Application of the sessile drop method to the determination of the surface energy and density of liquids wetting the backing material
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A procedure, based on the sessile drop method, is proposed for determining the free surface energy and density of melts wetting the material of solids in contact with the latter.
On the examples of ethyl alcohol and vacuum oil, which wet copper, the possibility is shown of forced generation of drops with the maximum diameter on copper backing plates having the shape of a solid of revolution with an acute angle between the horizontal and the side surface. A linear relationship is shown to exist between the maximum angle formed by the horizontal and the tangent at any point on the wetting perimeter, and the edge point angle of the backing plate.
The method proposed was applied to the high-temperature determination of the free surface energy of copper and calcium fluoride on molybdenum backing plates.
The sessile drop method in conjunction with the proposed procedure for determining the free surface energy and density of liquids wetting the backing material is universal.
KeywordsCopper Fluoride Molybdenum Maximum Diameter Free Surface Energy
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