Producing Al and Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Nanopowders by Electrical Explosion of Wire

Kotov, Yu. A.; Azarkevich, E. I.; Бекетов, И. В.; Demina, T. M.; Мурзакаев, А. М.; Саматов, О. М.

doi:10.4028/www.scientific.net/kem.132-136.173

Cited by 51 publications

(28 citation statements)

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“…The above mentioned effects were verified by a number of types of nanoparticles produced when the energy injected into the metal was much lower than the energy of evaporation: for Al 2 O 3 , 26 TiO 2 , ZrO 2 and, in particular, for Fe 2 O 3 +Fe 3 O 4 27 nanoparticles. It was found that in these cases the wires disintegrated into micrometer-sized particles which burned while they scattered in the oxidizing gas and left behind a vapor tail where the oxide nanoparticles were formed.…”

Section: Introductionmentioning

confidence: 90%

“…Since explosion products expand as a cylinder with a much larger density than the density of the surrounding gas, oxidation takes place only on the surface of this cylinder while metal particles are formed inside the cylinder. 24,26 This causes a decrease in the vapor concentration. Oxygen penetrates inside the cylinder of explosion products and brings about the process of burning and evaporating the formed metal particles and the subsequent condensation of the vapors to form the oxide particles.…”

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: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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

et al. 2012

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“…Different fractions of the powders are collected in four different chambers. Two fractions of the powders are collected separately by passing through mechanical and electrical filters and the remaining two are collected in small cyclone and screw separator (Kotov et al 1997). The finest fraction collected by passing the powder through mechanical filters has been taken for the current experiments.…”

Section: Powder Preparationmentioning

confidence: 99%

Comparative Nanoparticle Size Characterization of EEW Alumina Using Various Measurement Techniques

Saha

Mukhopadhyay

Johnson

2012

Particulate Science and Technology

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Modern material science is paying more attention on the development of nanomaterials for superior properties in various fields of applications like mechanical, thermal, electronic, bio-medical etc. For such applications, determination of nanoparticle sizes along with their distribution is important for attaining the desired properties. Particle sizes along with the crystallite sizes of oxides, non-oxides and metallic nanopowders produced by different processes can be determined by different techniques which includes x-ray diffraction=neutron diffraction (XRD=ND), transmission electron microscopy=field emission scanning electron microscopy (TEM=FESEM), BrunauerEmmett-Teller (BET) surface area method, small angle neutron scattering (SNAS), dynamic light scattering (DLS), static light scattering (SLS), etc. For average nano-metric particle size determination, DLS is the most frequently used technique that gives a distribution that approximates the exact binomial distribution of large numbers of nanoparticulates with varying particle size under investigation (Gaussian distribution). However, the other techniques mainly give either localized distribution of the particles under observation or the distribution derived from type II isotherm. In this investigation, nano-alumina powder produced by the electrical explosion of wire technique (EEW) is used for comparative evaluation of particle size analysis by DLS measurement technique for nanoparticles vis-à -vis to other techniques like XRD (for crystallite size), FESEM, BET, and TEM. The superiority of the DLS technique has been discussed in details with respect to the unique features of its Gaussian distribution nature.

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“…전기폭발에 의한 나노분말 제조기술은 펄스파워 기술이 갖는 높은 에 너지 효율 및 고순도 나노분말 제조 가능 등의 장점 을 가지고 있다 [1][2][3][4][5][6][7][8][9][10]. 액중 전기폭발 기술은 기중 전기폭발 기술에 비하여 입도 및 분산에 있어서 장점 이 있다 [11,12].…”

Section: 서 론 1)unclassified

Synthesis and Analysis of Zn Nanopowders by Wire Explosion In Liquids

Cho

Kim²,

Choi³

et al. 2012

Journal of the Korean Institute of Electrical and Electronic Ma

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Zn wires have been electrically exploded in methanol or distilled water using the pulsed power technologies. The nanopowders produced by the explosions have been observed by using SEM and TEM, and analyzed its phase by using EDS and XRD. The nanopowders produced in distilled water showed ZnO phase only. On the other hands, the nanopowder produced in methanol showed mixed phases with Zn and ZnO. The HR-TEM images of the nanopowders produced in methanol showed that the some particles have been coated with carbon like materials. It is considered that the carbon coatings could be depended on the positions of the particles during the plasma state formed by explosion.

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Producing Al and Al<sub>2</sub>O<sub>3</sub> Nanopowders by Electrical Explosion of Wire

Cited by 51 publications

References 0 publications

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

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

Comparative Nanoparticle Size Characterization of EEW Alumina Using Various Measurement Techniques

Synthesis and Analysis of Zn Nanopowders by Wire Explosion In Liquids

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