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

Rebecca J.L. Welbourn; Felicity Bartholomew; Philipp Gutfreund; Stuart M. Clarke

doi:10.1021/acs.langmuir.7b00530

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

Rebecca J.L. Welbourn, Felicity Bartholomew, Philipp Gutfreund, Stuart M. Clarke

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

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.

Original language	English
Pages (from-to)	5982-5990
Number of pages	9
Journal	Langmuir
Volume	33
Issue number	24
DOIs	https://doi.org/10.1021/acs.langmuir.7b00530
State	Published - Jun 20 2017
Externally published	Yes

Funding

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 as well as the ILL staff and scientists for the allocation of beam time and technical assistance with NR measurements.

Funders	Funder number
BP	EP/J501876/1
Engineering and Physical Sciences Research Council

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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.",

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AU - Clarke, Stuart M.

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AB - 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.

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

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