Séminaires PMMH

Séminaire PMMH - Site Jussieu

Séminaires café

Contact :
Benoit Semin
Sylvain Patinet
Etienne Reyssat
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

Comment venir ?

7 quai Saint Bernard, 75005 PARIS

Le séminaire hebdomadaire du laboratoire PMMH a lieu tous les vendredis à 11h, au premier étage Barre Cassan, campus Jussieu.


Séminaire PMMH, Vinod Kumar Saranathan (Yale NUS College)

Vendredi 6 décembre 11:00-12:00 - Salle réunion PMMH 1

Biomimetic and Bio-inspired Potential of Self-assembled Biophotonic Nanostructures

Colors in Nature can be produced either chemically, by the selective light bsorption by pigments, or physically, by light interference from biophotonic nanostructures. Intriguingly, there are almost no known violet, blue or green pigments in animals. And yet these structurally produced colors are ubiquitous in nature and constitute an important aspect of the overall appearance of organisms, as they are frequently used in camouflage, and in social and sexual communication. As the underlying biophotonic nanostructures are overwhelmingly diverse in form and function, their structural and optical characterization has hitherto remained challenging despite centuries of research, which is where I have made rapid and significant ontributions. Although there is a burgeoning interest on structural colors from biologists, physicists and engineers, we currently lack an explicit comparative framework, which is essential to understand how these biological signals function, and evolve in organisms. Moreover, the mechanisms controlling the morphogenesis of these complex, biologically patterned nanostructures are much too large to be described by conventional cell or molecular biology, and much too small to be captured by traditional developmental biology. As a consequence, we know very little about the development of photonic nanostructures within cells, beyond the realisation that they are self-assembled intra-cellularly by mechanobiological, phase separation and micro-phase separation like processes. Biophotonic nanostructures are also of broader interest to materials science and engineering, since the facile synthetic abrication of three-dimensional photonic nanostructures at these rather large ptical length scales (200-500 nm) is challenging. Organismal structural colors that have evolved over millions of years to function in a variety of signalling contexts are an ideal source to look for naturally optimized solutions to technological roblems in sensing, photonics, etc. In this talk, I will summarise our current nowledge about the structure, function and morphogenesis of biophotonic nanostructures and how this can be leveraged for the biomimetic or bio-inspired synthesis of next generation photonic meta-materials and devices.

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Séminaires  (3)

  • Séminaire PMMH - Jean-Philippe Bouchaud
    Vendredi 20 décembre 11:00-12:00 - Salle réunion PMMH 1
    Crises et phénomènes socio-économiques collectifs
    Comme l'écrivait P. W. Anderson en 1972 dans « More is different », le comportement de grandes assemblées d'individus ne peut pas être compris à partir de l'extrapolation du comportement d'individus isolés. Au contraire, des comportements complètement nouveaux, parfois spectaculaires et difficiles à anticiper, peuvent (...)
  • Séminaire PMMH- Elisabeth Guazzelli (MSC)
    Vendredi 7 février 2020 11:00-12:00 - Salle réunion PMMH 1
    Particle motion in vortical flows
    In many natural phenomena or industrial applications, heavy particles are transported in complex flows. The flow structures may happen to promote the stirring and dispersion of the particles. But the opposite can also take place and the flow configuration may contribute to the focussing and accumulation of (...)
  • Séminaire PMMH - Sergei Nechaev (Center Poncelet, CNRS UMI 2615)
    Vendredi 3 avril 2020 11:00-12:00 - Salle réunion PMMH 1
    Anomalous statistics of extreme random processes
    I am going to discuss two problems of extreme statistics in which unusual (but related to each other) features arise : i) statistics of two-dimensional "stretched" random walks over a semicircle with Kardar-Parisi-Zhang (KPZ) scaling, ii) spectral properties of symmetric three-diagonal random matrices (operators) (...)

Instructions générales pour les conférenciers

Le public du séminaire est très hétérogène (rien qu’au PMMH nous travaillons sur des thématiques très diverses, mécanique des fluides, des milieux granulaires, des solides, physique statistique, physique du mouillage, micro-fluidique, biophysique,...) l’objectif est donc de ne pas faire un séminaire trop spécialiste : au moins la première moitié du séminaire à un niveau accessible pour celui qui ne connaît rien sur le sujet.

Le séminaire a lieu à 11h. rendez-vous 15 minutes avant pour installer et tester la projection.

Le séminaire dure environ 45 minutes pour laisser un peu de temps pour discuter à la fin.

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Informations Pratiques

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

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