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The Interaction of Glymes with Surfactant Micelles
Author(s) -
Petropolis Nicholas P.,
Petropolis Harrison M.,
MacNeil Nicole E.,
Doucet Taylor M.,
Marangoni D. Gerrard
Publication year - 2021
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1002/jsde.12476
Subject(s) - chemistry , micelle , pulmonary surfactant , critical micelle concentration , counterion , triethylene glycol , solvent , inorganic chemistry , ether , sodium dodecyl sulfate , sodium dodecylbenzenesulfonate , aqueous solution , organic chemistry , ion , biochemistry
The critical micelle concentrations (CMC) values and counterion dissociation ( α values) have been determined for a number of mixed micellar systems consisting of two typical ionic surfactants and glycol ethers (glymes) as cosurfactants, namely diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether. Conductance experiments were used to determine the CMC and α values of the mixed micelles as a function of glyme concentration in the aqueous mixed solvent. Favorable interactions between sodium dodecyl sulfate micelles and glyme cosurfactants were deduced from the decreases in the CMC values and the large increase in the α values of these systems as a function of increasing glyme concentration in the mixed solvents. In contrast to the anionic surfactant/glyme systems, in general, there appeared to be little favorable interactions between the surfactant and glymes when micelles of the cationic surfactant dodecyltrimethylammonium bromide were formed in water/glyme solvent systems containing an increasing amount of the glymes. The interaction of glymes with the surfactant micelles was examined closely via 13 C nuclear magnetic resonance (NMR) chemical shifts for both surfactant and glyme carbons; these chemical shifts changes were interpreted in terms of the distribution and the localization of the glymes in the aggregates. Finally, partition constants, determined from two‐dimensional diffusion‐oriented spectroscopy (2D‐DOSY) experiments, were used to calculate thermodynamic quantities of transfer of the glymes between the bulk phase and the self‐assembled aggregates. All these results are interpreted in terms of the key contributions that both the glyme ethoxylated groups and alkyl endgroups make to the hydrophobic interactions.