A capillary pressure method for measurement of contact angles in powders and porous media

Abstract

An absolute method for determining contact angles on finely divided substrates has been developed by using a static capillary rise technique. The method makes use of a thermodynamic treatment of capillary rise which relates the observed pressure difference in the powder to both the specific surface area of the powder or porous material and the contact angle of the liquid on the powder. Both advancing and receding angles can be obtained from the method. © 1986.