Techniques based upon the electrical response of the quartz crystal microbalance QCM have been widely used in laboratories as routine tools. In this article we present and discuss applications of the QCM or its variant, the electrochemical quartz crystal microbalance, EQCM to the viscoelastic characterization of lms. It is pointed out that correlations between the motion of quartz crystal and contacting lms and overlayers as well as the in uence of the electronic circuit on the electric state of the whole system are of fundamental importance in interpreting the results.
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