Seminars

PMMH’s weekly seminar is held every Friday at 11 am (map)

Contact :
Laurent Duchemin
Sylvain Patinet
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
responsables-seminaires (arobase) pmmh.espci.fr

PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France

Tel : (33) 1 40 79 45 22


Séminaire PMMH - Thomas Salez (LOMA, Bordeaux)

Vendredi 9 février de 11h00 à 12h00 - Salle réunion PMMH 1

Brownian motion in confinement

Brownian motion near interfaces is a canonical situation, encountered from fundamental biophysics to nanoscale engineering. Using a combination of experimental, theoretical and numerical methods, we study the thermally-induced random tridimensional trajectories of individual microparticles, within salty aqueous solutions, in the vicinity of rigid walls, and in the presence of surface charges. We construct the time-dependent position and displacement probability density functions, and study the non-Gaussian character of the latter which is a direct signature of the hindered mobility near the wall. Furthermore, we implement a robust multifitting method, allowing for the thermal-noise-limited inference of diffusion coefficients spatially resolved at the nanoscale, equilibrium potentials, and forces at the femtonewton resolution. Finally, we discuss more complex situations, such as the ones involving soft boundaries, external flows or active microswimmers.

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Recent seminars  (8)

  • Séminaire PMMH - Jacques Fattaccioli (PASTEUR, ENS)
    Vendredi 15 mars de 11h00 à 12h00 - Salle réunion PMMH 1
    Bacteria on high fat diets cooperate to stay fit
    During the consumption of alkanes, Alcanivorax borkumensis, a bacteria commonly found in oil spill areas, form a biofilm around oil droplets to consume them. The role this plays during degradation remains unclear. Using in-situ microfluidic tracking, we identify a shift in biofilm morphology that depends on (...)
  • Séminaire PMMH - Min-Hui LI (Chimie ParisTech )
    Vendredi 8 mars de 11h00 à 12h00 - Salle réunion PMMH 1
    Electroactive Bi-functional Liquid Crystal Elastomer Actuators
    Liquid crystal elastomers (LCEs) show promising potentials as smart actuators, for example, those contracting/expanding linearly like mammalian muscles.[1] Direct heating and light illumination are the most used activation mode in LCE actuators because LCEs are based on thermotropic or phototropic liquid (...)
  • Séminaire PMMH - Bérengère Abou (MSC, Univ. Paris Cité)
    Vendredi 1er mars de 11h00 à 12h00 - Salle réunion PMMH 1
    Intracellular rheology of red blood cells
    The characterisation of erythrocyte stiffness and its heterogeneity in a blood sample is a key parameter for the description of erythrocyte pathologies. I will present a method for investigating the intracellular rheology of red blood cells and the heterogeneity of the population using molecular rotors. These are (...)
  • Séminaire PMMH - Jon Otto Fossum (Dept of Physics , NTNU, Trondheim, Norway)
    Vendredi 16 février de 11h00 à 12h00 - Salle réunion PMMH 1
    Clay minerals as 2D natural nanomaterials for sustainable applications
    Clay minerals are among the most abundant and sustainable on earth, and due to this and their low-cost they are found in many traditional applications that exploit their physical and chemical properties, including their mechanical stability, their non-toxicity and in effect their underlying 2D nanoscale character. (...)
  • Séminaire PMMH - Sophie Marbach (Phenix, Sorbonne Université)
    Vendredi 2 février de 11h00 à 12h00 - Salle réunion PMMH 1
    The Countoscope : Measuring Dynamics by Counting Particles in Boxes
    Any imaging technique is limited by its field of view. As objects or particles move in and out of the observation field, tracking their motion, especially over long periods, becomes challenging. In addition, available analysis techniques face challenges reconstructing trajectories in dense and heterogeneous (...)
  • Séminaire PMMH - Sylvain Lefebvre (INRIA Nancy)
    Vendredi 26 janvier de 11h00 à 12h00 - Salle réunion PMMH 1
    Controlling the appearance and deformation of 3D printed objects.
    This seminar will focus on how to design shapes and plates that exhibit specific behaviors thanks to a precise control of their fabrication process. Specifically, by orienting the deposition trajectories of a fused filament 3D printer, we introduce anisotropies that impact the observed properties of the final (...)
  • Séminaire PMMH, Joshua Dijksman (UVA)
    Vendredi 19 janvier de 11h00 à 12h00 - Salle réunion PMMH 1
    Covalent adaptable polymer networks provide mechanical tunability via molecular and mesoscopic lengthscales
    Polymeric materials are ubiquitous in society but also present a large source of waste. There is an ongoing search for polymeric materials that can be better tuned and recycled. One class of polymers that came into the spotlight for this purpose are so-called covalent adaptable polymer networks. Such polymer (...)
  • Séminaire PMMH, Joshua Dijksman (UVA)
    Vendredi 19 janvier de 11h00 à 12h00 - Salle réunion PMMH 1
    Covalent adaptable polymer networks provide mechanical tunability via molecular and mesoscopic lengthscales
    Polymeric materials are ubiquitous in society but also present a large source of waste. There is an ongoing search for polymeric materials that can be better tuned and recycled. One class of polymers that came into the spotlight for this purpose are so-called covalent adaptable polymer networks. Such polymer (...)
Information for the speakers

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.

Link to cofee seminar (internal, every Thursday)


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Practical information

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