Spherical magnetic nanoparticles fabricated by electric explosion of wire

Kurlyandskaya, G.V.; Bhagat, S. M.; Сафронов, А. П.; Бекетов, И. В.; Larrañaga, Aitor

doi:10.1063/1.3657510

Cited by 53 publications

(48 citation statements)

References 21 publications

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“…4,25,31 The modulation technique was not employed since the FMR lines of the MNPs are broad: rather, we measured the microwave absorption (P) itself as a function of the applied field. The sample preparation procedure for microwave studies consisted of mixing MNPs with 7031 GE varnish and evenly spreading the mixture onto a 0.2 mm thick quartz plate.…”

Section: Magnetic and Microwave Characterization Methodsmentioning

confidence: 99%

“…Most likely this minor fraction of large particles is responsible for the ferromagnetic contribution in the case of as-prepared MNPs as shown in our previous report. 25 Therefore, the separation of large particles is a crucial requirement for the creation of on-purpose designed magnetic nanofluid containing de-aggregated spherical magnetite nanoparticles with a narrow size distribution. Conventionally, it is performed in liquid suspension of powder by the sedimentation procedure, which is based on Stokes's law, 4 for the velocity of sedimentation of spherical particles:…”

Section: A Structural Characterizationmentioning

confidence: 99%

“…It is ecologically safe, provides production rates up to 200 g/h, requires a small energy consumption of about 25 kWh/kg and ensures a fabrication of MNPs with an average particle size of 20-100 nm, has a high degree of sphericity and a very small level of contamination. 24,25 The phenomenon of electric explosion of wire can be described as follows. A high-density (10 4 -10 6 A/mm 2 ) current pulse (usually produced by the discharge of a capacitor bank) passes through the wire.…”

Section: Introductionmentioning

confidence: 99%

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Iron oxide nanoparticles fabricated by electric explosion of wire: focus on magnetic nanofluids

et al. 2012

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Nanoparticles of iron oxides (MNPs) were prepared using the electric explosion of wire technique (EEW). The main focus was on the fabrication of de-aggregated spherical nanoparticles with a narrow size distribution. According to XRD the major crystalline phase was magnetite with an average diameter of MNPs, depending on the fraction. Further separation of air-dry EEW nanoparticles was performed in aqueous suspensions. In order to provide the stability of magnetite suspension in water, we found the optimum concentration of the electrostatic stabilizer (sodium citrate and optimum pH level) based on zeta-potential measurements. The stable suspensions still contained a substantial fraction of aggregates which were disintegrated by the excessive ultrasound treatment. The separation of the large particles out of the suspension was performed by centrifuging. The structural features, magnetic properties and microwave absorption of MNPs and their aqueous solutions confirm that we were able to obtain an ensemble in which the magnetic contributions come from the spherical MNPs. The particle size distribution in fractionated samples was narrow and they showed a similar behaviour to that expected of the superparamagnetic ensemble. Maximum obtained concentration was as high as 5 % of magnetic material (by weight). Designed assembly of de-aggregated nanoparticles is an example of on-purpose developed magnetic nanofluid

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Section: Magnetic and Microwave Characterization Methodsmentioning

confidence: 99%

Section: A Structural Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Iron oxide nanoparticles fabricated by electric explosion of wire: focus on magnetic nanofluids

et al. 2012

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“…The detailed description of EEW equipment designed at the Institute of Electrophysics of RAS (Ekaterinburg, Russia) is given elsewhere [6][7][8]. The method is based on the evaporation of a portion of metal wire by the electric high power pulse in the explosion chamber filled with the inert atmosphere.…”

Section: Methodsmentioning

confidence: 99%

“…nanoparticles synthesized by electric explosion of wire. Inset: histogramcalculation of particle weight fraction from the image analysis, line -fitting of PSD by equation (6) likely it means that γ-Fe phase predominantly corresponds to the smallest MNPs in the ensemble. Magnetic hysteresis loops of iron MNPs (see Fig.…”

Section: Characterization Of Metallic Iron Mnpsmentioning

confidence: 99%