Limitations
The Sauerbrey equation was developed for oscillation in air and only applies to rigid masses attached to the crystal. It has been shown that quartz crystal microbalance measurements can be performed in liquid, in which case a viscosity related decrease in the resonant frequency will be observed:
where is the density of the liquid and is the viscosity of the liquid (Kanazawa and Gordon 1985).
Read more about this topic: Sauerbrey Equation
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