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Formation of Ultrathin Birnessite-Type Nanoparticles Immobilized on Spherical Polyelectrolyte Brushes

Title data

Polzer, Frank ; Kunz, Daniel A. ; Breu, Josef ; Ballauff, Matthias:
Formation of Ultrathin Birnessite-Type Nanoparticles Immobilized on Spherical Polyelectrolyte Brushes.
In: Chemistry of Materials. Vol. 22 (25 March 2010) Issue 9 . - pp. 2916-2922.
ISSN 1520-5002
DOI: https://doi.org/10.1021/cm100226h

Abstract in another language

A new route of in situ formation and stabilization of ultrathin, needle-like manganese dioxide nanoparticles (MnO2NP) in aqueous solution by using spherical polyelectrolyte brush particles (SPB) is presented. The SPB that act as carrier particles consist of a solid polystyrene core of about 50 nm radius onto which long chains of the positively charged polyelectrolyte poly(trimethyl ammonium ethyl methacrylate chloride) (pTMAEMC) are grafted to yield an overall radius of about 85 nm. Potassium permanganate (KMnO4) is directly reduced within the brush layer of these particles because of the basic environment within this layer. This mechanism appears to limit the size of the MnO2NP to the dimensions of the brush layer. Powder X-ray diffraction, (PXRD), transmission electron microscopy (TEM), and cryogenic transmission electron microscopy (cryoTEM) prove that birnessite-type MnO2NP with a c*-disorder are generated on the SPB without adding any reducing agent. The birnessite nanoparticles have an average length of 20 nm and a breadth of about 1.6 nm. They are composed of single lamellae or of ultrathin stacks of very few lamellae. Energy-dispersive X-ray spectroscopy (EDX) demonstrates that most of the charges of the thin birnessite platelets are balanced by potassium ions. The excellent stabilization by the SPB carrier particles in aqueous solution can be traced back to a strong interaction of the birnessite particles with the positively charged pTMAEMC chains of the SPB.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I > Chair Anorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie > SFB 840 - TP B 1
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 Anorganic Chemistry I
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 23 Mar 2018 07:38
Last Modified: 23 Mar 2018 07:38
URI: https://eref.uni-bayreuth.de/id/eprint/9944