CHARACTERIZATION OF A QUARTZ CRYSTAL MICROBALANCE WITH SIMULTANEOUS MASS AND LIQUID LOADING
CHARACTERIZATION OF A QUARTZ CRYSTAL MICROBALANCE WITH SIMULTANEOUS MASS AND LIQUID LOADING
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DOI：
10.1021/ac00020a015
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发表时间：
1991-10-15
影响因子：
7.4
通讯作者：
FRYE, GC
中科院分区：
文献类型：
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作者：
MARTIN, SJ;GRANSTAFF, VE;FRYE, GC
利用连续介质机电模型，推导了同时加载表面质量层和接触牛顿液体的AT切石英晶体微天平的电导纳。该导纳表达式被用来推导出描述QCM在这些负载条件下的近谐振电特性的集总元件等效电路模型。由此得到的模型是一个改进的巴特沃斯-范戴克等效电路，具有与石英、扰动质量层和接触液体的物理性质明确相关的电路元件。从模型中预测了质量和液体负载对基波和三次谐波的影响，并与阻抗分析仪的实验测量结果进行了比较。表面质量积累导致共振峰的频率简单平移，而增加接触溶液的密度-粘度积导致共振峰的平移和衰减。利用该模型，表面质量的变化可以与溶液性质的变化区分开来。
With a continuum electromechanical model, the electrical admittance has been derived for an AT-cut quartz crystal microbalance (QCM) simultaneously loaded by a surface mass layer and a contacting Newtonian liquid. This admittance expression is used to derive a lumped-element equivalent circuit model that describes the near-resonance electrical characteristics of the QCM under these loading conditions. The resulting model is a modified Butterworth-Van Dyke equivalent circuit, having circuit elements that are explicitly related to physical properties of the quartz, perturbing mass layer, and contacting liquid. The effects of mass and liquid loading on the fundamental and third harmonic resonances are predicted from the model and compared with experimental impedance analyzer measurements. Surface mass accumulation causes a simple translation in frequency of the resonance peak, while increasing the density-viscosity product of the contacting solution causes both a translation and a damping of the resonance peak. With the model, changes in surface mass can be differentiated from changes in solution properties.