Living Crystals of Light-Activated Colloidal Surfers. Palacci, J., Sacanna, S., Steinberg, A., P., Pine, D., J., & Chaikin, P., M. SCIENCE, 339(6122):936-940, AMER ASSOC ADVANCEMENT SCIENCE, 2, 2013. abstract bibtex Spontaneous formation of colonies of bacteria or flocks of birds are
examples of self-organization in active living matter. Here, we
demonstrate a form of self-organization from nonequilibrium driving
forces in a suspension of synthetic photoactivated colloidal particles.
They lead to two-dimensional ``living crystals,'' which form, break,
explode, and re-form elsewhere. The dynamic assembly results from a
competition between self-propulsion of particles and an attractive
interaction induced respectively by osmotic and phoretic effects and
activated by light. We measured a transition from normal to giant-number
fluctuations. Our experiments are quantitatively described by simple
numerical simulations. We show that the existence of the living crystals
is intrinsically related to the out-of-equilibrium collisions of the
self-propelled particles.
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abstract = {Spontaneous formation of colonies of bacteria or flocks of birds are
examples of self-organization in active living matter. Here, we
demonstrate a form of self-organization from nonequilibrium driving
forces in a suspension of synthetic photoactivated colloidal particles.
They lead to two-dimensional ``living crystals,'' which form, break,
explode, and re-form elsewhere. The dynamic assembly results from a
competition between self-propulsion of particles and an attractive
interaction induced respectively by osmotic and phoretic effects and
activated by light. We measured a transition from normal to giant-number
fluctuations. Our experiments are quantitatively described by simple
numerical simulations. We show that the existence of the living crystals
is intrinsically related to the out-of-equilibrium collisions of the
self-propelled particles.},
bibtype = {article},
author = {Palacci, Jeremie and Sacanna, Stefano and Steinberg, Asher Preska and Pine, David J and Chaikin, Paul M},
journal = {SCIENCE},
number = {6122}
}
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