Meniscus and Contact Angle in an Eye-Shaped Capillary.

This paper presents an approximate analytical solution to the augmented Young-Laplace equation for the meniscus profile in an eye-shaped capillary. The solution is valid for nonmonotonic forms of the disjoining pressure function and shows the relationship between the meniscus profile, contact angle, and disjoining pressure. The expression derived for the contact angle reduces to the widely used Deryaguin-Frumkin formula. Copyright 1998 Academic Press.