Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 543, Issue -, Pages 43-48Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.07.079
Keywords
Microemulsion; Core-shell nanoparticles; Iron oxide; Co-surfactant; Magnetic characteristics
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Funding
- National Natural Science Foundation of China [50972123]
- Promotive Research Fund for excellent young and middle-aged scientisits of Shandong Province [2008BS05006]
- HKUST [RPC07/08.SC05]
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Magnetic core-shell particles, each with a single iron oxide nanoparticle core, were prepared by the reverse microemulsion method. By using 1-butanol as a co-surfactant, one can effectively control the particle size ranging from 60 to 185 nm. The mechanism of incorporation of the hydrophobic nanoparticles in the center of a colloidal particle was discussed. The magnetic characteristics of the bare iron oxide nanoparticles and core-shell colloidal particles were studied by SQUID measurements. Superparamagnetic behavior has been found, with a blocking temperature of 200 and 100 K respectively. Under an external magnetic field, the as-prepared colloidal particles can assemble along the field direction to form linear structure. These give us a good chance to control the assembly of these colloidal particles by using an external field. (C) 2012 Elsevier B.V. All rights reserved.
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