Condensed-Matter Physics & Materials Science Seminar

"Shear-induced ordering in liquid μ-jets revealed by x-ray cross-correlation analysis"

Presented by Verena Markmann, Deutsche Elektronen-Synchrotron (DESY), Germany

Friday, January 29, 2021, 11:00 am — Videoconference / Virtual Event (see link below)

The delivery of colloidal dispersions by microfluidic jet devices has increased scientific and technological interest in the last decades, especially at synchrotrons and Free Electron Laser facilities (FEL). The applications include supercooled liquid production by evaporative cooling of µm-sized droplets and sample delivery schemes for materials sensitive to radiation damage. However, low sample volumes often require µm-thin jets. The shear rates applied in thin liquid jets are in the regime of γ ?≈10^5 s^(-1) and thus several orders of magnitude higher than in conventional rheometer geometries.

In this seminar I will present the effects of shear on the microscopic ordering of particles in µ-jets and discuss effects of different jet geometries and nozzle sizes. Therefore, I will introduce an approach to combine rheology and time- and space-resolved small angle x-ray scattering techniques. The applicability of x-ray cross-correlation analysis for the quantification of anisotropic particle arrangements and their behavior after shear cessation will be discussed.

Hosted by: Ian Robinson

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