title: Micellization of alkyltrimethylammonium bromide surfactants in choline chloride:glycerol deep eutectic solvent.
abstract: Deep eutectic solvents have shown the ability to promote the self-assembly of surfactants in solution. However, some differences have been found compared with self-assembly in pure water and other polar organic solvents. The behaviour of alkyltrimethylammonium bromides in choline chloride:glycerol deep eutectic solvent has been studied by means of surface tension, X-ray and neutron reflectivity and small-angle neutron scattering. The surfactants were found to remain surface active and showed comparable critical micelle concentrations to the same surfactants in water. Our scattering studies demonstrate that these surfactants form globular micelles with ellipsoidal shape in solution. The size, shape and aggregation number of the aggregates were found to vary with the chain length of the surfactant. Specific solvent-headgroup interactions were not found in this system, unlike those we have previously postulated for anionic surfactants in choline chloride deep eutectic solvents.
authors.affiliation: Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK and European Spallation Source, Lund, Sweden. andrew.jackson@esss.se.
authors.forename: Adrian
authors.initials: A
authors.lastname: Sanchez-Fernandez
authors.affiliation: Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, UK.
authors.forename: Thomas
authors.identifier: http://orcid.org/0000-0001-8295-3822
authors.initials: T
authors.lastname: Arnold
authors.affiliation: European Spallation Source, Lund, Sweden. andrew.jackson@esss.se and Department of Physical Chemistry, Lund University, SE-221 00, Lund, Sweden.
authors.forename: Andrew J
authors.identifier: http://orcid.org/0000-0002-6296-0336
authors.initials: AJ
authors.lastname: Jackson
authors.affiliation: Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
authors.forename: Sian L
authors.initials: SL
authors.lastname: Fussell
authors.affiliation: ISIS Spallation Neutron Source, Harwell Campus, Didcot OX11 OQX, UK.
authors.forename: Richard K
authors.initials: RK
authors.lastname: Heenan
authors.affiliation: Institut Laue-Langevin, 71 avenue des Martyrs, SC20 156, 38.042 Grenoble Cedex 9, France.
authors.forename: Richard A
authors.initials: RA
authors.lastname: Campbell
authors.affiliation: Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
authors.forename: Karen J
authors.identifier: http://orcid.org/0000-0001-5822-0127
authors.initials: KJ
authors.lastname: Edler