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Complex by design : Hydrotrope-induced micellar growth in deep eutectic solvents

Sanchez-Fernandez, Adrian LU ; Leung, Anna E. ; Kelley, Elizabeth G. and Jackson, Andrew J. LU (2021) In Journal of Colloid and Interface Science 581. p.292-298
Abstract

Hypothesis: The self-assembly of ionic surfactants in deep eutectic solvents has recently been demonstrated, opening up new possibilities in terms of the development of formulated products and templating of nanostructured materials. As it occurs in an aqueous environment, the solvophobic effect drives the formation of micelles in these solvents and specific-ion interactions alter the resulting structures. We hypothesized that the presence of hydrotropic salts would greatly affect the micellar structure in deep eutectic solvents, ultimately leading to the formation of worm-like aggregates. Experiments: A systematic investigation performed on hydrotrope-surfactant assemblies in neat and hydrated 1:2 choline chloride:glycerol is presented.... (More)

Hypothesis: The self-assembly of ionic surfactants in deep eutectic solvents has recently been demonstrated, opening up new possibilities in terms of the development of formulated products and templating of nanostructured materials. As it occurs in an aqueous environment, the solvophobic effect drives the formation of micelles in these solvents and specific-ion interactions alter the resulting structures. We hypothesized that the presence of hydrotropic salts would greatly affect the micellar structure in deep eutectic solvents, ultimately leading to the formation of worm-like aggregates. Experiments: A systematic investigation performed on hydrotrope-surfactant assemblies in neat and hydrated 1:2 choline chloride:glycerol is presented. The effect of choline salicylate on the micellization of hexadecyltrimethylammonium chloride at different hydrotrope-to-surfactant ratios was probed by contrast variation small-angle neutron scattering. Findings: Here the first investigation on salt-induced micellar growth in deep eutectic solvents is presented. The microscopic characterization of the system shows that the micelle-hydrotrope interaction in pure and hydrated deep eutectic solvents results in a significant increase in micelle elongation. The condensation of the hydrotrope on the micelle, which alters the effective monomer packing, leads to the formation of worm-like micelles with tunable morphology and flexibility. The results presented here present new possibilities in terms of self-assembly and co-assembly in neoteric solvents, where micelle morphology can be controlled through surfactant-salt interactions.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Deep eutectic solvent, Hydrotrope, Small-angle neutron scattering, Worm-like micelle
in
Journal of Colloid and Interface Science
volume
581
pages
7 pages
publisher
Elsevier
external identifiers
  • scopus:85089076666
  • pmid:32771739
ISSN
0021-9797
DOI
10.1016/j.jcis.2020.07.077
language
English
LU publication?
yes
id
0591f7c9-9157-4824-ba24-5ab83ef58e7d
date added to LUP
2020-08-17 09:31:03
date last changed
2021-07-06 03:54:25
@article{0591f7c9-9157-4824-ba24-5ab83ef58e7d,
  abstract     = {<p>Hypothesis: The self-assembly of ionic surfactants in deep eutectic solvents has recently been demonstrated, opening up new possibilities in terms of the development of formulated products and templating of nanostructured materials. As it occurs in an aqueous environment, the solvophobic effect drives the formation of micelles in these solvents and specific-ion interactions alter the resulting structures. We hypothesized that the presence of hydrotropic salts would greatly affect the micellar structure in deep eutectic solvents, ultimately leading to the formation of worm-like aggregates. Experiments: A systematic investigation performed on hydrotrope-surfactant assemblies in neat and hydrated 1:2 choline chloride:glycerol is presented. The effect of choline salicylate on the micellization of hexadecyltrimethylammonium chloride at different hydrotrope-to-surfactant ratios was probed by contrast variation small-angle neutron scattering. Findings: Here the first investigation on salt-induced micellar growth in deep eutectic solvents is presented. The microscopic characterization of the system shows that the micelle-hydrotrope interaction in pure and hydrated deep eutectic solvents results in a significant increase in micelle elongation. The condensation of the hydrotrope on the micelle, which alters the effective monomer packing, leads to the formation of worm-like micelles with tunable morphology and flexibility. The results presented here present new possibilities in terms of self-assembly and co-assembly in neoteric solvents, where micelle morphology can be controlled through surfactant-salt interactions.</p>},
  author       = {Sanchez-Fernandez, Adrian and Leung, Anna E. and Kelley, Elizabeth G. and Jackson, Andrew J.},
  issn         = {0021-9797},
  language     = {eng},
  pages        = {292--298},
  publisher    = {Elsevier},
  series       = {Journal of Colloid and Interface Science},
  title        = {Complex by design : Hydrotrope-induced micellar growth in deep eutectic solvents},
  url          = {http://dx.doi.org/10.1016/j.jcis.2020.07.077},
  doi          = {10.1016/j.jcis.2020.07.077},
  volume       = {581},
  year         = {2021},
}