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Receding contact angle is the lowest possible contact angle on a given surface. Receding angle is measured on previously wetted surface.
Contact angle hysteresis can tell you about the homogeneity of your surface coating.
One should always measure the advancing and the receding contact angle to get the true picture of the surface wettability.
Due to a wide range of applications, the measurement of wettability, i.e., the contact angle measurement can be done with several different methods.
More and more research interest is being put on functional coatings. New measurement techniques are required to evaluate them.
Contact angle hysteresis is often measured with so-called tilting cradle or plate method. The measurement can be done either manually or automatically.
Dynamic contact angle measurements with the needle method has been automated for reliable and repeatable results.
Contact angle hysteresis can be measured with optical (needle and tilting methods) and force (Wilhelmy method) tensiometers.
