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Phase separation of passive particles in active liquids
Pragya Kushwaha1, Vivek Semwal2, Sayan Maity1
1Indian Institute of Science Education and Research, Pune 411008, India.
Physical Review. E
|October 18, 2023
Summary
Passive colloids form dynamic clusters in active liquids, driven by particle activity and an effective attraction. Cluster size increases with passive particle size, potentially leading to phase separation.
Area of Science:
- Colloid Science
- Soft Matter Physics
- Active Matter
Background:
- Extensive research exists on colloidal particle transport in active liquids.
- Understanding of passive and active particle interactions is deepening.
- However, the phase behavior of colloids in active media remains under-explored.
Purpose of the Study:
- Investigate the phase behavior of passive colloids in active particle suspensions.
- Explore the mechanisms behind dynamic clustering and phase separation.
Main Methods:
- Combined experimental and numerical simulations.
- Dispersed passive colloids in suspensions of active particles.
Main Results:
- Observed dynamic clustering of passive colloids in active media.
- Clustering arises from interplay between particle activity and effective attraction.
- Effective potential strength depends on the size ratio of passive to active particles.
- Cluster size increases with the relative size of passive particles.
- Macroscopic phase separation occurs at large size ratios.
Conclusions:
- Particle size ratio significantly influences effective interactions and phase behavior.
- Density fluctuations of active particles impact inter-colloid interactions.
- Findings provide insights into the complex phase dynamics of colloidal systems in active environments.
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