Séminaire Café (Interne)

Il s’agit d’un exposé assez court (20 min) et assez informel.
Prière aux conférenciers de ne jamais dépasser 30 min et de vérifier la compatibilité avec le projecteur AVANT le séminaire.
Les séminaires ont lieu les jeudis après la réunion du laboratoire à 13h30 dans la bibliothèque du labo sur le campus Jussieu, Barre Cassan, Bât A, 1er étage.

Pour suggérer un titre et envoyer un abstract, contacter Lucas Prévost (lucas.prevost [AT] espci.fr).

Prochains séminaires café
21 janvier
28 janvier Anumita Jawahar (Stagiaire M2 au PMMH)
Article presentation : "Vortex arrays and ciliary tangles underlie the feeding–swimming trade-off in starfish larvae" (Nature, 2016)
4 février Botond Tyukodi (Post-doctorant Brandeis University)
Size control and escape mechanisms in geometrically frustrated assemblies
The self-limited assembly of building blocks into structures with large, but well-defined finite sizes, is an essential capability of biological systems. Developing human-engineered building blocks with a similar ability to undergo self-limited assembly is of great interest in nanotechnology. Recently, it has been theoretically proposed that self-limited assembly can be achieved through ‘geometric frustration’, in which the preferred local packing of subunits is incompatible with their preferred large-scaleassembly structure.
In this talk we describe a computational investigation of geometrically frustrated assembly that is motivated by ongoing experiments in which building blocks are designed from DNA origami. Specifically, we consider triangular subunits that self-assemble into a hexagonal array, but have interaction geometries that favor formation of catenoid structures. The resulting negative Gaussian curvature is incompatible with hexagonal order, leading to geometric frustration. We use dynamic Monte Carlo simulations and free energy calculations to demonstrate that this incompatibility can lead to equilibrium self-limited assembly in some parameter regimes. We also identify mechanisms by which the system can escape self-limitation in other parameter regimes, and we identify two relevant dimensionless parameters controlling the equilibrium behavior. The first parameter controls the self-limited size of the catenoids, whereas the second controls their brittleness.
11 février Adam Anglart (Doctorant au PMMH)
Propagating localized structure in a 1D Faraday experiment
04 mars Pas de séminaire : soutenance de Manon L’Estimé
11 mars Ludovic Bellebon (Doctorant au PMMH)
18 mars Julien Lehuen (Doctorant à l’INRAE Montpellier)
Rhéophysique de colonnes granulaires perturbées par un intrus mécanique

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Informations Pratiques

Laboratoire : 01 40 79 45 22
Directeur : Damien Vandembroucq
Codirecteur : Philippe Petitjeans
Administratrice : Frédérique Auger (01 40 79 45 22)
Gestionnaire : Claudette Barez (01 40 79 58 53)
Courriel : dir (arobase) pmmh.espci.fr