Using quartz crystal microbalances to simultaneously sense mass accumulation and solution properties

Conference · Tue Jan 01 00:00:00 EST 1991

OSTI ID:5883194

Martin, S J; Granstaff, V E; Frye, G C; Ricco, A J

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. 15 refs., 5 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5883194
• Report Number(s): SAND-91-0064C; CONF-9106116-4; ON: DE91011501
• Resource Relation: Conference: Transducers 91 conference, San Francisco, CA (USA), 23-27 Jun 1991
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
47 OTHER INSTRUMENTATION
MICROBALANCES
CALIBRATION
TESTING
MATHEMATICAL MODELS
MEASURING METHODS
QUARTZ
RESONANCE
SOLUTIONS
TIME DEPENDENCE
BALANCES
CHALCOGENIDES
DISPERSIONS
MEASURING INSTRUMENTS
MINERALS
MIXTURES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
WEIGHT INDICATORS
400100* - Analytical & Separations Chemistry
440800 - Miscellaneous Instrumentation- (1990-)