Counterion binding alters surfactant self-assembly in deep eutectic solvents

A. Sanchez-fernandez, O. S. Hammond, K. J. Edler, T. Arnold, J. Doutch, R. M. Dalgliesh, P. Li, K. Ma, A. J. Jackson

Research output: Contribution to journalArticle

Abstract

Micellisation of surfactants in deep eutectic solvents has been recently demonstrated to provide a controllable way to modify micelle morphology. Ion-pair interactions between the solvent and the surfactant headgroup were identified as affecting the micellisation by modifying the charge density of the micelle. Here we explore the micellisation of dodecylsulfate surfactants with different counterions (Li+, Cs+, Mg2+, Bmim+, Emim+, cholinium+) dissolved in two deep eutectic solvents: choline chloride:urea and choline chloride:glycerol. Surface tension results show a solvent and counterion dependence of the CMC of the surfactants. Small-angle neutron scattering was subsequently used to investigate the morphology of the micelles formed. The results show that the elongation of the micelles is strongly dependent on the solvent, showing more elongated aggregates in choline chloride:urea than in choline chloride:glycerol. The morphology of micelles in DES was also found to depend on the counterion, where the affinity of binding showed similarities to that in water.
LanguageEnglish
Pages13952-13961
Number of pages10
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number20
Early online date1 May 2018
DOIs
StatusE-pub ahead of print - 1 May 2018

Fingerprint

Micelles
choline
Surface-Active Agents
eutectics
Self assembly
Eutectics
self assembly
micelles
Choline
Micellization
surfactants
chlorides
glycerols
ureas
Glycerol
Urea
Neutron scattering
Charge density
elongation
Surface tension

Cite this

Sanchez-fernandez, A., Hammond, O. S., Edler, K. J., Arnold, T., Doutch, J., Dalgliesh, R. M., ... Jackson, A. J. (2018). Counterion binding alters surfactant self-assembly in deep eutectic solvents. Physical Chemistry Chemical Physics, 20(20), 13952-13961. https://doi.org/10.1039/C8CP01008K

Counterion binding alters surfactant self-assembly in deep eutectic solvents. / Sanchez-fernandez, A.; Hammond, O. S.; Edler, K. J.; Arnold, T.; Doutch, J.; Dalgliesh, R. M.; Li, P.; Ma, K.; Jackson, A. J.

In: Physical Chemistry Chemical Physics, Vol. 20, No. 20, 01.05.2018, p. 13952-13961.

Research output: Contribution to journalArticle

Sanchez-fernandez, A, Hammond, OS, Edler, KJ, Arnold, T, Doutch, J, Dalgliesh, RM, Li, P, Ma, K & Jackson, AJ 2018, 'Counterion binding alters surfactant self-assembly in deep eutectic solvents', Physical Chemistry Chemical Physics, vol. 20, no. 20, pp. 13952-13961. https://doi.org/10.1039/C8CP01008K
Sanchez-fernandez, A. ; Hammond, O. S. ; Edler, K. J. ; Arnold, T. ; Doutch, J. ; Dalgliesh, R. M. ; Li, P. ; Ma, K. ; Jackson, A. J. / Counterion binding alters surfactant self-assembly in deep eutectic solvents. In: Physical Chemistry Chemical Physics. 2018 ; Vol. 20, No. 20. pp. 13952-13961.
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AB - Micellisation of surfactants in deep eutectic solvents has been recently demonstrated to provide a controllable way to modify micelle morphology. Ion-pair interactions between the solvent and the surfactant headgroup were identified as affecting the micellisation by modifying the charge density of the micelle. Here we explore the micellisation of dodecylsulfate surfactants with different counterions (Li+, Cs+, Mg2+, Bmim+, Emim+, cholinium+) dissolved in two deep eutectic solvents: choline chloride:urea and choline chloride:glycerol. Surface tension results show a solvent and counterion dependence of the CMC of the surfactants. Small-angle neutron scattering was subsequently used to investigate the morphology of the micelles formed. The results show that the elongation of the micelles is strongly dependent on the solvent, showing more elongated aggregates in choline chloride:urea than in choline chloride:glycerol. The morphology of micelles in DES was also found to depend on the counterion, where the affinity of binding showed similarities to that in water.

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