Dresden 2026 – scientific programme

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O: Fachverband Oberflächenphysik

O 22: Surface dynamics – Poster

O 22.6: Poster

Monday, March 9, 2026, 18:00–20:00, P2

Thermo-osmotic flows at the Chemically Patterned Surfaces — •Neerdhi Goswami and Frank Cichos — Universität Leipzig Linnestr. 5 04103 Leipzig Germany

The boundary flows at a solid-liquid interface are governed by the interaction of the solid and liquid, specifically by the excess enthalpy of these interactions. Consequently, chemical modification of surfaces alters boundary flow fields. By generating spatially dependent patterns of solid-liquid interactions, we can not only shape various flow fields but also directly compare excess interaction enthalpies between modified and unmodified regions.

This study analyzes opto-thermo-osmotic flow fields at a thiol-patterned gold-water interface to provide a quantitative microscopic picture of dynamic interfacial interactions through comparative analysis. Thiol stripes were generated through micro-contact printing, creating alternating patterns of modified and unmodified gold regions. Surface plasmon resonance (SPR) imaging confirmed thiol addition by detecting the characteristic frequency shift upon adsorption.

This quantitative characterization of interfacial interactions provides fundamental insights into how surface chemistry modulates boundary flows, with implications for designing responsive microfluidic systems and optimizing interfacial processes in precision separation and manipulation applications.

Keywords: Thermo-osmotic flows; Boundary flows; Solid-Liquid interfacial dynamics; Solid-Liquid interactions; Flow fields