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Home > Research > Talks & Conferences > Talks Given at LIPhy

Invited Talks

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These talks are given by invited speakers at LIPhy. The intended audience is the whole LIPhy. A large general introduction intended for non-specialist is usually provided.

Typical talk duration is around one hour and includes about 15 mn of questions. The talks are scheduled usually every monday at 2PM. The place is at the conference room, second floor. Access to the lab can be obtained through the secretaries.

Agenda

  • Monday 18 November 14:00-15:30 - Matvey Morozov - Nonlinear Physical Chemistry Unit, Université Libre de Bruxelles

    Nonlinear Dynamics of Chemically Active Microdrops Grants an Insight into Interfacial Chemistry

    Résumé : A chemically active microdrop that is suspended in the bulk of a reagent solution is an example of a non-equilibrium physicochemical system akin to cells and vesicles. Owing to their non-equilibrium nature, active drops may excite the flow in the surrounding fluid even in the absence of preexisting asymmetries, such as gravity or inhomogeneous interfacial properties. In experiments, this spontaneous flow excitation results in active drops self-deforming or self-propelling along a straight, helical, or chaotic trajectory.
    In this talk, we will discuss two theoretical models that explain self-propulsion regime selection based on droplets’ interfacial properties. The first model corresponds to the case of a slow chemical reaction and demonstrates that in active drops of nematic liquid crystal, coupling of the flow field and liquid crystal configuration may result in a novel mode of orientational instability. Numerical solution of the model equations in 3D reveals that this instability leads to helical self-propulsion trajectory. The second model focuses on the case of intense chemical reaction. We consider a drop undergoing micellar dissolution and demonstrate that continuous assembly of swollen micelles may act as a cleaning mechanism for the droplet interface, thus significantly affecting the onset of self-propulsion. Moreover, as the kinetics of micelles production is inherently nonlinear, drop self-propelling behavior depends heavily on the sorption and reaction rates.



    contact: Salima Rafaï

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Monday 25 November 14:00-15:30 - Pierre-Antoine Bouttier

    LIPHY Seminar

    Résumé :



    contact: Philippe Beys

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Monday 16 December 14:00-15:30 - Guillaume Parry - SIMAP, Grenoble-INP/UGA/CNRS

    LIPHY Seminar

    Résumé :



    contact: Jocelyn Etienne

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Monday 6 January 2020 14:00-15:30 - Sophie Marbach

    LIPHY Seminar

    Résumé :



    contact: Cyril Picard

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Monday 27 January 2020 14:00-15:30 - Antoine SELLIER

    LIPHY Seminar

    Résumé :



    contact: Chaouqi Misbah

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


  • Monday 17 February 2020 14:00-15:30 - Knut Drescher - MPI Marburg

    LIPHY Seminar

    Résumé :



    contact: Jocelyn Etienne

    Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères


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