Contact angle-based predictive model for slip at the solid–liquid interface of a transverse-shear mode acoustic wave device

Abstract

We have revisited the Blake–Tolstoi theory [Coll. Surf. 47, 135 (1990)] for molecular and hydrodynamic slip and applied it to the fundamental description of acoustic wavedevices coupled to a liquid of finite thickness. The aim is to provide a framework for a predictive model for slip, based on surface–liquid interactions and contact angle. This theory provides a description of slip that links hydrodynamic boundary slip to a schematic, molecular description involving the wettability of the liquid–solid interface. We redevelop the model, using current acoustic sensors notation, then evaluate its qualitative behavior as a predictive model for slip length in the context of acoustic wavedevices. Finally, we discuss the limitations of the model and consider the advantages of a predictive model for boundary slip.