Journal ArticleDOI
Chemical Control of Superparamagnetic Properties of Magnesium and Cobalt Spinel Ferrite Nanoparticles through Atomic Level Magnetic Couplings
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TLDR
In this paper, a correlation between the electron spin−orbital angular momentum coupling and the superparamagnetic properties has been established in MgFe2O4 and CoFe 2O4 spinel ferrite nanoparticles The contribution to the magnetic anisotropy from the Fe3+ lattice sites is almost the same in both nanocrystallites as neutron diffraction studies have shown a similar cation distribution in these two types of spinel magnetite nanoparticles.Abstract:
A correlation between the electron spin−orbital angular momentum coupling and the superparamagnetic properties has been established in MgFe2O4 and CoFe2O4 spinel ferrite nanoparticles The contribution to the magnetic anisotropy from the Fe3+ lattice sites is almost the same in both nanocrystallites as neutron diffraction studies have shown a similar cation distribution in these two types of spinel ferrite nanoparticles Due to the strong magnetic couplings from Co2+ lattice sites, the blocking temperature of CoFe2O4 nanoparticles is at least 150 deg higher than the same sized MgFe2O4 nanoparticles Mossbauer spectroscopy studies demonstrate that the magnetic anisotropy of CoFe2O4 nanoparticles is higher than that of the same size MgFe2O4 nanoparticles These studies indicate that the superparamagnetic properties of nanoparticles can be controlled through chemically adjusting the magnetic anisotropy energyread more
Citations
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Synthesis of monodisperse spherical nanocrystals.
TL;DR: Mechanistic studies have shown that monodisperse nanocrystals are produced when the burst of nucleation that enables separation of the nucleation and growth processes is combined with the subsequent diffusion-controlled growth process through which the crystal size is determined.
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Chemical synthesis of magnetic nanoparticles
TL;DR: Recent advances in the synthesis of various magnetic nanoparticles using colloidal chemical approaches are reviewed and ferrite nanoparticles have been synthesized by the thermal decomposition of organometallic precursors followed by oxidation or by low-temperature reactions inside reverse micelles.
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Magnetic fluid hyperthermia: focus on superparamagnetic iron oxide nanoparticles.
TL;DR: In this review, the limitations and recent advances in the development of superparamagnetic iron oxide nanoparticles for hyperthermia are presented.
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Iron Oxide Based Nanoparticles for Multimodal Imaging and Magnetoresponsive Therapy.
TL;DR: Magnetoresponsive Therapy Nohyun Lee, Dongwon Yoo, Daishun Ling,†,‡,⊥ Mi Hyeon Cho, Taeghwan H Yeon,*,†,† and Jinwoo Cheon.
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Templated synthesis of nanostructured materials
TL;DR: The use of both physical and chemical hard colloidal templates, soft templates, and other non-colloidal templates are examined, followed by the perspective on the state of the field and potential future directions.
References
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Journal ArticleDOI
Magnetic Properties of Nanostructured Materials
TL;DR: In this paper, a classification of nanostructure morphology according to the mechanism responsible for the magnetic properties is presented, followed by a brief discussion of some promising experimental techniques in synthesis and measurements.
BookDOI
Scientific and clinical applications of magnetic carriers
TL;DR: Preparation and Modification of Biodegradable Magnetic Particles: Preparation and Application of Monosized magnetic Particles in Selective Cell Separation and Applications in Molecular Biology and Drug Delivery and Radionuclide Therapy.
Journal ArticleDOI
Size-dependent magnetic properties of MnFe 2 O 4 fine particles synthesized by coprecipitation
Ji-Gen Chen,Christopher M. Sorensen,K. J. Klabunde,George C. Hadjipanayis,E. Devlin,A. Kostikas +5 more
TL;DR: In this article, a series of samples with various sizes but the same microstructure were created by an aqueous phase coprecipitation method and the Curie temperature is modified in association with these changes.
Journal ArticleDOI
Reverse Micelle Synthesis and Characterization of Superparamagnetic MnFe2O4 Spinel Ferrite Nanocrystallites
TL;DR: In this paper, the authors showed that these MnFe2O4 nanoparticles are truly superparamagnetic and showed that they can have a size distribution as narrow as ∼9%.
Journal ArticleDOI
Size-dependent Curie temperature in nanoscale MnFe2O4 particles.
TL;DR: The Curie temperature of ferrimagnetic nanoscale particles by means of direct measurement of the magnetization is determined using the finite-size-scaling formula.