ESPCI web site
PMMH’s weekly seminar is held every Friday at 11 am (map)
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Andrea Scagliarini (Technische Universiteit van Eindhoven)
Emergent structures and dynamics in suspensions of active colloids
Active fluids, such as suspensions of self-propelled particles or of cytoskeletal filaments and molecular motors, are a fascinating example of soft matter displaying non-trivial collective behaviours which represent issues in non-equilibrium statistical physics. Moreover, the recent development of techniques to assemble miniaturized devices has led to an ever-growing interest for micro- and nano-scale engines that can perform autonomous motion (”microrobots”), as, for instance, self-phoretic colloids, for which the propulsion is induced by the generation of a chemical species in a reaction (locally) catalyzed at the particle surface. I will show results from numerical simulations of suspensions of active colloids, described as resolved finite size particles, interacting with a scalar field according to a coarse-grained model. The numerical implementation has been tested against exact results on the chemotactic behaviour of an isolated particle as well as on the self-propulsion mechanism. The study on suspensions of several particles suggests the existence of a kind of non-equilibrium phase transition from a jammed state to the formation of aggregates, at changing a parameter (dubbed phoretic mobility) accounting for the particle-”fuel” chemical affinity). I will stress how to single out the effect of dynamical correlations among particles arising from hydrodynamics, with respect the quorum-sensing-like coupling due to the concentration field, on the geometry of colloidal cluesters as well as on the dymamics of the jammed state.
The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.
- Séminaires ESPCI-ENS de biophysique
- Séminaires du Département de Physique de l’ENS
- Séminaires du Laboratoire d’Hydrodynamique de l’X
- Séminaire de Mécanique d’Orsay (page web FAST)
- Séminaire de Mécanique d’Orsay (page web LIMSI)
- Séminaire de Mécanique des Fluides de l’Institut Jean le Rond d’Alembert
- Séminaires du laboratoire MSC, Paris VII
- Séminaires Gulliver
Link to cofee seminar (internal, every Thursday)
