“…6b. This is described by a modied Cassie-Baxter model, 59 where the corresponding change in surface free energy, DF, upon displacing the surface of the liquid-gas interface by an amount, DA, is given by: In the previous expression g SL , g SV , and g LV are the solidliquid, solid-vapour, and liquid-vapour interfacial tensions, respectively and q indicates the contact angle on the textured surface. According to eqn (1), the equilibrium contact angle of the nanobrous scaffold for each electrospun material or blend can be related to that of the corresponding spin-cast samples, q 0 , and to the scaffold surface topology by the following expression: cos q ¼ rFcos q 0 À (1 À F).…”