Abstract
The acoustic impedance of a monolayer adsorbed on the surface of a resonating quartz microbalance produces a shift in both the frequency and vibrational amplitude of the oscillator. The relation between acoustic impedance and fluctuations in film momentum is rigorously derived via the fluctuation-dissipation theorem within the context of two-dimensional fluid mechanics. The calculations reveal that the film-substrate interfacial viscosity can be deduced from measurements of acoustic impedance.
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