期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 380, 期 -, 页码 163-167出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2014.09.057
关键词
Iron Oxide Nanoparticles; Micromixer; SAXS; XANES; Carboxydextran
资金
- EU project Nano Mag
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 degrees 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 degrees 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. (C) 2014 Elsevier B.V. All rights reserved.
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