Experimental study of ferromagnetic chains composed of nanosize Fe spheres

Zhang, L.; Manthiram, Arumugam

doi:10.1103/physrevb.54.3462

Cited by 57 publications

(51 citation statements)

References 10 publications

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“…0 and nano-Fe 3 O 4 as roughly spherical and loosely aggregated into chains (when dry), a feature attributed to magnetic and van der Waals attraction between adjacent particulates, Figure 1 [16]. Following vacuum annealing, the nanoparticulates were observed still to be arranged in chains and rings, but with some diffusion bonding between previously discrete points of contact (Figure 1 Figure 2).…”

Section: Characterisation Of the Unreacted Nanoparticles Tem Imagingmentioning

confidence: 94%

The Effect of Vacuum Annealing of Magnetite and Zero-Valent Iron Nanoparticles on the Removal of Aqueous Uranium

Crane

Scott

2013

Journal of Nanotechnology

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As-formed and vacuum annealed zero-valent iron nanoparticles (nano-Fe 0 ) and magnetite nanoparticles (nano-Fe 3 O 4 ) were tested for the removal of uranium from carbonate-rich mine water. Nanoparticles were introduced to batch systems containing the mine water under oxygen conditions representative of near-surface waters, with a uranyl solution studied as a simple comparator system. Despite the vacuum annealed nano-Fe 0 having a 64.6% lower surface area than the standard nano-Fe 0 , similar U removal (>98%) was recorded during the initial stages of reaction with the mine water. In contrast, ≤15% U removal was recorded for the mine water treated with both as-formed and vacuum annealed nano-Fe 3 O 4 . Over extended reaction periods (>1 week), appreciable U rerelease was recorded for the mine water solutions treated using nano-Fe 0 , whilst the vacuum annealed material maintained U at <50 g L −1 until 4 weeks reaction. XPS analysis of reacted nanoparticulate solids confirmed the partial chemical reduction of U VI to U IV in both nano-Fe 0 water treatment systems, but with a greater amount of U IV detected on the vacuum annealed particles. Results suggest that vacuum annealing can enhance the aqueous reactivity of nano-Fe 0 and, for waters of complex chemistry, can improve the longevity of aqueous U removal.

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Section: Characterisation Of the Unreacted Nanoparticles Tem Imagingmentioning

confidence: 94%

The Effect of Vacuum Annealing of Magnetite and Zero-Valent Iron Nanoparticles on the Removal of Aqueous Uranium

Crane

Scott

2013

Journal of Nanotechnology

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“…24 % of the bulk at 300 K. [16] The reduction of the saturation magnetization for magnetic nanoparticles compared to their bulk counterparts has been studied extensively but still remains an open issue. Many possible mechanisms have been proposed, for example, the existence of impurities, [20] surface antiferromagnetic oxidation, [20] surface spin disorder, [21][22] etc.…”

Section: Full Papermentioning

confidence: 99%

Uniform Magnetic Chains of Hollow Cobalt Mesospheres from One‐Pot Synthesis and Their Assembly in Solution

Guo

Fang

Wen

et al. 2007

Adv Funct Materials

192

145

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Magnetic chains up to 10 μm in length formed of hollow cobalt mesospheres (480–850 nm) with a 60 nm thick shell are synthesized by a new soft‐assembly protocol. The obtained chains show a saturation magnetization of 37.5 emu g–1, a remnant magnetization of 1.55 emu g–1, and a coercivity of ca. 66 Oe at 300 K. A possible mechanism for the formation of the chainlike hollow structures is proposed.

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“…The saturation magnetization (M s ) and remnant magnetization (M r ) of the sample are 157.2 and 11.0 emu/g, respectively. M s is lower than that of bulk Co (168 emu/g), which may be attributed to the existence of oxides and/or organic residue on the surface of the sample [30]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 55%

Synthesis of Co submicrospheres self-assembled by Co nanosheets via a complexant-assisted hydrothermal approach

Zhang

Song

et al. 2010

Journal of Magnetism and Magnetic Materials

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Experimental study of ferromagnetic chains composed of nanosize Fe spheres

Cited by 57 publications

References 10 publications

The Effect of Vacuum Annealing of Magnetite and Zero-Valent Iron Nanoparticles on the Removal of Aqueous Uranium

The Effect of Vacuum Annealing of Magnetite and Zero-Valent Iron Nanoparticles on the Removal of Aqueous Uranium

Uniform Magnetic Chains of Hollow Cobalt Mesospheres from One‐Pot Synthesis and Their Assembly in Solution

Synthesis of Co submicrospheres self-assembled by Co nanosheets via a complexant-assisted hydrothermal approach

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