaCl2 and Ca(NO3)2. are compared pointing out the salting-out effect of Cl− and showing a weak salting-in effect of Ca2+ on nonionics and its strong interaction with sulfate anionic function. © 2020 Elsevier B.V;

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