Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 18: Wetting, Superamphiophobicity, Micro- and Nanofluidics I
CPP 18.4: Vortrag
Dienstag, 1. April 2014, 10:15–10:30, ZEU 222
Droplet morphologies upon volume change on structured substrates — •Carsten Herrmann1, Ciro Semprebon2, Martin Brinkmann1,2, and Ralf Seemann1,2 — 1Saarland University, 66041 Saarbrücken — 2Max Planck Institute for Dynamics and Self-Organization, 37018 Göttingen
We experimentally investigate the general behavior of droplet morphologies sitting on micro-structured substrates upon volume change. The substrates provide geometries like triangular, rectangular, sinusoidal and trapezoidal cross section. The droplet morphologies are characterized by their eccentricity, i.e. the ratio of width to length, as function of the number of wetted grooves. The eccentricity of small droplets wetting just a few grooves characteristically varies upon an increase in drop volume and arrives at a constant value for sufficiently large droplets. The morphological changes depend sensitively on the wettability, aspect ratio and geometry of the underlying grooved substrate. The experimental results are compared quantitatively with numerical results computed by minimizing surface energies