Excess shear force exerted on an oscillating plate due to a nearby particle
Itzhak Fouxon, Boris Rubinstein, Alexander M. Leshansky
Abstract
Quartz crystal microbalance with dissipation monitoring (QCM-D) is a standard analytical tool in soft matter and life sciences; its resonant frequency and bandwidth are very sensitive to a tiny amount of substance (e.g., molecular assemblies, proteins, cells) adhering to the quartz resonator surface. Since the resonator is often immersed in aqueous solution set in motion by surface oscillations, viscous forces also impact measurements. Thus, reliable interpretation of QCM-D results requires quantitative study of the shear stress due to the complex flow affected by particles. We examine theoretically the hydrodynamic stress due to suspended and adsorbed particles and their impact on QCM-D response.