Abstract
We report on the detailed structure of MnO x nanoparticles (MnO x NP) which are either stabilized by cationic spherical polyelectrolyte brushes or by star-shaped cationic polyelectrolyte chains. In both cases, the polycation is composed of 2-(trimethylammonium)ethyl methacrylate chloride (TMAEMC). The analysis by transmission electron microscopy (TEM), cryogenic transmission electron microscopy (cryoTEM), and powder X-ray diffraction leads to the conclusion that the MnO x nanoparticles in aqueous dispersed state are composed of only a few or even single lamellae of c-disordered potassium birnessite (birnessite). Using star-shaped pTMAEMC homopolymer for the synthesis of composite particles, we obtain MnO x NP with an average diameter of about 5 nm. MnO x NP immobilized on cationic spherical polyelectrolyte brush have a length of about 20 nm and a width of 1.6 nm. Comparison of the extended X-ray absorption fine structure (EXAFS) spectra of the MnO x composites with reference spectra leads to the conclusion that all materials include c-disordered birnessite-type nanoparticles. A comparison of the energy shift of the Mn K-edge absorption peak of the X-ray absorption near-edge structure spectra of different manganese oxide reference materials with the different MnO x NP revealed an average oxidation state of about 3.5–3.7 for synthesized compounds. No distinct structural difference is found when comparing the dried samples to samples dispersed in water. A comparison of the EXAFS data of the birnessite nanoparticles with the crystal structure of macroscopic systems showed a compression along the c direction accompanied by a slight elongation within the ab plane of the layered material.
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Notes
δ-MnO2 is a synthetic analogous to the mineral vernadite [54]. According to Villalobos et al., δ-MnO2 has the same local structure as randomly stacked “acid” birnessite. The only difference is the smaller crystallite size and the fewer number of stacked layers along the c-axis as compared to birnessite [42]
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Acknowledgments
We thank the Deutsche Forschungsgemeinschaft and the Henkel AG & Co. KGaA for the financial support. This work has been a part of the dissertation of Frank Polzer.
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Polzer, F., Holub-Krappe, E., Rossner, H. et al. Structural analysis of colloidal MnO x composites. Colloid Polym Sci 291, 469–481 (2013). https://doi.org/10.1007/s00396-012-2725-8
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DOI: https://doi.org/10.1007/s00396-012-2725-8