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Dependence of Structural Forces in Polyelectrolyte Solutions on Charge Density: A Combined AFM/SAXS Study

Title data

Qu, Dan ; Baigl, Damien ; Williams, Claudine E. ; Möhwald, Helmuth ; Fery, Andreas:
Dependence of Structural Forces in Polyelectrolyte Solutions on Charge Density: A Combined AFM/SAXS Study.
In: Macromolecules. Vol. 36 (September 2003) Issue 18 . - pp. 6878-6883.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma034305k

Official URL: Volltext

Abstract in another language

We have investigated the structural forces in aqueous, salt-free, semidilute solutions of partially sulfonated polystyrene (PSS) of various charge fractions f using colloidal probe atomic force microscopy and small-angle X-ray scattering (SAXS). Near interfaces, we find an exponentially damped oscillatory force-distance characteristic whose period d corresponds to the characteristic length of the density fluctuations in bulk. d scales with monomer concentration C as d ) d0CR, where R varies progressively from -0.51 for fully charged PSS to -0.31 for the lowest charge fraction investigated. This can be explained by changes in the polyelectrolyte configuration as the charge is reduced, due to the hydrophobic nature of the backbone. The decay length λ of the force is in all cases proportional to C -1/2 and is closely matching the range of positional correlations extracted from the SAXS data. The amplitude A of the force is proportional to the effective charge (feff) of the polyelectrolyte.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Chair Physical Chemistry II - Univ.-Prof. Dr. Andreas Fery
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry II
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Result of work at the UBT: No
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 09 Dec 2014 08:14
Last Modified: 05 Feb 2015 11:41
URI: https://eref.uni-bayreuth.de/id/eprint/4053