Dresden 2020 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 55: Poster: Turbulence; Complex Fluids; Microfluidics; Droplets and Wetting

DY 55.14: Poster

Thursday, March 19, 2020, 15:00–18:00, P1A

Manipulation of thermo-osmotic flows in thin liquid films — •Nicola Andreas Söker and Frank Cichos — Universität Leipzig, Peter-Debey-Institut für Physik der weichen Materie

We study the creation and manipulation of flows in a micrometer sized film of water by thermo-osmotic surface flows along the confining walls. A local temperature profile is created by optically heating a gold film inducing osmotic flows along the confining walls. Chemically patterning the gold surfaces creates asymmetric flows. The progammable directed flow might be used to position sub micrometer diffusing objects e.g. to position single biopolymers in a thermo phoretic trap structure presently developed [1] in our group. To characterize the emerging flow fields metal nano particles are used as tracers [2]. We also study the interference of the thermo-osmotic flows originating from multiple heating spots at the gold film.

[1] Fränzl, Martin., Thalheim, Tobias., Adler, Juliane. et al. Thermophoretic trap for single amyloid fibril and protein aggregation studies. Nat Methods 16, 611-614 (2019)

[2] Andreas P. Bregulla, Alois Würger, Katrin Günther, Michael Mertig, and Frank Cichos Phys. Rev. Lett. 116, 188303 * Published 5 May 2016