Berlin 2005 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.119: Poster

Montag, 7. März 2005, 15:30–18:00, Poster TU D

Diffusion in a fluctuating membrane — •Ellen Reister and Udo Seifert — II. Institut für theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57/III, 70550 Stuttgart

Experimental techniques, like fluorescence correlation spectroscopy, track the movement of fluorescent probes in membranes in order to determine diffusion constants. However, the deduction of diffusion constants from experimental data generally assumes that diffusion takes place in a plane, although real membranes are subject to thermal fluctuations. We are interested in the interplay of membrane fluctuations and diffusion within a membrane. To study the system we regard Brownian motion of particles on a curved surface. The particles are free to move within the membrane without influencing the membrane shape. The fluctuations of the membrane, that is described by a Helfrich Hamiltonian, lead to a time dependent metric of the curved surface. We calculate the rescaled projected diffusion constant for a fluctuating membrane and estimate the difference between the real and projected diffusion constant under typical experimental conditions.