  In this paper, a novel method for the measurement of equilibrium contact
angle of highly volatile binary liquids is proposed. The proposed method, which
combines finite element method and energy equilibration, is able to calculate
the solid-liquid contact area. The calculated solid-liquid contact area can
then be used to estimate the equilibrium contact angle. Using the proposed
approach, the contact angles of binary liquid droplet on a microgrooved and
smooth polycarbonate substrate were calculated. The proposed method can be an
efficient tool for finding the contact angle of all liquids (both volatile and
non-volatile).
