Magnetic resonance of ferrite nanoparticles:

Gazeau, Florence; Bacri, Jean‐Claude; Giligny, François; Perzynski, R.; Raǐkher, Yu. L.; Stepanov, V. I.; Dubois, Emmanuelle

doi:10.1016/s0304-8853(98)00080-8

Cited by 263 publications

(241 citation statements)

References 34 publications

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“…[8], we study the effect of field-freezing. Samples diluted in toluene (freezing temperature T fr = 180 K) have been cooled and frozen in the external magnetic field B fr .…”

Section: : -Ch2ch2ch2n + (C10h21)2(ch3) a -: R-(och2ch2)7o(ch2)3so3 -mentioning

confidence: 99%

“…[8]. According to [8] B fr [T] predomination of the axial type of magnetic anisotropy (in the case of the cubic magnetocrystalline anisotropy, one would observe the dependence with two maxima). This issue will be discussed below (Section III.F).…”

Section: : -Ch2ch2ch2n + (C10h21)2(ch3) a -: R-(och2ch2)7o(ch2)3so3 -mentioning

confidence: 99%

“…A number of magnetic resonance experiments were performed by various authors on assemblies of randomly oriented nanoparticles (as a rule, nanoparticles were embedded in a diamagnetic matrix to weaken or even exclude the interparticle interaction) [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. For the most part the agreement between experimental data and theoretical predictions is rather poor and does not provide an opportunity of accurate quantitative analysis of the experimental results.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic resonance in nanoparticles: between ferro- and paramagnetism

Ногинова

Chen

Weaver

et al. 2007

J. Phys.: Condens. Matter

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Magnetic nanoparticles of γ-Fe 2 O 3 coated by organic molecules and suspended in liquid and solid matrices, as well as a non-diluted magnetic fluid have been studied by electron magnetic resonance (EMR) at 77-380 K. Slightly asymmetric spectra observed at room temperature become much broader, symmetric, and shift to lower fields upon cooling. An The shift and broadening of the spectrum upon cooling are ascribed to the role of the surface layer, which is considered with taking into account the strong surface-related anisotropy. To describe the overall spectrum shape, a "quantization" model is used which includes summation of the resonances corresponding to various orientations of the particle's magnetic moment at a given temperature. This approach, supplemented with some phenomenological assumptions, provides satisfactory agreement with the experimental data.

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“…[8], we study the effect of field-freezing. Samples diluted in toluene (freezing temperature T fr = 180 K) have been cooled and frozen in the external magnetic field B fr .…”

Section: : -Ch2ch2ch2n + (C10h21)2(ch3) a -: R-(och2ch2)7o(ch2)3so3 -mentioning

confidence: 99%

Section: : -Ch2ch2ch2n + (C10h21)2(ch3) a -: R-(och2ch2)7o(ch2)3so3 -mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic resonance in nanoparticles: between ferro- and paramagnetism

Ногинова

Chen

Weaver

et al. 2007

J. Phys.: Condens. Matter

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“…The dependence of T B with the excitation frequency of the alternating field was well described by the Arrhenius law. The fitting to the expression T B ( 00 ) ¼ U/k B ln(1/2 f 0 ) provided the activation energy U that, as a first approximation, was proportional to the average particle volume, U ¼ K eff V. The effective anisotropy constant K eff ¼ 1.7 Â 10 5 erg cm À3 (1.7 Â 10 4 J m À3 ) was in the range expected for maghemite nanoparticles [24]. The specific absorption rate of a maghemite-based ferrofluid prepared by the same method and containing non-agglomerated, highly crystalline and monodisperse nanoparticles with an average size of 11.6 nm and a concentration of 1.89 mg Á mL À1 , measured at 315 K, 3 kA m À1 and 109 kHz was 0.89 W g À1 [25].…”

Section: Resultsmentioning

confidence: 99%

Encapsulation of magnetic nanoparticles in a pH-sensitive poly(4-vinyl pyridine) polymer: a step forward to a multi-responsive system

Arizaga

Ibarz

Piñol

et al. 2012

Journal of Experimental Nanoscience

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A multiresponsive system that consists on pH-responsive polymer microspheres with encapsulated iron oxide magnetic nanoparticles that rendered the core magnetic to enable externally controlled actuation under magnetic induction has been developed. The inorganic nanoparticles were first prepared and, then, further encapsulated in a pH-sensitive poly(4-vinylpyridine). These spheres have been obtained by a modification of the simple, rapid and high-reproducible nanoprecipitation method. Magnetic measurements showed that the iron oxide nanoparticles are superparamagnetic and, therefore, able to undergo a local increase of the temperature when an oscillating magnetic field is applied. Magnetically triggered heating and pH sensitivity can be useful for biomedical applications.

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“…Though as classical as other materials, they still extend their applications with nanosize ferrites, for example as more efficient contrast agents for magnetic imaging, 1 or as hyperthermia materials. 2 Equally interesting and important as this magnetic activity of soft ferrites will be their electrotechnical properties.…”

Section: Introductionmentioning

confidence: 99%