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Revised Sauerbrey Equation: A Facile Method to Quantitatively Probe the Conformation of Isolated Molecules at Solid-Liquid Interfaces

Abstract

Despite the increasingly popular application of quartz crystal microbalance (QCM) technique in monitoring the phenomena taking place at solid-liquid interfaces, ranging from changes in mass to conformation changes, it still remains a great challenge for a simple, direct relation between the signal of QCM and surface mass. In this paper we found that a proportional relation between QCM signal and the surface mass comes from the linear relation between the viscosity of adsorbed layer at solid-liquid interfaces and the surface coverage, as well as a small viscosity shift. The proportional coefficient depends on the intrinsic viscosity of adsorbates, solvent density, and quartz crystal thickness. The intrinsic viscosity is dominated by the conformation of the whole chain and the adsorption blob for end-grafted molecules and physisorbed, respectively. In terms of this revised Sauerbrey equation, the phenomena relating to conformation of discrete chains at solid-liquid interfaces can be semi-quantitatively described.

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Publication details

The article was received on 15 Mar 2018, accepted on 15 May 2018 and first published on 16 May 2018


Article type: Paper
DOI: 10.1039/C8AN00487K
Citation: Analyst, 2018, Accepted Manuscript
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    Revised Sauerbrey Equation: A Facile Method to Quantitatively Probe the Conformation of Isolated Molecules at Solid-Liquid Interfaces

    X. Du, J. Fang and D. Zhu, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C8AN00487K

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