Measurements of Molecular Slip and Contact Line Motion Using a Quartz Crystal Microbalance

Abstract eng:
The liquid/solid boundary condition and the stick-slip motion of a three-phase contact line represent complex problems where our understanding is incomplete. We have performed a series of experiments that address these issues using a quartz crystal microbalance (QCM). Our first experiment focuses on the evaporation of a sessile drop. The stick-slip motion of the contact line manifests as a sharp increase in frequency of the QCM, followed by a sharp decrease, whereas the dissipation displays a single sharp peak. QCMs pre-cleaned in an oxygen plasma environment exhibited a significantly reduced occurrence and magnitude of these features. Second, a drop of liquid is grown on the QCM in the presence of a second, ambient liquid. The liquids are chosen so that their bulk effects on the QCM frequency and dissipation are identical in the presence of no-slip. Deviations from the conventional theory are identified as anomalous interfacial dynamics, such as slip.

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