Powders of nanoparticles are volatile, i.e. easily disperse in air, which makes their handling difficult. Granulation nanoparticle powders provides a solution to that issue, and it is generally performed by spray drying the have been suspended liquid. Spray colloidal suspension consists atomising into droplets fast flowing hot gas. Once dried, resulting dry grains/microparticles can be used wide range applications - food, pharmaceutics, fillers, ceramics, etc. It well known grains from...

We report on a new gut chip combining the co-culture of primary epithelial and stromal cells in 3D biomimetic scaffold. Proper segregation dividing differentiated along crypt-villus axis was achieved these unique conditions.

The spreading dynamics of a droplet pure liquid deposited on rigid, nonsoluble substrate has been extensively investigated. In purely hydrodynamic description, the contact line is determined by balance between energy associated with capillary driving force and dissipated viscous shear in liquid. This expressed Cox-Voinov law, which relates velocity to angle. More recently, complex situations have examined dissipation and/or may be strongly modified, leading sometimes spectacular changes...

We set micron size particles into macroscopic motion by submitting them to a low frequency electric field (of zero mean value) in microfabricated channel exhibiting topological ratchet-like local polarity. Rectification is induced the coupling between electrophoresis, electroosmosis, and dielectrophoresis. The velocities of are functions geometry channel; they strongly depend on their which opens way potential separations.

We report on the flows associated with capillary rise occurring when a glass sphere is put into contact film of drying polymer solution. A visco-capillary ripple observed to form at early times and propagate until it freezes. Its dynamics final position are in quantitative agreement those predicted frame lubrication theory, provided an effective time introduced, which accounts for increase viscosity decrease thickness film. At later times, secondary forms we show that its amplitude...

In binary mixtures, the lifetimes of surface bubbles can be five orders magnitude longer than those in pure liquids because slightly different compositions bulk and surfaces, leading to a thickness-dependent tension thin films. Taking advantage resulting simple rheology, we derive equations describing thickness, flow velocity single liquid film, using thermodynamics ideal solutions film mechanics. Numerical resolution shows that, after first step equilibration, Laplace-pressure-driven is...

We have experimentally applied some concepts of "force-free" motion to micron size particles (latex beads). The coupling dissipation and local spatial asymmetry the potential experienced by beads can put them into motion. potentials used in these experiments are dielectrophoretic nature. To that end, electrodes particular shapes were order submit considered suspensions inhomogeneous ac electric fields. Two regimes explored: i-the Brownian ratchet case which a particle is successively trapped...

It is shown theoretically and experimentally that a liquid droplet can move on surface structured with locally asymmetric pattern when breathing of the drop induced by external means. Two different situations be envisioned: whose volume modulated equilibrium contact angle switched between two extreme values. This last case was investigated using electric fields acting water droplets in castor oil. The main trends theory are verified although quantitative analysis would necessitate either...

We submit a suspension of Brownian latex spheres in water to spatially periodic and asymmetric potential successively switched on off. Such is created by dielectrophoretically induced forces resulting from the application high-frequency electric field between plane electrode blazed optical grating. As expected, we observe net macroscopic drift particles. Their average velocities have been measured as function time during which quantitative agreement with theoretical predictions. In...

We show that the control of interactions between colloidal particles determines shape dried millimeter sized suspension droplets, which can remain spherical or buckle.

The wetting dynamics of a solvent on soluble substrate interestingly results from the rates transfers into substrate. When supported film hydrosoluble polymer with thickness e is wet by spreading droplet water instantaneous velocity U, contact angle measured to be inversely proportionate product and velocity, eU, over two decades. As for many polymers, we used (a polysaccharide) has strongly nonlinear sorption isotherm φ(a(w)), where φ volume fraction in aw activity water. For first time,...

We have studied the flow induced by a macroscopic spherical particle settling in Laponite suspension that exhibits yield-stress, thixotropy and shear-thinning. show fluid (or aging) induces an increase with time of both apparent yield stress shear-thinning properties but also breaking fore-aft symmetry predicted Hershel-Bulkley fluids (yield-stress, no thixotropy). varied exerted particles on using different densities. Although stresses are same order magnitude, velocity field presents...

We study the wetting of polymer layers by polar solvents. As previously observed, when a droplet solvent spreads, both its contact angle and velocity decrease with time as result transfers from to substrate. show that, is initially glassy, decreases steeply for given value velocity, Ug. demonstrate that those variations plasticization, i.e., glass transition, undergone layer during spreading, owing increase content. By analyzing previous predictions on rigid soft viscoelastic substrates, we...

We report the first experimental observation of a commensurate twist-grain-boundary smectic- $A$ phase $({\mathrm{TGB}}_{A})$. The number blocks per pitch is found to vary with temperature but independent thickness well aligned sample. For time variations distance between screw dislocations ${l}_{d}$ and grain boundaries ${l}_{b}$ have been determined in ${\mathrm{TGB}}_{A}$ phase. ratio ${l}_{b}{/l}_{d}$ be very close one predicted by Renn Lubensky. also structural study presumed chiral...

We present an experimental study of the sedimentation non-Brownian monodisperse suspensions in polymeric shear-thinning fluids. In such media and contrary to what is observed Newtonian fluids, no front appears; particle aggregation moreover leads formation vertical particle-rich structures inhomogeneous volume fraction along cell height. Once these structure formed, a very efficient settling occurs whereas process further slows down at long times. show that temporal variations mean given...

We analyze the effects of polymer concentration, Cp, and physical crosslinking ratio, rc, on linear viscoelasticity lightly entangled, linear, associating polymers with multiple crosslinkable groups along chain backbone. To accomplish this goal, we utilize three novel tools: a robust tunable chemistry based electrophilic methacryl-succinimidyl modified poly(N-isopropylacrylamide); state-of-the-art entanglement theory, called discrete slip-link molecular model; experimental technique, surface...

We present a new non-invasive optical method to measure the linear viscoelastic properties of materials, ranging from complex fluids soft solids, within large frequency range (about 0.1–104 Hz). The surface fluctuation specular reflection (SFSR) technique is based on measurement thermal fluctuations free surfaces materials at which laser beam specularly reflected. propagation waves depends tension, density, and modulus G*(ω) material. SFSR signal results contribution different modes, we...