Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 106: Wetting and Liquids at Interfaces and Surfaces II (joint session CPP/DY/O)

CPP 106.6: Vortrag

Freitag, 20. März 2020, 11:00–11:15, ZEU 260

Liquid-liquid phase separation in contact with deformable surfaces — •Hansol Jeon1,2 and Stefan Karpitschka11Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany — 2Georg-August-Universität Göttingen

The capillary forces of droplets on top of soft solids deform the solid surface into sharp wetting ridges. The amplitude of the wetting ridge is governed by elasto-capillary length, the ratio of liquid surface tension to the solid's shear modulus. Previous experiments on soft wetting used large liquid-vapour surface tensions and thus were in a highly nonlinear regime regarding the response of the solid. This led to debates in the literature regarding the effects of strain dependent solid surface tensions or the dynamics of soft wetting. Liquid interfaces with small surface tensions could instead probe the linear regime of soft wetting and shed new light onto the static and dynamic behaviours of solid surface tension. Thus we investigate the liquid-immersed case of soft wetting, aiming for a control of the liquid and solid surface tensions. We tested various liquid combinations and explored a wide range of surface tensions and substrate shear moduli, finding valid Neumann constructions in all cases.

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