Surfactant effects in magnetite nanoparticles of controlled size
By Pablo Guardia, B. Batlle-Brugal, A. G. Roca, Ò. Iglesias, M. P. Morales, Carlos J. Serna, A. Labarta, X. Batlle. 2006
255 citations recorded by the source corpus.
Abstract Magnetite Fe3O4 nanoparticles of controlled size within 6 and 20 nm in diameter were synthesised by thermal decomposition of an iron organic precursor in an organic medium. Particles were coated with oleic acid. For all samples studied, saturation magnetisation Ms is size-independent, and reaches a value close to that expected for bulk magnetite, in contrast to results in small particle systems for which Ms is usually much smaller due to surface spin disorder. The coercive field for the 6 nm particles is in agreement with coherent rotation, taking the bulk magnetocrystalline anisotropy into account. Both results suggest that the oleic acid molecules covalently bonded to the nanoparticle surface yield a strong reduction in the surface spin disorder. However, although the saturated state may be similar, the approach to saturation is different and, in particular, the high-field differential susceptibility is one order of magnitude larger than in bulk materials. The relevance of these results in biomedical applications is discussed.
Subfields: Biomaterials, Biomedical Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/4d1f48fca38ec66f4d28724117a984519845f3cc
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In Biomedical Engineering
In Materials Chemistry
Citations in the corpus
- Fabrication, characterization and measurement of thermal conductivity of Fe3O4 nanofluids (2010, background): “36 emu g , respectively, which are lower than that of the bulk Fe3O4 (92 emu g ) [19,20].”
- Synthesis and surface modification of uniform MFe2O4 (M = Fe, Mn, and Co) nanoparticles with tunable sizes and functionalities (2012, background): “…is the use of bifunctional ligands in ligand exchange reactions, where one functional group is bonded to the nanoparticle surface (i.e., carboxylic groups) and the other stabilizes the NP by electrostatic charge (i.e., phosphates, thiols, and amine functional groups) (Gupta and Gupta 2005).”