Tunable long range forces mediated by self-propelled colloidal hard spheres.

@article{Ni2015TunableLR,
  title={Tunable long range forces mediated by self-propelled colloidal hard spheres.},
  author={Ran Ni and Martien A Cohen Stuart and Peter G. Bolhuis},
  journal={Physical review letters},
  year={2015},
  volume={114 1},
  pages={018302}
}
Using Brownian dynamics simulations, we systematically study the effective interaction between two parallel hard walls in a 2D suspension of self-propelled (active) colloidal hard spheres, and we find that the effective force between two hard walls can be tuned from a long range repulsion into a long range attraction by changing the density of active particles. At relatively high densities, the active hard spheres can form a dynamic crystalline bridge, which induces a strong oscillating long… CONTINUE READING

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