scholarly journals Compressional-Wave Effects in the Operation of a Quartz Crystal Microbalance in Liquids:Dependence on Overtone Order

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2535
Author(s):  
Robert Kowarsch ◽  
Yuriy Suhak ◽  
Lucia Cortina Eduarte ◽  
Mohammad Mansour ◽  
Frederick Meyer ◽  
...  
Keyword(s):  
Quartz Crystal Microbalance ◽  
Fundamental Mode ◽  
Quartz Crystal ◽  
Compressional Wave ◽  
Transverse Motion ◽  
Compressional Waves ◽  
Small Load ◽  
Wave Effects ◽  
Planar Wall ◽  
Thickness Shear

The operation of the quartz crystal microbalance (QCM) in liquids is plagued by small flexural admixtures to the thickness-shear deformation. The resonator surface moves not only in the transverse direction, but also along the surface normal, thereby emitting compressional waves into the liquid. Using a simple analytical model and laser Doppler vibrometry, we show that the flexural admixtures are stronger on the fundamental mode than on the overtones. The normal amplitude of motion amounts to about 1% of the transverse motion on the fundamental mode. This ratio drops by a factor of two on the overtones. A similar dependence on overtone order is observed in experiments, where the resonator is immersed in a liquid and faces an opposite planar wall, the distance of which varies. Standing compressional waves occur at certain distances. The amplitudes of these are smaller on the overtones than on the fundamental mode. The findings can be rationalized with the tensor form of the small-load approximation.

Analysis and Improvement of the Mass Sensitivity for Piezoelectric Immunosensor

2013 ◽  
Vol 378 ◽  
pp. 435-439
Author(s):  
Yan Chen ◽  
Xian He Huang ◽  
Hua Shan Shi ◽  
Hong Chen
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Amplitude Equation ◽  
Maximum Mass ◽  
Vibration Displacement ◽  
Mass Sensitivity ◽  
Surface Electrodes ◽  
Sensitivity Distribution ◽  
Piezoelectric Immunosensor ◽  
Thickness Shear

The objective of this study was to improve the low repeatability in quartz crystal microbalance (QCM) measurements. The constitutive equations for the thickness-shear vibrations of an AT-cut quartz crystal with surface electrodes were used to obtain the particle vibration displacement amplitude equation. Then the mass sensitivity of piezoelectric immunosensor was analyzed and the approach to improve low repeatability was proposed. A 10MHz modified-electrode AT-cut QCM with a maximum mass sensitivity of was designed to verify uniform mass sensitivity distribution in the fully electrode region. Analysis results show that in order to improve the accuracy in QCM immunosensor measurements, it is feasible to improve its mass sensitivity.

scholarly journals Simulation of electrical properties of quartz crystal microbalance using multi-resonance thickness-shear mode technique

2016 ◽  
Vol 19 (4) ◽  
pp. 194-206
Author(s):  
Thu Thi Minh Tran ◽  
Thong Huy Tran ◽  
Phuoc Tan Duong ◽  
Thanh Vo Ke Ngo ◽  
Giang Dang Nguyen ◽  
...  
Keyword(s):  
Thin Film ◽  
Penetration Depth ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Shear Mode ◽  
Thickness Shear Mode ◽  
Harmonic Operation ◽  
Deposition Processes ◽  
Mode Technique ◽  
Thickness Shear

The use of quartz crystal microbalance (QCM) in chemistry, biophysics, microbiology and electronics has grown tremendously in recent years. In this paper, the properties of a QCM sensor (a system include QCM device and viscoelastic medium) operating in the range of 5 MHz to 35 MHz of Multi-resonance Thickness-Shear Mode (MTSM, n = 1, 3, 5, 7) are described. We calculate the changes both in resonant frequencies and attenuation of the QCM. The penetration depth of the shear waves propagating from quartz into loaded thin film varies in different values due to the harmonics, from which we infer the properties of the loaded thin film. The multi-harmonic operation of QCM was presented to collect the information of the loaded thin film on QCM’s electrode. This enables a “virtual slicing technique” because a harmonic relates to a different penetration depth even with the same material. The theoretical analysis of MTSM has been developed to model and simulate the signature of the sensor responses at harmonic frequencies. The signatures of the evaporation- induced deposition processes were investigated by studying the effect of the thickness and stiffness of the medium.

scholarly journals Studying Soft Interfaces with Shear Waves: Principles and Applications of the Quartz Crystal Microbalance (QCM)

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3490
Author(s):  
Diethelm Johannsmann ◽  
Arne Langhoff ◽  
Christian Leppin
Keyword(s):  
Resonance Frequency ◽  
Quartz Crystal Microbalance ◽  
High Frequency ◽  
Quartz Crystal ◽  
Contact Stiffness ◽  
Nonlinear Effects ◽  
Partial Slip ◽  
Soft Interfaces ◽  
Small Load ◽  
Planar Films

The response of the quartz crystal microbalance (QCM, also: QCM-D for “QCM with Dissipation monitoring”) to loading with a diverse set of samples is reviewed in a consistent frame. After a brief introduction to the advanced QCMs, the governing equation (the small-load approximation) is derived. Planar films and adsorbates are modeled based on the acoustic multilayer formalism. In liquid environments, viscoelastic spectroscopy and high-frequency rheology are possible, even on layers with a thickness in the monolayer range. For particulate samples, the contact stiffness can be derived. Because the stress at the contact is large, the force is not always proportional to the displacement. Nonlinear effects are observed, leading to a dependence of the resonance frequency and the resonance bandwidth on the amplitude of oscillation. Partial slip, in particular, can be studied in detail. Advanced topics include structured samples and the extension of the small-load approximation to its tensorial version.

Interaction of Clear Flavor Emulsions Containing Lemon Essential Oils with Lipid Bilayers via a Quartz Crystal Microbalance

2019 ◽  
Vol 25 (6) ◽  
pp. 879-884
Author(s):  
Takahiro Sakai ◽  
Hayato Seki ◽  
Shogo Yoshida ◽  
Hayato Hori ◽  
Hisashi Suzuki ◽  
...  
Keyword(s):  
Essential Oils ◽  
Lipid Bilayers ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal
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