论文标题
石英晶体微平衡上浸入层的负载阻抗：与球体胶体悬浮液的比较
Load impedance of immersed layers on the quartz crystal microbalance: a comparison with colloidal suspensions of spheres
论文作者
论文摘要
由于存在不同类型（刚性，弹性和粘性）层的层（刚性，弹性和粘性）的存在，因此通过石英晶体微量平衡（QCM）测量的声负荷阻抗的分析理论，表现出通用的特性，例如“消失的质量”和诸如QCM柔软系统中的“消失质量”和正频移，诸如“消失的质量”和正频移。这些现象似乎与许多QCM测量的核心著名的熟食关系相矛盾，但是在这里我们表明它们是流体动力学的自然结果。我们将我们的一维浸泡板理论与刚性和柔性的亚微米大小悬浮球的三维模拟进行了比较，并为吸附的微米大小的胶体进行了实验结果，这些胶体产生了“负声质量”。平行行为揭示了QCM响应对流体动力学的高度敏感，即使对于吸附的胶体也是如此。我们的结论要求根据接触时的粘附力和弹性刚度对现有理论进行修改，在大多数情况下，这应该包括流体动力学。
The analytical theories derived here for the acoustic load impedance measured by a quartz crystal microbalance (QCM), due to the presence of layers of different types (rigid, elastic and viscous) immersed in a fluid, display generic properties, such as "vanishing mass" and positive frequency shifts, which have been observed in QCM experiments with soft-matter systems. These phenomena seem to contradict the well-known Sauerbrey relation at the heart of many QCM measurements, but here we show that they arise as a natural consequence of hydrodynamics. We compare our one-dimensional immersed plate theory with three-dimensional simulations of rigid and flexible sub-micron-sized suspended spheres, and with experimental results for adsorbed micron-sized colloids which yield a "negative acoustic mass". The parallel behaviour unveiled indicates that the QCM response is highly sensitive to hydrodynamics, even for adsorbed colloids. Our conclusions call for a revision of existing theories based on adhesion forces and elastic stiffness at contact, which should in most cases include hydrodynamics.
