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Chin. Phys. B, 2015, Vol. 24(6): 068701    DOI: 10.1088/1674-1056/24/6/068701
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Curvature-induced lipid segregation

Zheng Bina b, Meng Qing-Tiana, Robin L. B. Selingerc, Jonathan V. Selingerc, Ye Fang-Fub
a College of Physics and Electronics, Shandong Normal University, Jinan 250014, China;
b Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics of Chinese Academy of Sciences, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
c Liquid Crystal Institute, Kent State University, Kent, OH 44242, USA
Abstract  

We investigate how an externally imposed curvature influences lipid segregation on two-phase-coexistent membranes. We show that the bending-modulus contrast of the two phases and the curvature act together to yield a reduced effective line tension. On largely curved membranes, a state of multiple domains (or rafts) forms due to a mechanism analogous to that causing magnetic-vortex formation in type-II superconductors. We determine the criterion for such a multi-domain state to occur; we then calculate respectively the size of the domains formed on cylindrically and spherically curved membranes.

Keywords:  curvature      phase separation      lipid membrane      rafts  
Received:  03 April 2015      Revised:  08 April 2015      Accepted manuscript online: 
PACS:  87.16.dt (Structure, static correlations, domains, and rafts)  
  64.75.St (Phase separation and segregation in thin films)  
  61.30.Dk (Continuum models and theories of liquid crystal structure)  
Corresponding Authors:  Ye Fang-Fu     E-mail:  fye@iphy.ac.cn
About author:  87.16.dt; 64.75.St; 61.30.Dk

Cite this article: 

Zheng Bin, Meng Qing-Tian, Robin L. B. Selinger, Jonathan V. Selinger, Ye Fang-Fu Curvature-induced lipid segregation 2015 Chin. Phys. B 24 068701

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