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Dynamics and separation of circularly moving particles in asymmetrically patterned arrays
C Reichhardt1, C J Olson Reichhardt
1Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 USA.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 16, 2013
Summary
This study shows how particles moving in circles can be separated using L-shaped obstacles. Different swimming radii and chiralities lead to distinct rectified motions, enabling particle sorting.
Area of Science:
- Physics
- Soft Matter Physics
- Non-equilibrium Systems
Background:
- Active and driven matter systems often exhibit circular motion.
- Particles can display chirality, influencing their movement dynamics.
- External drives can induce circular motion in passive particles.
Purpose of the Study:
- To investigate the dynamics of circular-moving particles interacting with asymmetric obstacles.
- To explore particle rectification and separation based on swimming radius and chirality.
- To understand the role of periodic obstacle arrays in controlling particle motion.
Main Methods:
- Simulating particles with defined swimming radii and chiralities.
- Analyzing particle trajectories in the presence of periodic L-shaped obstacles.
- Identifying dynamical phases and regimes of rectified motion.
Main Results:
- Discovered dynamical phases dependent on swimming radius, including rectified DC motion.
- Demonstrated particle separation based on differences in swimming radii and chirality.
- Identified specific swimming radii windows for rectification linked to periodic orbits.
- Observed robustness and enhancement of rectification with thermal or diffusive effects.
Conclusions:
- Asymmetric L-shaped obstacles can rectify circular particle motion.
- Particle separation is achievable by tuning swimming radius and exploiting chirality.
- Rectification phenomena are robust and can be influenced by thermal fluctuations.
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