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Iron oxide nanoparticles coated with gold: Enhanced magnetic moment due to interfacial effects
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In this paper, the authors show that when nanoparticles of Fe3O4 are coated with gold there is a distinct enhancement of magnetization by a factor of six, which is attributed to large orbital magnetic moment formation at the magnetic particle/Au (core/shell) interface.Abstract:
In this paper, we show that when nanoparticles of Fe3O4 are coated with gold there is a distinct enhancement of magnetization by a factor of six. This increase of magnetization has been attributed to large orbital magnetic moment formation at the magnetic particle/Au (core/shell) interface. Our theoretical analysis indicates that the enhanced magnetism observed in Fe3O4-Au (core-shell) nanoparticles is an interfacial effect. The origin of magnetism in Au as an interfacial phenomenon is supported by the observation of positive magnetization in citrate coated gold nanoparticles. In citrate coated gold nanoparticles, we observe a crossover from positive magnetization value to negative magnetization value upon increasing magnetic field indicating cancellation of interfacial magnetization by the diamagnetic contribution from the bulk. We propose a theoretical formalism which semi-quantitatively explains our experimental results and supports the origin of magnetization in Au as an interfacial effect.read more
Citations
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Hydrophobically Modified Sodium Alginate Conjugated Plasmonic Magnetic Nanocomposites For Drug Delivery & Magnetic Resonance Imaging
TL;DR: PTX loaded nanocomposites offer higher efficacy (∼10 %) as compared to PTX on PLC/PRF/5 human hepatocellular carcinoma cells and their contrast properties for magnetic resonance imaging in phantom agarose gel are evaluated.
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Tuning the surface magnetism of γ-Fe2O3 nanoparticles with a Cu shell
TL;DR: In this paper, an interfacial monolayer of CuO in Cu-coated γ-Fe2O3 nanoparticles enables significantly decreased intrinsic surface spin disorder compared to bare γ -Fe 2O 3 nanoparticles.
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Controlled Magnetic Properties of Iron Oxide-Based Nanoparticles for Smart Therapy
TL;DR: This review focuses on the synthesis, protection and functionalization of iron oxide-based magnetic nanoparticles in order to control magnetic properties of nanostructured systems.
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The Effects of a Varied Gold Shell Thickness on Iron Oxide Nanoparticle Cores in Magnetic Manipulation, T1 and T2 MRI Contrasting, and Magnetic Hyperthermia.
TL;DR: This work quantified the efficacy of magnetic iron oxide cores with various gold shell thicknesses in a number of popular magnetic-based nanotheranostic applications, and suggested that it is preferable to use a thinner gold shell or higher levels of stimuli to compensate for losses associated with the addition of the gold shell.
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A novel labeled and label-free dual electrochemical detection of endotoxin based on aptamer-conjugated magnetic reduced graphene oxide-gold nanocomposite
TL;DR: In this paper , a dual electrochemical detection of endotoxin was designed, where Thiourea was utilized to conjugate the magnetic graphene-based nanocomposite to a pair of amino-modified aptamers to increase the selectivity and sensitivity.
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.
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Thin films: unexpected magnetism in a dielectric oxide.
TL;DR: It is shown that thin films of hafnium dioxide (HfO2), an insulating oxide better known as a dielectric layer for nanoscale electronic devices, can be ferromagnetic even without doping.