Next seminar : Séminaire du LPTMS: Jean-Baptiste Delfau

Tuesday, March 28 2017 at 11:00:00

A counter-intuitive case of spontaneous aggregation : crystals of clusters

Jean-Baptiste Delfau (Universitat de les Illes Balears, Palma de Mallorca, Spain)

Particles interacting via purely repulsive soft-core potentials can spontaneously aggregate, despite repelling each other, and form periodic crystals of particle clusters. We studied this phenomenon - relevant to colloidal or polymer solutions - for passive (Brownian) and active (self-propelling) particles at two levels of description: performing numerical simulations of the discrete particle dynamics, and by linear and nonlinear analysis of the corresponding Dean-Kawasaki equations for the macroscopic particle density. In this seminar, I will explain what are the mechanisms of the instability leading to clustering which turn out to be the interplay between diffusion or self-propulsion, the intracluster forces and the forces between neighboring clusters.
References :
  • J.-B. Delfau, H. Ollivier, C. López, B. Blasius & E. Hernández-García, Pattern formation with repulsive soft-core interactions: Discrete particle dynamics and Dean-Kawasaki equation, Phys. Rev. E 94, 042120 (2016)
  • J.-B. Delfau, C. López, E. Hernández-García, Active cluster crystals, arXiv:1701.02639

Last Highlight : Geometry and interactions in self-assembled biological systems

In honour of Françoise Livolant, the LPS (Laboratoire de Physique des Solides) and LPTMS (Laboratoire de Physique Théorique et Modèles Statistiques) are organising an international conference on geometry and interactions in self-assembled biological systems.

We will host a two days conference in Orsay, on March 23-24, 2017. Colleagues and friends are welcome.

Participants may submit their contributions to poster sessions.

Registration is free of charge but mandatory.

The conference will be held at the Institut de Physique Nucléaire (IPN), Orsay (Building 100A), close to the train station Orsay Ville on the RER B line.

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