A5104635818- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Fluid Dynamics and Thin Films
- Astrophysics and Cosmic Phenomena
- Rheology and Fluid Dynamics Studies
- Adhesion, Friction, and Surface Interactions
- Atomic and Subatomic Physics Research
- Surface Modification and Superhydrophobicity
- Pickering emulsions and particle stabilization
- Fluid Dynamics and Heat Transfer
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- nanoparticles nucleation surface interactions
- Tribology and Lubrication Engineering
- Material Dynamics and Properties
- Force Microscopy Techniques and Applications
- Electrostatics and Colloid Interactions
- Fluid Dynamics and Mixing
- Surfactants and Colloidal Systems
University of Twente
2022-2025
Université Paris Sciences et Lettres
2017-2023
Centre National de la Recherche Scientifique
2003-2023
Université de Bordeaux
2020-2023
ESPCI Paris
2017-2023
Gulliver
2020-2023
Max Planck University of Twente Center for Complex Fluid Dynamics
2023
Délégation Paris 6
2021
Laboratoire Ondes et Matière d'Aquitaine
2020-2021
Aix-Marseille Université
1993-2020
The classical Cox–Voinov theory of contact line motion provides a relation between the macroscopically observable angle, and microscopic wetting angle as function contact-line velocity. Here, we investigate how viscoelasticity, specifically normal stress effect, modifies dynamics. Using thin film equation for second-order fluid, it is found that effect dominant at small scales yet can significantly affect macroscopic motion. We show be incorporated in through an apparent which differs from...
Earth’s magnetic field is generated by convective motions in its liquid metal core. In this fluid, the heat diffuses significantly more than momentum, and thus Prandtl number $Pr$ well below unity. The thermally driven flow dynamics of metals are very different from moderate- fluids, such as water those used current dynamo simulations. order to characterise rapidly rotating thermal convection low- we have performed laboratory experiments a cylinder aspect ratio $\unicode[STIX]{x1D6E4}=1.94$...
Abstract The dip-coating geometry, where a solid plate is withdrawn from or plunged into liquid pool, offers prototypical example of wetting flows involving contact-line motion. Such are commonly studied using the lubrication approximation approach which intrinsically limited to small interface slopes and thus contact angles. Flows for arbitrary angles, however, can be generalized theory that builds upon viscous corner flow solutions. Here we derive this viscoelastic liquids exhibit normal...
Abstract Lubrication flows between two solid surfaces can be found in a variety of biological and engineering settings. In many these systems, the lubricant exhibits viscoelastic properties, which modify associated lubrication forces. Here, we experimentally study by considering motion submerged cylinder sliding down an incline. We demonstrate that cylinders move faster when released Boger liquid compared to Newtonian with similar viscosity. Cylinders exhibit pure liquids, contrast stick-slip...
We present the first direct measurement of elastohydrodynamic lift force acting on a sphere moving within viscous liquid, near and along soft substrate under nanometric confinement. Using atomic microscopy, is probed as function gap size, for various driving velocities, viscosities, stiffnesses. The increases reduced shows saturation at small gap. results are in excellent agreement with scaling arguments quantitative model developed from lubrication theory, linear elasticity, compliances....
We investigate theoretically and numerically the impact of an elastic sphere on a rigid wall in viscous fluid. Our focus is dynamics contact, employing soft lubrication model which separated from by thin liquid film. In limit large inertia, bounces close to Hertz theory. Remarkably, film thickness separating exhibits non-trivial self-similar properties that vary during spreading retraction phases. Leveraging these properties, we establish energy budget predict coefficient restitution for...
The motion of an object within a viscous fluid and in the vicinity soft surface induces hydrodynamic stress field that deforms latter, thus modifying boundary conditions flow. This results elastohydrodynamic interactions experienced by particle. Here, we derive soft-lubrication model, order to compute all forces torque applied on rigid sphere is free translate rotate near elastic wall. We focus limit small deformations with respect fluid-gap thickness, perform perturbation analysis...
The unsteady hydrodynamic drag exerted on an oscillating sphere near a planar wall is addressed experimentally, theoretically and numerically. experiments are performed by using colloidal-probe atomic force microscopy in thermal noise mode. resonance frequencies quality factors extracted from the measurement of power spectrum density probe oscillation for broad range gap distances Womersley numbers. shift frequency colloidal as goes close to solid infers wall-induced variations effective...
We investigate experimentally the behavior of self-propelled water-in-oil droplets, confined in capillaries different square and circular cross-sections. The droplet's activity comes from formation swollen micelles at its interface. In straight velocity droplet decreases with increasing confinement. However very high confinement, converges toward a non-zero value, so that even long droplets swim. Stretched are then used to explore higher lubrication layer around takes non-uniform thickness...
We report contactless measurements of the viscoelastic rheological properties soft gels. The experiments are performed using a colloidal-probe Atomic Force Microscope (AFM) in liquid environment and dynamic mode. mechanical response is measured as function gap thickness for different oscillation frequencies. Our reveal an elastohydrodynamic (EHD) coupling between flow induced by probe deformation data quantitatively described lubrication model. frequency-dependent storage loss moduli...
The CP violation parameter η+− is determined through the eigentime-dependent asymmetry in rates of initially tagged K0 and decaying to π+π−. obtained values are |η+−| = (2.312 ± 0.043stat. 0.030syst. 0.011τs) × 10−3 Φ+− 42.7° 0.9stat.° 0.6syst.° 0.9Δm° with Δ (527.4 2.9) 107h̵gs−1 measured same experiment using semileptonic decay channel.
A thin liquid film with non-zero curvature at its free surface spontaneously flows to reach a flat configuration, process driven by Laplace pressure gradients and resisted the liquid's viscosity. Inspired recent progresses on dynamics of droplets soft substrates, we here study relaxation viscous supported an elastic foundation. Experiments involve polymer films elastomeric where liquid-air interface is monitored using atomic force microscopy. theoretical model that describes coupled...
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...
A solid plate withdrawn from a wetting liquid bath entrains thin film, process known as dip coating. We theoretically investigate the influence of soft layer coated on plate. The liquid-film thickness is found to be enhanced at low pulling velocity, when elastic deformations are larger than thickness. scaling relation film with velocity and modulus analytically characterized using an asymptotic-matching method, confirmed numerical integration.