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Neutron reflection study of the adsorption of the phosphate surfactant NaDEHP onto alumina from water.


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Type

Article

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Authors

Welbourn, Rebecca JL 
Lee, Seung Yeon 
Gutfreund, Philipp 
Hughes, Arwel 
Zarbakhsh, Ali 

Abstract

The adsorption of a phosphorus analogue of the surfactant AOT, sodium bis(2-ethylhexyl) phosphate (NaDEHP), at the water/alumina interface is described. The material is found to adsorb as an essentially water-free bilayer from neutron reflection measurements. This is similar to the behavior of AOT under comparable conditions, although AOT forms a thicker, more hydrated layer. The NaDEHP shows rather little variation with added salt, but a small thickening of the layer on increasing the pH, in contrast to the behavior of AOT.

Description

Keywords

0306 Physical Chemistry (incl. Structural)

Journal Title

Langmuir

Conference Name

Journal ISSN

0743-7463
1520-5827

Volume Title

31

Publisher

American Chemical Society (ACS)
Sponsorship
We thank BP plc and EPSRC for financial support for this work as well as the ISIS and ILL staff and scientists for the allocation of beam time and technical assistance with NR measurements. We also appreciate Chris Sporikou at Department of Chemistry, University of Cambridge, for help with the surfactant synthesis.