Transmission-line model for immersed quartz-crystal sensors

Filiâtre, C.; Bardèche, G.; Valentin, M.

doi:10.1016/0924-4247(94)00796-9

Cited by 35 publications

(12 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[30][31][32][33][34] In most cases, the behaviour of the quartz crystal is described with lumped elements the values of which are obtained by transforming the transmission line theory into the Butterworth-van Dyke (BvD) equivalent circuit model. In practice, a QCM piezoelectric element consists of a loaded and an unloaded (ܼ ௦ = 0) faces, and the total motional impedance Z m is a sum of these two:…”

Section: Viscoelastic Modelling In Qcmmentioning

confidence: 99%

Detection of Phase Transition in Photosensitive Liposomes by Advanced QCM

et al. 2015

View full text Add to dashboard Cite

In this work an impedance-based quartz crystal microbalance (QCM) is used to detect heat induced changes in the viscoelastic properties in the films of adsorbed liposomes. Liposomes are bound to a polymer-modified QCM surface, and heat is induced in the bilayer via light absorption into gold nanoparticles (GNPs) embedded in the liposomes. Due to very rapid heat transfer at the nanoscale, nanoparticles can reside either in the liposome cavity or within the bilayer to cause changes in the lipid viscoelasticity. The changes are observed as changes in the film relaxation time as well as by mapping the measured resonance frequency vs. resistance. The QCM results indicate that viscoelastic changes occur throughout the vesicle layer, possibly causing fusion between the liposomes. The ultimate goal of the work is to develop a smart drug delivery system for the eye, whereby a drug loaded in the liposome can be released in a controlled manner by light triggering.

show abstract

Section: Viscoelastic Modelling In Qcmmentioning

confidence: 99%

Detection of Phase Transition in Photosensitive Liposomes by Advanced QCM

et al. 2015

View full text Add to dashboard Cite

show abstract

“…With the parallel capacitance C 0 , which ascribes for the dielectric quartz between the electrodes, one obtains the well-established Butterworth−van Dyke (BVD) equivalent circuit (cf. Figure ), which is a limiting case of the more rigorous transmission-line model. , From these electrical elements the typical resonator characteristics such as the resonance frequency as well as the quality factor Q = 2π f R L m / R m can be calculated…”

Section: Theorymentioning

confidence: 99%

Viscoelastic Properties of Low-Viscosity Liquids Studied with Thickness-Shear Mode Resonators

Bund

Schwitzgebel

1998

Anal. Chem.

View full text Add to dashboard Cite

The network analysis method was applied to AT cut quartz blanks (f(0) = 10 MHz), which were loaded with liquids of low and medium viscosity (water, methanol, ethanol, 1-propanol, 1-butanol, glycerol solutions). The shift of the resonance frequency Δf could be separated into a term due to rigidly coupled mass Δf(rig) and a term due to viscous damping Δf - Δf(rig). From the difference Δf - Δf(rig) and the broadening of the resonance curve, the complex shear modulus G = G' + iωη(L) was calculated. The viscosity coefficients η(L) are in good agreement with literature data. As G' > 0, it can be concluded that the examined fluids also reveal elasticity at shear frequencies in the MHz range. For the low-viscosity liquids, elastic contributions resulting from collective interactions of molecules are measurable but small and neglectable in most applications. The medium viscous liquid glycerol (98%) begins to exhibit considerable elasticity, resulting from the relaxation of separate molecules.

show abstract

“…In the present paper, we analyze the effect of mass accumulation and the effect of film modulus or film-modulus changes for the response of acoustic-wave-based chemical sensors, on the basis of a model for acoustic wave propagation, which does not include any thin-film approximation. It is not our intention to introduce the model; it can be found in several papers. ,,,− We only discuss some major aspects that are necessary to understand the general mechanism of the viscoelastic influence on the electrical response of acoustic wave sensors. We present and discuss calculation results, which cover a broad range of polymer properties, and derive an indicator, which can help the experimenter to estimate gravimetric and nongravimetric contributions to his sensor signal without further investigations.…”

mentioning

confidence: 99%

“…It is not our intention to introduce the model; it can be found in several papers. 4,10,14,[27][28][29] We only discuss some major aspects that are necessary to understand the general mechanism of the viscoelastic influence on the electrical response of acoustic wave sensors. We present and discuss calculation results, which cover a broad range of polymer properties, and derive an indicator, which can help the experimenter to estimate gravimetric and nongravimetric contributions to his sensor signal without further investigations.…”

mentioning

confidence: 99%

Role of Mass Accumulation and Viscoelastic Film Properties for the Response of Acoustic-Wave-Based Chemical Sensors

1999

View full text Add to dashboard Cite

The sensitivity of acoustic-wave microsensors coated with a viscoelastic film to mass changes and film modulus (changes) is examined. The study analyzes the acoustic load at the interface between the acoustic device and the coating. The acoustic load carries information about surface mass and film modulus; its determination has no restrictions in film thickness. Two regimes of film behavior can be distinguished: the gravimetric regime, where the sensor response is mainly mass sensitive, and the nongravimetric regime, where viscoelasticity gains influence on the sensor response. We develop a method, which allows the assignment of the sensor signal to a gravimetric or a nongravimetric response. The critical value can be determined from oscillator measurements. The related limits for the coating thickness are not the same for the coating procedure and mass accumulation during chemical sensing. As an example, we present results from a 10 MHz quartz crystal resonator.

show abstract

Transmission-line model for immersed quartz-crystal sensors

Cited by 35 publications

References 14 publications

Detection of Phase Transition in Photosensitive Liposomes by Advanced QCM

Detection of Phase Transition in Photosensitive Liposomes by Advanced QCM

Viscoelastic Properties of Low-Viscosity Liquids Studied with Thickness-Shear Mode Resonators

Role of Mass Accumulation and Viscoelastic Film Properties for the Response of Acoustic-Wave-Based Chemical Sensors

Contact Info

Product

Resources

About