Highly stable carbon-coated Fe/SiO2 composites: Synthesis, structure and magnetic properties

Tang, Nujiang; Chen, W.; Wang, Zhong; Jiang, Hongyi; Huang, Shujing; Du, Youwei

doi:10.1016/j.carbon.2005.09.001

Cited by 39 publications

(26 citation statements)

References 15 publications

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“…However, the use of pure metal magnetic nanoparticles such as iron (Fe) is not always possible due to its instability in air. It can indeed ignite spontaneously at room temperature [12], be dissolved in acidic and basic media, and can easily agglomerate. These problems may drastically limit the application of metal nanostructures [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal Treatment of Tannin: A Route to Porous Metal Oxides and Metal/Carbon Hybrid Materials

et al. 2017

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Abstract:In the present paper, porous materials were prepared from the hydrothermal treatment of aqueous solutions of tannin, a renewable phenolic resource extracted from tree barks, containing dissolved salts of transition metals: V, Cr, Ni and Fe. Hydrothermal treatment produced carbonaceous particles doped with the aforementioned metals, and such materials were treated according to two different routes: (i) calcination in air in order to burn the carbon and to recover porous oxides; (ii) pyrolysis in inert atmosphere so as to recover porous metal/carbon hybrid materials. The nature of the metal salt was found to have a dramatic impact on the structure of the materials recovered by the first route, leading either to nano-powders (V, Cr) or to hollow microspheres (Ni, Fe). The second route was only investigated with iron, leading to magnetic Fe-loaded micro/mesoporous carbons whose texture, pore volumes and surface areas gradually changed with the iron content.

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Section: Introductionmentioning

confidence: 99%

“…To cope with such limitations, the deposition of a protective shell was suggested for improving the chemical stability of metal nanoparticles. Compared to other shells used for that purpose made of, e.g., metal oxides [15], silica [12,16], titanium [17] or polymers [18,19], carbon materials are attractive for the encapsulation…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Treatment of Tannin: A Route to Porous Metal Oxides and Metal/Carbon Hybrid Materials

et al. 2017

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“…Recently, these "core (metal)/shell (SiO 2 )" fabrication nanoparticles systems have been prepared by chemical vapor condensation (CVC) [5], sol-gel [6] and wet chemical method [7], Kim et al [8] succeeded in producing Fe/SiO 2 nanoparticles powders by the chemical vapor condensation process. Tang et al [9,10] prepared the Fe/SiO 2 nanoparticles by a sol-gel method combined with hydrogen reduction. Fu et al [11] prepared Co/SiO 2 nanoparticles by using a silane coupling agent.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of core–shell structured Co/SiO2 nanosphere

Yin

Peng

et al. 2009

Journal of Alloys and Compounds

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“…[12] Coated Fe powders consist of spherical particles and coupled duo particles, and each particle has a clear core-shell structure. [18] The shells are relatively uniform, and their thickness is 100-500 nm. The shape of the coated carbonyl iron is mainly spherical.…”

Section: Introductionmentioning

confidence: 99%

The effect of iron phosphate, alumina and silica coatings on the morphology of carbonyl iron particles

Bruncková

Kabátová

Dudrová

2009

Surface & Interface Analysis

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Carbonyl iron powders were coated with iron phosphate using phosphating method and boehmite (γ -AlOOH) or silicon hydroxide (Si(OH) 4 ) nanoparticles derived from the hydrolysis of tri-sec-butoxide (Al(OC 4 H 9 ) 3 ) or tetramethylsilane (Si(OCH 3 ) 4 ) using sol-gel method. The coated powders were dried and calcined at 400• C for 3 h in air. Cross-section morphology of coated carbonyl iron powders were investigated by scanning electron microscopy energy dispersive X-ray analysis. Coated Fe micro-particles were spherical in shape with 'shell/core' structures. The shells consisted of an amorphous layer with varying thickness (100-800 nm) and the core represented a carbonyl iron.Gelatinous morphology of dried FePO 4 coating composed from nanoparticles of iron oxyhydroxides and hydrated iron phosphate with a shell thickness of ∼100 nm around iron particles was observed. In coatings based on alumina or silica xerogels with a thickness of ∼100-150 nm or ∼200-500 nm, the coatings were composed of iron oxyhydroxides and γ -AlOOH or Si(OH) 4 . The resulting XRD diffractograms revealed the hematite (α-Fe 2 O 3 ) and magnetite (Fe 3 O 4 ) that were formed in phosphated and sol-gel coated iron powders. The X-ray diffraction patterns did not verify the presence of phosphates, alumina or silica and indicate the amorphous or nanocrystalline structure of FePO 4 , γ -Al 2 O 3 and SiO 2 .

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Highly stable carbon-coated Fe/SiO2 composites: Synthesis, structure and magnetic properties

Cited by 39 publications

References 15 publications

Hydrothermal Treatment of Tannin: A Route to Porous Metal Oxides and Metal/Carbon Hybrid Materials

Hydrothermal Treatment of Tannin: A Route to Porous Metal Oxides and Metal/Carbon Hybrid Materials

Preparation and characterization of core–shell structured Co/SiO2 nanosphere

The effect of iron phosphate, alumina and silica coatings on the morphology of carbonyl iron particles

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