Charged bilayer membranes in asymmetric ionic solutions: Phase diagrams and critical behavior

Details Charged bilayer membranes in asymmetric ionic solutions: Phase diagrams and critical behavior Charged bilayer membranes in asymmetric ionic solutions: Phase diagrams and critical behavior

2011-05-16

arxiv.org/abs/1105.3057v3

Physical Review E 84, 031919 (2011)

Physics

Condensed Matter

Soft Condensed Matter

11 pages,6 figures

Scientific paper

10.1103/PhysRevE.84.031919

We consider the phase separation in an asymmetrically charged lipid bilayer membrane consisting of neutral and negatively charged lipids that are in contact with in/out ionic solutions having different ionic strengths. The two asymmetric leaflets are coupled through electrostatic interactions. Based on a free energy approach, the critical point and phase diagrams are calculated for different ionic strength of the two solutions and coupling parameter. An increase of the coupling constant or asymmetry in the salt concentration between the in/out solutions yields a higher phase separation temperature because of electrostatic interactions. As a consequence, the phase-coexistence region increases for strong screening (small Debye length). Finally, possible three-phase coexistence regions in the phase diagram are predicted.

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