Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 11: INTERNAL SYMPOSIUM Scattering Experiments II

CPP 11.4: Talk

Tuesday, March 27, 2007, 15:00–15:15, H37

Influence of spacer length and density on the vertical structures of supported membranes studied by neutron reflectivity — •Peter Seitz¹, Oliver Purrucker², Anton Förtig³, Raimund Gleixner⁴, Giovanna Fragneto⁵, Rainer Jordan³, and Motomu Tanaka^1,2 — ¹Physikalisch-Chemisches Institut, Universität Heidelberg, Germany — ²Physik-Department E22, Technische Universität München, Germany — ³Institut für Technische Chemie, Technische Universität München, Germany — ⁴Max Planck Institute of Biochemistry, Martinsried, Germany — ⁵Institut Laue-Langevin, Grenoble, France

We studied the structure of a new class of polymer-supported membranes, which are separated from the solid substrate via poly(2-methyl-2-oxazoline) spacers of defined length, functionalized with a surface coupling group and hydrophobic membrane anchors. The proximal leaflet was deposited via Langmuir-Blodgett transfer, followed by vesicle fusion to deposit the distal layer. Precise control of the polymer chain length and its lateral density enables the quantitative adjustment of the thickness and the viscosity of the polymer interlayer. Previously, we measured the membrane-substrate distance with fluorescence interference contrast microscopy (FLIC). To gain a deeper insight to the vertical structure of the membrane, we conducted specular neutron reflectivity experiments under a systematic variation of the spacer length and density, and calculated the static roughness and the volume fraction of water in the polymer interlayer.