Concentration fluctuations and phase transitions in coupled modulated bilayers

Yuichi Hirose, Shigeyuki Komura, David Andelman

Research output: Contribution to journalArticlepeer-review

Abstract

We consider the formation of finite-size domains in lipid bilayers consisting of saturated and hybrid lipids. First, we describe a monolayer model that includes a coupling between a compositional scalar field and a two-dimensional vectorial order parameter. Such a coupling yields an effective two-dimensional microemulsion free energy for the lipid monolayer, and its characteristic length of compositional modulations can be considered as the origin of finite-size domains in biological membranes. Next, we consider a coupled bilayer composed of two modulated monolayers and discuss the static and dynamic properties of concentration fluctuations above the transition temperature. We also investigate the micro-phase separation below the transition temperature and compare the micro-phase separated structures with statics and dynamics of concentration fluctuations above the transition.

Original languageEnglish
Article number021916
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume86
Issue number2
DOIs
StatePublished - 16 Aug 2012

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