Constrained Sessile Drop (Constrained SD) is a method for purity testing of contact angle test liquids as well as for measurements of highly heated liquids. In this method, the curvature of the drop surface is analyzed by video. This requires a single, horizontal droplet, which must be large and strongly curved and at the same time absolutely symmetrical. To ensure this, sample platforms are used, which are also offered by Krüss. It is a fast procedure that can be smoothly integrated into daily quality routines. The Constrained Sessile Drop method is suitable for the analysis of melts at high temperatures, for example for hot melts. Under standard conditions, classical mechanical tensiometry is preferable.
Read the full article in mo issue 7-8/2022 or online here!