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.

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