title: Neutron reflection study of the adsorption of the phosphate surfactant NaDEHP onto alumina from water.
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.
authors.affiliation: †BP Institute and Department of Chemistry, University of Cambridge, Madingley Rise, Madingley Road, Cambridge, UK.
authors.forename: Rebecca J L
authors.initials: RJ
authors.lastname: Welbourn
authors.affiliation: †BP Institute and Department of Chemistry, University of Cambridge, Madingley Rise, Madingley Road, Cambridge, UK.
authors.forename: Seung Yeon
authors.initials: SY
authors.lastname: Lee
authors.affiliation: ‡Institute Laue-Langevin, Grenoble, France.
authors.forename: Philipp
authors.initials: P
authors.lastname: Gutfreund
authors.affiliation: §ISIS, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, UK.
authors.forename: Arwel
authors.initials: A
authors.lastname: Hughes
authors.forename: Ali
authors.initials: A
authors.lastname: Zarbakhsh
authors.affiliation: †BP Institute and Department of Chemistry, University of Cambridge, Madingley Rise, Madingley Road, Cambridge, UK.
authors.forename: Stuart M
authors.initials: SM
authors.lastname: Clarke