scholarly journals Using Quartz Crystal Microbalance for Field Measurement of Liquid Viscosities

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Qingsong Bai ◽  
Xianhe Huang
Keyword(s):  
Field Measurement ◽  
Quartz Crystal ◽  
Newtonian Liquid ◽  
Viscous Damping ◽  
Frequency Shifts ◽  
Viscous Liquids ◽  
Sensor Applications ◽  
Potential Applications ◽  
Quartz Crystal Microbalances ◽  
Large Frequency

The field measurement of liquid viscosities, especially the high viscous liquids, is challenging and often requires expensive equipment, long processing time, and lots of reagent. We use quartz crystal microbalances (QCMs) operating in solution which are also sensitive to the viscosity and density of the contacting solution. QCMs are typically investigated for sensor applications in which one surface of QCM completely immersed in Newtonian liquid, but the viscous damping in liquids would cause not only large frequency shifts but also large losses in the quality factorQleading to instability and even cessation of oscillation. A novel mass-sensitivity-based method for field measurement of liquid viscosities using a QCM is demonstrated in this paper and a model describing the influence of the liquid properties on the oscillation frequency is established as well. Two groups of verified experiments were performed and the experimental results show that the presented method is effective and possesses potential applications.

Study of Frequency Response of Quartz Crystal Microbalance to Different Wetting States of Micropillar Surfaces

2017 ◽  
Author(s):  
Junwei Su ◽  
Hamed Esmaeilzadeh ◽  
Hongwei Sun
Keyword(s):  
Quartz Crystal Microbalance ◽  
Nanoimprint Lithography ◽  
Quartz Crystal ◽  
Beam Theory ◽  
Frequency Shifts ◽  
Highly Nonlinear ◽  
Wide Range ◽  
Theoretical Predictions ◽  
Potential Applications ◽  
Order Of Magnitude

Enhanced wettability, known as superhydrophobicity or superhydrophilicity has drawn extensive attention in the past for wide range potential applications such as superhydrophobic surfaces for self-cleaning, anti-icing, dropwise condensation, and drag reduction. This research focuses on the investigation of the frequency responses of quartz crystal microbalance (QCM) devices coated with micropillars to the different wetting states of drops. A theoretical model was developed to correlate the resonant frequency shifts of QCMs with the penetrated (Wenzel state) and suspended (Cassie state) states based on the Euler-Bernoulli beam theory. In the experimental validation of the theory, Poly(methyl methacrylate) (PMMA) micropillars were fabricated on the QCMs using nanoimprint lithography (NIL) method and the different wetting states were generated by plasma treatment and chemical coating. The frequency shifts of the QCM device were measured by a network analyzer. A good agreement between experimental measurements and theoretical predictions was obtained. It was found that the micropillars operating in the penetrated state results in one order of magnitude higher frequency shift of QCM than the micropillars in suspended state. There exists a highly nonlinear vibrating behavior of micropillars with different heights in both penetrated and suspended states. The QCM based technology is a valuable tool for studying the wettability of different superhydrophobic or superhydrophilic surfaces.

scholarly journals Low-cost, in-liquid measuring system using a novel compact oscillation circuit and quartz-crystal microbalances (QCMs) as a versatile biosensor platform

2017 ◽  
Vol 6 (2) ◽  
pp. 341-350 ◽  
Author(s):  
Stefan Beißner ◽  
Jan-Wilhelm Thies ◽  
Christopher Bechthold ◽  
Philipp Kuhn ◽  
Bettina Thürmann ◽  
...  
Keyword(s):  
Quartz Crystal ◽  
Low Cost ◽  
Measuring System ◽  
Viscous Damping ◽  
Surface Binding ◽  
Colpitts Oscillator ◽  
Mass Sensors ◽  
Oscillation Circuit ◽  
Custom Made ◽  
Quartz Crystal Microbalances

Abstract. Quartz-crystal microbalances (QCMs) are commercially available mass sensors which mainly consist of a quartz resonator that oscillates at a characteristic frequency, which shifts when mass changes due to surface binding of molecules. In addition to mass changes, the viscosity of gases or liquids in contact with the sensor also shifts the resonance but also influences the quality factor (Q-factor). Typical biosensor applications demand operation in liquid environments leading to viscous damping strongly lowering Q-factors. For obtaining reliable measurements in liquid environments, excellent resonator control and signal processing are essential but standard resonator circuits like the Pierce and Colpitts oscillator fail to establish stable resonances. Here we present a low-cost, compact and robust oscillator circuit comprising of state-of-the-art commercially available surface-mount technology components which stimulates the QCMs oscillation, while it also establishes a control loop regulating the applied voltage. Thereby an increased energy dissipation by strong viscous damping in liquid solutions can be compensated and oscillations are stabilized. The presented circuit is suitable to be used in compact biosensor systems using custom-made miniaturized QCMs in microfluidic environments. As a proof of concept we used this circuit in combination with a customized microfabricated QCM in a microfluidic environment to measure the concentration of C-reactive protein (CRP) in buffer (PBS) down to concentrations as low as 5 µg mL−1.

Surface Pretreatment Boosts the Performance of Supramolecular Affinity Materials on Quartz Crystal Microbalances for Sensor Applications

2013 ◽  
Vol 85 (21) ◽  
pp. 10526-10530 ◽  
Author(s):  
Malte Brutschy ◽  
Daniel Lubczyk ◽  
Klaus Müllen ◽  
Siegfried R. Waldvogel
Keyword(s):  
Quartz Crystal ◽  
Surface Pretreatment ◽  
Sensor Applications ◽  
Quartz Crystal Microbalances

scholarly journals Sodium, Silver and Lithium-Ion Conducting β″-Alumina + YSZ Composites, Ionic Conductivity and Stability

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 293
Author(s):  
Liangzhu Zhu ◽  
Anil V. Virkar
Keyword(s):  
Ion Exchange ◽  
Electrochemical Impedance ◽  
Ionic Conductivities ◽  
Lithium Ion ◽  
Co2 Corrosion ◽  
Ionic Conductors ◽  
Ion Conductor ◽  
Sensor Applications ◽  
Potential Applications ◽  
Ion Conducting

Na-β″-alumina (Na2O.~6Al2O3) is known to be an excellent sodium ion conductor in battery and sensor applications. In this study we report fabrication of Na- β″-alumina + YSZ dual phase composite to mitigate moisture and CO2 corrosion that otherwise can lead to degradation in pure Na-β″-alumina conductor. Subsequently, we heat-treated the samples in molten AgNO3 and LiNO3 to respectively form Ag-β″-alumina + YSZ and Li-β″-alumina + YSZ to investigate their potential applications in silver- and lithium-ion solid state batteries. Ion exchange fronts were captured via SEM and EDS techniques. Their ionic conductivities were measured using electrochemical impedance spectroscopy. Both ion exchange rates and ionic conductivities of these composite ionic conductors were firstly reported here and measured as a function of ion exchange time and temperature.

Quartz Crystal Microbalances Functionalized with Citric Acid-Doped Polyvinyl Acetate Nanofibers for Ammonia Sensing

2020 ◽  
Vol 3 (6) ◽  
pp. 5687-5697 ◽  
Author(s):  
Roto Roto ◽  
Aditya Rianjanu ◽  
Annisa Rahmawati ◽  
Innas Amaliya Fatyadi ◽  
Nursidik Yulianto ◽  
...  
Keyword(s):  
Citric Acid ◽  
Quartz Crystal ◽  
Polyvinyl Acetate ◽  
Ammonia Sensing ◽  
Quartz Crystal Microbalances

Design of 3D printed holder for quartz crystal microbalances

2021 ◽  
Author(s):  
Diego Scaccabarozzi ◽  
Bortolino Saggin ◽  
Marianna Magni ◽  
Pietro Valnegri ◽  
Marco Giovanni Corti ◽  
...  
Keyword(s):  
Quartz Crystal ◽  
Quartz Crystal Microbalances ◽  
3D Printed
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