A5032269327- Electrostatics and Colloid Interactions
- Material Dynamics and Properties
- Microfluidic and Bio-sensing Technologies
- Fluid Dynamics and Turbulent Flows
- Radioactive contamination and transfer
- Hydrology and Sediment Transport Processes
- Combustion and Detonation Processes
- Disaster Response and Management
- Structural Response to Dynamic Loads
- Granular flow and fluidized beds
- Micro and Nano Robotics
- Particle Dynamics in Fluid Flows
- Rheology and Fluid Dynamics Studies
- nanoparticles nucleation surface interactions
- Nanopore and Nanochannel Transport Studies
- Pickering emulsions and particle stabilization
- Radiation Effects and Dosimetry
- Chemical Synthesis and Characterization
- Enhanced Oil Recovery Techniques
- Coastal and Marine Dynamics
- Fluid Dynamics and Thin Films
- Lattice Boltzmann Simulation Studies
- Plant Water Relations and Carbon Dynamics
- Geotechnical and Geomechanical Engineering
- Nuclear and radioactivity studies
Université Paris Sciences et Lettres
2021-2023
Centre National de la Recherche Scientifique
2020-2023
ESPCI Paris
2021-2023
Gulliver
2020-2023
École Normale Supérieure - PSL
2023
Institut Curie
2023
Chimie ParisTech
2023
Institut Pierre-Gilles de Gennes pour la Microfluidique
2020-2023
Physique et Mécanique des Milieux Hétérogènes
2022
Université Paris Cité
2022
We investigate the radial thermocapillary flow driven by a laser-heated microbead in partial wetting at water–air interface. Particular attention is paid to evolution of convective patterns surrounding hot sphere as latter increasingly heated. The morphology nearly axisymmetric low laser power (P). Increasing P leads symmetry breaking with onset counter-rotating vortex pairs. boundary condition interface, close no-slip low-P regime, turns about stress-free between pairs high-P regime. These...
We report the experimental observation of anisotropic diffusion polystyrene particles immersed in a lyotropic liquid crystal with two different anchoring conditions. Diffusion is shown to obey Stokes-Einstein law for particle diameters ranging from 190 nm up 2 micron. In case prolate micelles, beads diffuse four times faster along director than perpendicular directions. theory part we present perturbative approach Leslie-Ericksen equations and relate coefficients Miesovicz viscosity...
Nowadays more than two billion people own smartphones, without necessarily realizing they have a mobile physics lab that can be used to study acoustics, mechanics, astronomy, optics, fluids or even serves as an oscilloscope. All smartphones at least one camera, which is probably the most well-known and sensor of this device. It allows us take pictures, videos, scan QR codes, etc. In article, we show how simple ray optics with determine focal length smartphone could interesting interactive...
The dispersive spreading of microscopic particles in shear flows is influenced both by advection and thermal motion. At the nanoscale, interactions between such their confining boundaries become unavoidable. We address roles electrostatic repulsion absorption on spatial distribution dispersion charged nanoparticles near-surface flows, observed under evanescent illumination. lower surface tuned varying electrolyte concentrations. Particles leaving field vision can be neglected from further...
Spiroplasmas are bacteria that do not possess flagella and their motility is linked to kink propagation coupled changes in the cell body helicity. While of with flagellar motion has been studied extensively, less work devoted spiroplasmas. We first show such large variability from individual as well fluctuations time. The Brownian both orientation translation also highlighted. propose a simple model disentangle different components this by examining trajectories single viscosity solvents....
Velocity distributions in normal shock waves obtained dilute granular flows are studied. These cannot be described by a simple functional shape and believed to bimodal. Our results show that these not strictly bimodal but trimodal distribution is shown sufficient. The usual Mott-Smith description of distributions, developed for molecular gases, based on the coexistence two subpopulations (a supersonic subsonic population) front, can modified adding third subpopulation. experiments this...
In turbulent rough-walled flows, the 2D friction-roughness relation differs from its 3D counterpart.
Advection-diffusion coupling can enhance particle and solute dispersion by orders of magnitude as compared to pure diffusion, with a steady state being reached for confined flow regions such nanopore or blood vessel. Here, using evanescent wave microscopy, we measure the first time full dynamics Taylor dispersion, highlighting crucial role initial concentration profile. We make time-dependent, nanometrically-resolved measurements varying nanoparticle size, velocity gradient, viscosity in...
Using evanescent wave microscopy to study near-surface, semi-dilute polymer solution flows provides simultaneous access the mechanical behaviour of liquid and boundary condition at interfaces. Our results highlight importance electrostatic interactions between polymers bounding wall.
Des contaminations expérimentales d’espèces marines par des produits de fission ont été réalisées au Laboratoire Radioécologie marine, C.E.A., Département la Protection Sanitaire. Ces recherches destinées à apporter une contribution aux données permettant situer les niveaux maximaux admissibles rejets radioactifs en mer reposent sur notion « facteur concentration » exprimant capacité plus ou moins marquée organismes concentrer radioéléments provenances diverses présents dans le milieu marin.
The low value of the speed sound in dilute granular media permits study properties supersonic flows for a wide range Mach numbers. In this paper, we report experimental observation subsonic–supersonic transition vibrated gas. shock fronts studied are obtained by simply pushing rectangular obstacle into gas different velocities. regime is characterized formation normal waves whose width increases when number decreases to values close 1. bimodal model proposed Mott-Smith 1950s provides good...
Scalar image velocimetry (SIV) is the technique to extract velocity vectors from scalar field measurements. The usual involves minimising a cost functional, that penalises deviation conservation equation. This approach requires measured be sufficiently resolved and relatively noise free, such space time derivatives of can accurately evaluated. We quantify these requirements for synthetic two-dimensional (2-D) turbulent flow by evaluating reconstruction accuracy as function temporal spatial...
To aid in the recycling of ionic liquids, a method that takes advantage capillary phenomena at small scales is presented. The phase separation performed temperature gradient by joint effects sedimentation and thermocapillary actuation. This gives rise to complex three-dimensional flow structure, which quantitatively captured our model.
The flow of a submerged water jet directed toward the liquid interface is investigated both experimentally and theoretically. We find evidence that presence small amount surfactants can trigger an azimuthal instability. Our theoretical model reveals surfactant advection in Stokes regime contains minimal ingredients to explain
ABSTRACT Objectives Determine the sensitivity and specificity of a Point-Of-Care test (‘COVIDISC’) for SARS-COV2. The novelty is to integrate, on same (low-cost) compact plastic/paper device, solid phase RNA extraction RT-LAMP amplification, all reagents being freeze-dried it. Method Retrospective study with cohort 99 patients characterized by real-time RT-PCR. 37 positive naso-pharyngeal samples cover broad range viral loads (from 5 gc /µL 2 10 6 gc/ µL sample). Results COVIDISC found 36...
Des contaminations expérimentales de crevettes roses ont été réalisées par ingestion moules contaminées le cæsium 137. Une brusque augmentation la contamination est constatée après chaque repas, suivie d’une décontamination partielle. La résiduelle évaluée à 15 % environ l’activité nourriture et une comparaison établie entre l’importance due l’ingestion celle intervenant partir du milieu ambiant montre prépondérance cette dernière.
Les auteurs rendent compte d’expériences de contamination par le caesium 137 deux Mollusques Lamellibranches, l’un marin : Cardium edule (L), l’autre dul- cicole Anodonta cygnea (L).