Design and fabrication of new soft magnetic materials

Hasegawa, R.

doi:10.1016/j.jnoncrysol.2003.08.002

Cited by 24 publications

(13 citation statements)

References 21 publications

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“…[1][2][3][4][5][6][7]. The magnetic character of nanoparticles depends on size, shape and the occupancy state of cations in AB 2 O 4 structure [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The size induced effect on rheological properties of Co-ferrite based ferrofluid

Chand¹,

Kumar²,

Shankar³

et al. 2013

Journal of Non-Crystalline Solids

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“…[1][2][3][4][5][6][7]. The magnetic character of nanoparticles depends on size, shape and the occupancy state of cations in AB 2 O 4 structure [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The size induced effect on rheological properties of Co-ferrite based ferrofluid

Chand¹,

Kumar²,

Shankar³

et al. 2013

Journal of Non-Crystalline Solids

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“…The magnetic response of a material is highly influenced by its microstructure in addition to its shape and size. These factors depend on the processing route 6. The elaboration of bulk nanostructured metal via a bottom‐up strategy combining sol‐gel method and consolidation by hot isostatic pressing (HIP) 7 or the emerging spark plasma sintering (SPS) 8 has proved recently to be a promising approach in order to obtain ultrafine‐grained materials showing specific interesting properties.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of ultrafine‐grained cobalt samples obtained from consolidated nanopowders

Fellah

Chérif

Bouziane

et al. 2011

Physica Status Solidi (a)

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Co powders having nominal average particle size of 50 and 240 nm were synthesized using a polyol method and then consolidated by hot isostatic pressing (HIP) or the emerging spark plasma sintering (SPS) compaction processes. Bulk polycrystalline aggregates were obtained, having average grain sizes of about 200 and 300 nm, respectively. It is found that both nanoparticles and consolidated samples exhibit a soft ferromagnetic behavior. The magnetization reversal likely occurs by nucleation/propagation process. However, a curling process can be involved in the magnetization reversal for the smaller particles. The dynamic measurements provide for the consolidated samples magnetic parameters corresponding to bulk cobalt with vanishing anisotropy. The contribution of the intergranular region is found to be negligible. We can infer that the used consolidation routes insure a good magnetic interfacial contact between the particles.

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“…The metal and metal oxide that mediate the conversion of carbon dioxide into carbon monoxide, of water into hydrogen, or the CO 2 + H 2 O mixture into syngas (CO + H 2 ), are in turn converted into an oxide with enhanced magnetic characteristics. The spent oxide could either be regenerated or used for manufacturing a variety of ceramic magnets (spinel ferrites of the general formula A II B

_{2}^{III}

O 4 ) [10]; ferrites have a global annual revenue of about $5.4 billion. The regeneration could be carried out either carbothermically or with gasified biomass (a low‐quality substitute for conventional reductant) under mild experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

A novel paradigm in greenhouse gas mitigation

Azad

McDaniel

Al‐Batty

2010

Env Prog and Sustain Energy

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The ultimate chemical fate of the conventional fossil fuel combustion is always CO 2 and H 2 O, two wellknown greenhouse gases responsible for contributing considerably to the global warming. We propose a radically new concept where CO 2 and H 2 O are converted into carbon monoxide and hydrogen (individually) at one hand and into syngas (if present together; a more likely scenario) under mild experimental conditions. The products then become practical feeds for generating clean electric power via solid oxide fuel cells. Syngas is also an ideal precursor for the manufacturing of scores of valuable organic compounds, including synthetic fuels by Fischer-Tropsch process. Thus, the technique promotes beneficiation rather than sequestration and storage-currently the most widely accepted option for addressing the issue of mitigating the CO 2 -related greenhouse gas emission. The process uses either a ferrous metal or its oxide for the target-specific conversion. In addition to being inexpensive and readily available commodities, the oxide, in particular, happens to be an industrial waste as well; most of it is landfill destined. Furthermore, the two greenhouse gases are reduced into ready-to-use fuel precursors, and the solid reactants are transformed into a component from which ceramic magnets (ferrites) could be manufactured. Thus, the concept is innovative because it not only creates valuable clean energy precursors, but it does so while reducing the impact of yet another industrial and ecological pollutant.

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Design and fabrication of new soft magnetic materials

Cited by 24 publications

References 21 publications

The size induced effect on rheological properties of Co-ferrite based ferrofluid

The size induced effect on rheological properties of Co-ferrite based ferrofluid

Magnetic properties of ultrafine‐grained cobalt samples obtained from consolidated nanopowders

A novel paradigm in greenhouse gas mitigation

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