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Micelle Structure in a Deep Eutectic Solvent: A Small-Angle Scattering Study

DOI: 10.1039/C6CP01757F DOI Help

Authors: Adrian Sanchez Fernandez (University of Bath) , Karen J. Edler (University of Bath) , Tom Arnold (Diamond Light Source) , Richard K Heenan (ISIS Neutron Source) , Lionel Porcar (Institut Laue-Langevin) , Nicholas Terrill (Diamond Light Source) , Ann Terry (Rutherford Appleton Laboratory) , Andrew Jackson (European Spallation Source ESS AB)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Phys. Chem. Chem. Phys.

State: Published (Approved)
Published: April 2016
Diamond Proposal Number(s): 11392

Open Access Open Access

Abstract: In recent years many studies into green solvents have been undertaken and Deep Eutectic Solvents (DES) have emerged as sustainable and green alternatives to conventional solvents, since they can be formed from cheap, non-toxic organic precursors. In this study we examine amphiphile behaviour in these novel media to test our understanding of amphiphile self-assembly within environments that have an intermediate polarity between polar and non-polar extremes. We have built on our recently published results to present a more detailed structural characterisation of micelles of sodium dodecylsulfate (SDS) within the eutectic mixture of choline chloride and urea. Here we show that SDS adopts an unusual cylindrical aggregate morphology, unlike that seen in water and other polar solvents. A new morphology transition to shorter aggregates was found with increasing concentration and correlated with the specific interaction of choline ions with the surfactant headgroups. The self-assembly of SDS in this solvent was also investigated in the presence of water; which promotes the formation of shorter aggregates.

Journal Keywords: micelles, deep eutectic solvents, SAXS, SANS

Subject Areas: Chemistry, Materials


Instruments: I22-Small angle scattering & Diffraction

Other Facilities: ISIS, ILL

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