Journal ArticleDOI
Magnetic properties of CoFe2O4 nanoparticles synthesized through a block copolymer nanoreactor route
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TLDR
In this paper, the development of self-assembled magnetic CoFe2O4 nanoparticles within polymer matrices at room temperature is reported, which are uniformly dispersed within the polymer matrix and have an average radius of 4.8±1.4nm.Abstract:
The development of self-assembled magnetic CoFe2O4 nanoparticles within polymer matrices at room temperature is reported. Diblock copolymers consisting of poly (norbornene) and poly (norbornene-dicarboxcylic acid) (NOR/NORCOOH) were synthesized. The self-assembly of the mixed metal oxide within the NORCOOH block was achieved at room temperature by processing the copolymer nanocomposite using wet chemical methods. Morphology and magnetic properties were determined by superconducting quantum interference device magnetometry, transmission electron microscopy, wide angle x-ray diffraction, and 57Fe Mossbauer spectroscopy. The CoFe2O4 nanoparticles are uniformly dispersed within the polymer matrix, and have an average radius of 4.8±1.4 nm. The nanocomposite films are superparamagnetic at room temperature and ferrimagnetic at 5 K.read more
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Magnetic Properties of Magnetic Nanoparticles for Efficient Hyperthermia.
TL;DR: This work discusses some of the physics principles for effective heating of MNPs focusing on the role of surface anisotropy, interface exchange an isotropy and dipolar interactions, and some physical and practical limitations of using MNPs in magnetic hyperthermia.
Journal ArticleDOI
Synthesis and characterization of manganese ferrite nanoparticles by thermal treatment method
TL;DR: In this paper, the authors used polyvinyl pyrrolidon (PVP) as a capping agent to control the agglomeration of the manganese ferrite nanoparticles.
Journal ArticleDOI
Cation distribution dependence of magnetic properties of sol–gel prepared MnFe2O4 spinel ferrite nanoparticles
TL;DR: In this article, the Stoner-Wohlfarth model was used to detect superparamagnetism at room temperature as implied from vibrating sample magnetometry, and the occupation ratio of Fe 3+ ions at the octahedral sites decreases from 43% to 39%.
Journal ArticleDOI
From Precision Synthesis of Block Copolymers to Properties and Applications of Nanoparticles.
Xiao Li,Xiao Li,James Iocozzia,Yihuang Chen,Shiqiang Zhao,Xun Cui,Wei Wang,Wei Wang,Haifeng Yu,Shaoliang Lin,Zhiqun Lin +10 more
TL;DR: This Review discusses recent progress in the design of block copolymer templates for crafting spherical inorganic nanoparticles including compact, hollow, and core-shell varieties and the precise control over the size and morphology of nanoparticles.
References
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Journal ArticleDOI
Surface Spin Disorder in NiFe2O4 Nanoparticles.
TL;DR: In this paper, a model of the magnetization within these particles consisting of ferrimagnetically aligned core spins and a spin-glass-like surface layer is proposed, and the qualitative features of this model are reproduced by a numerical calculation of the spin distribution.
Journal ArticleDOI
Noncollinear Spin Arrangement in Ultrafine Ferrimagnetic Crystallites
TL;DR: In this article, it was shown that the spin configuration differs from the N\'eel type found in large crystallites, and it was proposed that the ions in the surface layer are inclined at various angles to the direction of the net moment.
Journal ArticleDOI
Standard X‐Ray Diffraction Powder Patterns
TL;DR: Forty-six standard x ray diffraction powder patterns were presented in this article, fourteen of which are to repace twelve patterns already given in the x ray Powder Data File, and thirty-four are for substances not previously included.