Neutron Reflectometry of an Anionic Surfactant at the Solid-Liquid Interface under Shear


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Authors
Welbourn, RJL 
Bartholomew, F 
Gutfreund, P 
Clarke, SM 
Abstract

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.

Description
Keywords
0306 Physical Chemistry (incl. Structural)
Journal Title
Langmuir
Conference Name
Journal ISSN
0743-7463
1520-5827
Volume Title
33
Publisher
American Chemical Society
Sponsorship
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.