A5017597447- Microfluidic and Capillary Electrophoresis Applications
- Microfluidic and Bio-sensing Technologies
- Nanopore and Nanochannel Transport Studies
- Surface Modification and Superhydrophobicity
- Electrohydrodynamics and Fluid Dynamics
- Innovative Microfluidic and Catalytic Techniques Innovation
- Lattice Boltzmann Simulation Studies
- Lipid Membrane Structure and Behavior
- Fluid Dynamics and Thin Films
- Cellular Mechanics and Interactions
- Building materials and conservation
- Enhanced Oil Recovery Techniques
- Nanofabrication and Lithography Techniques
- Supramolecular Self-Assembly in Materials
- Adhesion, Friction, and Surface Interactions
- Pickering emulsions and particle stabilization
- Crystallization and Solubility Studies
- Electrowetting and Microfluidic Technologies
- 3D Printing in Biomedical Research
- Hydrogels: synthesis, properties, applications
- Force Microscopy Techniques and Applications
- Membrane Separation Technologies
- Advanced Polymer Synthesis and Characterization
- Marine Invertebrate Physiology and Ecology
- Cultural Heritage Materials Analysis
Centre National de la Recherche Scientifique
2010-2024
Laboratoire d'Analyse et d'Architecture des Systèmes
2015-2024
Université de Toulouse
2012-2024
Karunya University
2024
Roche (France)
2010-2023
Institut National Polytechnique de Toulouse
2023
Université Toulouse III - Paul Sabatier
2012-2023
University of Southampton
2002-2015
IFP Énergies nouvelles
2007-2011
Université Claude Bernard Lyon 1
2006-2010
We present in this Letter an experimental characterization of liquid flow slippage over superhydrophobic surfaces made carbon nanotube forests, incorporated microchannels. make use a particle image velocimetry technique to achieve the submicrometric resolution on profile necessary for accurate measurement surface hydrodynamic properties. demonstrate boundary Cassie state, associated with slip lengths few microns, while vanishing length is found Wenzel state when impregnates surface. Varying...
We investigate the hydrodynamic friction properties of superhydrophobic surfaces and quantify their superlubricating potential. On such surfaces, contact liquid with solid roughness is minimal, while most interface a liquid-gas one, resulting in strongly reduced friction. obtain scaling laws for effective slip length at surface terms generic characteristics (roughness scale, depth, fraction interface, etc.). These predictions are successfully compared to numerical results various geometries...
This paper provides an experimental investigation into the use of leading edge (LE) serrations as a means reducing broadband noise generated due to interaction between aerofoil’s LE and impinging turbulence. Experiments are performed on flat plate in open jet wind tunnel. Grids used generate isotropic homogeneous The form sinusoidal profiles wavelengths, λ, amplitudes, 2h. frequency amplitude characteristics studied detail order understand effect reduction compared with straight baseline...
We perform gas flow experiments in a shallow microchannel, 1.14±0.02 μm deep, 200 wide, etched glass and covered by an atomically flat silicon wafer. The dimensions of the channel are accurately measured using profilometry, optical microscopy interferometric microscopy. Flow-rate pressure drop measurements performed for helium nitrogen, range averaged Knudsen numbers extending up to 0.8 0.6 nitrogen. This represents extension, factor 3 or so, previous studies. emphasize importance number...
We measure velocity profiles in water flowing through thin microchannels, using particle image velocimetry combined with a nanopositioning system. From the profiles, we determine slip lengths two cases: Smooth hydrophilic glass surfaces, and smooth hydrophobic grafted monolayer of silane. The length is determined within $(\ifmmode\pm\else\textpm\fi{}100\phantom{\rule{0.3em}{0ex}}\mathrm{nm})$, i.e., five times more accurately than previous work. In all cases, find that below...
Osmosis across membranes is intrinsically associated with the concept of semipermeability. Here, however, we demonstrate that osmotic flow can be generated by solute gradients nonselective, fully permeable nanochannels. Using a fluorescence imaging technique, are able to measure water rate inside single nanochannels an unprecedented sensitivity femtoliters per minute rates. Our results indicate onset convective liquid motion under salinity gradients, from higher lower electrolyte...
The ability to self-assemble was evaluated for a large variety of amphiphilic block copolymers, including poly(ethyleneoxide-b-ε-caprolactone), poly(ethyleneoxide-b-d,l-lactide), poly(ethyleneoxide-b-styrene), poly(ethyleneoxide-b-butadiene) and poly(ethyleneoxide-b-methylmethacrylate). Different methods formation are discussed, such as cosolvent addition, film hydration or electroformation. influence experimental parameters macromolecular structures on the size morphology final...
We image the flow of complex fluids in microchannels controlled geometry using tracers. The spatial resolution allows us to access quantitatively bulk nonlinear rheology and wall slip, as we show on model polymer solutions. In perspective this strategy should prove useful for study heterogeneous flows more fluids.
We investigated the interactions between liquid, gas, and solid phases in capillary filling process of closed-end nanochannels. This paper presents theoretical models without with absorption diffusion gas molecules liquid. Capillary experiments were carried out silicon nanochannels different lengths. The measured characteristics length versus time are compared. results show that consists two stages. first stage resembles an open-end nanochannel. However, a remarkable discrepancy experimental...
Micropipette aspiration (MPA) is one of the gold standards for quantifying biological samples' mechanical properties, which are crucial from cell membrane scale to multicellular tissue. However, relying on manipulation individual home-made glass pipettes, MPA suffers low throughput and no automation. Here, we introduce sliding insert micropipette method, permits parallelization automation, thanks insertion tubular obtained by photolithography, within microfluidic channels. We show its...
DNA size separation followed by purification and enrichment constitute essential operations for genetic engineering.
The control of water flow in Electrostatic Double Layers (EDL) close to charged surfaces solution is an important issue with the emergence nanofluidic devices. We compare here zeta potential governing electrokinetic transport properties surfaces, electrostatic directly measured from their interaction forces. show that on smooth hydrophilic silica these quantities are similar, whereas OTS-silanized hydrophobic significantly higher, leading enhanced electro-osmotic velocity. enhancement...
Control and understanding of flows inside fabricated nanochannels is rich in potential applications, but nanoscale physics fluids remains to be clarified even for the simple case spontaneous capillary filling. This paper reports an experimental modelling investigation role gas on filling kinetics slowdown nanoslits (depth going from 20 nm 400 nm) compared Washburn's prediction. First, through usually observed trapped bubbles during a analysed thanks experiments realized with water, ethanol...
In this work, we demonstrated that the hydrogel obtained from a very simple and single synthetic molecule, N-heptyl-galactonamide was suitable scaffold for growth of neuronal cells in 3D. We evidenced by confocal microscopy presence into gel up to depth around 200 μm, demonstrating latter permissive cell enabled true 3D colonization organization. It also supported successfully differentiation adult human stem (hNSCs) both glial development really dense neurofilament network. So appears be...
The stress generation on pore walls due to the growth of a sodium chloride crystal in confined aqueous solution is studied from evaporation experiments microfluidic channels conjunction with numerical computations growth. study indicates that build-up as result highly transient process taking place over very short period time (in less than 1s our experiments). analysis makes clear what matters for not maximum supersaturation at onset but interface between and when latter about be walls. It...
Evaporation is a key phenomenon in the natural environment and many technological systems involving capillary structures. Understanding evaporation front dynamics enables rate from microfluidic devices porous media to be finely controlled. Of particular interest ability control position of through suitable design structure. Here, we show how model structures so as drying kinetics. This achieved by acting on spatial organization constrictions that influence invasion structure gas phase. Two...
A molecular gel self-assembled by wet spinning forms ultra-hydrated continuous filaments and reveals the solvent's radial diffusion phenomena.
We push the limits of hydrodynamic filtration by demonstrating filter-less sorting submicron particles, in line with model and simulations.
The objective of the present work is to study drying a quasi-two-dimensional model porous medium, hereafter called micromodel, initially filled with pure liquid. micromodel consists cylinders measuring $50~\unicode[STIX]{x03BC}\text{m}$ in both height and diameter, radially arranged as set neighbouring spirals sandwiched between two horizontal flat plates. As proceeds, air invades pore space elongated liquid films trapped by capillary forces form along spirals. These consist ‘chains’ bridges...
Blockage of pores by particles is found in many processes, including filtration and oil extraction. We present experiments through a linear array ten channels with one dimension which sub-micron, dilute dispersion Brownian polystyrene spheres flows under the action fixed pressure drop. The growth rate clog formed at pore entrance systematically increases number already saturated (entirely clogged) pores, indicating that there an interaction or "cross-talk" between pores. This observation...