Berlin 2015 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 15: P1: Interfaces and Thin Films
CPP 15.1: Poster
Monday, March 16, 2015, 16:00–19:00, Poster A
Study of contraction/spreading of microdroplets — •Tak Shing Chan1,2, Joshua D. McGraw1, Simon Maurer1, Thomas Salez3, Michael Benzaquen3, Elie Raphaël3, Karin Jacobs1, and Martin Brinkmann1,2 — 1Saarland University, Saarbrücken, Germany — 2Max-Planck institute, Göttingen, Geermany — 3ESPCI, Paris, France
A non-equilibrium liquid drop sitting on a smooth substrate will contract or spread depending on the microscopic contact angle and the initial shape of the drop. Previous studies assume a huge separation of length scales between the drop size R and the slip length b, as a result the drop remains as a spherical cap and interface deformations due to viscous effects are localized in a small region near the contact line . A well-known example is a drop spreading over a completely wetting surface, which follows Tanner*s law. In this project, we both experimentally and theoretically investigate contraction/ spreading of micro-droplets in the regimes where these two length scales are not far separated. Instead of a quasi-static shape during the evolution, the profiles display more structures in these regimes.