Characterization and magnetic properties of carbon-coated cobalt nanocapsules synthesized by the chemical vapor-condensation process

Wang, Z.H.; Choi, Chul Jin; Kim, B.K.; Kim, J.C.; Zhang, Z.D.

doi:10.1016/s0008-6223(03)00127-1

Cited by 158 publications

(78 citation statements)

References 19 publications

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“…[12] Carbon coated Co-nanocapsules have also been prepared by chemical vapour condensation. [13] Sethi and ThölØn produced metal nanoparticles by evaporation and condensation and oxidised them partly in a subsequent step resulting in metal particles and the corresponding oxide as shell. [14] Besides gas phase reactions discussed above, wet chemical methods were developed, too.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Nanocomposites

Vollath

Szabó

2004

Adv Eng Mater

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Nanocomposites may exhibit new properties of technical interest. Technical applications require many particles, leading to interaction of the particles thwarting the performance of these materials. To exploit specific nano‐properties, the use of composites preventing the particles from interaction is necessary. This leads to the application of nanocomposites. The most homogeneous composites consist of a core coated with an outer layer of a second ceramic or a polymer. For industrial or at least semi‐industrial production of nanocomposites, a process leading to non‐agglomerated powders in a sufficient quantity is needed. Additionally, coating of the particles with either a second ceramic phase or an organic one is necessary. The Karlsruhe Microwave Plasma Process fulfils these conditions.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Nanocomposites

Vollath

Szabó

2004

Adv Eng Mater

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“…4). For Dy nanoparticles/nanocapsules, the weight loss can be observed at low temperatures, due to the release of absorbed gases or moisture on the surface, and the weight exhibit a slight reduction at high temperatures above the temperature of the exothermic peak, which might be attributed to the existence of volatile matters in tube furnace (Wang et al 2003). The weight loss (*18.6%) in Dy nanocapsules is larger than that (*15.2%) in Dy nanoparticles, which can be explained by the fact that the nanocapsules with smaller particle size can absorb more gases or moisture.…”

Section: Resultsmentioning

confidence: 99%

Magnetic properties of Dy nanoparticles and Al2O3-coated Dy nanocapsules

Liu

et al. 2010

J Nanopart Res

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Dy 2 O 3 -coated Dy nanoparticles and Al 2 O 3 -coated Dy nanocapsules, with Dy cores with the average size of 3.6 and 17.6 nm, respectively, are synthesized by arc-discharge technique. The transition from ferromagnetism to antiferromagnetism absents in the Dy nanoparticles, due to that its average core size of 3.6 nm is smaller than the helix period of Dy. The temperature of the superparamagnetismantiferromagnetism transition in the Dy nanocapsules increases abnormally to 105 K, while the Néel temperature decreases to 150 K. The magneticentropy change (-DS m ) of the Dy nanoparticles rapidly increases with decreasing temperature. For Al 2 O 3 -coated Dy nanocapsules, -DS m reaches 15.2 J kg -1 K -1 at 7.5 K, due to the existence of superparamagnetism, and a peak (5.2 J kg -1 K -1 ) appears at 105 K due to the superparamgantism-antiferromagnetism transition, and -DS m exceeds 2 J kgin the temperature range from 7.5 to 105 K, for a field change from 1 to 5 T.

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“…Bi powders were prepared using metal bismuth powder as the starting material [28]. The powder was supplied by the feeding system into a graphite crucible at a rate of 20 mg/min.…”

Section: Starting Materials With a Melting Temperature Below 900°c: Zmentioning

confidence: 99%

Properties and Catalytic Effects of Nanoparticles Synthesized by Levitational Gas Condensation

Uhm¹

2018

Novel Nanomaterials - Synthesis and Applications

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One of the gas-phased methods of the levitational gas condensation (LGC) process was developed to obtain nanopowders with high purity. The instrument designed by unique concept using magnetically levitated melted droplet of metal is easily operated to synthesize nanopowder with highly defected surface. The complex compounds are also easily prepared using micron powder feeding (MPF) system in the instrument. The metals, ceramics, and carbon-coated metal nanoparticles prepared using the LGC are introduced in this chapter. Various applications such as magnetic and catalytic properties are also introduced. Nanoparticles prepared using LGC showed significantly enhanced catalytic activities during chemical reaction due to the high level of defects on their surface structure. The new heterogeneous catalysts of the solid nanoparticles were introduced in this chapter.

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Characterization and magnetic properties of carbon-coated cobalt nanocapsules synthesized by the chemical vapor-condensation process

Cited by 158 publications

References 19 publications

Synthesis and Properties of Nanocomposites

Synthesis and Properties of Nanocomposites

Magnetic properties of Dy nanoparticles and Al2O3-coated Dy nanocapsules

Properties and Catalytic Effects of Nanoparticles Synthesized by Levitational Gas Condensation

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