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DY: Fachverband Dynamik und Statistische Physik

DY 17: Complex Fluids - organized by Christine M. Papadakis (Technical University of Munich, Garching) (joint session CPP/DY)

DY 17.9: Vortrag

Dienstag, 23. März 2021, 14:00–14:20, CPPb

Charge regulation radically modifies electrostatics in membrane stacks — •Arghya Majee1, Markus Bier1,2, Ralf Blossey3, and Rudolf Podgornik41MPI for Intelligent Systems, Stuttgart & University of Stuttgart, Germany — 2University of Applied Sciences, Würzburg-Schweinfurt, Germany — 3University of Lille, CNRS, UMR8576 UGSF, France — 4CAS & KAVLI Institute of Theoretical Sciences, Beijing

Motivated by biological membrane-containing organelles in plants and photosynthetic bacteria, we study charge regulation in a model membrane stack [1]. Considering (de)protonation as the simplest mechanism of charge equilibration between the membranes and with the bathing environment [2], we uncover a symmetry-broken charge state in the stack with a quasiperiodic effective charge sequence. In the case of a monovalent bathing salt solution, our model predicts complex, inhomogeneous charge equilibria depending on the strength of the (de)protonation reaction, salt concentration, and membrane size. Our results shed light on the basic reorganization mechanism of thylakoid membrane stacks.

References:

[1] A. Majee, M. Bier, R. Blossey, and R. Podgornik, Phys. Rev. E 100, 050601(R) (2019).

[2] A. Majee, M. Bier, and R. Podgornik, Soft Matter 14, 985 (2018).

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