Regensburg 2007 – scientific programme

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BP: Fachverband Biologische Physik

BP 26: Poster Session II

BP 26.2: Poster

Thursday, March 29, 2007, 17:00–19:30, Poster B

Solvent and lipid self-dynamics of hydrated lipid-bilayers. — •Florian Kargl, Peter Berntsen, Christer Svanberg, and Jan Swenson — Department of Applied Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden

We report on the microscopic dynamics of a lipid-bilayer system that is hydrated with approximately nine water molecules per lipid molecule. The system was investigated by means of quasielastic neutron scattering (QENS). To independently study the water, the acyl-chain and the polar headgroup motion, selective deuteration was used. We discuss the temperature dependence of the elastic amplitudes measured for motions parallel and perpendicular to the bilayers in the range of 50 K to 310 K. Moreover, the q-dependence of the relaxation processes on time-scales of 10 ps to 100 ps are studied at 290 K, a temperature that is just below the gel to fluid transition. The neutron scattering data is compared to recently performed dielectric measurements that accessed the relaxation dynamics over eight decades in frequency and for a large range of temperatures [1].

[1] P. Berntsen, C. Svanberg, and J. Swenson (in preparation)