title: Surfactant-mediated desorption of polymer from the nanoparticle interface.
abstract: The surfactant-mediated desorption of adsorbed poly(vinylpyrrolidone), PVP, from anionic silica surfaces by sodium dodecyl sulfate, SDS, was observed. While photon correlation spectroscopy shows that the size of the polymer-surfactant-particle ensemble grows with added SDS, a reduction in the near-surface polymer concentration is measured by solvent relaxation NMR. Volume fraction profiles of the polymer layer extracted from small-angle neutron scattering experiments illustrate that the adsorbed polymer layer has become more diffuse and the polymer chains more elongated as a result of the addition of SDS. The total adsorbed amount is shown to decrease due to Coulombic repulsion between the surfactant-polymer complexes and between the complexes and the anionic silica surface.
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
authors.forename: Beatrice
authors.initials: B
authors.lastname: Cattoz
authors.forename: Terence
authors.initials: T
authors.lastname: Cosgrove
authors.forename: Martin
authors.initials: M
authors.lastname: Crossman
authors.forename: Stuart W
authors.initials: SW
authors.lastname: Prescott
mesh_terms: D000327:Adsorption; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D011205:Povidone / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D013501:Surface-Active Agents; D012967:Sodium Dodecyl Sulfate; D011205:Povidone