Quartz Crystal Microbalance Digital Controller

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14 Getting Started Chapter 1SpecificationsFlow Volume (crystal chamber) ~ 0.15 mLIn/Out PortsBarbed hose adapters for 1/16” ID tubing,with 0.040” ID thru-hole.(Model P-663 from www.upchurch.com)Recommended flow rate
Theory, Operation and Calibration 15Chapter 2Theory, Operation and CalibrationThis chapter provides a brief introduction to the measurement techniques and calibration proceduresavailable to QCM200 users and describes the most popular theoretical models used to interpret the results.The procedure for capacitance compensation is also described in detailBackgroundSauerbrey 1 was the first to recognize the potential usefulness of the Quartz CrystalMicrobalance (QCM) technology and demonstrate the extremely sensitive nature of thesepiezoelectric devices towards mass changes at the surface of QCM electrodes. The resultsof his work are embodied in the Sauerbrey equation, which relates the mass change perunit area at the QCM electrode surface to the observed change in oscillation frequency ofthe crystal: f = -Cf m(eqn. 1)wheref = the observed frequency change in Hz,m = the change in mass per unit area in g/cm 2 ,C f = the sensitivity factor for the crystal (56.6 Hz µg -1 cm 2 for a 5 MHz AT-cut quartzcrystal at room temperature).The Sauerbrey equation relies on a linear sensitivity factor, C f , which is a fundamentalproperty of the QCM crystal. Thus, in theory, the QCM mass sensor does not requirecalibration. However, it must be kept in mind, that the Sauerbrey equation is only strictlyapplicable to uniform, rigid, thin-film deposits 2 . Vacuum and gas phase thin-filmdepositions which fail to fulfill any of these conditions actually exhibit more complicatedfrequency-mass correlations and often require some calibration to yield accurate results.For many years, QCMs were regarded as just gas-phase mass detectors, however,recently their application has been extended since scientists realized that they can beoperated in contact with liquids and viscoelastic deposits. In this case, both resonancefrequency and series resonance resistance of the quartz oscillator are important tocompletely characterize the material in contact with the crystal electrode. Thedevelopment of QCM systems for use in fluids opened a new world of applications,including electrochemistry and microrheology. More recent developments have focusedon tailoring electrode surface chemistry (i.e. specialized polymer coatings) so that thesedevices can be applied as discriminating mass detectors for (1) specific gas detection,QCM200 Quartz Crystal Microbalance
Page 1 and 2: Operation and Service ManualQCM200Q
Page 3 and 4: Safety and Preparation For UseiSafe
Page 5 and 6: ContentsiiiContentsSafety and Prepa
Page 7 and 8: OverviewvFront Panel OverviewFigure
Page 9 and 10: OverviewviiBack Panel OverviewFigur
Page 11 and 12: OverviewixQCM25 Crystal Oscillator
Page 13 and 14: SpecificationsxiSpecificationsQCM20
Page 15 and 16: Getting Started 1Chapter 1Getting S
Page 17 and 18: Chapter 1 Getting Started 3Quick St
Page 19 and 20: Chapter 1 Getting Started 5Paramete
Page 21 and 22: Chapter 1 Getting Started 7Liquid S
Page 23 and 24: Chapter 1 Getting Started 98. Place
Page 25 and 26: Chapter 1 Getting Started 11Flow Ce
Page 27: Chapter 1 Getting Started 13Operati
Page 31 and 32: Chapter 2 Theory, Operation and Cal
Page 63 and 64: Sensor Crystals and Holders 49Chapt
Page 65 and 66: Chapter 3 Sensor Crystals and Holde
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Chapter 3 Sensor Crystals and Holde
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QCM Circuit Description 75Chapter 4
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Chapter 4 QCM Circuit Description 7
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Frequency Counter Selection Criteri
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QCM200 Remote Progamming 101Appendi
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Appendix B QCM200 Remote Programmin
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Appendix B QCM200 Remote Programmin
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Quartz Crystal Microbalance Digital Controller

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