Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
CPP: Chemische Physik und Polymerphysik
CPP 5: SYMPOSIUM: Dynamics of multi-component fluids POSTER
CPP 5.9: Poster
Freitag, 4. März 2005, 17:15–19:00, Poster TU D
Adhesion control of membranes by active stickers — •Bartosz Rozycki1,2, Reinhard Lipowsky2, and Thomas R. Weikl2 — 1Instytut Fizyki Teoretycznej, Uniwersytet Warszawaki, 00-681 Warszawa, Hoza 69, Poland — 2Max-Planck-Institut fur Kolloid- und Grenzflachenforschung, 14424 Potsdam, Germany
Biological membranes actively control their adhesion states. We consider here a simple theoretical model of membranes with active adhesion molecules, or ‘stickers’. The stickers are actively switched ‘on’ or ‘off’, which keeps the system out of thermal equilibrium. We find that the phase behavior of the membranes depends rather sensitively on the switching rates of the stickers, and not only on the fraction of ‘on’-stickers. In the asymptotic regimes of ‘slow’ and ‘fast’ switching, we obtain exact results which relate the unbinding behavior of the active membranes to well-studied properties of equilibrium membranes. Using Monte Carlo simulations, we show that the characteristic crossover time scale between the asymptotic regimes is given by the binding time of the stickers. Our results may provide insights into novel mechanisms for the controlled adhesion of biological or biomimetic membranes.