^{PDFprof.com Search Engine}

qcm-planetepdf

Which surface-analytical techniques are used in QCM?
The combination of the QCM with other surface-analytical techniques like electrochemical cyclovoltammetry,14,15,16 optical reflectometry,17 atomic force microscopy,18,19 or the colloidal probe20,21 has been pursued for the same reason. Particularly advanced is the electrochemical QCM (EQCM).
What is a QCM resonator?
A QCM is a disk of crystalline quartz. The disk displays acoustic resonances like any other three- dimensional body. As a resonator, it distinguishes itself from other resonators by a number of features: Since crystalline quartz is weakly piezoelectric, the acoustic resonances can be probed by electrical means.
What is the strength of a QCM?
The strength of the QCM is in its tremendous accuracy with regard to frequency measurements. Unfortunately, this extreme accuracy is limited to the frequency of the peak conductance; it does not extend to the conductance (or, more generally, the complex admittance) itself.
Does QCM work with semi-infinite media?
Unfortunately, the QCM does not work well with semi- infinite media when the viscosity, η, is larger than about 50 cP. The acoustic load in this case is too large. Most polymers exceed this limit.

Which surface-analytical techniques are used in QCM?