Using diamond as a metastable phase carbon source to facilitate the synthesis of graphite encapsulated metal (GEM) nanoparticles by an arc-discharge method

Teng, Mao‐Hua; Tsai, Shao-Wei; Hsiao, Chung-I; Chen, Yung-Der

doi:10.1016/j.jallcom.2006.08.275

Cited by 18 publications

(9 citation statements)

References 7 publications

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“…In addition, R. dauricum contained all 10 haplotypes, while R. mucronulatum had only one haplotype (H6) and shared it with R. dauricum. Compared to other temperate species, such as R. delavayi (Hd = 0.5570) (Sharma et al, 2014), R. simsii (Hd = 0.749) (Li et al, 2012), and Platycrater arguta (Hd = 0.8820) (Qiu et al, 2009), R. dauricum was in the middle (Hd = 0.6610), but fewer than 170 angiosperms indicate cpDNA haplotype diversity (Hd = 0.6700) (Petit et al, 2005). As noted by Wright and Gaut (2005), a series of factors may contribute to genetic diversity in plant species.…”

Section: Discussionmentioning

confidence: 97%

A Genomewide Scan for Genetic Structure and Demographic History of Two Closely Related Species, Rhododendron dauricum and R. mucronulatum (Rhododendron, Ericaceae)

Yang

Zhang

Guo³

et al. 2020

Front. Plant Sci.

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Understanding the processes of divergence and speciation is an important task for evolutionary research, and climate oscillations play a pivotal role. We estimated the genetic structure and demographic history of two closely related species of Rhododendron, R. dauricum, and R. mucronulatum, distributed in northeastern China using 664,406 single nucleotide polymorphic loci of specific-locus amplified fragment sequencing (SLAF-seq) and 4 chloroplast DNA (cpDNA) fragments, sampling 376 individuals from 39 populations of these two species across their geographic distributions. The geographical distribution of cpDNA haplotypes revealed that R. dauricum and R. mucronulatum have different spatial genetic structures and haplotype diversity. Analysis of molecular variance (AMOVA) results showed that these two species have significant genetic differentiation and that the phylogeny demonstrates that these two species clustered a monophyletic group based on SLAF data, respectively, but not in cpDNA data. The evidence of significant gene flow was also detected from R. mucronulatum to R. dauricum. A deep divergence between the two species was observed and occurred during the early Oligocene. The niche models showed that the two species have different demographic histories. Thus, our results imply that geography and climate changes played important roles in the evolutionary process of R. dauricum and R. mucronulatum, and although there was an interspecific gene flow, the divergence was maintained by natural selection.

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Section: Discussionmentioning

confidence: 97%

A Genomewide Scan for Genetic Structure and Demographic History of Two Closely Related Species, Rhododendron dauricum and R. mucronulatum (Rhododendron, Ericaceae)

Yang

Zhang

Guo³

et al. 2020

Front. Plant Sci.

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“…The tungsten arc-discharge method uses tungsten rod as cathode, and the graphite crucible as anode, running at 200 Torr helium pressure, 25-15 V, and 100-150 A. Nickel pieces and synthetic diamond powder (as carbon source) were set in the graphite crucible anode. During the arcing process, nickel and carbon evaporated and condensed into the core-shell Ni-GEM material [6,7]. Although the tungsten arc-discharge method can produce much more GEM powder than the popular carbon arc-discharge method (i.e., Krätschmer-Huffman method) does, its production efficiency is still relatively poor in terms of meeting the required amount for all of our experiments.…”

Section: Methodsmentioning

confidence: 99%

“…1) are spherical core-and-shell structured material with a diameter ranging between 5 and 100 nm [1][2][3][4][5][6][7]. With their graphitic shells to protect the inner metallic core from oxidation and acid erosion, GEM can survive in harsh environments.…”

Section: Introductionmentioning

confidence: 99%

Magnetic packing of graphite encapsulated nickel nanoparticles

Teng

Tsai

Chiou

2010

Journal of Alloys and Compounds

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“…The traditional synthetic methods, including arc discharge, [16] pulsed laser irradiation, [17] and metal-catalyzed chemical vapor deposition (CVD), [18] require complex and expensive production steps. To synthesize GCN materials that are suitable for use as electrocatalytic supports in DMFCs it is essential to develop facile and low-cost synthetic methods.…”

Section: Introductionmentioning

confidence: 99%

Graphitic Carbon Nanocapsules: Scaled Preparation, Formation Mechanism, and Use as an Excellent Support for Methanol Electro‐oxidation

et al. 2012

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Graphitic carbon nanocapsules (GCNs) with high crystallinity and a large specific surface area (SSA) have been prepared in high yield by a solid‐state pyrolysis route using a polyacrylic weak‐base anion‐exchange resin (PAWBA) as the carbon source. A possible mechanism for the formation of the GCNs is proposed based on a series of experiments, including TG, FTIR, Raman, and TEM analyses, as well as on the structure of PAWBA: The catalytic iron particles are surrounded by the active carbon atoms derived from PAWBA during the pyrolytic process, which then escape from thecarbon nanocapsules as the pyrolytic temperature is further increased to finally yield the GCNs. The synthesized GCNs were used as an excellent support of platinumnanoparticles (3–5 nm) for methanol electro‐oxidation. The Pt/GCN electrocatalyst exhibited a higher catalytic activity and better durability towards methanol electro‐oxidation than Pt/C (Vulcan XC‐72R support) and commercial Pt/C(JM) catalysts. The current density of the Pt/GCN catalyst for methanol electro‐oxidation is as high as 275 A/g Pt, whereas for the Pt/C and Pt/C(JM) catalysts the values are only 190 and 184 A/g Pt, respectively.

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Using diamond as a metastable phase carbon source to facilitate the synthesis of graphite encapsulated metal (GEM) nanoparticles by an arc-discharge method

Cited by 18 publications

References 7 publications

A Genomewide Scan for Genetic Structure and Demographic History of Two Closely Related Species, Rhododendron dauricum and R. mucronulatum (Rhododendron, Ericaceae)

A Genomewide Scan for Genetic Structure and Demographic History of Two Closely Related Species, Rhododendron dauricum and R. mucronulatum (Rhododendron, Ericaceae)

Magnetic packing of graphite encapsulated nickel nanoparticles

Graphitic Carbon Nanocapsules: Scaled Preparation, Formation Mechanism, and Use as an Excellent Support for Methanol Electro‐oxidation

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