Magnetic properties of core-shell catalyst nanoparticles for carbon nanotube growth

Fleaca, C.; Morjan, I.; Alexandrescu, R.; Dumitrache, Florian; Soare, I.; Gavrila-Florescu, L.; Normand, F. Le; Derory, A.

doi:10.1016/j.apsusc.2008.10.078

Cited by 59 publications

(14 citation statements)

References 11 publications

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“…Similar hysteresis loop behaviors have been observed in random field Ising model [41], and the EFT [14,17,42,43]. Furthermore, with the increasing temperature, the hysteresis loops decrease and these results are consistent with some theoretical [44][45][46] and experimental results [47][48][49][50][51][52].…”

Section: The Effects Of Temperature On the Hysteresis Behaviorssupporting

confidence: 89%

Magnetic properties of the spin-3/2 Blume-Capel model on a hexagonal Ising nanowire

Kocakaplan

Ertaş

2015

J. Exp. Theor. Phys.

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Magnetic properties, such as magnetizations, internal energy, specific heat, entropy, Helmholtz free energy and phase diagrams of the spin-3/2 Blume-Capel model on hexagonal Ising nanowire (HIN) with core-shell structure are studied by utilizing the effective-field theory (EFT) with correlations. Moreover, the hysteresis behaviors of the system are also investigated and the effects of Hamiltonian parameters on hysteresis behaviors are discussed, in detail. Finally, the obtained results are compared with some experimental and theoretical results and a qualitatively good agreement is found.

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Section: The Effects Of Temperature On the Hysteresis Behaviorssupporting

confidence: 89%

Magnetic properties of the spin-3/2 Blume-Capel model on a hexagonal Ising nanowire

Kocakaplan

Ertaş

2015

J. Exp. Theor. Phys.

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“…7). The nanotubes catalyzed by CF15 NP present a large diameter distribution [26], many distortions and a non-uniform surface density compared with those from CF32 NP catalyst. This can be related to the catalyst deposition conditions: drop-casting for CF15 NP and spin-coating for CF32 NP.…”

Section: Methodsmentioning

confidence: 96%

Carbon nanostructures from Fe–C nanocomposites by activated CVD methods

Fleaca

Morjan

Alexandrescu

et al. 2010

Phys. Status Solidi (c)

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Iron‐based core‐shell nanoparticles can present interesting catalytic properties for the growth of carbon nanostructures. We report the synthesis of various carbon nanostructures using activated chemical vapour deposition methods. These structures were analysed by Scanning Electon Microscopy (SEM) and Raman spectroscopy. Laser pyrolysis technique was used for synthesis of less than 10 nm diameter Fe‐C core‐shell catalyst nanoparticles. Acetone suspensions of Fe‐C nanoparticles were drop‐casted or spin coated onto Si(100) substrates. The consequence of hydrogen selective etching of these nanocomposites at 550 °C, followed by a treatment with a mixture of H2 and C2H2 at 700 °C (both in the presence of hot filaments) was the growth of corrugated ribbons and decorated or distorted carbon nanotubes/nanofibers. Round agglomerate nanoparticles and long and very thin nanotubes were observed on the substrates edges (protected from direct etching). By adding in similar conditions a glow discharge plasma to hot filaments, the resulted deposits contain oriented nanotubes. Due to the implication of the electric field, the presence of both plasma and hot wires seems to significantly change the specific growth conditions of carbon nanostructures towards those resulted when only incandescent filaments were used (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…Nanoparticles of various iron oxides, including magnetite (Fe 3 O 4 ), maghemite (γ-Fe 2 O 3 ) and hematite (α-Fe 2 O 3 ) 19 20 21 , have attracted significant attention from both theoretical and applied scientists due to their broad range of applications and their unique physical properties as components of magnetic storage media 22 and ferrofluids 23 . They have also been investigated as Lewis acid catalysts (in the Fe 3+ state) in homogeneous catalysis 24 , as catalysts for carbon nanotube growth 25 , as contrast agents for magnetic resonance imaging 26 , and also for drug targeting 27 28 29 and chemotherapy applications 28 30 . Nonetheless, there have been only a few reports concerning the synthesis of mesoporous carbon materials containing iron oxide nanoparticles 31 .…”

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confidence: 99%

A Magnetic Carbon Sorbent for Radioactive Material from the Fukushima Nuclear Accident

Yamaguchi

Furukawa²,

Takasuga³

et al. 2014

Sci Rep

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Here we present the first report of a carbon-γ-Fe2O3 nanoparticle composite of mesoporous carbon, bearing COOH- and phenolic OH- functional groups on its surface, a remarkable and magnetically separable adsorbent, for the radioactive material emitted by the Fukushima Daiichi nuclear power plant accident. Contaminated water and soil at a level of 1,739 Bq kg−1 (134Cs and 137Cs at 509 Bq kg−1 and 1,230 Bq kg−1, respectively) and 114,000 Bq kg−1 (134Cs and 137Cs at 38,700 Bq kg−1 and 75,300 Bq kg−1, respectively) were decontaminated by 99% and 90% respectively with just one treatment carried out in Nihonmatsu city in Fukushima. Since this material is remarkably high performance, magnetically separable, and a readily applicable technology, it would reduce the environmental impact of the Fukushima accident if it were used.

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Magnetic properties of core-shell catalyst nanoparticles for carbon nanotube growth

Cited by 59 publications

References 11 publications

Magnetic properties of the spin-3/2 Blume-Capel model on a hexagonal Ising nanowire

Magnetic properties of the spin-3/2 Blume-Capel model on a hexagonal Ising nanowire

Carbon nanostructures from Fe–C nanocomposites by activated CVD methods

A Magnetic Carbon Sorbent for Radioactive Material from the Fukushima Nuclear Accident

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