Active Particles in Complex and Crowded Environments

@article{Bechinger2016ActivePI,
  title={Active Particles in Complex and Crowded Environments},
  author={Clemens Bechinger and R. Di Leonardo and Hartmut Lowen and C. J. O. Reichhardt and Giorgio Volpe and Giovanni Volpe},
  journal={Reviews of Modern Physics},
  year={2016},
  volume={88},
  pages={045006}
}
Differently from passive Brownian particles, active particles, also known as self-propelled Brownian particles or microswimmers and nanoswimmers, are capable of taking up energy from their environment and converting it into directed motion. Because of this constant flow of energy, their behavior can be explained and understood only within the framework of nonequilibrium physics. In the biological realm, many cells perform directed motion, for example, as a way to browse for nutrients or to… 
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References

SHOWING 1-10 OF 538 REFERENCES
Active Brownian motion tunable by light.
TLDR
It is shown that the illumination-borne heating induces a local asymmetric demixing of the binary mixture, generating a spatial chemical concentration gradient which is responsible for the particle's self-diffusiophoretic motion.
Statistical physics of self-propelled particles
Self-propelled particles (SPP) are a modern topic of interdisciplinary research at the frontier between physics and biology. These entities take up energy from their environment and convert (a part
Statistical mechanics and hydrodynamics of bacterial suspensions
TLDR
This work derives a continuum description of a suspension of active organisms that incorporates fluid-mediated, long-range hydrodynamic interactions among the swimmers, and demonstrates that hydrod dynamic interactions provide a simple, generic origin for several nonequilibrium phenomena predicted or observed in the literature.
Microswimmers in patterned environments
TLDR
A novel species of microswimmers whose active motion is due to the local demixing of a critical binary liquid mixture and can be easily tuned by illumination is developed, which can be employed to develop advanced sorting, classification and dialysis techniques.
Clusters, asters, and collective oscillations in chemotactic colloids.
TLDR
This work presents a comprehensive theoretical description of gradient-sensing of an individual swimmer, leading controllably to chemotactic or anti-chemotactic behavior, and uses it to construct a framework for studying their collective behavior.
From Clarkia to Escherichia and Janus: the physics of natural and synthetic active colloids
TLDR
In these lectures, a pedagogical introduction to the physics of single-particle and collective properties of active colloids, focussing on self propulsion is given.
Rheotaxis of spherical active particles near a planar wall.
TLDR
It is shown that, for a broad class of spherical active particles, rheotactic behavior may emerge via a mechanism which involves "self-trapping" near a hard wall owing to the active propulsion of the particles, combined with their rotation, alignment, and "locking" of the direction of motion into the shear plane.
Disorder-mediated crowd control in an active matter system
TLDR
It is demonstrated that the presence of spatial disorder can alter the long-term dynamics in a colloidal active matter system, making it switch between gathering and dispersal of individuals.
Living Crystals of Light-Activated Colloidal Surfers
TLDR
A form of self-organization from nonequilibrium driving forces in a suspension of synthetic photoactivated colloidal particles is demonstrated, which leads to two-dimensional "living crystals," which form, break, explode, and re-form elsewhere.
Artificial Brownian motors: Controlling transport on the nanoscale
In systems possessing spatial or dynamical symmetry breaking, Brownian motion combined with unbiased external input signals, deterministic and random alike, can assist directed motion of particles at
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