Neutron Reflectometry of an Anionic Surfactant at the Solid-Liquid Interface under Shear
American Chemical Society
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Welbourn, R., Bartholomew, F., Gutfreund, P., & Clarke, S. (2017). Neutron Reflectometry of an Anionic Surfactant at the Solid-Liquid Interface under Shear. Langmuir, 33 (24), 5982-5990. https://doi.org/10.1021/acs.langmuir.7b00530
Neutron reflectometry with in situ rheology is used to measure the shear response of an adsorbed anionic surfactant (sodium bis(2-ethylhexyl) sulfosuccinate, AOT) at the alumina-water interface. A low surfactant concentration is measured where a single bilayer adsorbs at the interface as well as a higher concentration where a multilamellar structure forms. The low concentration structure does not change with the imposed shear (oscillatory or steady). However, the lamellar phase shows a loss of structure under both steady and oscillatory shear. There are differences between the steady and oscillatory cases, which are discussed, with both showing a strong dependence on the strain amplitude.
We thank BP plc [grant number EP/J501876/1] and the Engineering and Physical Sciences Research Council, UK (EPSRC) for financial support for this work.
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External DOI: https://doi.org/10.1021/acs.langmuir.7b00530
This record's URL: https://www.repository.cam.ac.uk/handle/1810/266688