Jacques Leng
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View article: Carbopol gels as model fluids: influence of the grade
Carbopol gels as model fluids: influence of the grade Open
Carbopol dispersions are widely used in the literature as model yield stress fluids, particularly for studying complex macroscopic flows. The prevailing assumption is that they behave as standard elastoviscoplastic materials, facilitating…
View article: Collagen-Based Gut-on-Chip for <i>in vitro</i> modeling of intestinal barrier function and host-pathogen interactions
Collagen-Based Gut-on-Chip for <i>in vitro</i> modeling of intestinal barrier function and host-pathogen interactions Open
The human intestine, characterized by its villi and crypt structures, plays a critical role in nutrient absorption, barrier function, and host defense. However, traditional in-vitro models employing synthetic membranes like polydimethylsil…
View article: Silver Nanoshells with Optimized Infrared Optical Response: Synthesis for Thin-Shell Formation, and Optical/Thermal Properties after Embedding in Polymeric Films
Silver Nanoshells with Optimized Infrared Optical Response: Synthesis for Thin-Shell Formation, and Optical/Thermal Properties after Embedding in Polymeric Films Open
We describe a new approach to making ultrathin Ag nanoshells with a higher level of extinction in the infrared than in the visible. The combination of near-infrared active ultrathin nanoshells with their isotropic optical properties is of …
View article: Microfluidic Device for Monitoring Catalytic Events on Armored Bubbles
Microfluidic Device for Monitoring Catalytic Events on Armored Bubbles Open
A polydimethylsiloxane‐based microfluidic device allows monitoring local oxidation events in organic solvents at the level of an individual air bubble armored with surface‐active low‐surface energy catalytic particles. This new technique p…
View article: Microfluidic Device for Monitoring Catalytic Events on Armored Bubbles
Microfluidic Device for Monitoring Catalytic Events on Armored Bubbles Open
International audience
View article: Microfluidic Evaporation, Pervaporation, and Osmosis: From Passive Pumping to Solute Concentration
Microfluidic Evaporation, Pervaporation, and Osmosis: From Passive Pumping to Solute Concentration Open
Evaporation, pervaporation, and forward osmosis are processes leading to a mass transfer of solvent across an interface: gas/liquid for evaporation and solid/liquid (membrane) for pervaporation and osmosis. This Review provides comprehensi…
View article: Dense Phases of γ-Gliadins in Confined Geometries
Dense Phases of γ-Gliadins in Confined Geometries Open
The binary phase diagram of γ-gliadin, a wheat storage protein, in water was explored thanks to the microevaporator, an original PDMS microfluidic device. This protein, usually qualified as insoluble in aqueous environments, displayed a pa…
View article: Acoustic properties of emulsions with locally resonant scatterers
Acoustic properties of emulsions with locally resonant scatterers Open
We present the results of ultrasonic pulse propagation experiments on dilute emulsions of resonant scatterers. Thanks to microfluidics, we achieved highly monodisperse oil-droplet dispersions embedded in a Bingham fluid. Underwater measure…
View article: Swelling kinetics of a compressed lamellar phase
Swelling kinetics of a compressed lamellar phase Open
We investigate how multilamellar vesicles prepared in a compressed state under flow return to equilibrium. The kinetics is studied by following the temporal evolution of the viscoelasticity after the shear is stopped. It exhibits a two-ste…
View article: Anomalous elasticity of an ordered lamellar liquid foam
Anomalous elasticity of an ordered lamellar liquid foam Open
We investigate experimentally the linear viscoelastic properties of a lamellar liquid foam as a function of the cell size and spatial organisation. The system consists of multilamellar vesicles generated by a simple shear flow on a lyotrop…
View article: Multiphase Microreactors Based on Liquid–Liquid and Gas–Liquid Dispersions Stabilized by Colloidal Catalytic Particles
Multiphase Microreactors Based on Liquid–Liquid and Gas–Liquid Dispersions Stabilized by Colloidal Catalytic Particles Open
Pickering emulsions, foams, bubbles, and marbles are dispersions of two immiscible liquids or of a liquid and a gas stabilized by surface‐active colloidal particles. These systems can be used for engineering liquid–liquid–solid and gas–liq…
View article: Easy-to-Use Osmosis-Based Microfluidic Chip for Protein Crystallization: Application to a Monoclonal Antibody
Easy-to-Use Osmosis-Based Microfluidic Chip for Protein Crystallization: Application to a Monoclonal Antibody Open
International audience
View article: Measurement of the ultrasonic diffusion coefficient in a resonant multiple scattering suspension
Measurement of the ultrasonic diffusion coefficient in a resonant multiple scattering suspension Open
We report on frequency-resolved experimental measurements of the ultrasonic diffusivity in the MHz range. By means of robotics, we produced a highly monodisperse suspension made of soft metallic micro-beads randomly-dispersed in a water-ba…
View article: A Sacrificial Route for Soft Porous Polymers Synthesized via Frontal Photo-Polymerization
A Sacrificial Route for Soft Porous Polymers Synthesized via Frontal Photo-Polymerization Open
Within the very large range of porous polymers and a related immense scope of applications, we investigate here a specific route to design soft porous polymers with controlled porosity: we use aqueous-based formulations of oligomers with m…
View article: Energy velocity of multiply scattered waves in strongly scattering media
Energy velocity of multiply scattered waves in strongly scattering media Open
International audience
View article: Thin Coatings of Cerium Oxide Nanoparticles with Anti-Reflective Properties
Thin Coatings of Cerium Oxide Nanoparticles with Anti-Reflective Properties Open
Cerium oxide, in addition to its catalytic properties, is also known for its optical properties such as ultraviolet (UV) radiation filtering and a relatively high refractive index ( n > 2 ), which makes it an excellent candidate for multif…
View article: Optical Enantioseparation of Racemic Emulsions of Chiral Microparticles
Optical Enantioseparation of Racemic Emulsions of Chiral Microparticles Open
We report on the experimental demonstration of chirality-selective mechanical separation of randomly distributed assemblies of right-handed and left-handed chiral microparticles by optical means. Chiral-resolution experiments are made usin…
View article: A Soft 3D Acoustic Metafluid with Dual‐Band Negative Refractive Index
A Soft 3D Acoustic Metafluid with Dual‐Band Negative Refractive Index Open
Adv. Mater. 2016, 28, 1760 In the original manuscript, it was mentioned that the “the sound celerity scales as with K an elastic modulus and ρ the density”. More precisely, the sound celerity is exactly where K and G are the bulk and shear…
View article: Hierarchical self-assembly of nanoparticles for optical metamaterials
Hierarchical self-assembly of nanoparticles for optical metamaterials Open
Hierarchical self-assembly arranges nanostructures at different length scales. It gradually becomes an effective method of fabricating artificial metamaterials from composite nanostructures tailored for a particular response. Hierarchical …
View article: Hierarchical self-assembly of a bulk metamaterial enables isotropic magnetic permeability at optical frequencies
Hierarchical self-assembly of a bulk metamaterial enables isotropic magnetic permeability at optical frequencies Open
Raspberry-like magnetic nanoclusters are synthesized and self-assembled to form a bulk magnetic metamaterial.
View article: Microfluidic co-culture system model to study the interplay between sensory neurons and mesenchymal stem cells: new clues towards osteogenesis
Microfluidic co-culture system model to study the interplay between sensory neurons and mesenchymal stem cells: new clues towards osteogenesis Open
Event Abstract Back to Event Microfluidic co-culture system model to study the interplay between sensory neurons and mesenchymal stem cells: new clues towards osteogenesis Hugo Oliveira1*, Bruno P. Dos Santos1*, Diana I. Silva1*, Jacques L…