Physique et Mécanique des Milieux Hétérogènes
UMR 7636

Fête de la science au PMMH !

Sylvain Patinet — 2026-09-07T16:23:00Z

Le PMMH sera présent à l'ESPCI (10 rue Vauquelin, 75005 Paris) et au village des sciences de Sorbonne Université (Jussieu, 75005 Paris) le samedi 10 octobre dans l'après-midi pour des démonstrations expérimentales en accès libre à destination du grand public.
Le laboratoire accueillera aussi des groupes scolaires le 6 et 7 octobre prochain.
La visite du laboratoire se découpera en ateliers permettant un rapide panorama des activités de recherche du PMMH : propagation de vagues, (…)

- Actualités / Accueil-actus

Experimental investigation of the second oscillatory bifurcation past a stationary sphere

Sylvain Patinet — 2026-07-16T16:10:54Z

We report experimental results on the low-frequency dynamics in the wake of a stationary sphere and the corresponding bifurcation. This low frequency is the second frequency appearing past a sphere when the Reynolds number is increased. We measure the velocity field using particle image velocimetry in transverse planes past a sphere placed in a water channel, and obtain the streamwise vorticity. We compute the position of the barycentre of the absolute value of the vorticity and projected (…)

- Dernières publications / Accueil-publis

Experimental investigation of the second oscillatory bifurcation past a stationary sphere

Sylvain Patinet — 2026-07-16T16:03:32Z

- Last publications / Accueil-publis

Collective motion in bacterial suspensions is scale-free

Sylvain Patinet — 2026-06-03T16:51:28Z

Nature abounds with highly performative collective behaviors, from bird flocks and fish schools to ant colonies and multicellular tissues. Comparable emergent dynamics arise in bacterial suspensions, where hydrodynamic interactions drive self-organization into turbulent flows. These flows are crucial for mixing nutrients essential to sustaining bacterial activity. Current theories offer conflicting predictions about the emergence of these flows and their characteristic scales. Here, (…)

- Dernières publications / Accueil-publis

Collective motion in bacterial suspensions is scale-free

Sylvain Patinet — 2026-06-03T16:50:01Z

- Last publications / Accueil-publis

A microfluidic band-pass filter for flexible fiber separation

Sylvain Patinet — 2026-02-17T07:01:05Z

Flexible fibers are common in nature and technology, from biological filaments to nanomaterials and pollutants. However, sorting these deformable, anisotropic objects in flow remains difficult. We show that microfluidic devices with tilted pillar arrays-originally designed for spherical particles-can be adapted to separate fibers by length. Unexpectedly, these arrays act as band-pass filters, causing lateral migration only for fibers whose lengths match the interpillar spacing. This (…)

- Dernières publications / Accueil-publis

A microfluidic band-pass filter for flexible fiber separation

Sylvain Patinet — 2026-02-17T06:57:07Z

- Last publications / Accueil-publis

Stages au PMMH

2025-10-21T11:07:14Z

Internships at PMMH

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Internships at PMMH

2025-10-21T10:57:25Z

Internships at PMMH

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Lifetime and fluctuations of specific bonds...

Sylvain Patinet — 2025-10-01T08:39:27Z

Lifetime and fluctuations of specific bonds between anisotropic colloids mediated through depletion interactions
To fabricate large-scale structures using colloidal particle self-assembly, one of the main challenges is to prevent kinetic trapping in metastable states. Therefore, interactions and colloids must be carefully chosen to ensure selectivity to guide the assembly, reversibility to enable large-scale reorganization and flexibility to finely tune colloid positioning. In pursuit of (…)

- Dernières publications / Accueil-publis

Physique et Mécanique des Milieux HétérogènesUMR 7636

Fête de la science au PMMH !

Experimental investigation of the second oscillatory bifurcation past a stationary sphere

Experimental investigation of the second oscillatory bifurcation past a stationary sphere

Collective motion in bacterial suspensions is scale-free

Collective motion in bacterial suspensions is scale-free

A microfluidic band-pass filter for flexible fiber separation

A microfluidic band-pass filter for flexible fiber separation

Stages au PMMH

Internships at PMMH

Lifetime and fluctuations of specific bonds...

Physique et Mécanique des Milieux Hétérogènes
UMR 7636