Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-5370
|Main Title:||Effect of ionic strength and type of ions on the structure of water swollen polyelectrolyte multilayers|
Klitzing, Regine von
|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.|
|DDC Class:||540 Chemie und zugeordnete Wissenschaften|
|Sponsor/Funder:||DFG, SPP 1369, Polymer-Festkörper-Kontakte: Grenzflächen und Interphasen|
DFG, EXC 314, Unifying Concepts in Catalysis
|Journal Title:||Physical chemistry, chemical physics|
|Publisher:||Royal Society of Chemistry|
|Notes:||Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.|
This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
|Appears in Collections:||Inst. Chemie » Publications|
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