Preparation of FePt Nanoparticles by Pulsed Plasma in Liquid Method

Tamura, Shota; Kelgenbaeva, Zhazgul; Yamamoto, Kenta; Chen, Li Liang; Mashimo, Tsutomu

doi:10.4028/www.scientific.net/kem.730.248

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…The experimental setup of PPL was applied as described previously [14][15][16][17], by changing the medium and some experimental conditions. Iron rods with a purity of 99.9%, a diameter of 5 mm and length of 150 mm were purchased from Rare Metallic and were immersed in a 200 mL Pyrex beaker filled with a liquid: aqueous solution (1.0 mM) of hydrogen tetrachloroaurate (HAuCl 4 ) (Kanto Chemical Co., Ltd).…”

Section: Experimental Partmentioning

confidence: 99%

See 1 more Smart Citation

Au@Fe3O4 NANOPARTICLES: PREPARATION, CHARACTERIZATION AND CYTOTOXIC EVALUATION

Kelgenbaeva

2023

AChJ

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Gold-coated iron oxide nanoparticles are a class of potential theranostic nanoparticles that have been studied for their multitude of magnetic and optical properties with possible medical applications. In this work, spherical Au@Fe3O4 nanoparticles were successfully synthesized from Fe electrodes immersed in HAuCl4 solution using a very simple method - pulsed plasma in liquid, without any dopants or special conditions for stabilization. Vibrating sample magnetometer indicated ferromagnetic behavior of the particles at room temperature with coercivity and saturation magnetization of Hc=175 and Ms= 3.56 emu/g, respectively. Face-centered cubic Au and spinel inverse structure of FCC- Fe3O4 were determined by X-Ray diffraction analysis. High-resolution transmission electron microscopic analysis revealed that Fe3O4 particles with 14 nm in size are connected to 18 nm Au particles. The cytotoxicity of the nanoparticles was evaluated using a XTT assay on Hela cells, revealing very low (cell viability: 98-89% with Fe3O4 and 99-91% for Au@Fe3O4 NPs). This indicates that Au improves biocompatibility of magnetic nanoparticles, enabling their application in biomedicine

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Section: Experimental Partmentioning

confidence: 99%

“…A key advantage of PPL are its simplicity and cost effectiveness. Up-to-date various types of nanostructures were successfully synthesized by PPL, and their properties and applications have been studied [16,17]. Unlike previous works, this study applied aqueous solution of chloroauric acid (HAuCl 4 ) as a liquid.…”

Section: Introductionmentioning

confidence: 99%

Au@Fe3O4 NANOPARTICLES: PREPARATION, CHARACTERIZATION AND CYTOTOXIC EVALUATION

Kelgenbaeva

2023

AChJ

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“…For its fabrication, several different chemo-physical routes have been proposed. Among them, thermal decomposition has been found useful [10], as well as the polyol procedure [11], reverse micelles technique [12], microwave technology [13], self-assembly and sono-chemical preparation [14], liquid-based plasma technique [15], or condensation in the gas phase [16]. In the shape of bulk alloys, FePt systems can represent an alternative to present magnets in motors for wind turbines Nanomaterials 2023, 13, 3014 2 of 11 as they can, in principle, operate in tough conditions such as variable working temperature and corrosive environment.…”

Section: Introductionmentioning

confidence: 99%

Remarkable Magnetic Properties in a Mn73.6Ga26.4 Alloy Produced via Out-of-Equilibrium Method

Crisan,

Crisan

2023

Nanomaterials

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Rare-earth-free permanent magnets with the L10 phase are actively researched for their potential as a future class of magnetic materials, capable of operating at higher temperatures and in challenging corrosion environments such as renewable energy applications. Among these classes, MnGa shows potential, being cost effective and having interesting magnetic properties. A MnGa magnetic alloy, with composition Mn73.6Ga26.4 in atomic percent, was produced via the out-of-equilibrium method, and its structural and magnetic properties were assessed using X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and extended magnetic characterization. We show that the MnGa alloy submitted to thermal annealing in optimal conditions exhibits a two-phase microstructure, where small nanocrystals of tetragonal L10/D022 magnetic phase are embedded within a D019 MnGa matrix of a non-collinear antiferromagnetic nature. These co-existing, magnetically different phases produce an optimal set of promising magnetic properties, larger than the values reported in the literature for single-phase MnGa alloys and thin films. Such large values are explained by the exchange coupling between competing non-collinear magnetic sublattices of the D019 MnGa with the net moment of the small magnetic nanocrystals of tetragonal symmetry.

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“…For these reasons, FePt nanoparticles have been intensively investigated for uses in biomedicine (magnetic hyperthermia [ 1 ], MRI imaging [ 2 ] and targeted drug delivery [ 3 ]) and in catalysis [ 4 ] as sensors [ 5 ] or biosensors [ 6 ]. Various chemical and physical synthesis methods, such as thermal decomposition using high-temperature boiling point solvents [ 7 ], polyol [ 8 ], microemulsions [ 9 ], microwave processing [ 10 ], sonochemistry [ 11 ], pulsed plasma in liquid [ 12 ], or inert gas condensation [ 13 ], have been used to obtain FePt nanoparticles with well-defined shape and controllable sizes. Various other reports deal with the specific link between synthesis methods and magnetic performances in a large range of magnetic materials [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Phase Coexistence and Hard–Soft Exchange Coupling in FePt Nanocomposite Magnets

et al. 2020

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With the aim of demonstrating phase coexistence of two magnetic phases in an intermediate annealing regime and obtaining highly coercive FePt nanocomposite magnets, two alloys of slightly off-equiatomic composition of a binary Fe-Pt system were prepared by dynamic rotation switching and ball milling. The alloys, with a composition Fe53Pt47 and Fe55Pt45, were subsequently annealed at 400 °C and 550 °C and structurally and magnetically characterized by means of X-ray diffraction, 57Fe Mössbauer spectrometry and Superconducting Quantum Interference Device (SQUID) magnetometry measurements. Gradual disorder–order phase transformation and temperature-dependent evolution of the phase structure were monitored using X-ray diffraction of synchrotron radiation. It was shown that for annealing temperatures as low as 400 °C, a predominant, highly ordered L10 phase is formed in both alloys, coexisting with a cubic L12 soft magnetic FePt phase. The coexistence of the two phases is evidenced through all the investigating techniques that we employed. SQUID magnetometry hysteresis loops of samples annealed at 400 °C exhibit inflection points that witness the coexistence of the soft and hard magnetic phases and high values of coercivity and remanence are obtained. For the samples annealed at 500 °C, the hysteresis loops are continuous, without inflection points, witnessing complete exchange coupling of the hard and soft magnetic phases and further enhancement of the coercive field. Maximum energy products comparable with values of current permanent magnets are found for both samples for annealing temperatures as low as 500 °C. These findings demonstrate an interesting method to obtain rare earth-free permanent nanocomposite magnets with hard–soft exchange-coupled magnetic phases.

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Preparation of FePt Nanoparticles by Pulsed Plasma in Liquid Method

Cited by 6 publications

References 17 publications

Au@Fe3O4 NANOPARTICLES: PREPARATION, CHARACTERIZATION AND CYTOTOXIC EVALUATION

Au@Fe3O4 NANOPARTICLES: PREPARATION, CHARACTERIZATION AND CYTOTOXIC EVALUATION

Remarkable Magnetic Properties in a Mn73.6Ga26.4 Alloy Produced via Out-of-Equilibrium Method

Magnetic Phase Coexistence and Hard–Soft Exchange Coupling in FePt Nanocomposite Magnets

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