Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster 1

CPP 12.37: Poster

Montag, 5. September 2022, 18:00–20:00, P1

Predicting static wetting morphology of aqueous drops on lubricated surface — •Shivam Gupta, Bidisha Bhatt, Meenaxi Sharma, and Krishnacharya Khare — Indian Institute of Technology Kanpur, Kanpur, India

Static wetting behavior of liquid drops on thin liquid-coated solid surfaces is very different compared to dry solid surfaces. Conventionally, the equilibrium wetting behavior on deformable (soft or thin liquid coated) surfaces is characterized by the Neumann's contact angle, which solely depends on the various interfacial energies of the participating phases. However, due to the difficulty in identifying the Neumann's point, it is often convenient to define apparent contact angles on such surfaces. By controlling the various interfacial energies, drops can be either made to directly contact the substrate or float on the thin liquid layer supported by the substrate resulting in different apparent angles and thus different wetting morphology. Although such systems are highly prevalent, however, to our knowledge, there is no study reported to date that can beforehand predict the static wetting behavior and the quasi-static interfacial profiles as a function of various system parameters, e.g., substrate wettability, thickness of the liquid film, and drop volume. We propose a method to beforehand predict the interfacial profiles using numerical computation with Surface Evolver software. Experimental studies are also performed to validate the simulations. A good quantitative agreement is found for the variation of the drop contact angle as a function of various systems parameters.