By D. S. Ballantine Jr., Robert M. White, S. J. Martin, Antonio J. Ricco, E. T. Zellers, G. C. Frye, H. Wohltjen, Moises Levy, Richard Stern
ISBN-10: 0120774607
ISBN-13: 9780120774609
Covers a large choice of sensors with specialise in analyte-film interactions for numerous physical/chemical absorption techniques. really fascinating is the comparability of transients for reversible and irreversible interactions.
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Extra resources for Acoustic Wave Sensors: Theory, Design
Example text
__ - -- J - - - -- - - - - . 12 Cross-section of a liquid meniscus formed as liquid penetrates into a sinusoidally-textured surface, illustrating contact angle-dependent trapping [14]: (a) with trapped air, and (b) without trapped air. The dashed lines indicate the initial (nonequilibrium) penetration of liquid for the indicated microscopic contact angle. The solid lines indicate the equilibrium penetration, becoming complete for 0 < 108 ~ (upper) or 0 < 117 ~ (lower). (Reprinted with permission.
1 Hz, calculate the limit of mass resolution. 9, S = dfldps = -fol(pqh) = -57 Hz-cm2/~g. This means that for each 1/zg/cm 2 of mass accumulation, the resonant frequency will decrease by 57 Hz. 3 Hz)/(57 Hzcm2//zg) = 5 ng/cm 2. The high mass sensitivity calculated in the previous example justifies the term "microbalance" in describing the sensing capabilities of the quartz resonator. 9 can be used to calculate frequency shifts for surface accumulations that behave as ideal mass layers. A real film behaves as an ideal mass layer if it is sufficiently thin and rigid so that it moves synchronously with the oscillating device surface.
A textured surface, with either random roughness or lithographically defined features, exhibits an enhanced interaction with a contacting fluid. This is evidenced by an increase in motional resistance (R2) and inductance (L2) measured upon liquid contact. Schumacher [25] and Beck et al. [26] have identified one source of this increased solid-liquid interaction: vertical features on the surface constrain or "trap" a quantity of fluid (in excess of that viscously coupled), forcing it to move synchronously with the oscillating surface.
Acoustic Wave Sensors: Theory, Design by D. S. Ballantine Jr., Robert M. White, S. J. Martin, Antonio J. Ricco, E. T. Zellers, G. C. Frye, H. Wohltjen, Moises Levy, Richard Stern
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