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Imaging the coil-to-globule conformational transition of a weak polyelectrolyte by tuning the polyelectrolyte charge density

Title data

Kirwan, Luke J. ; Papastavrou, Georg ; Borkovec, Michal ; Behrens, Sven H.:
Imaging the coil-to-globule conformational transition of a weak polyelectrolyte by tuning the polyelectrolyte charge density.
In: Nano Letters. Vol. 4 (November 2004) Issue 1 . - pp. 149-152.
ISSN 1530-6992
DOI: https://doi.org/10.1021/nl034912l

Official URL: Volltext

Abstract in another language

Conformational changes of poly(vinylamine) (PVA) upon adsorption onto mica were determined by AFM. The polyelectrolyte charge can be tuned through the solution pH. At pH 3, where the PVA is highly charged, an extended coil conformation is observed. When the pH is increased, the polyelectrolyte charge decreases and induces a segmental collapse through pearl-necklace structures. Above pH 9, where the PVA is only weakly charged, one can observe a globular conformation. By analyzing the volume of the imaged objects, it could be clearly demonstrated that single molecules have been observed. By examining PVA adsorbed in its most globular conformation, the molecular mass distribution has been determined. The PVA molecules could be also detected after being grafted to an epoxy terminated surface, which has been obtained through a silanization reaction. The observed polyelectrolyte collapse through a sequence of pearl-necklace structures is likely related to analogous conformations in solution, which are predicted on theoretical grounds.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: 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 > Chair Physical Chemistry II - Univ.-Prof. Dr. Andreas Fery
Faculties
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 > 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 > 540 Chemistry
Date Deposited: 13 Sep 2017 08:44
Last Modified: 13 Sep 2017 08:44
URI: https://eref.uni-bayreuth.de/id/eprint/39585