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Preparation of Giant Vesicles Encapsulating Microspheres by Centrifugation of a Water-in-oil Emulsion
Published on: January 24, 2017
Critical swelling of particle-encapsulating vesicles
1School of Chemistry, Raymond & Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.
Physical Review Letters
|September 4, 2008
Summary
Encapsulating solute particles within semipermeable vesicles causes them to swell and transition to a maximum volume. This critical behavior is unique to these vesicles, indicating universal swelling dynamics before osmotic lysis.
Area of Science:
- Biophysics
- Physical Chemistry
- Soft Matter Physics
Background:
- Semipermeable vesicles encapsulate solute particles, leading to complex behaviors.
- Vesicle swelling is influenced by particle number and external solution concentration.
- Understanding vesicle dynamics is crucial for biological and synthetic systems.
Purpose of the Study:
- To investigate the phase transition and critical behavior of particle-encapsulating vesicles.
- To characterize the universal swelling dynamics of vesicles approaching their maximum volume.
- To explore the implications for vesicle pressure, surface tension, and osmotic lysis.
Main Methods:
- Theoretical modeling of fluctuating, semipermeable vesicles.
- Analysis of vesicle swelling as a function of particle number and external concentration.
- Identification of phase transitions and critical points.
Main Results:
- A continuous phase transition from a fluctuating to a maximum-volume state was observed.
- Significant pressure differences and surface tension arise at the critical point.
- This criticality is a unique characteristic of particle-encapsulating vesicles.
Conclusions:
- Particle-encapsulating vesicles exhibit universal swelling behavior near their limiting volume.
- The study elucidates the critical phenomena governing vesicle volume and internal pressure.
- Findings provide insights into osmotic lysis mechanisms in such systems.
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