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Anionic surfactant solutions under shear using dissipative particle dynamics

Hendrikse, Rachel; Bayly, Andrew; Jimack, Peter

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Authors

Andrew Bayly

Peter Jimack



Abstract

We present a dissipative particle dynamics study of surfactant solutions under shear, which allows us to investigate their rheological properties. We consider a variety of concentrations and phase structures, including micellar solutions and liquid crystal phases. It is shown that the viscosity of micellar solutions increases as a function of concentration, in agreement with what is expected from experimental data. We also show that micelles can exhibit shear-thinning behavior when a shear force is applied, which is a result of micelles breaking down into smaller aggregates. Lamellar and hexagonal phases are found to orientate under the application of shear, in agreement with experimental observations. It is normally suggested that lamellar phases under shear can exhibit a transition between orientations as the shear rate is increased, usually as a result of lower viscosity. We calculate the viscosity for different lamellar phase orientations, showing that, although the viscosity of perpendicular orientations is lower than that of parallel orientations, we do not observe a transition to the perpendicular phase at high shear rates. Finally, we show that the choice of Schmidt number has a significant impact on the results, which is important for determining the correct behavior via simulations.

Citation

Hendrikse, R., Bayly, A., & Jimack, P. (2023). Anionic surfactant solutions under shear using dissipative particle dynamics. The Journal of Chemical Physics, 158(21), Article 214906. https://doi.org/10.1063/5.0152673

Journal Article Type Article
Acceptance Date May 16, 2023
Online Publication Date Jun 7, 2023
Publication Date 2023
Deposit Date Nov 9, 2023
Publicly Available Date Nov 9, 2023
Journal The Journal of Chemical Physics
Print ISSN 0021-9606
Electronic ISSN 1089-7690
Publisher American Institute of Physics
Peer Reviewed Peer Reviewed
Volume 158
Issue 21
Article Number 214906
DOI https://doi.org/10.1063/5.0152673
Public URL https://durham-repository.worktribe.com/output/1903460

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