Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)

O 58.70: Poster

Mittwoch, 13. März 2013, 18:15–21:45, Poster B1

Evaporation of nanosized droplets on heated substrates — •Jianguo Zhang, Frederic Leory, and Florian Müller-Plathe — Theoretical Physical Chemistry,Technische Universität Darmstadt , Germany

The evaporation of nanometer scale droplets (about 10 nm in diameter) on flat heated substrates has been studied. The systems were modeled by means of Lennard-Jones potentials. The interaction between the liquid and the substrate atoms was varied to reproduce a range of equilibrium contact angles from 120 to 60 degrees. The evaporation process in a closed fixed volume was followed in terms of time variations of the contact angle. It was observed that the contact angle is a monotonic decreasing function of time. However, for large equilibrium contact angles (weak solid-liquid interactions), the respective time decays are characterized by larger characteristic times than for small contact angles (strong solid-liquid interactions). The evaporation has also been characterized with spatial resolution. It was observed that the evaporation process preferentially occurs in the vicinity the three-phase contact line in the case of weak solid-liquid interactions. This observation is more contrasted in the case of the strongest solid-liquid interactions.