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    Convergence of Dissipation and Impedance Analysis of Quartz Crystal Microbalance Studies

    Year: 2009

    Journal: ANALYTICAL CHEMISTRY, 20100827

    Authors: Zhang Y., Du B., Chen X., Ma H.

    Last authors: Ma, Hongwei

    Organizations: Key Laboratory of Macromolecular Synthesis and Functionalization (Ministry of Education), Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, and Department of Biomedical Engineering, College of Engineering, Peking University, Beijing 100871, China

    Country: China

    A quartz crystal microbalance (QCM) consists of a resonator, which measures the resonance frequency of the quartz slab. When coupled with a network analyzer or coupled with impulse excitation technology, QCM gives additional impedance or dissipation information, respectively. Ibis report provides a set of equations that bring the QCM community a convergence of the dissipation and impedance analysis. Equations derived from the complex frequency shift were applied to quantitatively analyze the dissipation data of polymer brushes obtained from QCM-D. The obtained viscoelastic properties of polymer brushes were then compared with those obtained by the Voigt model method. We believe that these equations will be useful in quantitative studies of interfacial phenomena accompanied with mass or viscoelasticity changes.