Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 106: Wetting and Liquids at Interfaces and Surfaces II (joint session CPP/DY/O)

CPP 106.3: Vortrag

Freitag, 20. März 2020, 10:15–10:30, ZEU 260

Formation of a thin film during drop merging leads to fingering instability — •Peyman Rostami1,2 and Günter Auernhammer1,21Max Planck Institute for Polymer Research, 55128, Mainz, Germany — 2Leibniz Institute of Polymer Research, 01069, Dresden, Germany

The coalescence and interaction between two drops have been the subject of intensive studies in recent years [1], due to its wide range of application and the presence in the nature.

Here, we study the merging of partially miscible drop. We deposit drops of different liquids on a substrate. Under appropriate conditions, the merging process generates an instability which resembles the Rayleigh-Plateau instability. If the liquid with higher surface activity is deposited as a second droplet. Its vapor can diffuse through the air and induce a Marangoni flow inside the already deposited droplet. This induced flow can pull a thin liquid layer over the surface , which decays into drops by a Rayleigh-Plateau instability.

We present a detailed study of this instability analyzing the onset of the instability and its characteristic length scales. Finally, a model is presented to explain the Marangoni flow induced by the gas phase. This model is validated by particle tracking.

References [1] S. Karpitschka, C. Hanske, A. Fery, and H. Riegler, Langmuir, vol. 30, no. 23, pp. 6826*6830, 2014.

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