Dresden 2020 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 45: Microfluidics (joint session DY/CPP)

DY 45.4: Talk

Wednesday, March 18, 2020, 17:45–18:00, ZEU 147

Positioning of Gold Nanoparticles by Thermo-Osmotic Flows in Electrolytes — •Martin Fränzl and Frank Cichos — Molecular Nanophotonics Group, Peter Debye Institute for Soft Matter Physics, Universität Leipzig, Germany

The application of gold nanoparticles as plasmonic sensors in fluidic applications requires exact positioning which is often only achieved by rigid templating using physical or chemical lithography. Here we investigate the control of single and multiple gold nanoparticles with the help of optically induced thermo-osmotic flows in electrolyte solution. Our control is using a thin gold film on substrates to allow for a local heating of an electrolyte solution in a liquid film. The local temperature rise at the gold induces thermo-osmotic flows at the gold electrolyte solution. By tuning the electrolyte concentration, we to confine the mobility of the gold-nanoparticles to a two-dimensional layer at a distance of a few 10 nanometers from the gold film in which a positioning with the help of thermo-osmotic flows is easily possible. The experimental results of the gold nanoparticle dynamics are compared the theoretical predictions.