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    Université de Fribourg

    Observation of strongly heterogeneous dynamics at the depinning transition in a colloidal glass

    Şenbil, Nesrin ; Gruber, Markus ; Zhang, Chi ; Fuchs, Matthias ; Scheffold, Frank

    In: Physical Review Letters, 2019, vol. 122, no. 10, p. 108002

    We study experimentally the origin of heterogeneous dynamics in strongly driven glass-forming systems. Thereto, we apply a well-defined force with a laser line trap on individual colloidal polystyrene probe particles seeded in an emulsion glass composed of droplets of the same size. Fluid and glass states can be probed. We monitor the trajectories of the probe and measure displacements and...

    Université de Fribourg

    Diffusing wave microrheology of highly scattering concentrated monodisperse emulsions

    Kim, Ha Seong ; Şenbil, Nesrin ; Zhang, Chi ; Scheffold, Frank ; Mason, Thomas G.

    In: Proceedings of the National Academy of Sciences, 2019, vol. 116, no. 16, p. 7766–7771

    Motivated by improvements in diffusing wave spectroscopy (DWS) for nonergodic, highly optically scattering soft matter and by cursory treatment of collective scattering effects in prior DWS microrheology experiments, we investigate the low-frequency plateau elastic shear moduli G′p of concentrated, monodisperse, disordered oil-in- water emulsions as droplets jam. In such experiments, the...

    Université de Fribourg

    Deformation of the contact line around spherical particles bound at anisotropic fluid interfaces

    Şenbil, Nesrin ; Dinsmore, Anthony D.

    In: Soft Matter, 2017, vol. 13, no. 44, p. 8234–8239

    When a particle adsorbs at a liquid interface, the 3-phase contact line geometry depends on the shape of the particle and of the liquid interface. The shape of the contact line is the key to controlling capillary forces among particles, and is therefore a useful means to direct assembly of interfacial particles. We measured the shape of the contact line around millimeter-sized PDMS-coated...