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    Drop shape analysis for determination of dynamic contact angles by double sided elliptical fitting method

    Year: 2017

    Journal: Meas. Sci. Technol., Volume 28, APR

    Authors: Andersen, Nis Korsgaard; Taboryski, Rafael

    Organizations: Danish National Advanced Technology Foundation (HTF) through the "Advanced Technology Platform NanoPlast" [007-2010-2]

    Keywords: contact angle; wetting behaviour; roll-off angle; drop shape analysis; axisymmetric drop shape analysis (ADSA); triple-line; contact angle hysteresis

    Contact angle measurements are a fast and simple way to measure surface properties and is therefore widely used to measure surface energy and quantify wetting of a solid surface by a liquid substance. In common praxis contact angle measurements are done with sessile drops on a horizontal surface fitted to a drop profile derived from the Young-Laplace equation. When measuring the wetting behaviour by tilting experiments this is not possible since it involves moving drops that are not in equilibrium. Here we present a fitting technique capable of determining the contact angle of asymmetric drops with very high accuracy even with blurry or noisy images. We do this by splitting the trace of a drop into a left and right part at the apex and then fit each side to an ellipse.
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