Superparamagnetic relaxation in CoFe2O4 nanoparticles

Choi, Eun Jung; Ahn, Yeong Hee; Kim, Sehun; An, Dong Hyun; Kang, Kyoung Ah; Lee, Byung-Goo; Baek, Kyung Seon; Oak, Hang Nam

doi:10.1016/s0304-8853(03)00224-5

Cited by 54 publications

(17 citation statements)

References 12 publications

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“…Although the co-precipitation method can vary the average size of nanomagnetic particles by adjusting the pH and the temperature of aqueous media, it has only limited control over the size distribution of the particles [14]. Recently, nanosized magnetic oxides were successfully prepared via a reverse microemulsion process [7,[15][16][17]. One of the advantages of this technique is the preparation of very uniform particles (< 10% variability) [14].…”

Section: Introductionmentioning

confidence: 99%

Microstructural study and size control of iron oxide nanoparticles produced by microemulsion technique

Koutzarova

Kolev

Ghelev

et al. 2006

Phys. Status Solidi (c)

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In this paper we study the possibility to control the size of iron oxide (Fe 3 O 4 ) nanoparticles by the microemulsion technique. We used a water-in-oil reverse microemulsion system with n-hexadecil trimethylammonium bromide (CTAB) as a cationic surfactant, n-butanol as a co-surfactant, n-hexanol as a continuous oil phase, and aqueous phase. The magnetite nanopowders were synthesized by a single microemulsion technique in which the aqueous phase contains only metal ions (Fe 2+ and Fe 3+). The particle size of the powders varied in the range of 14-36 nm depending on the preparation conditions. We studied the influence of changing the water/surfactant ratio (W 0 = 5, 10, 15, 20) and the metallic ion (Fe 2+ and Fe 3+ ) concentration on the particle size distribution and crystallinity of Fe 3 O 4 .

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Section: Introductionmentioning

confidence: 99%

Microstructural study and size control of iron oxide nanoparticles produced by microemulsion technique

Koutzarova

Kolev

Ghelev

et al. 2006

Phys. Status Solidi (c)

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“…It should be noted that the subject of investigations into magnetic properties is basically nanoclusters of pure metals, particularly those of iron and cobalt and oxides thereof [1-3]. It was not until recent years that extensive research into the properties of spinel-ferrite nanoclusters (including their magnetic characteristics) got under way [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of mechanically alloyed ferrite nanopowders

et al. 2006

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The morphology, structure parameters, and magnetic characteristics of mechanically alloyed magnetite and cobalt and magnesium spinel-ferrite nanopowders are investigated. The effect of the nanopowder particle size on the saturation magnetization of the spinel ferrites and the roles of the surface anisotropy and magnetoelastic energy in the formation of the magnetic anisotropy of the materials under study are discussed within the framework of a coreshell model.

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“…Figure 4 shows the Mössbauer spectra of the powder samples PNP, PP, NPD60, and PD60 recorded at liquid Helium temperature. The spectra present slightly asymmetric magnetic hyperfine patterns, typical of cobalt-ferrite nanoparticles [71]. The .…”

Section: Characterization Of Nanosized Magnetic Particles In Complex mentioning

confidence: 95%

Using Mössbauer spectroscopy as key technique in the investigation of nanosized magnetic particles for drug delivery

Morais

2008

Hyperfine Interact

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This paper describes how cobalt ferrite nanoparticles, suspended as ionic or biocompatible magnetic fluids, can be used as a platform to built complex nanosized magnetic materials, more specifically magnetic drug delivery systems. In particular, the paper is addressed to the discussion of the use of the Mössbauer spectroscopy as an extremely useful technique in supporting the investigation of key aspects related to the properties of the hosted magnetic nanosized particle. Example of the use of the Mössbauer spectroscopy in accessing information regarding the nanoparticle modification due to the empirical process which provides long term chemical stability is included in the paper.

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Superparamagnetic relaxation in CoFe2O4 nanoparticles

Cited by 54 publications

References 12 publications

Microstructural study and size control of iron oxide nanoparticles produced by microemulsion technique

Microstructural study and size control of iron oxide nanoparticles produced by microemulsion technique

Structure and magnetic properties of mechanically alloyed ferrite nanopowders

Using Mössbauer spectroscopy as key technique in the investigation of nanosized magnetic particles for drug delivery

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