How temperature determines formation of maghemite nanoparticles
- We report on the formation of polymer-stabilized superparamagnetic single-core and multi-core maghemite nanoparticles. The particle formation was carried out by coprecipitation of Fe(II) and Fe(III) sulfate in a continuous aqueous process using a micromixer system. Aggregates containing 50 primary particles with sizes of 2 nm were formed at a reaction temperature of 30 °C. These particles aggregated further with time and were not stable. In contrast, stable single-core particles with a diameter of 7 nm were formed at 80 °C as revealed by small-angle X-ray scattering (SAXS) coupled in-line with the micromixer for particle characterization. X-ray diffraction and TEM confirmed the SAXS results. X-ray absorption near-edge structure spectroscopy (XANES) identified the iron oxide phase as maghemite.
Autor*innen: | Matthias Girod, Stefanie Vogel, Wojciech Szczerba, Andreas ThünemannORCiD |
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Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Journal of magnetism and magnetic materials |
Jahr der Erstveröffentlichung: | 2015 |
Verlag: | Elsevier B.V. |
Verlagsort: | Amsterdam |
Jahrgang/Band: | 380 |
Erste Seite: | 163 |
Letzte Seite: | 167 |
Freie Schlagwörter: | Carboxydextran; Iron Oxide Nanoparticles; Micromixer; Nanotechnology; SAXS; XANES |
DOI: | 10.1016/j.jmmm.2014.09.057 |
ISSN: | 0304-8853 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 20.02.2016 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 16.02.2015 |