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Molecular Physics
An International Journal at the Interface Between Chemistry and Physics
Volume 117, 2019 - Issue 22: Learning from Disorder – A Tribute to Alan Soper
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Complex Systems

Temperature and concentration effects on decyltrimethylammonium micelles in water

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Pages 3389-3397 | Received 20 Mar 2019, Accepted 10 May 2019, Published online: 13 Aug 2019
 

Abstract

Wide-angle neutron scattering experiments combined with Empirical Potential Structural Refinement modelling have been used to study the detailed structure of decyltrimethylammonium bromide (C10TAB) micelles at two different temperatures; 25°C and 50°C and two concentrations; 0.4 and 0.8 M in water. At higher temperature, the micelles become smaller, and fewer counterions bind to the micelle surfaces, however, the headgroup positions are more ordered, possibly due to crowding in the smaller micelles. At higher concentration, the models suggest the micelles become elongated, although the aggregations numbers are smaller than those at the lower concentration. The smaller micelles found in 0.8 M solutions have more hydrated headgroups and lower counterion binding than the ellipsoidal micelles found in 0.4 M C10TAB solutions.

GRAPHICAL ABSTRACT

Acknowledgements

We thank the STFC for the beam time (RB620144), and for the computing resources provided by the STFC's e-Science facility. The data from this experiment is available at doi:10.5286/ISIS.E.RB620144-1.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by Science and Technology Facilities Council – ISIS Neutron Scattering Facility [grant number RB620144].

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