The deposition of a coating on a solid generates new interfaces between dissimilar
materials and involves considerations of wettability, spreading, interface evolution, and
adhesion. The wettability of a solid by a liquid is characterized in terms of the angle of
contact that the liquid makes on the solid. 1, 2 The contact angle, θ, is obtained from a
balance of interfacial tensions (Figure 1) and is defined from Young's equation, according to
which σ lv. cosθ+ σ ls= σ sv where σ lv, σ ls, and σ sv are the interfacial tensions at the …