Results 211 to 220 of about 39,102 (256)
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Development of a magnetic quartz crystal microbalance
Review of Scientific Instruments, 2007A new technique for measurement of magnetic properties of materials is demonstrated. It can be used for the measurement of thin magnetic films during their chemical modification. The resonance frequency of a quartz crystal microbalance (QCM) with conducting polymer (polyaniline) suspension in poly(ethylene glycol) was observed to increase with ...
George Y, Yu +3 more
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ATS-6 Quartz-Crystal Microbalance
IEEE Transactions on Aerospace and Electronic Systems, 1975The Quartz-Crystal Microbalance Experiment provided data on the possible return of contaminants to the exterior surfaces of the spacecraft. The experiment measures the change in resonant frequency of the crystal due to deposition of material on the surface.
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Quartz Crystal Microbalances for Microscale Thermogravimetric Analysis
Analytical Chemistry, 2010A new method for analyzing the chemical purity and consistency of microscale samples with a quartz crystal microbalance (QCM) sensor platform is described. The QCM is used to monitor submicrogram changes in the mass of a deposited thin film as a function of temperature, in a manner similar to that of a conventional thermogravimetric analyzer (TGA ...
Elisabeth, Mansfield +3 more
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Electrochemical Quartz Crystal Microbalance Technique in Sonoelectrochemistry
ECS Transactions, 2009The influence of the experimental conditions on the operation of a quartz crystal microbalance in an ultrasonic field was studied in water and different Cu electrolytes. An increase of the ultrasonic intensity and a decreasing distance between the ultrasonic horn tip and the surface of the quartz resonator caused an increase in signal noise and a ...
Oliver Schneider +2 more
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Quartz Crystal Microbalance Technique for Analysis of Cooling Crystallization
Analytical Chemistry, 2013A quartz crystal microbalance (QCM) technique is developed for the in situ analysis of the cooling crystallization processes of crystal nucleation and growth. In contrast to conventional techniques based on property changes in the solid or solution phase, the proposed QCM technique simultaneously exploits property changes in both the solid and solution
Li-Shang, Liu +4 more
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Improved quartz crystal microbalance technique
Journal of Applied Physics, 1984The importance of using the most pertinent mathematical description of the mass load versus frequency relation for quartz crystal thin-film thickness monitors is reviewed. The different usable crystal load ranges of the so-called frequency- and period-measurement techniques in comparison with the Z-Match technique are calculated for most of the ...
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Probing Protein Aggregation with Quartz Crystal Microbalances
2011The supra-molecular self-assembly of peptides and proteins is a process which underlies a range of normal and aberrant biological pathways in nature, but one which remains challenging to monitor in a quantitative way. We discuss the experimental details of an approach to this problem which involves the direct measurement in vitro of mass changes of the
Tuomas P J, Knowles +3 more
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Quartz Crystal Microbalances: Chemical Applications
2016In 1959, Sauerbrey introduced a new type of resonator, which shifts its resonance frequency in response to deposited mass on its surface. In this way, a new type of mass-sensitive sensor was developed named as quartz crystal microbalance (QCM). It is a type of piezoelectric sensor, which enables sensitive, selective, and label-free detection of ...
Dickert, Franz, Latif, Usman
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The Quartz Crystal Microbalance as a Nanotribology Technique
2007The quartz crystal microbalance (QCM) technique is a powerful probe of interfacial phenomena that has been successfully employed to investigate the sliding friction of objects of nanoscopic size subject to lateral speeds as large as a few m/s. After a description of the quartz acoustics, the chapter presents the more common circuits used to drive the ...
BRUSCHI L, MISTURA, GIAMPAOLO
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Quartz Crystal Microbalance - QCM
2009The Quartz Crystal Microbalance (QCM) technique determines mass density and viscoelastic properties of a system in contact with a quartz sensor by measuring the characteristic impedance of the acoustic resonator. The measured quantities are either the complete impedance structure or the resonance frequency and a parameter associated with damping, e.g ...
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