Berlin 2012 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 18: Posters: Statistical Physics in Biological Systems

BP 18.24: Poster

Mittwoch, 28. März 2012, 17:30–19:30, Poster A

Poisson ratio and local stress in the phospholipid membrane — •tayebeh jadidi¹, Alireza Mashaghi^2,3, Hamid Seyyed-Allaei⁴, Philipp Maass¹, and Mohammad Reza Rahimi Tabar^1,4 — ¹university of osnabrueck, osnabrueck, Germany — ²FOM Institute AMOLF, Science Park 104, 1098XG Amsterdam, The Netherlands — ³ETH Zürich, Department of Materials, Wolfgang-Pauli-Strasse 10, CH-8093 Zürich, Switzerland — ⁴Department of Physics, Sharif University of Technology, 11365-9161, Tehran, Iran

We calculate the poisson’s ratio and local stress tensor of the lipid bilayer membrane at gel-, fluid-, interdigitated- and ripple phases. We propose a general algorithm for calculating Poisson’s ratio for membranes with periodic boundary conditions; we show that gel-phase lipid membranes has a positive Poisson’s ratio and therefore do not behave like crystalline (polymerized) membranes. The distribution of locally stored energy is calculated from the stress tensor for membrane at different phases and the stability of the ripple phase is studied by determining the ripple-gel transition energy barrier. Finally we report on the thermal expansivity of the lipid membrane.