Workshop - Scattering and Dynamics of Flowing Soft Material

Session

Later afternoon session - Colloids

10 Dec 2018, 16:00

Tera (Elite Hotel Ideon)

27. Keynote 3 - Vorticity banding in shear-thickening suspensions

Dr Romain Mari (CNRS, University Grenoble-Alpes, France)

10/12/2018, 16:00

Discontinuous shear thickening of dense suspensions is a phenomenon in which, at a specific shear rate, the viscosity increases discontinuously often by orders of magnitude. Recent modeling of the phenomenon suggests that the viscosity jump in rate-controlled rheometry corresponds to an underlying S-shaped flow curve in stress-controlled conditions. This nonmonotonic rheology was observed in...

28. Contr. Talk 3 - Flow-assisted droplet assembly in a 3D microfluidic channel

Zhouyang Ge

10/12/2018, 16:40

Self-assembly of soft matter, such as droplets or colloids, has become a promising scheme to engineer novel materials, model living matter, and explore non-equilibrium statistical mechanics. In this talk, we present detailed numerical simulations of few non-Brownian droplets in various flow conditions, specifically, focusing on their self-assembly within a short distance in a three-dimensional...

29. Contr. Talk 4 - Linking transient shear profiles to the microscopic structure and dynamics in concentrated colloidal suspensions

Dr Andreas Pamvouxoglou (Heinrich Heine University Dusseldorf)

10/12/2018, 17:00

We performed start-up experiments with concentrated hard-sphere suspensions around the glass transition. Rheo-confocal experiments were carried out to link the macroscopic rheological response to the single-particle structure and dynamics. During the start-up of shear, suspensions of large particles (diameter ≈1.6μm) showed a transient non-linear velocity, resembling shear bands without a...

30. Keynote 4 - Quantitative Light Microscopy of Dense Suspensions: Colloid Science at the Next Decimal Place

Prof. Itai Cohen (Physics, Cornell University, USA)

10/12/2018, 17:20

“Why should one wish to make measurements with ever increasing precision? Because the whole history of physics proves that a new discovery is likely to be found lurking in the next decimal place.” (Floyd K. Richtmyer, 1931)

Since the days of Perrin, microscopy methods have played an important role in the study of colloidal suspensions. Along with the continued development of new imaging...

61. Contr. Talk 5 - The effects of high-power ultrasound on colloidal gels

Noémie Dagès

10/12/2018, 18:00

Low-intensity ultrasound is widely used to probe and image biological tissues.Yet, yltrasound can also be used at high power to destroy nodules or burn tumors. We try to transpose and understand the latter effects in soft matter. We first show that high-power ultrasound softens colloidal gels. Upon applying ultrasound at 45kHz for a few tens of seconds on various gels in a rheometer, we find...