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Quartz crystal microbalance setup for frequency and G!?-factor rneasurements in gaseous and liquid environments
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In this paper, an experimental setup has been constructed for simultaneous measurements of the frequency, the absolute Q factor, and the amplitude of oscillation of a quartz crystal microbalance (QCM).Abstract:
An experimental setup has been constructed for simultaneous measurements of the frequency, the absolute Q factor, and the amplitude of oscillation of a quartz crystal microbalance (QCM). The technical solution allows operation in vacuum, air, or liquid. The crystal is driven at its resonant frequency by an oscillator that can be intermittently disconnected causing the crystal oscillation amplitude to decay exponentially. From the recorded decay curve the absolute Q factor (calculated from the decay time constant), the frequency of the freely oscillating crystal, and the amplitude of oscillation are obtained. AI1 measurements are fully automated. One electrode of the QCM in our setup was connected to true ground which makes possible simultaneous electrochemistry. The performance is illustrated by experiments in fluids of varying viscosity (gas and liquid) and by protein adsorption in situ. We found, in addition to the above results, that the amplitude of oscillation is not always directly proportional to the Q factor, as the commonly used theory states. This puts limitations on the customary use of the amplitude of oscillation as a measure of the Q factor. 8 1995 American Institute of Physics.read more
Citations
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Journal ArticleDOI
Surface specific kinetics of lipid vesicle adsorption measured with a quartz crystal microbalance.
C.A. Keller,Bengt Herbert Kasemo +1 more
TL;DR: This work measures the kinetics of adsorption of small (12.5-nm radius) unilamellar vesicles onto SiO2, oxidized gold, and a self-assembled monolayer of methyl-terminated thiols, using a quartz crystal microbalance (QCM).
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Hearing what you cannot see and visualizing what you hear: interpreting quartz crystal microbalance data from solvated interfaces.
TL;DR: QCM users are offered a set of guidelines for interpretation and quantitative analysis of QCM data based on a synthesis of well-established concepts rooted in rheological research of the last century and of new results obtained in the last several years.
Journal ArticleDOI
Simultaneous frequency and dissipation factor QCM measurements of biomolecular adsorption and cell adhesion
Michael Rodahl,Fredrik Höök,Claes Fredriksson,Craig A. Keller,Anatol Krozer,Peter Brzezinski,M. V. Voinova,Bengt Herbert Kasemo +7 more
TL;DR: It is shown theoretically that viscoelastic layers with thicknesses comparable to the biofilms studied in this work can induce energy dissipation of the same magnitude as the measured ones.
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Critical review on biofilm methods
Joana Azeredo,Nuno F. Azevedo,Romain Briandet,Nuno Cerca,Tom Coenye,Ana Rita Costa,Mickaël Desvaux,Giovanni Di Bonaventura,Michel Hébraud,Zoran Jaglic,Miroslava Kačániová,Susanne Knøchel,Anália Lourenço,Filipe Mergulhão,Rikke Louise Meyer,George Nychas,Manuel Simões,Odile Tresse,Claus Sternberg +18 more
TL;DR: This review aims at helping scientists in finding the most appropriate and up-to-date methods to study their biofilms by giving a critical perspective, highlighting the advantages and limitations of several methods.
Journal ArticleDOI
A comparative study of protein adsorption on titanium oxide surfaces using in situ ellipsometry, optical waveguide lightmode spectroscopy, and quartz crystal microbalance/dissipation
Fredrik Höök,Janos Vörös,M. Rodahl,R. Kurrat,Peter Böni,Jeremy J. Ramsden,Marcus Textor,Nicholas D. Spencer,Pentti Tengvall,J. Gold,Bengt Herbert Kasemo +10 more
TL;DR: In this article, the adsorption kinetics of three model proteins (human serum albumin, fibrinogen and hemoglobin) were measured and compared using three different experimental techniques: optical waveguide lightmode spectroscopy (OWLS), ellipsometry (ELM) and quartz crystal microbalance (QCM-D).
References
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Frequency of a quartz microbalance in contact with liquid
Journal ArticleDOI
Study of the Superfluid Transition in Two-Dimensional He 4 Films
David J. Bishop,John D. Reppy +1 more
TL;DR: In this article, the authors studied the superfluid transition of a thin two-dimensional helium film adsorbed on an oscillating substrate and analyzed its mass and dissipation in terms of dynamic theory.