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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
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Modeling the phase separation in binary lipid membrane under externally imposed oscillatory shear flow.

Xiao-Bo Chen1, Li-Sha Niu, Hui-Ji Shi

  • 1Key Laboratory of Failure Mechanics, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, PR China.

Colloids and Surfaces. B, Biointerfaces
|May 27, 2008
PubMed
Summary

Phase separation in binary lipid membranes is modeled using modified Ginzburg-Landau equations and the Cell Dynamical System approach. The study investigates how oscillatory shear flow affects membrane domain size and rheological properties.

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Biophysics

Background:

  • Binary lipid membranes exhibit complex phase behavior crucial for cellular functions.
  • Understanding phase separation dynamics is key to controlling membrane properties.
  • Externally applied forces can significantly influence membrane morphology and behavior.

Purpose of the Study:

  • To numerically model phase separation in binary lipid membranes under oscillatory shear flow.
  • To investigate the effects of shear flow frequency and amplitude on domain evolution.
  • To analyze the resulting rheological properties of the membrane system.

Main Methods:

  • Modification of the two-dimensional time-dependent Ginzburg-Landau (TDGL) equations.
  • Numerical modeling using the Cell Dynamical System (CDS) approach.
  • Analysis of visualized membrane shapes, scattering patterns, domain growth laws, and rheological properties.

Main Results:

  • Visualizations show distinct membrane shapes and scattering patterns under shear flow.
  • Quantitative analysis reveals time growth laws for domain sizes parallel and perpendicular to the flow.
  • Peculiar rheological properties, including normal stress difference and viscoelastic moduli, were observed.

Conclusions:

  • Oscillatory shear flow significantly influences phase separation dynamics in binary lipid membranes.
  • The Cell Dynamical System approach effectively models these complex phenomena.
  • The study provides insights into the relationship between membrane structure and rheological response.