Issue 21, 2011
From the journal:

Physical Chemistry Chemical Physics

Effect of ionic strength and type of ions on the structure of water swollen polyelectrolyte multilayers†‡

S. Dodoo,a   R. Steitz,b   A. Laschewskyc  and  R. von Klitzing*a  

* Corresponding authors

a Technische Universität Berlin, Stranski-Laboratorium, Department of Chemistry, TU Berlin, Strasse des 17. Juni 124, D-10623 Berlin, Germany
E-mail: klitzing@chem.tu-berlin.de
Fax: +49 (0)30 31426602
Tel: +49 (0)30 31423931

b Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany

c Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, D-14476 Potsdam-Golm, Germany

Abstract

This study addresses the effect of ionic strength and type of ions on the structure and water content of polyelectrolyte multilayers. Polyelectrolyte multilayers of poly(sodium-4-styrene sulfonate) (PSS) and poly(diallyl dimethyl ammonium chloride) (PDADMAC) prepared at different NaF, NaCl and NaBr concentrations have been investigated by neutron reflectometry against vacuum, H2O and D2O. Both thickness and water content of the multilayers increase with increasing ionic strength and increasing ion size. Two types of water were identified, “void water” which fills the voids of the multilayers and does not contribute to swelling but to a change in scattering length density and “swelling water” which directly contributes to swelling of the multilayers. The amount of void water decreases with increasing salt concentration and anion radius while the amount of swelling water increases with salt concentration and anion radius. This is interpreted as a denser structure in the dry state and larger ability to swell in water (sponge) for multilayers prepared from high ionic strengths and/or salt solution of large anions. No exchange of hydration water or replacement of H by D was detected even after eight hours incubation time in water of opposing isotopic composition.

Graphical abstract: Effect of ionic strength and type of ions on the structure of water swollen polyelectrolyte multilayers

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Article information

DOI
https://doi.org/10.1039/C0CP01357A
Article type
Paper
Submitted
28 Jul 2010
Accepted
31 Mar 2011
First published
26 Apr 2011

Phys. Chem. Chem. Phys., 2011,13, 10318-10325

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Effect of ionic strength and type of ions on the structure of water swollen polyelectrolyte multilayers

S. Dodoo, R. Steitz, A. Laschewsky and R. von Klitzing, Phys. Chem. Chem. Phys., 2011, 13, 10318 DOI: 10.1039/C0CP01357A

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