Abstract
We examine the contact angle hysteresis for n-octane droplets on a n-hexadecyltrichlorosilane-coated silicon wafer in the vicinity of a first-order wetting transition with wetting temperature Tw = 49.5 °C. A pinning transition is observed at Tp = 46.8 °C for the receding contact angle. Above this temperature, the contact line for receding droplets is pinned; consequently, the receding contact angle θr = 0°. We use contact angle data to quantify the substrate surface energy difference, Δσ(T) = σsv(T) − σsl(T), and the relative surface heterogeneity, h0/σlv, as a function of temperature T where σij is the surface energy between phases i and j.
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