Matière molle et biophysique - Jean-François Joanny

Jean-François Joanny

Matière molle et biophysique

Collège de France

Année 2026-2027

Computational Soft Matter/Polymer Physics

Conférence - Kurt Kremer: Stimuli Responsive Polymers: Co(non)-Solvency, Co-Solvency…

Kurt Kremer

Max Planck Institute for Polymer Research

Résumé

A material is referred to as stimuli responsive when a slight change in external parameters can drastically alter its structure, function, or stability. Polymers with their delicate entropy-energy interplay at ambient temperatures are especially suitable for such phenomena. Here, the example of polymer properties in solvent mixtures will be discussed. Special emphasis will be given to two prototypical phenomena: co-non-solvency and co-solvency. The first phenomenon is associated with the collapse of polymers in two miscible good solvents, where preferential solvation in one component is shown to trigger the collapse transition. The latter is associated with the swelling of polymers in mixtures of poor solvents, which is connected to depletion competition between different components.

Jean-François Joanny

Matière molle et biophysique

Collège de France

Année 2026-2027

Computational Soft Matter/Polymer Physics

Conférence - Kurt Kremer: Multiscale Modeling of Open Systems

Kurt Kremer

Max Planck Institute for Polymer Research

Résumé

As seen in the other lectures the relation between atomistic structure, architecture, molecular weight and material properties is of basic concern of modern soft matter science. Furthermore, when studying functional systems and in biology, one is faced with nonequilibrium and often driven systems, meaning that permanently energy is consumed and dissipated. Even nowadays it is almost impossible to simulate such systems at sufficient size and for long enough times on an all atom level. Here computer simulations on different levels of resolution play an important role and need to be connected. This is achieved by two different approaches, namely by sequential multiscale descriptions or adaptive schemes, which allow for a free exchange of particles (atoms, molecules) between the different levels of resolution. The latter is the topic of the present lecture. The methodology is introduced and it is shown how this can be applied to truly open, grand canonical simulations of molecular systems.

Jean-François Joanny

Matière molle et biophysique

Collège de France

Année 2026-2027

Computational Soft Matter/Polymer Physics

Conférence - Kurt Kremer: Some New Aspects of the Glass Transition in Simple Polymer Melts

Kurt Kremer

Max Planck Institute for Polymer Research

Résumé

The general physics of the glass transition is still a matter of intense research. Furthermore, many polymeric materials in practical use are in the glassy state. Glass formers are characterized as strong or fragile, meaning that the observed viscosity, while approaching the glass transition temperature, either follows the Arrhenius law (strong) or the KWW (Kohlrausch Williams Watts) law (fragile), the latter denoting a much stronger temperature dependency. The latter is important for many industrial production processes. Polymers are fragile glass formers and prototypical materials to investigate the glass transition. The deviation from the Arrhenius law is called fragility. In the lecture an adjusted model to study the glass transition of polymer melts will be introduced and applied. Furthermore, a new data driven method to identify first signals of approaching the glass transition upon cooling will be discussed.

Jean-François Joanny

Matière molle et biophysique

Collège de France

Année 2026-2027

Computational Soft Matter/Polymer Physics

Conférence - Kurt Kremer: Topology Effects: Playing with Entanglements to Structure Polymer Melts

Kurt Kremer

Max Planck Institute for Polymer Research

Résumé

The dynamics of dense polymer systems of long chains is governed by the fact that chains cannot cut through each other during their diffusive motion. These (temporary) topological constraints create what is called entanglements and dominate the rheological properties of long chain polymer melts and dense solutions. They lead to the well established reptation/tube model, which is at the basis of our understanding of many physical properties and technical processes. While in most technology related investigations entanglements are seen as a problem to deal with, one also can systematically employ them to manipulate and structure materials, either by avoiding or explicitly using/introducing entanglements. The lecture will give a few such examples, which range from non-entangled to highly entangled polymer systems and to new entanglement stabilized nanoporous films or topological glasses in active systems.

Jean-François Joanny

Matière molle et biophysique

Collège de France

Année 2025-2026

06 - Transport dans la cellule : Dynamique des endosomes

Jean-François Joanny

Matière molle et biophysique

Collège de France

Année 2025-2026

Patricia Bassereau

Institut Curie Paris

Séminaire - Patricia Bassereau : Membrane Trafficking in a Test Tube

Jean-François Joanny

Matière molle et biophysique

Collège de France

Année 2025-2026

05 - Transport dans la cellule : Appareil de Golgi

Jean-François Joanny

Chaire Chaire Matière molle et biophysique

Collège de France

Année 2025-2026

Pierre Sens

Institut Curie Paris

Séminaire - Pierre Sens : Modelling Self-Organisation and Transport in Cellular Organelles with Non-Equilibrium Dynamics

Jean-François Joanny

Matière molle et biophysique

Collège de France

Année 2025-2026

04 - Transport dans la cellule : Réticulum endoplasmique

Jean-François Joanny

Matière molle et biophysique

Collège de France

Année 2025-2026

Bruno Goud

Institut Curie Paris

Séminaire - Bruno Goud : Régulation de la voie de sécrétion par les GTPases