Download Acoustic Wave Sensors: Theory, Design by D. S. Ballantine Jr., Robert M. White, S. J. Martin, PDF

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

Covers a wide selection of sensors with specialise in analyte-film interactions for numerous physical/chemical absorption procedures. relatively fascinating is the comparability of transients for reversible and irreversible interactions.

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Extra info for Acoustic Wave Sensors: Theory, Design

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Re(Zs) increases more erratically with surface roughness, indicating increased power dissipation by the rough surface. The origin of this increased dissipation is believed to be due to a conversion from plane-parallel liquid flow to surface-normal flow by surface asperities [14]. When the scale of surface roughness is small compared with the liquid decay length 8, roughness has a negligible effect on liquid coupling. In this case, the surface can be considered hydrodynamically smooth [29], contributing a negligible influence on device response.

Thus, the liquid trapping process is apparently being modified by changes in the liquid contact angle. It is reasonable that liquid trapping by concave surface features should depend on the microscopic liquid contact angle. Capillary forces tend to draw a contacting liquid into concave surface features present in a rough surface, such as pits, crevices, or pores. These capillary forces are stronger for hydrophilic (low contact angle) surfaces than for hydrophobic (high contact angle) ones. 12b), the result is qualitatively the same.

In general, perturbations change both energy storage and power dissipation and thus result in a combination of velocity and attenuation changes. The manner in which the propagation of the wave is described is therefore important and will be discussed here briefly. 34 2. 58) v0 or, in normalized form, as [4] A7' = A7 Aa Av - . 59) in which k0 is the unperturbed wavenumber. The latter makes clear that Aa/k and Av/vo are consistently normalized orthogonal components of changes in the complex propagation factor y caused by a generalized perturbation [4].

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