Synthesis and characterization of size-controlled cobalt-ferrite-based ionic ferrofluids

Authors
Morais, PC Garg, VK Oliveira, AC Silva, LP Azevedo, RB Silva, AML Lima, ECD
Citation
Pc. Morais et al., Synthesis and characterization of size-controlled cobalt-ferrite-based ionic ferrofluids, J MAGN MAGN, 225(1-2), 2001, pp. 37-40
Citations number
11
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN journal
03048853 → ACNP
Volume
225
Issue
1-2
Year of publication
2001
Pages
37 - 40
Database
ISI
SICI code
0304-8853(200104)225:1-2<37:SACOSC>2.0.ZU;2-G
Abstract
Size-controlled synthesis of cobalt-ferrite nanoparticles, their passivatio n and peptization as stable ferrofluids are reported. Transmission electron microscopy and Mossbauer spectroscopy were used as characterization techni ques. Particles with little change in size distribution, in the 10-15nm dia meter ranges, were obtained using stirring speeds between 2700 and 8100 rpm . The anomalous diffusion has been used to explain the nanoparticle size-co ntrol mechanism. (C) 2001 Elsevier Science B.V. All rights reserved.