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Surfactant-Solvent Interaction Effects on the Micellization of Cationic Surfactants in a Carboxylic Acid-Based Deep Eutectic Solvent

Sanchez-Fernandez, Adrian; Hammond, Oliver S.; Jackson, Andrew J. LU ; Arnold, Thomas; Doutch, James and Edler, Karen J. LU (2017) In Langmuir 33(50). p.14304-14314
Abstract

Deep eutectic solvents have been demonstrated to support amphiphile self-assembly, providing potential alternatives as structure-directing agents in the synthesis of nanostructures, and drug delivery. Here we have expanded on this recent research to investigate the self-assembly of alkyltrimethylammonium bromide surfactants in choline chloride:malonic acid deep eutectic solvent and mixtures of the solvent with water. Surface tension and small-angle neutron scattering were used to determine the behavior of the amphiphiles. Surfactants were found to remain active in the solvent, and surface tension measurements revealed changes in the behavior of the surfactants with different levels of hydration. Small-angle neutron scattering shows that... (More)

Deep eutectic solvents have been demonstrated to support amphiphile self-assembly, providing potential alternatives as structure-directing agents in the synthesis of nanostructures, and drug delivery. Here we have expanded on this recent research to investigate the self-assembly of alkyltrimethylammonium bromide surfactants in choline chloride:malonic acid deep eutectic solvent and mixtures of the solvent with water. Surface tension and small-angle neutron scattering were used to determine the behavior of the amphiphiles. Surfactants were found to remain active in the solvent, and surface tension measurements revealed changes in the behavior of the surfactants with different levels of hydration. Small-angle neutron scattering shows that in this solvent the micelle shape depends on the surfactant chain length, varying from globular micelles (aspect ratio ∼2) for short chain surfactants to elongated micelles (aspect ratio ∼14) for long chain surfactants even at low surfactant concentration. We suggest that the formation of elongated micelles can be explained through the interaction of the solvent with the surfactant headgroup, since ion-ion interactions between surfactant headgroups and solvent may modify the morphology of the micelles. The presence of water in the deep eutectic solvents promotes an increase in the charge density at the micelle interface and therefore the formation of less elongated, globular micelles.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
33
issue
50
pages
11 pages
publisher
The American Chemical Society
external identifiers
  • scopus:85038572641
  • wos:000418625800012
ISSN
0743-7463
DOI
10.1021/acs.langmuir.7b03254
language
English
LU publication?
yes
id
3f715f4a-29ef-4568-9c8d-c63ba88ef619
date added to LUP
2018-01-03 09:33:26
date last changed
2018-05-20 04:39:46
@article{3f715f4a-29ef-4568-9c8d-c63ba88ef619,
  abstract     = {<p>Deep eutectic solvents have been demonstrated to support amphiphile self-assembly, providing potential alternatives as structure-directing agents in the synthesis of nanostructures, and drug delivery. Here we have expanded on this recent research to investigate the self-assembly of alkyltrimethylammonium bromide surfactants in choline chloride:malonic acid deep eutectic solvent and mixtures of the solvent with water. Surface tension and small-angle neutron scattering were used to determine the behavior of the amphiphiles. Surfactants were found to remain active in the solvent, and surface tension measurements revealed changes in the behavior of the surfactants with different levels of hydration. Small-angle neutron scattering shows that in this solvent the micelle shape depends on the surfactant chain length, varying from globular micelles (aspect ratio ∼2) for short chain surfactants to elongated micelles (aspect ratio ∼14) for long chain surfactants even at low surfactant concentration. We suggest that the formation of elongated micelles can be explained through the interaction of the solvent with the surfactant headgroup, since ion-ion interactions between surfactant headgroups and solvent may modify the morphology of the micelles. The presence of water in the deep eutectic solvents promotes an increase in the charge density at the micelle interface and therefore the formation of less elongated, globular micelles.</p>},
  author       = {Sanchez-Fernandez, Adrian and Hammond, Oliver S. and Jackson, Andrew J. and Arnold, Thomas and Doutch, James and Edler, Karen J.},
  issn         = {0743-7463},
  language     = {eng},
  month        = {12},
  number       = {50},
  pages        = {14304--14314},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Surfactant-Solvent Interaction Effects on the Micellization of Cationic Surfactants in a Carboxylic Acid-Based Deep Eutectic Solvent},
  url          = {http://dx.doi.org/10.1021/acs.langmuir.7b03254},
  volume       = {33},
  year         = {2017},
}