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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

The liquid-glass-jamming transition in disordered ionic nanoemulsions

Braibanti, Marco ; Kim, Ha Seong ; ªenbil, Nesrin ; Pagenkopp, Matthew J. ; Mason, Thomas G. ; Scheffold, Frank

In: Scientific Reports, 2017, vol. 7, no. 1, p. 13879

In quenched disordered out-of-equilibrium many-body colloidal systems, there are important distinctions between the glass transition, which is related to the onset of nonergodicity and loss of low-frequency relaxations caused by crowding, and the jamming transition, which is related to the dramatic increase in elasticity of the system caused by the deformation of constituent objects. For...

Université de Fribourg

Entropic, electrostatic, and interfacial regimes in concentrated disordered ionic emulsions

Kim, Ha Seong ; Scheffold, Frank ; Mason, Thomas G.

In: Rheologica Acta, 2016, vol. 55, no. 8, p. 683–697

We develop a free energy model that describes two key thermodynamic properties, the osmotic pressure Π and the linear elastic shear modulus G′p (i.e. plateau storage modulus), of concentrated monodisperse emulsions which have isotropic, disordered, droplet structures, and are stabilized using ionic surfactants. This model effectively incorporates the concept of random close packing or...