The synthesis of carbon coated Fe, Co and Ni nanoparticles and an examination of their magnetic properties

El-Gendy, Ahmed A.; Ibrahim, E.M.M.; Khavrus, Vyacheslav O.; Krupskaya, Yulia; Hampel, Silke; Leonhardt, A.; Büchner, B.; Klingeler, R.

doi:10.1016/j.carbon.2009.06.025

Cited by 191 publications

(128 citation statements)

References 39 publications

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“…Metal oxide [17, 66 -70] , metallic, mainly Fe and Co [71 -73] , and bimetallic, such as FePt [74,75] MNPs have been proposed for this purpose. Many of these materials were coated, to provide an inert and biologically compatible outer shell made of silica [67] , gold [43,57,76] or carbon [71,73] . [36,48] .…”

Section: Biomedicalmentioning

confidence: 99%

Application of alternative energy forms in catalytic reactor engineering

Houlding

Rebrov

2012

Green Processing and Synthesis

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This review provides a general overview of recent applications of magnetic nanoparticles for controlled radiofrequency (RF) heating in catalytic synthesis, mass transfer enhancement in laminar fl ow and magnetic separation. By directly delivering RF energy to magnetic materials, issues such as long heating periods and energy losses can be minimized. The main mechanisms of RF heating are briefl y reviewed. The effect of nanoparticles size, shape and composition on the effi ciency of RF heating is discussed. RF energy has been shown to be effective in many applications, however, it is still not used in chemicals due to high equipment costs.

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Section: Biomedicalmentioning

confidence: 99%

Application of alternative energy forms in catalytic reactor engineering

Houlding

Rebrov

2012

Green Processing and Synthesis

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“…[1][2][3][4][5][6][7] The growing research activity in this field has been propelled by the development of new chemical routes that allowed the synthesis of NPs with tuneable size distributions and being embedded in different insulating matrices. [8][9][10][11][12][13][14][15][16] It is worth noting that NPs of the same material and similar size but synthetized using different fabrication routes show a strong dependence of the magnetic properties on the morphology, microstructure or the nature of the matrix. 1,8,10,13 Moreover, 3d metal oxide NPs with different core-shell morphologies are also good candidates for a number of applications due to the possibility of tuning the magnetic response and/or the coating with a functional layer.…”

Section: Introductionmentioning

confidence: 99%

“…1,8,10,13 Moreover, 3d metal oxide NPs with different core-shell morphologies are also good candidates for a number of applications due to the possibility of tuning the magnetic response and/or the coating with a functional layer. 2,4,[13][14][15] Therefore, a comprehensive study combining advanced structural characterization techniques and meticulous magnetic measurements is needed to elucidate the microstructure-magnetism interplay at the nanoscale.Nickel oxide (NiO) has been under extensive research for decades due to its importance in numerous technological applications (i.e., catalysis, batteries, ceramics, etc.). Nowadays, nanosized NiO particles have generated a renewed interest because the combination of their unique properties (i.e., high surface area, short diffusional paths, exceptional magnetic properties, etc.)…”

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confidence: 99%

Interplay between microstructure and magnetism in NiO nanoparticles: breakdown of the antiferromagnetic order

et al. 2014

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The possibility of tuning the magnetic behaviour of nanostructured 3d transition metal oxides has opened up the path for extensive research activity in the nanoscale world. In this work we report on how the antiferromagnetism of a bulk material can be broken when reducing its size under a given threshold. We combined X-ray diffraction, high-resolution transmission electron microscopy, extended X-ray absorption fine structure and magnetic measurements in order to describe the influence of the microstructure and morphology on the magnetic behaviour of NiO nanoparticles (NPs) with sizes ranging from 2.5 to 9 nm. The present findings reveal that size effects induce surface spin frustration which competes with the expected antiferromagnetic (AFM) order, typical of bulk NiO, giving rise to a threshold size for the AFM phase to nucleate. Ni 2+ magnetic moments in 2.5 nm NPs seem to be in a spin glass (SG) state, whereas larger NPs are formed by an uncompensated AFM core with a net magnetic moment surrounded by a SG shell. The coupling at the core-shell interface leads to an exchange bias effect manifested at low temperature as horizontal shifts of the hysteresis loop (∼1 kOe) and a coercivity enhancement (∼0.2 kOe). IntroductionThe steadily increasing interest in magnetic nanoparticles (NPs) over the past decade has been motivated by the unusual size-dependent magnetic behaviours and by their numerous applications in modern nano-electronics, magnetic separation or biomedical areas. [1][2][3][4][5][6][7] The growing research activity in this field has been propelled by the development of new chemical routes that allowed the synthesis of NPs with tuneable size distributions and being embedded in different insulating matrices. [8][9][10][11][12][13][14][15][16] It is worth noting that NPs of the same material and similar size but synthetized using different fabrication routes show a strong dependence of the magnetic properties on the morphology, microstructure or the nature of the matrix. 1,8,10,13 Moreover, 3d metal oxide NPs with different core-shell morphologies are also good candidates for a number of applications due to the possibility of tuning the magnetic response and/or the coating with a functional layer. 2,4,[13][14][15] Therefore, a comprehensive study combining advanced structural characterization techniques and meticulous magnetic measurements is needed to elucidate the microstructure-magnetism interplay at the nanoscale.Nickel oxide (NiO) has been under extensive research for decades due to its importance in numerous technological applications (i.e., catalysis, batteries, ceramics, etc.). Nowadays, nanosized NiO particles have generated a renewed interest because the combination of their unique properties (i.e., high surface area, short diffusional paths, exceptional magnetic properties, etc.) opens an avenue for their use in fields as diverse as catalysis, [17][18][19] anodic electrochromism, 20 capacitors, 21 smart windows, 22 fuel and solar cells 23,24 or biosensors. 25 Specially intense research effor...

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“…Magnetic nanoparticles themselves are used as the active component of ferrofluids, recording tape, flexible disk recording media, as well as biomedical materials and catalysts [1]. Carbon encapsulated metal nanoparticles have received considerable attention because of their high chemical and thermal stabilities [2]. Due to the high surface to volume ratio unshielded metal nanoparticles are easily oxidized in air atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Nanodispersed Powders of Fe-Ni Particles with Carbon Shell

Чурилов¹,

Глушенко²,

Комогорцев³

et al. 2017

J. Sib. Fed. Univ., Math. phys.

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The initial carbon condensate containing nickel-iron nanoparticles with a graphite conversion was synthesized in the high-frequency carbon-helium arc plasma at ambient pressure. The nickel-iron particles were extracted by the treatment of the carbon condensate with nitric and hydrochloric acids. Undissolved residue and dissolved sample were received. Undissolved residue has both the structure and magnetic properties of (MR/Ms = 0.30, Hc = 270 Oe). Lack of hysteresis loops for the dissolved sample shown that metals are in the paramagnetic state.

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The synthesis of carbon coated Fe, Co and Ni nanoparticles and an examination of their magnetic properties

Cited by 191 publications

References 39 publications

Application of alternative energy forms in catalytic reactor engineering

Application of alternative energy forms in catalytic reactor engineering

Interplay between microstructure and magnetism in NiO nanoparticles: breakdown of the antiferromagnetic order

Nanodispersed Powders of Fe-Ni Particles with Carbon Shell

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