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Issue 10, 2002
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Viscoelasticity in the diffuse electric double layer

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Abstract

The electroacoustical impedance of the quartz crystal microbalance (QCM) in contact with aqueous electrolyte solutions was measured using the transfer function method in a flow injection system . Measurements of both components of the impedance of the QCM, the resistance R and the inductive reactance XL, have been performed for modified and bare gold and silver surfaces and for different concentrations of several aqueous electrolyte solutions. For the experimental concentration range of 0–50 mM, unexpectedly the QCM impedance does not follow the Kanazawa equation, as is usual for bulk newtonian liquids. This behavior indicates the presence of a nanometric sized viscoelastic layer between the piezoelectric crystal and the bulk electrolyte solution. This layer can only be identified as the Gouy–Chapman diffuse double layer (DDL). Its elasticity and viscosity have been estimated by the measurement of R and XL. The viscoelasticity of the DDL appears to be independent of the chemical nature of the surface and of the solution viscosity but strongly dependent on the surface charge, the bulk electrolyte concentration and the dielectric constant of the solvent.

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Publication details

The article was received on 01 Jul 2002, accepted on 19 Aug 2002 and first published on 09 Sep 2002


Article type: Paper
DOI: 10.1039/B206305K
Citation: Analyst, 2002,127, 1347-1352
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    Viscoelasticity in the diffuse electric double layer

    R. Etchenique and T. Buhse, Analyst, 2002, 127, 1347
    DOI: 10.1039/B206305K

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