Investigation of the Contact Angle between Indium (l) and an Aluminum Substrate in Ultrahigh Vacuum

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Abstract
The contact angle of liquid indium resting on an aluminum plate in which both surfaces were presumably atomically clean was measured in ultrahigh vacuum as 170°±10°, at a temperature of 158°±2°C. The deviation in angle was a function of the position around the periphery of the drop due apparently to variations in crystallographic orientation of the aluminum grains in the surface. The surface energy of the liquid indium was determined by the Bashforth and Adams technique in this system as 600 dyn/cm.