scholarly journals Frequency shifts of quartz crystal units after adjusting frequencies.

1995 ◽  
Vol 7 (1) ◽  
pp. 9-11 ◽  
Author(s):  
Tadahisa SHIONO ◽  
Masahiro SHIBAGAKI
Keyword(s):  
Quartz Crystal ◽  
Frequency Shifts

scholarly journals Improvement QCM Quality By Polystyrene Coating and Bovine Serum Albumin as Immobilization Agent

2019 ◽  
Vol 8 (1) ◽  
pp. 35-41 ◽  
Author(s):  
Lalu A. Didik ◽  
Yahdi Yahdi ◽  
Masruroh Masruroh
Keyword(s):  
Thin Film ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Spin Coating ◽  
Bovine Serum ◽  
Quartz Crystal ◽  
Measuring System ◽  
Frequency Shifts ◽  
Impedance Analyzer ◽  
Coating Method

Polystyrene (PS) thin film with various concentration of mass (1%, 3%, and 5%) has been deposited onto Quartz Crystal Microbalance (QCM)  surface by a spin coating method. The purpose of this research is the improvement of Bovine Serum Albumin (BSA) immobilization into the QCM surface. The QCM resonance frequency has been investigated by means of Impedance Analyzer. The film thickness was calculated by the Sauerbrey equation. The surface roughness of the PS layer was observed by noncontact Topography Measuring System (TMS-1200). Calculation result using a Sauerbrey equation shows the thickness of the PS layer increases with the increasing PS concentration. The QCM/PS with 1% and 5% concentration of mass has rougher morphology and more frequency shifts caused by BSA injection compared to 3% concentration of PS

Effect of Current Distribution on Quartz Crystal Microbalance Measurements

1997 ◽  
Vol 502 ◽  
Author(s):  
James J. Kelly ◽  
Christopher J. Durning ◽  
Alan C. West
Keyword(s):  
Quartz Crystal Microbalance ◽  
Current Distribution ◽  
Quartz Crystal ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Sensitivity Factor ◽  
A Posteriori ◽  
Frequency Shifts ◽  
Point To Point ◽  
Measured Mass

ABSTRACTSpatially nonuniform electrodeposition can cause discrepancies between predicted and experimentally measured mass loadings on an electrochemical quartz crystal microbalance (EQCM) since the sensitivity of the quartz crystal varies significantly from point to point. These discrepancies can be significant even if the current distribution is nearly uniform. These effects were examined experimentally by varying the conductivity of the electrolyte and the current density during the electrodeposition of copper on an EQCM, effecting changes in the spatial, deposited-mass distribution in a controlled manner. The resulting frequency shifts are in agreement with results predicted by current distribution simulations, validated a posteriori with profilometry measurements. Our results permit determination of the spatial variation of the quartz crystal sensitivity factor or of the current distribution on the EQCM.

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.

Deliquescence Phase Transition Measurements by Quartz Crystal Microbalance Frequency Shifts

2012 ◽  
Vol 116 (29) ◽  
pp. 7658-7667 ◽  
Author(s):  
Kathleen Jane L. Arenas ◽  
Steven R. Schill ◽  
Ammaji Malla ◽  
Paula K. Hudson
Keyword(s):  
Phase Transition ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Frequency Shifts

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.

Positive Frequency Shifts Observed Upon Adsorbing Micron-Sized Solid Objects to a Quartz Crystal Microbalance from the Liquid Phase

2010 ◽  
Vol 82 (6) ◽  
pp. 2237-2242 ◽  
Author(s):  
Agata Pomorska ◽  
Dmitry Shchukin ◽  
Richard Hammond ◽  
Matthew A. Cooper ◽  
Guido Grundmeier ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Frequency Shifts ◽  
Solid Objects ◽  
Positive Frequency

scholarly journals Pocket Mercury-Vapour Detection System Employing a Preconcentrator Based on Au-TiO2 Nanomaterials

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8255
Author(s):  
Emiliano Zampetti ◽  
Paolo Papa ◽  
Andrea Bearzotti ◽  
Antonella Macagnano
Keyword(s):  
Quartz Crystal ◽  
Limit Of Detection ◽  
Detection System ◽  
Low Cost ◽  
Fast Response ◽  
Mercury Vapour ◽  
Detection Capability ◽  
Frequency Shifts ◽  
Tio2 Nanomaterials ◽  
Sampling Times

In environments polluted by mercury vapors that are potentially harmful to human health, there is a need to perform rapid surveys in order to promptly identify the sources of emission. With this aim, in this work, a low cost, pocket-sized portable mercury measurement system, with a fast response signal is presented. It consists of a preconcentrator, able to adsorb and subsequently release the mercury vapour detected by a quartz crystal microbalance (QCM) sensor. The preconcentrator is based on an adsorbing layer of titania/gold nanoparticles (TiO2NP/AuNPs), deposited on a micro-heater that acts as mercury thermal desorption. For the detection of the released mercury vapour, gold electrodes QCM (20 MHz) have been used. The experimental results, performed in simulated polluted mercury-vapour environments, showed a detection capability with a prompt response. In particular, frequency shifts (−118 Hz ± 2 Hz and −30 Hz ± 2 Hz) were detected at concentrations of 65 µg/m3 Hg0 and 30 µg/m3 Hg0, with sampling times of 60 min and 30 min, respectively. A system limit of detection (LOD) of 5 µg/m3 was evaluated for the 30 min sampling time.

Sign in / Sign up

Export Citation Format

Share Document