Methods of Surface-Tension Experimental Evaluation
Abstract
There are two methods of liquids surface-tension evaluation: the plate detachment method and the balanceddrop method. These methods are performed with an experimental installation that allows to slide plates with an accuracy up to 0,01 mm. An amount of 0,05–0,2 ml of liquid is poured between the plates so that the drop contacts both plates. Then the drop was stretched up to its rupture or till upper and lower surfaces of the drop become equally round. The drop profile is studied with the USBmicroscope, and pictures of the analyzed liquid drop area taken to evaluate the wetting angle. Distil water, glycerin, ethanol, and GK transformer oil are used as experimental liquids. The values of liquids surface-tension obtained in experiments correspond well with the reference data. These methods demonstrate the following advantages: simplicity of preparation, quickness, and little amount of liquids.
DOI 10.14258/izvasu(2016)1-15
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