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Nonequilibrium pattern formation in strongly interacting driven colloids
Hartmut Löwen1, Joachim Dzubiella
1Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf Universitätsstrasse 1, D-40225, Düsseldorf Germany. hlowen@thphy.uni-duesseldorf.de
Faraday Discussions
|March 18, 2003
Summary
Strongly interacting colloidal suspensions form stripe patterns when driven by an external field. This study extends findings to asymmetric mixtures and analyzes the dynamic relaxation into these steady states.
Area of Science:
- Physics
- Materials Science
- Chemistry
Background:
- Dynamical instabilities in strongly interacting colloidal suspensions are crucial for understanding nonequilibrium systems.
- Hydrodynamic interactions are neglected in this study to focus on particle-driven dynamics.
Purpose of the Study:
- To investigate stripe pattern formation in colloidal suspensions under external fields.
- To extend previous studies on stripe formation to asymmetric mixtures.
- To analyze the dynamic processes during relaxation into steady states.
Main Methods:
- Brownian dynamics computer simulations were employed.
- Analysis of stripe formation in both symmetric and asymmetric colloidal mixtures.
- Study of transient dynamics including jamming, coarsening, and void formation.
Main Results:
- Spontaneous formation of stripe-like patterns above a critical external drive strength.
- Stripe-like segregation observed in asymmetric mixtures with compression/expansion effects.
- Identification of jamming, anisotropic coarsening, and void formation during relaxation.
Conclusions:
- External fields can induce stripe pattern formation in colloidal suspensions.
- Asymmetric mixtures exhibit unique segregation behaviors and dynamic transitions.
- Understanding transient dynamics is key to comprehending the route to steady states in driven colloidal systems.