Synthesis and characterization of FePt/Au core-shell nanoparticles

Presa, Patricia de la; Multigner, M.; Morales, M.P.; Rueda, T.; Fernández-Pinel, E.; Hernando, A.

doi:10.1016/j.jmmm.2007.03.084

Cited by 38 publications

(20 citation statements)

References 11 publications

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“…Previously the reduction in the blocking temperature has also been observed in FePt@Au, FePt@SiO 2 and Fe 3 O 4 @Au core/shell nanoparticles. [31][32][33] In these systems, the size of the magnetic cores was reportedly unchanged after the coating and so the small shift of T b (i.e. 5 K for Fe 3 O 4 @Au, 12 K for FePt@Au and 55 K for FePt@SiO 2 ) was attributed to the reduction of the magnetic dipole-dipole interaction caused by the increasing interparticle spacing of the magnetic cores.…”

Section: Magnetic Properties Of Nanoparticlesmentioning

confidence: 95%

High magnetisation, monodisperse and water-dispersible CoFe@Pt core/shell nanoparticles

et al. 2017

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High magnetisation and monodisperse CoFe alloy nanoparticles are desired for a wide range of biomedical applications. However, these CoFe nanoparticles are prone to oxidation, resulting in the deterioration of their magnetic properties. In the current work, CoFe alloy nanoparticles were prepared by thermal decomposition of cobalt and iron carbonyls in organic solvents at high temperatures. Using a seeded growth method, we successfully synthesised chemically stable CoFe@Pt core/shell nanostructures. The obtained core/shell nanoparticles have high saturation magnetisation up to 135 emu g. The magnetisation value of the core/shell nanoparticles remains 93 emu g after being exposed to air for 12 weeks. Hydrophobic CoFe@Pt nanoparticles were rendered water-dispersible by encapsulating with poly(maleic anhydride-alt-1-octadecene) (PMAO). These nanoparticles were stable in water for at least 3 months and in a wide range of pH from 2 to 11.

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Section: Magnetic Properties Of Nanoparticlesmentioning

confidence: 95%

High magnetisation, monodisperse and water-dispersible CoFe@Pt core/shell nanoparticles

et al. 2017

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“…Recently, Gao et al developed a process to create FePt nanoparticles encapsulated with a shell composed of CoS 2 or CdO to serve as multifunctional nanostructures with cytotocity toward cancer cells or to provide fluorescence detectability [54,55]. Although the toxicity of FePt nanoparticles themselves has not been thoroughly evaluated with only limited in vitro cytotoxicity assays reported throughout the literature [56], inert coatings such as gold shells are actively being investigated to improve the biocompatibility of these MNPs [57].…”

Section: Bi-metallic Nanoparticlesmentioning

confidence: 99%

Magnetic nanoparticles in MR imaging and drug delivery

Sun

Lee

Zhang

2008

Advanced Drug Delivery Reviews

2,319

1,507

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Magnetic nanoparticles (MNPs) possess unique magnetic properties and the ability to function at the cellular and molecular level of biological interactions making them an attractive platform as contrast agents for magnetic resonance imaging (MRI) and as carriers for drug delivery. Recent advances in nanotechnology have improved the ability to specifically tailor the features and properties of MNPs for these biomedical applications. To better address specific clinical needs, MNPs with higher magnetic moments, non-fouling surfaces, and increased functionalities are now being developed for applications in the detection, diagnosis, and treatment of malignant tumors, cardiovascular disease, and neurological disease. Through the incorporation of highly specific targeting agents and other functional ligands, such as fluorophores and permeation enhancers, the applicability and efficacy of these MNPs have greatly increased. This review provides a background on applications of MNPs as MR imaging contrast agents and as carriers for drug delivery and an overview of the recent developments in this area of research.

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“…Such nanoparticles exhibit cytotoxicity towards cancer cells [ 116 , 117 ]. On the other hand, coverage of FePt nanoparticles with a gold shell (FePt@Au) increases their biocompatibility [ 118 ]. Mentioned gold-coated FePt nanoparticles were synthesized from a high-temperature solution phase by the simultaneous reduction of platinum (II) acetylacetonate and decomposition of Fe(CO) 5 in octyl ether solvent.…”

Section: Magnetic Nanoparticles Synthesismentioning

confidence: 99%

Magnetic Nanoparticles: From Design and Synthesis to Real World Applications

et al. 2017

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The increasing number of scientific publications focusing on magnetic materials indicates growing interest in the broader scientific community. Substantial progress was made in the synthesis of magnetic materials of desired size, morphology, chemical composition, and surface chemistry. Physical and chemical stability of magnetic materials is acquired by the coating. Moreover, surface layers of polymers, silica, biomolecules, etc. can be designed to obtain affinity to target molecules. The combination of the ability to respond to the external magnetic field and the rich possibilities of coatings makes magnetic materials universal tool for magnetic separations of small molecules, biomolecules and cells. In the biomedical field, magnetic particles and magnetic composites are utilized as the drug carriers, as contrast agents for magnetic resonance imaging (MRI), and in magnetic hyperthermia. However, the multifunctional magnetic particles enabling the diagnosis and therapy at the same time are emerging. The presented review article summarizes the findings regarding the design and synthesis of magnetic materials focused on biomedical applications. We highlight the utilization of magnetic materials in separation/preconcentration of various molecules and cells, and their use in diagnosis and therapy.

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Synthesis and characterization of FePt/Au core-shell nanoparticles

Cited by 38 publications

References 11 publications

High magnetisation, monodisperse and water-dispersible CoFe@Pt core/shell nanoparticles

High magnetisation, monodisperse and water-dispersible CoFe@Pt core/shell nanoparticles

Magnetic nanoparticles in MR imaging and drug delivery

Magnetic Nanoparticles: From Design and Synthesis to Real World Applications

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