Matière molle et biophysique - Jean-François Joanny

Collège de France
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Jean-François Joanny a commencé sa carrière au CNRS où il a occupé un poste de chargé de recherche au sein du laboratoire de physique de la matière condensée du Collège de France à Paris, puis à Lyon. Il a été nommé professeur de physique à l'université Louis-Pasteur à Strasbourg en 1989, puis professeur à l'université Pierre-et-Marie-Curie (UPMC) en 2003. Physicien, c'est avant tout un théoricien qui a travaillé sur divers aspects de la physique de la matière molle, puis de la physique pour la biologie.

  1. 2 JUIN

    Conférence - Mark Bowick - Nonabelian Topological Defects

    Jean-François Joanny Matière molle et biophysique Collège de France Année 2024-2025 Conférence - Mark Bowick - Nonabelian Topological Defects Mark Bowick Deputy Director, Kavli Institute for Theoretical Physics, University of California Santa Barbara Mark Bowick est invité par l'assemblée du Collège de France sur proposition du professeur Jean-François Joanny, chaire Matière molle et biophysique. The line defects of three dimensional uniaxial nematics have a simple abelian algebra governing their interactions and so simply pass through one another. I will discuss, instead, biaxial nematics for which the fundamental group is non-abelian. As a result they exhibit topological entanglement/rigidity, trivalent junctions and associated networks, and stable bound states of pairs of disclinations. They can be experimentally realized in chiral nematics or in hybrid molecular-colloidal systems, realizing the notion of topological rigidity envisaged 50 years ago by Poenaru and Toulouse. Mark Bowick Mark Bowick was born in New Zealand, obtained his B.Sc.(Hons) from the University of Canterbury (New Zealand) and a Ph.D. in theoretical particle physics from Caltech in 1983. This was followed by a Research Associate position in the Particle Theory Group at Yale, winning the First prize award in the 1986 Gravity Research Foundation Essay Competition. This was followed by a postdoctoral position in the Center for Theoretical Physics at MIT. He joined the faculty of the Physics Department at Syracuse University in 1987, holding an Outstanding Junior Investigator award from the Department of Energy from 1987-1993 and becoming Full Professor of Physics in 1998. His research career has been split between theoretical high-energy physics and condensed matter (principally soft matter). He was elected a Fellow of the American Physical Society (Division of Condensed Matter Physics) in 2004 and Fellow of the American Association for the Advancement of Science in 2022. He received the Chancellor's Citation for Exceptional Academic Achievement in 2006 (Syracuse University) and the William Wasserstrom Prize for Excellence in Graduate Teaching and Advising in 2009 (Syracuse University). From 2011-2016 he was Director of the Soft Matter Program at Syracuse University. Since 2016 Bowick has been Deputy Director of the Kavli Institute for Theoretical Physics (Santa Barbara) and Distinguished Visiting Professor of Physics at the University of California Santa Barbara.

    1 h 1 min

  2. 26 MAI

    Conférence - Mark Bowick - Order in Biological Development

    Jean-François Joanny Matière molle et biophysique Collège de France Année 2024-2025 Conférence - Mark Bowick - Order in Biological Development Mark Bowick Deputy Director, Kavli Institute for Theoretical Physics, University of California Santa Barbara Mark Bowick est invité par l'assemblée du Collège de France sur proposition du professeur Jean-François Joanny, chaire Matière molle et biophysique. Résumé How does a biological system set up a body plan to produce a final organism with everything in the right place and orientation? I will discuss a developmental system (parhyale) that exploits activity and cell division to establish four-fold orientational order with the flexibility of a liquid but the structural rigidity arising from orientational order. Such ideas can be tested in active (self-propelled) Voronoi models of tissue that include cell division. Mark Bowick Mark Bowick was born in New Zealand, obtained his B.Sc.(Hons) from the University of Canterbury (New Zealand) and a Ph.D. in theoretical particle physics from Caltech in 1983. This was followed by a Research Associate position in the Particle Theory Group at Yale, winning the First prize award in the 1986 Gravity Research Foundation Essay Competition. This was followed by a postdoctoral position in the Center for Theoretical Physics at MIT. He joined the faculty of the Physics Department at Syracuse University in 1987, holding an Outstanding Junior Investigator award from the Department of Energy from 1987-1993 and becoming Full Professor of Physics in 1998. His research career has been split between theoretical high-energy physics and condensed matter (principally soft matter). He was elected a Fellow of the American Physical Society (Division of Condensed Matter Physics) in 2004 and Fellow of the American Association for the Advancement of Science in 2022. He received the Chancellor's Citation for Exceptional Academic Achievement in 2006 (Syracuse University) and the William Wasserstrom Prize for Excellence in Graduate Teaching and Advising in 2009 (Syracuse University). From 2011-2016 he was Director of the Soft Matter Program at Syracuse University. Since 2016 Bowick has been Deputy Director of the Kavli Institute for Theoretical Physics (Santa Barbara) and Distinguished Visiting Professor of Physics at the University of California Santa Barbara.

    1 h 13 min

  3. 20 MAI

    Conférence - Mark Bowick - Membranes – Control by Geometry in Graphene Statistical Mechanics

    Jean-François Joanny Matière molle et biophysique Collège de France Année 2024-2025 Conférence - Mark Bowick - Membranes – Control by Geometry in Graphene Statistical Mechanics Mark Bowick Deputy Director, Kavli Institute for Theoretical Physics, University of California Santa Barbara Mark Bowick est invité par l'assemblée du Collège de France sur proposition du professeur Jean-François Joanny, chaire Matière molle et biophysique. Résumé Thermalized elastic membranes show strong scale-dependence of their elastic moduli. A beautiful realization is in the physics of thermalized 2D metamaterials, such as graphene, where thermal effects already set in at microscopic length scales. This opens the way to generating materials of any required modulus from one source material in different geometrical regimes and to the manipulation of nano and micromechanical systems by geometry, rather than external fields. Mark Bowick Mark Bowick was born in New Zealand, obtained his B.Sc.(Hons) from the University of Canterbury (New Zealand) and a Ph.D. in theoretical particle physics from Caltech in 1983. This was followed by a Research Associate position in the Particle Theory Group at Yale, winning the First prize award in the 1986 Gravity Research Foundation Essay Competition. This was followed by a postdoctoral position in the Center for Theoretical Physics at MIT. He joined the faculty of the Physics Department at Syracuse University in 1987, holding an Outstanding Junior Investigator award from the Department of Energy from 1987-1993 and becoming Full Professor of Physics in 1998. His research career has been split between theoretical high-energy physics and condensed matter (principally soft matter). He was elected a Fellow of the American Physical Society (Division of Condensed Matter Physics) in 2004 and Fellow of the American Association for the Advancement of Science in 2022. He received the Chancellor's Citation for Exceptional Academic Achievement in 2006 (Syracuse University) and the William Wasserstrom Prize for Excellence in Graduate Teaching and Advising in 2009 (Syracuse University). From 2011-2016 he was Director of the Soft Matter Program at Syracuse University. Since 2016 Bowick has been Deputy Director of the Kavli Institute for Theoretical Physics (Santa Barbara) and Distinguished Visiting Professor of Physics at the University of California Santa Barbara.

    1 h 8 min

  4. 12 MAI

    Conférence - Mark Bowick - Order, Geometry and Defects: Facets of Order

    Jean-François Joanny Matière molle et biophysique Collège de France Année 2024-2025 Conférence - Mark Bowick - Order, Geometry and Defects: Facets of Order Mark Bowick Deputy Director, Kavli Institute for Theoretical Physics, University of California Santa Barbara Mark Bowick est invité par l'assemblée du Collège de France sur proposition du professeur Jean-François Joanny, chaire Matière molle et biophysique. Résumé Sharp structures can occur as minimizers of very regular problems. This means symmetry can lead us badly astray and the resultant symmetry breaking may lead to highly counter-intuitive structures. I will illustrate in a discrete example and then some continuous examples. The main soft matter example will be the emergence of faceted shapes as the ground states of liquid-crystalline vesicles and the novel ground states of crystalline order on a 2-sphere. Mark Bowick Mark Bowick was born in New Zealand, obtained his B.Sc.(Hons) from the University of Canterbury (New Zealand) and a Ph.D. in theoretical particle physics from Caltech in 1983. This was followed by a Research Associate position in the Particle Theory Group at Yale, winning the First prize award in the 1986 Gravity Research Foundation Essay Competition. This was followed by a postdoctoral position in the Center for Theoretical Physics at MIT. He joined the faculty of the Physics Department at Syracuse University in 1987, holding an Outstanding Junior Investigator award from the Department of Energy from 1987-1993 and becoming Full Professor of Physics in 1998. His research career has been split between theoretical high-energy physics and condensed matter (principally soft matter). He was elected a Fellow of the American Physical Society (Division of Condensed Matter Physics) in 2004 and Fellow of the American Association for the Advancement of Science in 2022. He received the Chancellor's Citation for Exceptional Academic Achievement in 2006 (Syracuse University) and the William Wasserstrom Prize for Excellence in Graduate Teaching and Advising in 2009 (Syracuse University). From 2011-2016 he was Director of the Soft Matter Program at Syracuse University. Since 2016 Bowick has been Deputy Director of the Kavli Institute for Theoretical Physics (Santa Barbara) and Distinguished Visiting Professor of Physics at the University of California Santa Barbara.

    1 h 8 min

  5. 14/05/2024

    Conférence - Alexander Grosberg : Chromatin Hydrodynamics

    Jean-François Joanny Matière molle et biophysique Collège de France Année 2023-2024 Polymer Physics in Cell Nucleus Conférence - Alexander Grosberg : Chromatin Hydrodynamics Alexander Grosberg Professeur de physique et de mathématiques, université de New York

    1 h 8 min

  6. 07/05/2024

    Conférence - Alexander Grosberg : Activity Driven Folding and Segregation

    Jean-François Joanny Matière molle et biophysique Collège de France Année 2023-2024 Polymer Physics in Cell Nucleus Conférence - Alexander Grosberg : Activity Driven Folding and Segregation Alexander Grosberg Professeur de physique et de mathématiques, université de New York

    1 h 1 min

  7. 30/04/2024

    Conférence - Alexander Grosberg : Equilibrium Polymer Models

    Jean-François Joanny Matière molle et biophysique Collège de France Année 2023-2024 Polymer Physics in Cell Nucleus Conférence - Alexander Grosberg : Equilibrium Polymer Models Alexander Grosberg Professeur de physique et de mathématiques, université de New York

    1 h 1 min

  8. 23/04/2024

    Conférence - Alexander Grosberg : Phenomenology: Chromatin is a Functional Form of DNA in the Cell

    Jean-François Joanny Matière molle et biophysique Collège de France Année 2023-2024 Polymer Physics in Cell Nucleus Conférence - Alexander Grosberg : Phenomenology: Chromatin is a Functional Form of DNA in the Cell Alexander Grosberg Professeur de physique et de mathématiques, université de New York

    1 h 16 min
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À propos

Jean-François Joanny a commencé sa carrière au CNRS où il a occupé un poste de chargé de recherche au sein du laboratoire de physique de la matière condensée du Collège de France à Paris, puis à Lyon. Il a été nommé professeur de physique à l'université Louis-Pasteur à Strasbourg en 1989, puis professeur à l'université Pierre-et-Marie-Curie (UPMC) en 2003. Physicien, c'est avant tout un théoricien qui a travaillé sur divers aspects de la physique de la matière molle, puis de la physique pour la biologie.

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