Laboratoire de Physique des Solides - UMR 8502

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  • H. Alarcón, T. Salez, C. Poulard, J. - F. Bloch, É. Raphaël, K. Dalnoki-Veress, and F. Restagno, “Self-Amplification of Solid Friction in Interleaved Assemblies”, Physical review letters, vol. 116, no. 1, p. 015502, 2016.

  • B. Andreotti, O. Baumchen, F. Boulogne, K. E. Daniels, E. R. Dufresne, H. Perrin, T. Salez, J. H. Snoeijer, and R. W. Style, “Solid Capillarity: When and How does Surface Tension Deform Soft Solids?”, Soft Matter, vol. 12, no. 12, p. 2993-2996, 2016.
    Abstract: Soft solids differ from stiff solids in an important way: their surface stresses can drive large deformations. Based on a topical workshop held in the Lorentz Center in Leiden, this Opinion highlights some recent advances in the growing field of solid capillarity and poses key questions for its advancement.
    Tags: wetting.

  • F. Boulogne, F. Ingremeau, L. Limat, and H. A. Stone, “Tuning the receding contact angle on hydrogels by addition of particles”, Langmuir, vol. 32, no. 22, p. 5573-5579, 2016.
    Abstract: Control of the swelling, chemical functionalization, and adhesivity of hydrogels are finding new applications in a wide range of material systems. We investigate experimentally the effect of adsorbed particles on hydrogels on the depinning of contact lines. In our experiments, a water drop containing polystyrene microspheres is deposited on a swelling hydrogel, which leads to the drop absorption and particle deposition. Two regimes are observed: a decreasing drop height with a pinned contact line followed by a receding contact line. We show that increasing the particles concentration increases the duration of the first regime and significantly decreases the total absorption time. The adsorbed particles increase the pinning force at the contact line. Finally, we develop a method to measure the receding contact angle with the consideration of the hydrogel swelling.
    Tags: absorption.

  • F. Boulogne, Y. L. Kong, J. K. Nunes, and H. A. Stone, “Effect of the polydispersity of a colloidal drop on the drying induced stress as measured by the buckling of a floating sheet”, Physical Review Letters, vol. 116, no. 23, p. 238001, 2016.

  • L. Champougny, M. Roché, W. Drenckhan, and E. Rio, “Life and Death of not so "bare" bubbles”, Soft Matter, vol. 12, p. 5276–5284, 2016.

  • A. Chenneviere, F. Cousin, F. Boue, E. Drockenmuller, K. R. Shull, L. Leger, and F. Restagno, “Direct Molecular Evidence of the Origin of Slip of Polymer Melts on Grafted Brushes”, MACROMOLECULES, vol. 49, no. 6, p. 2348-2353, 2016.
    Abstract: Neutron reflectivity has been used to investigate the effect of shear on the conformation of hydrogenated polystyrene chains end-grafted on a silicon wafer and covered by a deuterated polystyrene melt, in the grafting regime where the grafted chains at equilibrium extend in the bulk up to their radius of gyration. An experimental setup has been built to shear the samples above their glass transition temperature and then quench them rapidly after the shear. The flow-induced distorted conformation of the end-tethered chains was characterized by neutron reflectivity. We show that the effect of the shear is a decoupling between the grafted chains and the bulk chains which leads to a strong slip of the polymer melt at the solid interface.
  • K. Dalnoki-Veress, T. Salez, and F. Restagno, “Why can't you separate interleaved books?”, PHYSICS TODAY, vol. 69, no. 6, p. 74-75, 2016.

  • E. Dressaire, A. Sauret, F. Boulogne, and H. A. Stone, “Drop impact on a flexible fiber”, Soft Matter, vol. 12, no. 1, p. 200-208, 2016.
    Abstract: When droplets impact fibrous media, the liquid can be captured by the fibers or contact then break away. Previous studies have shown that the efficiency of drop capture by a rigid fiber depends on the impact velocity and a threshold velocity was defined below which the drop is captured. However, it is necessary to consider the coupling of elastic and capillary effects to achieve an improved understanding of the capture process for soft substrates. Here, we study experimentally the dynamics of a single drop impacting on a thin flexible fiber. Our results demonstrate that the threshold capture velocity depends on the flexibility of fibers in a non-monotonic way. We conclude that tuning the mechanical properties of fibers can optimize the efficiency of droplet capture.

  • E. Forel, E. Rio, M. Schneider, S. Beguin, D. Weaire, S. Hutzler, and W. Drenckhan, “Volume and surface fraction of liquid dispersions”, Soft Matter, vol. 12, no. 38, p. 8025–8029, 2016.

  • A. Giustiniani, P. Guégan, M. Marchand, C. Poulard, and W. Drenckhan, “Generation of Silicone Poly-HIPEs with Controlled Pore Sizes via Reactive Emulsion Stabilization”, Macromolecular Rapid Communications, vol. 37, no. 18, p. 1527–1532, 2016.

  • Y. He, A. Salonen, A. Lecchi, M. Veber, and D. Langevin, “Adsorption of gemini surfactants at the air-water surface”, Colloid and Polymer Science, vol. 294, no. 3, p. 483-490, 2016.

  • S. Jones, E. Rio, C. Cazeneuve, L. Nicolas-Morgantini, F. Restagno, and G. S. Luengo, “Tribological influence of a liquid meniscus in human sebum cleaning”, COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, vol. 498, p. 268-275, 2016.
    Abstract: The interaction of surfactants in solution with hydrophobic materials is at the root of the process of detergency. Lipid containing micelles are formed in solution, and through water rinsing, these structures are washed out from the surface. The presence of air in the solution and the formation of foam add complexity to the system due to the increased proportion of water interfaces in contact with the surface. The latter situation is more difficult to understand. In this work, we propose, as a first step, to explore the role of the interfaces in cleaning silicon wafers previously coated with a model lipid mixture representing human sebum has been investigated. It turns out that the presence of interfaces enhances the cleaning efficiency. The effect of altering the surface properties of the silicon wafer was also investigated and it was found that changing the contact angle of the wafer brought a very strong effect on the cleaning efficiency. (C) 2016 Elsevier B.V. All rights reserved.
    Tags: Detergency, Foam-oil interaction, Surface energy.

  • H. Kim, F. Boulogne, E. Um, I. Jacobi, E. Button, and H. A. Stone, “Controlled uniform coating from the interplay of Marangoni flows and surface-adsorbed macromolecules”, Physical Review Letters, vol. 116, no. 12, p. 124501, 2016.

  • R. Ledesma-Alonso, E. Raphaël, L. Léger, F. Restagno, and C. Poulard, “Stress concentration in periodically rough Hertzian contact: Hertz to soft-flat-punch transition”, in Proc. R. Soc. A, 2016, vol. 472, p. 20160235.

  • A. Mikhailovskaya, J. Crassous, A. Salonen, and D. Langevin, “Following nanoparticles in complex turbid media”, RSC Advances, vol. 6, no. 26, p. 22103-22110, 2016.

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