Abstract
The frequency response of quartz crystal microbalance loaded by single-drop liquid is studied in this paper. Previous studies have shown that the relationship between resonant frequency and properties of liquid by completely immersing one side of the crystal in liquid. In this work, only localized portion of crystal was wetted by liquid droplet. Repeated experiment shows the relationship between liquid property include viscosity and density to resonant frequency. Furthermore, Theoretical formula describing the frequency change of the quartz crystal microbalance with liquid property is proposed. The predicted results showed distinct coincide with experimental results.
Highlights
The quartz crystal microbalance(QCM) has been widely used as highly sensitive sensor which commonly configure with electrode on both sides of a thin disk AT-cut quartz
In order to got the more information about the frequency response for liquid droplet, three different solutions include water, 0.01g/ml Nacl, 0.1 g/ml Nacl were choose in this study
The resonant frequency shifted on account of the effective mass of liquid droplet contained within this decay length
Summary
The quartz crystal microbalance(QCM) has been widely used as highly sensitive sensor which commonly configure with electrode on both sides of a thin disk AT-cut quartz. In the late 1950s, Sauerbrey found the relationship between resonant frequency and mass deposit on surface of quartz in gas phase [1],. In the late 1980s, Kanazawa found the QCM oscillate in contact with liquid, the relationship between liquid property (such as viscosity, density) and resonant frequency was founded while immerse one surface of crystal in liquid [2]. If a microliter liquid dropped on the surface of QCM, the Sauerbrey equation and Kanazawa equation may not suitable for the interpretation of the frequency response of QCM. If the frequency response of QCM loaded by liquid droplet could be figured out, the condition that immerse one surface of crystal in liquid could be changed to drop one microliter liquid on surface of crystal, the application of QCM would be extended to more area and it must be more convenient. The results predicted by the theoretical model and obtained by the experiments are compared
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