BPCPPDYSOE21 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Complex Fluids and Soft Matter 3 (joint session DY/CPP)
CPP 13.1: Vortrag
Dienstag, 23. März 2021, 14:30–14:50, DYc
How Frost Forms and Grows on Lubricant Impregnated Surfaces — •Lukas Hauer1, William S.Y. Wong1, Lou Kondic2, and Doris Vollmer1 — 1Max Planck Institute for Polymer Research, Mainz, Germany — 2Department of Mathematical Sciences, NJIT, Newark, USA
In many technical applications the formation of frost and ice displays a hazard to the steady functionality of devices. This motivates the development of new materials to tackle the reduction of frosting and icing on surfaces. While icing on surfaces is commonly studied by localized nucleation mechanisms, the formation of frost is comparable more complicated: Formation of condensate droplets, freezing, and frost front propagation are multi-physical processes on multiple time and length scales. Lubricant impregnated surfaces are known for improved anti-icing properties. They experience lower ice drop adhesion and allegedly delayed surface frost formation. We show that frost formation can induce immensely strong capillary forces that could result in surface damage, lubricant depletion and the loss of anti-icing properties. Laser scanning confocal microscopy enables us to monitor the dynamic lubricant migration during condensation frosting on micro-structured surfaces. We present a quantitative model of the lubricant migration, utilizing lubrication theory. This work serves to improve understanding of lubricant dynamics during condensation frosting, providing roadmaps towards the future design of anti-icing surfaces.