Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Wednesday: New Methods and Developments, Frontiers of Electronic Structure Theory
O 58.13: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
Wettability investigation of microscale water droplets on silicon substrate using atomic force microscopy — •Mohammadali Hormozi1, Marvin Hoffer1,2, Pauline Brumm2, and Regine von Klitzing1 — 1Soft Matter at Interfaces, Department of Physics, Technical University of Darmstadt, 64289 Darmstadt, Germany — 2Institute of Printing Science and Technology (IDD), Technische Universität Darmstadt, Magdalenenstraße 2, 64289 Darmstadt, Germany
The wettability of a particular substrate by a liquid drop is of interest in many scientific fields. This phenomenon is often described by the contact angle between the considered liquid and substrate. This parameter is an important boundary condition, especially for the wetting of mixtures and solutions. This study shows a methodology for evaluating the contact angle of different droplets with a base diameter down to 0.5 micrometers. 3D topography of water droplets -generated through condensation and Inkjet printing on a silicon substrate- has been determined using Atomic Force Microscopy. Also, the topography of printed mixture droplets including water-glycerol and water-glycerol-isopropanol has been measured. Different curves have been fitted to a 2D cross-section of each droplet, which provides information about their contact angle. The contact angle of the mixtures deviates from the macroscale contact angle at the vicinity of the three-phase contact line; however, this phenomenon cannot be seen in pure water droplets. While no effect of droplet diameter could be detected for diameters, ranging from 0.5 to 30 micrometers, the macroscopic contact angle of droplets is several degrees higher.