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Updated: Feb 7, 2026
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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
Published on: October 24, 2017
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Phase interfaces within different vesicle shapes.
Yi Xie1, Kunkun Guo1
1College of Materials Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.
Summary
Giant lipid vesicles exhibit fascinating internal phase interfaces. Researchers developed a theory to understand these interfaces and predict wetting transitions within vesicles.
Area of Science:
- Biophysics
- Soft Matter Physics
- Polymer Science
Background:
- Liquid droplets on surfaces typically have contact angles from 0 to pi.
- Vesicle membranes present unique two-phase interface challenges due to bending forces.
- Recent advancements include giant lipid vesicles with poly(ethylene glycol)/dextran aqueous two-phase systems.
Purpose of the Study:
- To theoretically explore aqueous two phases within giant lipid vesicles.
- To introduce and analyze the intrinsic contact angle for vesicle internal interfaces.
- To investigate wetting and dewetting transitions within these systems.
Main Methods:
- Combined Helfrich curvature elastic theory for vesicle membranes.
- Applied self-consistent field theory for polymer behavior.
- Developed a theoretical framework to model polymer solutions within vesicles.
Main Results:
- Introduced an intrinsic contact angle ([Formula: see text]) to characterize vesicle internal interfaces.
- Investigated the influence of polymer-polymer and polymer-membrane interactions on contact angles.
- Analyzed the impact of polymer volume fraction, membrane impermeability, and spontaneous curvature on wetting transitions.
Conclusions:
- The study provides a theoretical framework for understanding complex interfaces within lipid vesicles.
- The intrinsic contact angle is a key parameter governing wetting and dewetting phenomena.
- This research offers insights into the behavior of phase-separated systems confined within membranes.
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