Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 87: Solid-liquid interfaces: Structure, spectroscopy

O 87.2: Vortrag

Donnerstag, 12. März 2026, 15:15–15:30, TRE/PHYS

How is the hydrophobic force modified by an oscillation frequency in saline conditions? — •Chiara Wagner, Paul Stöcher, Laura Mears, and Markus Valtiner — Vienna University of Technology, Vienna, Austria

There have been many investigations over the years regarding the mechanism behind the hydrophobic force and over how long a range it can be felt [1]. We present a detailed set of AFM force measurements of hydrophobic SAM modified surfaces, with varying salt concentration and oscillation frequency (0-2kHz). We observe dynamic changes in the force curve characteristics with both salt concentration and oscillation frequency. The changes lead to a reduction of the average force with increasing applied frequency, while multiple distinct characteristic curves are present and enhanced by certain conditions. We also notice changes in the range of the force away from the surface. Altogether, the results we will present bring new insight into the mechanism of hydrophobic interactions.

[1] W. A. Ducker and D. Mastropietro, Current Opinion in Colloid & Interface Science, 2016, 22, 51*58.

Keywords: AFM; hydrophobicity; interface physics; hydrophob; saline condition