Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 11: DRG-DPG SYMPOSIUM Rheology III
CPP 11.8: Vortrag
Dienstag, 26. Februar 2008, 12:00–12:15, C 264
Near-surface dynamics explored by grazing incidence neutron techniques — •Marco Walz1, Max Wolff2, Nicole Voss1, Hartmut Zabel2, and Andreas Magerl1 — 1Chair for Crystallography and Structural Physics, University of Erlangen-Nürnberg, Staudtstr. 3, 91058 Erlangen — 2Chair for Condensed Matter Physics, Ruhr-University Bochum, Universitätsstr. 150, 44780 Bochum
An understanding of boundary slip requires a knowledge of the structural and dynamical properties of interface regions on short length scales, and experimental methods with pronounced interfacial response are needed. To highlight the properties of the boundary layer we carried out for the first time a neutron spin-echo experiment under condition of grazing incidence (GINSE). With an aqueous solution of a tri-block copolymer with micellar orderings we could verify that the investigation of the dynamics of the sample is well feasible with GINSE, and we present first data taken near the critical angle of total reflection. It appears that the diffusive motion at the hydrophilic (attractive) interface is reduced as compared to a hydrophobic (repulsive) interface.
The authors gratefully acknowledge the financial support by the DFG grants MA801/12-1 and ZA161/18-1 within the priority program (SPP) 1164 and the BMBF grant ADAM 04ZAE8BO.