Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 97: Wetting and Liquids at Interfaces and Surfaces I (joint session CPP/DY/O)

O 97.6: Vortrag

Donnerstag, 19. März 2020, 10:45–11:00, ZEU 255

Depleting Hydrogels with Oil Flows — •Philipp Baumli1, Emanuela Lorusso2, Lukas Hauer1, Azadeh Sharifi-Aghili1, Katharina Hegner1, Maria D'Acunzi1, Burkhard Duenweg1, Jochen Gutmann2, Hans-Jürgen Butt1, and Doris Vollmer11Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany — 2Deutsches Textilforschungszentrum Nord-West ÖP GmbH, Adlerstraße 1, 47798 Krefeld, Germany.

Hydrogels are ubiquitous in our daily lives. Applications range from jelly pudding and diapers to scaffolds in tissue engineering. A hydrogel-coating is covalently attached to a micropillar array. Swelling the hydrogel-coating with water establishes a liquid-infused surface (LIS). On LIS, liquid-depletion is synonymous with loss of functionality.

We demonstrate that the hydrogel-based LIS can be kept lubricated upon a shear-flow of oil for a wide variety of flow conditions independent of the exact nature of the hydrogel-coating. Dehydration of the hydrogel-coating is followed by confocal laser scanning microscopy and progresses linearly independent of flow conditions and hydrogel. The mechanism is explained with the help of an extended diffusion model.

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