We investigate the spreading of falling ambient-temperature Newtonian drops after their normal impact on a quartz plate covered with thin layer liquid nitrogen. As drop expands, nitrogen evaporates, generating vapour film that maintains in levitation. Consequently, latter spreads inverse Leidenfrost conditions. Three drop-spreading regimes are observed: (i) inertio-capillary, (ii) inertio-viscous, and (iii) inertio-viscous-capillary. In first regime, although expansion is essentially driven...

The equilibrium surface coverage and thickness of the grafted layer are predicted as functions molecular weight chains, solution concentration energy gained by adsorbing terminal group. It is shown that there two successive gimes in kinetics adsorption. characteristic construction time depends exponentially on chemical affinity end group surface. desorption a brush put contact with pure solvent also calculated

We study the phase behavior of a nonionic ternary surfactant system to which we add small amounts an ionic surfactant. At sufficiently high cosurfactant ratio, find at moderate concentration in amphiphiles non-birefringent having very elastic rheological properties analogous those previously reported by Hoffmann et al. (Langmuir 1994, 10, 3972) for similar systems. Our neutron scattering agrees with onion structure found these authors this remarkable phase. In addition, also studied fluid...

We show that a large class of viscoelastic fluids, i.e., transient networks, are brittle according to the Griffith's theory solid fracture. However, contrary solids, cracks intrinsic material arising from equilibrium nature fluid microstructure. The brittleness these fluids comes thermal fluctuations bonds distribution. In this approach, rupture stress is predicted be on order Young modulus, in very good agreement with experimental values.

In this article, we report on a theoretical investigation of the bending elasticity fluid bilayers consisting two amphiphilic species. According to ideas Safran et al. [Phys. Rev. A 43, 1071 (1991)], one expects that corresponding composition degree freedom couples curvature playing so significant role in properties mixed membrane. We show these can be interpreted terms moduli individual constituting monolayers provided are calculated at fixed chemical potential μ and not composition. simple...

We study the destabilization mechanism of thin liquid sheets expanding in air and show that dilute oil-in-water emulsion-based disintegrate through nucleation growth holes perforate sheet. The velocity thickness fields sheet outside are not perturbed by holes, hole opening follows Taylor-Culick law. find a prehole, which widens thins out with time, systematically precedes nucleation. dynamics prehole law theoretically predicted for spreading on another higher surface tension due to Marangoni...

We present an innovative template-free water-based sol-gel method to produce uniform mesoporous silica beads of millimeter size, which have tunable stiffness and porosity, could be used for adsorption applications. Our protocol exploits in-situ enzymatic reaction spherical hydrogel from a charge-stabilized suspension nanoparticles confined in millimetric drop suspended non-miscible oil. Once the gelation step is complete, bead gel cleaned oil deposited onto hydrophobic surface let dry....

Large water soluble macromolecules can be confined in all proportions into an electrostatically stabilized surfactant lamellar phase without change of the bilayer thickness. Upon progressive addition salt, sample separates a polymer-rich and surfactant-rich phase. Indeed, at some particular salt concentration, intermembrane repulsive interaction is no longer sufficient to maintain polymer coils squeezed structure. The separation generally first order. But we could find situation where it...

The thermodynamics and structural behavior of a new type transient network are reported. is obtained by adding in solution entangled surfactant wormlike micelles telechelic triblock copolymer whose hydrophobic ends anchor into the hydrophilic tails swollen aqueous solvent reversibly link cylindrical micelles. For comparison, we have also studied same system decorated with an amphiphilic diblock which corresponds exactly to cut two identical copolymers. We find that addition polymers induces...

During pendant drop experiments, a model physical gel made from oil in water microemulsion droplets reversibly linked together by triblock copolymers, exhibit very peculiar filament rupture corresponding to highly brittle failure of viscoelastic fluid. The fracture propagation has been tracked high speed videomicroscopy. Analysis the time evolution profile shows that is purely elastic and reversible without any significant bulk interfacial viscous dissipation. However, since moduli such...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface micelles formation by adsorption of block copolymersChristian LigoureCite this: Macromolecules 1991, 24, 10, 2968–2972Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 1991https://pubs.acs.org/doi/10.1021/ma00010a051https://doi.org/10.1021/ma00010a051research-articleACS PublicationsRequest reuse permissionsArticle Views267Altmetric-Citations49LEARN ABOUT THESE METRICSArticle Views are the...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Kaori Nakaya–Yaegashi, Laurence Ramos, Hervé Tabuteau, Christian Ligoure; Linear viscoelasticity of entangled wormlike micelles bridged by telechelic polymers: An experimental model for a double transient network. Journal Rheology 1 March 2008; 52 (2): 359–377. https://doi.org/10.1122/1.2828645 Download...

Abstract The collision of a liquid drop against small target results in the formation thin sheet that extends radially until it reaches maximum diameter. subsequent retraction is due to air–liquid surface tension. We have used time- and space-resolved technique measure thickness field this class sheet, based on grey-level measurement image dyed recorded using high-speed camera. This method enables precise range $10{-}450~{\rm\mu}\text{m}$ , with temporal resolution equal measured evolution...

We investigate freely expanding sheets formed by ultrasoft gel beads, and liquid viscoelastic drops, produced the impact of bead or drop on a silicon wafer covered with thin layer nitrogen that suppresses viscous dissipation thanks to an inverse Leidenfrost effect. Our experiments show unified behavior for dynamics holds solids, liquids, fluids we rationalize properly taking into account elastocapillary effects. In this framework, classical solids as far is negligible, appears asymptotic...

We report on a new class of self-assembled transient networks made surfactant micelles tunable morphology (from spheres, to rodlike wormlike) reversibly linked by telechelic polymers. Linear rheological measurements show that three distinct domains can be defined depending the morphologies micelles: domain where are isolated and not entangled, an intermediate partially entangled fully entangled. Flow curves suggest one associate failures modes: brittle mode, mode finally ductile/shear...

Agricultural spraying involves atomizing a liquid stream through hydraulic nozzle, thus forming sheet that is subsequently destabilized into drops. Standard adjuvants such as dilute oil-in-water emulsions are known to influence the spray drop size distribution. Although being documented, physical mechanisms at origin of increase remain unclear. To elucidate causing changes on distribution, we investigate destabilization sheets. Model laboratory experiments based collision tear small solid...

We study the effect of an amphiphilic block copolymer on thermodynamic properties a lyotropic lamellar phase into which it is incorporated. A quantitative analysis small angle neutron scattering spectra these samples shows that polymer strongly enhances stabilizing Helfrich's interactions between membranes, by increasing effective bilayer thickness. The smectic compressibility becomes insensitive to addition salt, as soon Debye length smaller than thickness layer adsorbed onto membrane. This...

We study experimentally and theoretically the sedimentation of gels made strongly aggregated colloidal particles, focussing on long time behavior, when mechanical equilibrium is asymptotically reached. The asymptotic gel height found to vary linearly with initial height, a finding in stark contrast recent similar [Manley \textit{et al.} 2005 \textit{Phys. Rev. Lett.} \textbf{94} 218302]. show that compaction results from balance between gravity pull, network elasticity, solid friction...

We investigate the effect of incorporation a neutral water-soluble nonadsorbing polymer polyvinylpyrrolidone (PVP) on bilayer bending moduli \ensuremath{\kappa} and $\overline{\ensuremath{\kappa}}$ lamellar phase ${L}_{\ensuremath{\alpha}}$ composed cetylpiridiniumchloride ${(\mathrm{CPCL})/\mathrm{h}\mathrm{e}\mathrm{x}\mathrm{a}\mathrm{n}\mathrm{o}\mathrm{l}/\mathrm{H}}_{2}\mathrm{O}.$ The mean modulus is obtained from measurement quadrupolar splittings perdeuterated hexanol by deuterium...

ADVERTISEMENT RETURN TO ISSUEPREVArticleDecoration of rough surfaces by chain graftingChristian Ligoure and Ludwik LeiblerCite this: Macromolecules 1990, 23, 5044–5046Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November 1990https://pubs.acs.org/doi/10.1021/ma00225a029https://doi.org/10.1021/ma00225a029research-articleACS PublicationsRequest reuse permissionsArticle Views155Altmetric-Citations31LEARN ABOUT THESE METRICSArticle...

A Monte Carlo study of the statistics loop and bridge formation between colloidal particles, in particular micelles, by telechelic polymers is presented. The experimental fact that hydrophobic outer blocks a triblock copolymer tend to stick into micelles aqueous solution mimicked counting only polymer chains with both ends on surface micelles. long inner hydrophilic block generated random walk procedure. It excluded from volume it can form either loop, stickers same micelle, or bridge, two...