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Neutron Reflectometry of an Anionic Surfactant at the Solid–Liquid Interface under Shear
Version 2 2017-06-19, 19:35
Version 1 2017-06-06, 15:24
journal contribution
posted on 2017-05-22, 00:00 authored by Rebecca J. L. Welbourn, Felicity Bartholomew, Philipp Gutfreund, Stuart M. ClarkeNeutron
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.