Regensburg 2016 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 58: Wetting, Nano- and Microfluidics II (joint session CPP/DY, organized by CPP)
CPP 58.4: Talk
Thursday, March 10, 2016, 15:45–16:00, H42
Dynamics of Drop Condensation on Lubricant-Impregnated Surfaces — •Tadashi Kajiya1, Frank Schellenberger1, Periklis Papadopoulos2, Doris Vollmer1, and Hans-Jürgen Butt1 — 1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany — 2University of Ioannina, Dept. of Physics, 45110 Ioannina, Greece
We explored the dynamics of water drops condensing on a lubricant-impregnated surface, i.e., micropillar arrays infused with a ionic liquid. Growing drops were imaged in 3D using a laser scanning confocal microscope equipped with a temperature and humidity control. On a lubricant-impregnated hydrophobic micropillar array, different stages of condensation can be discriminated: - Nucleation on a lubricant surface. - Regular alignement between micropillars and formation of a three-phase contact line on a bottom of the substrate. - Deformation and bridging by coalescence, leading to a detachment of the drops from the bottom substrate to pillars*top faces. However, on a lubricant-impregnated hydrophilic micropillar array, the condensed water covers the micropillars by dewetting the lubricant. As a result, the surface loses its slippery property. Our results provide fundamental concepts how these solid/liquid hybrid surfaces can be applied for facile removal of condensed water.