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 A preliminary study of identification halal gelatin using Quartz Crystal Microbalance (QCM) sensor

2018 ◽  
Vol 14 (3) ◽  
pp. 325-330 ◽  
Author(s):  
Diwasasri Pradini ◽  
Hendro Juwono ◽  
Kartika Anoraga Madurani ◽  
Fredy Kurniawan
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Layer By Layer ◽  
Effective Technique ◽  
Frequency Shifts ◽  
Halal Food ◽  
Preliminary Study ◽  
Bovine Gelatin ◽  
Study Performance ◽  
Positive Frequency

Gelatin has been widely used as an additive in pharmaceutical, cosmetic, and food industry. The similar physical appearance between bovine and porcine gelatin causes an issue for some communities like a Muslim due to awareness of halal food. A Muslim community consider porcine gelatin is non-halal material which must be avoided. So there is a demand to distinguish and labeling the origin source of the gelatin in any products. In turn, it lead to development of  a method to identify the source of gelatin. In this study, performance of a modified Quartz Crystal Microbalance (QCM) sensor to identify halal gelatin has been investigated. A QCM sensor was modified by depositing polyaniline/nickel compound on the surface of gold electrode QCM carried out by Layer by Layer (LbL) deposition technique. Bovine and porcine gelatin were measured in demineralized water at pH 9. This modified QCM sensor shows good frequency response to distinguish bovine and porcine gelatin. The measurements gave a negative frequency shifts for bovine gelatin and a positive frequency shifts for porcine gelatin. The modified QCM sensor also worked well in the real sample. This indicates that a modified QCM sensor is very useful and effective technique to distinguish bovine gelatin (halal) from porcine gelatin (non-halal).

scholarly journals Cell spreading on quartz crystal microbalance elicits positive frequency shifts indicative of viscosity changes

2003 ◽  
Vol 377 (3) ◽  
pp. 578-586 ◽  
Author(s):  
Carine Galli Marxer ◽  
Martine Collaud Coen ◽  
Thomas Greber ◽  
Urs F. Greber ◽  
Louis Schlapbach
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Cell Spreading ◽  
Frequency Shifts ◽  
Viscosity Changes ◽  
Positive Frequency

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.

Monitoring the growth of titanium oxide thin films by the liquid-phase deposition method with a quartz crystal microbalance

1997 ◽  
Vol 7 (5) ◽  
pp. 733-736 ◽  
Author(s):  
Shigehito Deki ◽  
Yoshifumi Aoi ◽  
Yasuhiro Asaoka ◽  
Akihiko Kajinami ◽  
Minoru Mizuhata
Keyword(s):  
Thin Films ◽  
Liquid Phase ◽  
Titanium Oxide ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Liquid Phase Deposition ◽  
Deposition Method ◽  
Oxide Thin Films
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