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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
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Understanding charged vesicle suspensions as Wigner glasses: dynamical aspects
G Porpora1, F Rusciano1, V Guida2
1Department of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le Tecchio 80, Naples 80125, Italy.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 27, 2020
Summary
Charged vesicle suspensions exhibit glass-like behavior, slowing down dynamics and becoming heterogeneous. Lowering salt concentration significantly enhances this glassy state, crucial for product stability.
Area of Science:
- Colloid and Surface Science
- Soft Matter Physics
- Computational Chemistry
Background:
- Suspensions of charged vesicles are common in nature and industry.
- Understanding their behavior is key for formulating products like liquid fabric softeners.
Purpose of the Study:
- Investigate the dynamics of bidisperse colloidal suspensions.
- Focus on experimentally relevant parameters for consumer products.
- Analyze the impact of salt concentration and volume fraction on system dynamics.
Main Methods:
- Brownian dynamics simulations of colloidal beads.
- Modeling hard-core and electrostatic double-layer interactions.
- Analysis of structural relaxation times and dynamic heterogeneity.
Main Results:
- Increasing volume fraction leads to slower, heterogeneous dynamics, indicating a glass transition.
- Decreasing salt concentration steepens the emergence of glassy dynamics, even below hard-sphere transitions.
- System behavior is consistent with a Wigner glass model.
Conclusions:
- Glassy dynamics significantly influence the stability of charged vesicle suspensions.
- Long-range repulsive interactions stabilize low-density glassy states.
- Findings are relevant for optimizing formulations in consumer products.
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