Ordered Two-Dimensional Arrays of Ferrite Nanoparticles

Fried, Tcipi; Shemer, Gabriel; Markovich, Gil

doi:10.1002/1521-4095(200108)13:15<1158::aid-adma1158>3.0.co;2-6

Cited by 391 publications

(274 citation statements)

References 7 publications

Supporting

Mentioning

264

Contrasting

Unclassified

Order By: Relevance

“…In order to overcome these difficulties, nanometer size reactors for the formation of homogeneous nanoparticles of cobalt ferrite are used. To protect the oxidation of these nanoparticles from the atmospheric oxygen and also to stop their agglomeration, the particles are usually coated and dispersed in some medium like sodium dodecyl sulfate (NaDS) or oleic acid [3,4].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and magnetic properties of cobalt ferrite (CoFe2O4) nanoparticles prepared by wet chemical route

Maaz

Mumtaz

Hasanain

et al. 2007

Journal of Magnetism and Magnetic Materials

856

322

View full text Add to dashboard Cite

Magnetic nanoparticles of cobalt ferrite have been synthesized by wet chemical method using stable ferric and cobalt salts with oleic acid as the surfactant. X-ray Diffraction (XRD) and Transmission Electron Microscope (TEM) confirmed the formation of single phase cobalt ferrite nanoparticles in the range 15-48nm depending on the annealing temperature and time. The size of the particles increases with annealing temperature and time while the coercivity goes through a maximum, peaking at around 28nm. A very large coercivity (10.5kOe) is observed on cooling down to 77K while typical blocking effects are observed below about 260K. The high field moment is observed to be small for smaller particles and approaches the bulk value for large particles. PACS: 75.50Gg; 75.50Tt; 75.70Rf

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis and magnetic properties of cobalt ferrite (CoFe2O4) nanoparticles prepared by wet chemical route

Maaz

Mumtaz

Hasanain

et al. 2007

Journal of Magnetism and Magnetic Materials

856

322

View full text Add to dashboard Cite

show abstract

“…According to Cheng et al, 2005; the in vitro cytotoxicity test revealed that the magnetite particles exhibited excellent biocompatibility. Fe 3 O 4 nanoparticles are commonly produced via co-precipitation of Fe(II) and Fe(III) ions by a base, usually sodium hydroxide or aqueous ammonia (Kang et al, 1996;Hong et al, 1997;Fried et al, 2001) or they may be made by thermal decomposition of alkaline solution of Fe(III) chelate in the presence of hydrazine and by sonochemical decomposition of hydrolyzed Fe(II) salt followed by thermal treatment (Sapieszko et al, 1980;Vijayakumar et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Ca alginate as scaffold for iron oxide nanoparticles synthesis

Finotelli

Sampaio

Morales

et al. 2008

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

-Recently, nanotechnology has developed to a stage that makes it possible to process magnetic nanoparticles for the site-specific delivery of drugs. To this end, it has been proposed as biomaterial for drug delivery system in which the drug release rates would be activated by a magnetic external stimuli. Alginate has been used extensively in the food, pharmaceutical and biomedical industries for their gel forming properties in the presence of multivalent cations. In this study, we produced iron oxide nanoparticles by coprecipitation of Fe(III) and Fe(II). The nanoparticles were entrapped in Ca alginate beads before and after alginate gelation. XRD analysis showed that particles should be associated to magnetite or maghemite with crystal size of 9.5 and 4.3 nm, respectively. Studies using Mössbauer spectroscopy corroborate the superparamagnetic behavior. The combination of magnetic properties and the biocompatibility of alginate suggest that this biomaterial may be used as biomimetic system.

show abstract

“…1, 2 In particular, that one can produce nanoparticles with a very narrow size distribution, or the so-called monodisperse, and in high reproducibility [3][4][5][6] rendered it possible to focus on their more intrinsic properties and associated applications. 7,8 In most prospective applications, nanoparticles are used as in solutions or nanopowders.…”

mentioning

confidence: 99%

Experimental studies of strong dipolar interparticle interaction in monodisperse Fe3O4 nanoparticles

Bae

Kim

Park

et al. 2007

Applied Physics Letters

View full text Add to dashboard Cite

Interparticle interaction of monodisperse Fe 3 O 4 nanoparticles has been experimentally investigated by dispersing the nanoparticles in solvents. With increasing the interparticle distances to larger than 100 nm in a controlled manner, the authors found that the blocking temperature ͑T B ͒ of the nanoparticles drops continuously and eventually gets saturated with a total drop in T B of 7-17 K observed for 3, 5, and 7 nm samples, compared with their respective nanopowder samples. By carefully studying the dependence of T B on the interparticle distance, the authors could demonstrate that the experimental dependence of T B follows the theoretical curve of the dipole-dipole interaction. © 2007 American Institute of Physics. ͓DOI: 10.1063/1.2778758͔The past few years have seen the field of nanoparticles virtually explode and nowadays they find possible applications in very diverse areas such as high-density magnetic storage devices and biomedicine, to name only a few. 1,2 In particular, that one can produce nanoparticles with a very narrow size distribution, or the so-called monodisperse, and in high reproducibility 3-6 rendered it possible to focus on their more intrinsic properties and associated applications. 7,8 In most prospective applications, nanoparticles are used as in solutions or nanopowders. Therefore, deeper understanding of the magnetic properties of individual nanoparticles in solution and their mutual interactions will be invaluable for numerous potential applications as well as for fundamental scientific interests.In the early 1990s, interparticle interaction was studied as origin of rather unusual glassy behavior found in nanoparticles. 9 Nanoparticles diluted using paraffin were also recently shown to have blocking temperature enhanced with increasing concentration of nanoparticles, which is attributed to their strong dipolar interaction. 10 In spite of this seemingly immediate importance of the interparticle interaction, however, there has been less systematic experimental studies on the nature of the interparticle interaction. In this letter, we present extensive studies of the magnetic properties of monodisperse Fe 3 O 4 nanoparticles dispersed in different solvents, and convincingly show that the primary interaction between nanoparticles is, as expected, the dipole-dipole interaction.For our studies, we have prepared uniform and highly crystalline nanoparticles of Fe 3 O 4 by reverse micelles method, employing microemulsions as nanoreactors and hydrated iron salts as reactants. 11 As shown in Fig. 1, transmission electron microscopy ͑TEM͒ images of the 3, 5, and 7 nm particles attest that our nanoparticles are uniform in shape and in size: 3 ± 0.34, 5 ± 0.37, and 7 ± 0.37 nm. Another noteworthy point is that our high resolution TEM ͑HRTEM͒ images shown in the insets demonstrate the good crystalline nature of the particles. Therefore, we shall ignore any possible effects related to the size distribution of the nanoparticles in the following discussion of our results. We note that once we washe...

show abstract

Ordered Two-Dimensional Arrays of Ferrite Nanoparticles

Cited by 391 publications

References 7 publications

Synthesis and magnetic properties of cobalt ferrite (CoFe2O4) nanoparticles prepared by wet chemical route

Synthesis and magnetic properties of cobalt ferrite (CoFe2O4) nanoparticles prepared by wet chemical route

Ca alginate as scaffold for iron oxide nanoparticles synthesis

Experimental studies of strong dipolar interparticle interaction in monodisperse Fe3O4 nanoparticles

Contact Info

Product

Resources

About