Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 41: Colloids and Complex Liquids I

CPP 41.1: Hauptvortrag

Donnerstag, 14. März 2013, 09:30–10:00, H40

Out-of-Equilibriumness of Light Activated Colloids — •jeremie Palacci, Stefano Sacanna, Asher Preska Steinberg, Adrian Vatchinsky, Kasey Hanson, David Pine, and Paul Chaikin — NYU, CSMR, USA

Self-propelled micro-particles are intrinsically out-of-equilibrium. This renders their physics far richer than that of passive colloids while relaxing some thermodynamical constraints and give rise to a wealth phenomena e.g. collective behavior, swarming...

I will present various properties of an assembly of synthetic active microparticles. I will notably introduce a new form of self-assembly originating from non-equilibrium driving forces. When activated by light, a set of new self-propelled particles spontaneously assemble into living crystals which behaves as " self-propelled colloidal carpets" steerable with an external magnetic field. We will show that this phenomenon is intrinsically out-of-equilibrium and originates in the competition between self-propulsion, particles collisions and attractive interactions. The applications and the use of this system for colloidal cargo transportation in microfluidic will also be discussed.