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PHYSICAL REVIEW E 84, 031919 (2011) Charged bilayer membranes in asymmetric ionic solutions: Phase diagrams and critical behavior
 

Summary: PHYSICAL REVIEW E 84, 031919 (2011)
Charged bilayer membranes in asymmetric ionic solutions: Phase diagrams and critical behavior
Naofumi Shimokawa*
Institute of Industrial Science, University of Tokyo, Tokyo 153-8505, Japan
Shigeyuki Komura
Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Tokyo 192-0397, Japan, and
Kavli Institute for Theoretical Physics China, CAS, Beijing 100190, China
David Andelman
Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Ramat Aviv 69978, Tel Aviv, Israel, and
Kavli Institute for Theoretical Physics China, CAS, Beijing 100190, China
(Received 17 May 2011; published 19 September 2011)
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 and 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 strengths of the two solutions and coupling
parameter. An increase of the coupling constant or asymmetry in the salt concentration between the in and 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.
DOI: 10.1103/PhysRevE.84.031919 PACS number(s): 87.16.D-, 64.60.-i, 64.75.-g

  

Source: Andelman, David - School of Physics and Astronomy, Tel Aviv University

 

Collections: Materials Science; Physics