Dresden 2026 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 26: Focus Session: Water – from Atmosphere to Space III (joint session CPP/DY)
DY 26.4: Talk
Tuesday, March 10, 2026, 15:00–15:15, ZEU/LICH
Contact line dynamics on moving fibers measured by X-ray holography — •Louisa E. Kraft1,2, Jens Lucht3, Fiona Berner1,2, Hannes P. Hoeppe3, Tobias Eklund1,2, Yizhi Liu1, Markus Osterhoff3, Tim Salditt3, Hans-Jürgen Butt1, and Katrin Amann-Winkel1,2 — 1Max Planck Institute for Polymer Research, Mainz, Germany — 2Johannes Gutenberg University, Institute for Physics, Mainz, Germany — 3Georg-August-University, Institute of X-ray Physics, Göttingen, Germany
The wetting properties of solid surfaces are important for many natural and industrial processes, especially with respect to dynamic wetting. The wetting dynamic of solid surfaces, in particular the quantitative description of the dynamic contact angles, is still under debate. Dynamic contact angle variations connect macroscopically measured quantities with microscopic processes. Most studies rely on optical or confocal microscopy which limits the experimental access to the sub-microscopic region where these processes take place. We present data from X-ray holography experiments, imaging the three-phase contact line on moving glass fibers with an improved spatial resolution of about 450 nm combined with a temporal resolution of 10 Hz. We used the GINIX nanofocusing setup at the P10 beamline at PETRA III (DESY, Hamburg). The used glass fibers were pulled out of a liquid bath filled with varying aqueous solutions while changing the lateral velocity. We could clearly observe a decrease of the receding dynamic contact angle with increasing fiber velocity confirming the predictions of dynamic wetting theory.
Keywords: Dynamic contact angle; X-ray holography; Dynamic wetting; Three-phase contact line; Water