title: Interpolymer complexation: comparisons of bulk and interfacial structures.
abstract: The interactions between the strong polyelectrolyte sodium poly(styrenesulfonate), NaPSS, and the neutral polymer poly(vinylpyrrolidone), PVP, were investigated in bulk and at the silica/solution interface using a combination of diffusion nuclear magnetic resonance spectroscopy (NMR), small-angle neutron scattering (SANS), solvent relaxation NMR, and ellipsometry. We show for the first time that complex formation occurs between NaPSS and PVP in solution; the complexes formed were shown not to be influenced by pH variation, whereas increasing the ionic strength increases the complexation of NaPSS but does not influence the PVP directly. The complexes formed contained a large proportion of NaPSS. Study of these interactions at the silica interface demonstrated that complexes also form at the nanoparticle interface where PVP is added in the system prior to NaPSS. For a constant PVP concentration and varying NaPSS concentration, the system remains stable until NaPSS is added in excess, which leads to depletion flocculation. Surface complex formation using the layer-by-layer technique was also reported at a planar silica interface.
authors: †Department of Pharmaceutical, Chemical and Environmental Sciences, Faculty of Engineering and Science, University of Greenwich, Medway Campus, Central Avenue, Chatham Maritime, Kent ME4 4TB, U.K.|‡School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K.
authors: Beatrice
authors: B
authors: Cattoz
authors: ‡School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K.|§Membrane Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands.
authors: Wiebe M
authors: WM
authors: de Vos
authors: ‡School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K.
authors: Terence
authors: T
authors: Cosgrove
authors: ∥Port Sunlight Laboratory, Unilever Research, Quarry Road East, Bebington, The Wirral CH63 3JW, U.K.
authors: Martin
authors: M
authors: Crossman
authors: ‡School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K.
authors: Youssef
authors: Y
authors: Espidel
authors: †Department of Pharmaceutical, Chemical and Environmental Sciences, Faculty of Engineering and Science, University of Greenwich, Medway Campus, Central Avenue, Chatham Maritime, Kent ME4 4TB, U.K.|⊥School of Chemical Engineering, UNSW Australia, UNSW Sydney, New South Wales 2052, Australia.
authors: Stuart W
authors: SW
authors: Prescott
mesh_terms: D006863:Hydrogen-Ion Concentration; D009994:Osmolar Concentration; D011137:Polystyrenes / Q000737:chemistry*; D011205:Povidone / Q000737:chemistry*
chemical_list: D011137:Polystyrenes; C003321:polystyrene sulfonic acid; D011205:Povidone