ISSP - The institute for Solid State Physics

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[TheorySeminar]
Dynamics of confined membranes
Date : Friday, October 20th, 2017 16:00 - 17:00 Place : Seminar Room 5 (A615), 6th Floor, ISSP Lecturer : Dr. Olivier Pierre-Louis Affiliation : CNRS-ILM, Universite Lyon-1 Committee Chair : Hiroshi NOGUCHI (ex.63265)

Bilayer lipid membranes are abundant in biological systems. They are found in cell membranes, skin, pupils, articulations and pulmonary organs. In biological environments, these membranes are often confined by other membranes or by various substrates. We have investigated the role of confinement on the dynamics of lipid membranes.
We first derive a lubrication model for an inextensible bilayer lipid membrane confined between two parallel and flat attractive walls. The resulting model shares similarity the Swift-Hohenberg equation, and with standard coarsening models such as the time-dependent Ginzburg-Landau equation or the Cahn-Hilliard equation. However, our model exhibits a specific behavior controlled by the fixed total quantity of lipids in the system, which imposes a constant total membrane area.
We find that membranes with smaller intrinsic areas form frozen finite-size flat adhesion domains, while membranes with a larger intrinsic area form a frozen labyrinthine wrinkle phase. For intermediate areas, coarsening is found, i.e. an endless increase of the size of adhesion domains. This coarsening behavior is associated to a coexistence between flat adhesion domains and wrinkle domains.


(Published on: Friday October 6th, 2017)