Thermodynamics of the Micellization of a Simple Zwitterionic Surfactant in the Presence of Imidazolium Salts
Álvaro Javier Patiño-Agudelo, Nicolas Keppeler, Lucas Mendel de Oliveira Silva Martins, Frank H. Quina
TL;DR
This study explores how different imidazolium salts affect the formation of zwitterionic micelles, revealing how anions and cations influence micellization thermodynamics.
Contribution
The paper introduces a new method to separate the effects of cations and anions on micellization using a modified thermodynamic model.
Findings
Imidazolium salts with different anions modulate the critical micelle concentration (CMC) of the zwitterionic surfactant SB3–14.
C4mimI and C4mimClO4 initially decrease the CMC of SB3–14 before increasing it at higher salt concentrations.
A modified thermodynamic model successfully separates cation and anion contributions to micellization.
Abstract
Although formally neutral, in aqueous media, zwitterionic micelles selectively concentrate the anions of added inorganic salts at the micelle-water interface. The resultant negative electrostatic potential of the micelles can be additionally modulated by the metal cations of the added salt. In the present work, isothermal titration calorimetry (ITC) has been employed to determine the critical micelle concentrations (CMC) and standard thermodynamic parameters of micellization (ΔG mic 0, ΔH mic 0, and ΔS mic 0) of the zwitterionic surfactant N-tetradecyl-dimethylammoniumpropanesulfonate (SB3–14) in aqueous solution at 298.15 K as a function of the concentration (100–1000 mmol L–1) of six salts with organic cations: the chloride salts of 1-methylimidazolium (ComimCl) and 1-ethyl-3-methylimidazolium (C2mimCl) and the chloride, bromide, iodide, and perchlorate salts of…
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Taxonomy
TopicsSurfactants and Colloidal Systems · Chemical and Physical Properties in Aqueous Solutions · Electrostatics and Colloid Interactions