title: Shear induced relaxation of polymer micelles at the solid-liquid interface.
abstract: A 20% aqueous solution of (ethylene oxide) 99-(propylene oxide) 65-(ethylene oxide) 99, F127, was investigated by combining rheology in a cone/plate-geometry and surface-sensitive grazing incident neutron scattering. The crystalline structure formed by the polymer micelles becomes less pronounced for low shear rates, but correlations increase for higher shear rates. After stopping shear a slow relaxation of the micelles is found in the vicinity (50 mum thick layer) of a hydrophilic silicon wall (strong micelle-wall interaction), while a fast relaxation is observed in the boundary layer against the hydrophobic silicon wall (weak micelle-wall interaction). The results show that in the vicinity of the interface wall-particle interactions compete heavily with the shear force acting on the liquid.
authors.affiliation: Institute for Experimental Physics/Solid-State Physics/EP IV, Ruhr-University Bochum, D-44780 Bochum, Germany. v-wolff@ill.eu
authors.forename: Max
authors.initials: M
authors.lastname: Wolff
authors.forename: Roland
authors.initials: R
authors.lastname: Steitz
authors.forename: Philipp
authors.initials: P
authors.lastname: Gutfreund
authors.forename: Nicole
authors.initials: N
authors.lastname: Voss
authors.forename: Stefan
authors.initials: S
authors.lastname: Gerth
authors.forename: Marco
authors.initials: M
authors.lastname: Walz
authors.forename: Andreas
authors.initials: A
authors.lastname: Magerl
authors.forename: Hartmut
authors.initials: H
authors.lastname: Zabel