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Using quartz crystal microbalances to simultaneously sense mass accumulation and solution properties [Book Chapter]

Conference · · TRANSDUCERS '91: 1991 International Conference on Solid-State Sensors and Actuators. Digest of Technical Papers
 [1];  [1];  [1];  [1]
  1. Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
A lumped-element equivalent circuit model is presented that describes the near resonance electrical characteristics of a quartz crystal microbalance (QCM) simultaneously loaded by a surface mass layer and a contacting liquid. The model was derived by solving the boundary-value problem for coupled mechanical displacement and electrical potential; this results in circuit elements that are explicitly related to physical properties of the quartz, the perturbing mass layer, and the contacting liquid. The effects of mass and/or liquid loading on the admittance-vs.-frequency behavior 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 damping of the resonance peak. Using the model, changes in surface mass can be differentiated from changes in solution properties.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC04-76DP00789
OSTI ID:
5883194
Report Number(s):
SAND--91-0064C; CONF-9106116--4; ON: DE91011501; ISBN: 0-87942-585-7
Conference Information:
Journal Name: TRANSDUCERS '91: 1991 International Conference on Solid-State Sensors and Actuators. Digest of Technical Papers
Country of Publication:
United States
Language:
English

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