Project C05 focuses on the amplification of electroosmotic flow (EOF) along superhydrophobic surfaces. EOF represents liquid transport by electric fields inside a channel or along a surface, and finds a variety of applications in the fields of microfluidics and lab-on-a-chip technology.
Theoretical results suggest that EOF along a superhydrophobic surface can be increased by more than two orders of magnitude compared to an unstructured surface.
For this purpose, auxiliary electrodes can be used to generate a surface charge density at the gas-liquid interfaces if the liquid wets the surface in the Cassie state (see figure). The goal of this project is to explore the limits of EOF amplification, for example due to the Cassie-to-Wenzel transition. If successful, the project could open new perspectives for the electric-field driven pumping of liquids.
|Prof. Dr. rer. nat. Steffen Hardt|
+49 6151 16-24274
|Johannes Hartmann M.Sc.|
+49 6151 16-24280
Publications and conference contributions
Sinn, Nico and Schür, Maximilian T. and Hardt, Steffen (2019):
No-contact electrostatic manipulation of droplets on liquid-infused surfaces: Experiments and numerical simulations.
114, In: Applied Physics Letters, (21), p. 213704, ISSN 0003-6951, DOI: 10.1063/1.5091836,
Sinn, Nico and Schür, Maximilian and Hardt, Steffen (2018):
No contact-manipulation of drops on a liquid-infused surface using electric fields.
In: 71st Annual Meeting of the APS Division of Fluid Dynamics, Atlanta, 18-20 November 2018, [Online-Edition: http://meetings.aps.org/Meeting/DFD18/Session/Q12.11],
[Conference or Workshop Item]