Issue 32, 2008
From the journal:

Physical Chemistry Chemical Physics

A macroscopic water structure based model for describing charging phenomena at inert hydrophobic surfaces in aqueous electrolyte solutions

Johannes Lützenkirchen,*a   Tajana Preočaninb  and  Nikola Kallay*b  

* Corresponding authors

a Institut für Nukleare Entsorgung, Forschungszentrum Karlsruhe, Postfach 3640, Karlsruhe, Germany
E-mail: johannes.luetzenkirchen@ine.fzk.de

b Laboratory of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, Zagreb, Croatia
E-mail: nkallay@chem.pmf.hr
Fax: +385 1 4606 131
Tel: +385 1 4606 133

Abstract

A simple general model framework for the charge development at hydrophobic surfaces in aqueous electrolyte solutions is proposed. It is based on the idea of enhanced autolysis of interfacial water triggered by a structured layer of water. The model is applied to experimental data for air, oil, diamond and Teflon aqueous interfaces and to the ice–water interface. The structure of the interfaces, as derived from sum frequency spectroscopy and molecular dynamics simulations, is used as a conceptual basis. The proposed model describes zeta potential data and supplementary macroscopic data well. The experimental zeta potentials used for the modelling of the different systems exhibit differences in magnitude. Streaming current measurements yield higher zeta potentials than conventional electrophoretic mobility measurements. This discrepancy in the data is reconciled in the resulting model parameters, such as the slip plane distance, s, an empirical parameter that allows the quantitative description of reported zeta potentials. Overall, the model parameters are consistent with similar work on other types of surfaces. Differences between the various surfaces studied in the present work can be explained by the difference in their properties, the different experimental techniques used and/or the diversity in data for nominally identical systems.

Graphical abstract: A macroscopic water structure based model for describing charging phenomena at inert hydrophobic surfaces in aqueous electrolyte solutions

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Article information

DOI
https://doi.org/10.1039/B807395C
Article type
Paper
Submitted
01 May 2008
Accepted
10 Jul 2008
First published
21 Jul 2008

Phys. Chem. Chem. Phys., 2008,10, 4946-4955

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A macroscopic water structure based model for describing charging phenomena at inert hydrophobic surfaces in aqueous electrolyte solutions

J. Lützenkirchen, T. Preočanin and N. Kallay, Phys. Chem. Chem. Phys., 2008, 10, 4946 DOI: 10.1039/B807395C

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