Carbon Cones - a Structure with Unique Properties

Helgesen, Geir; Knudsen, Kenneth Dahl; Pinheiro, Jean Patrick; Skjeltorp, A. T.; Svåsand, Eldrid; Heiberg-Andersen, H.; Elgsaeter, Arnljot; Garberg, Torgunn; Naess, Stine Nalum; Raaen, S.; Tverdal, Merete F.; Yu, Xiaofeng; Melø, Thor Bernt

doi:10.1557/proc-1057-ii10-46

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…Carbon nanocones are the fifth allotropic form of carbon synthesized in 1997 25 although they were first accidentally identified in 1994. The material found after the decomposition of hydro-carbons consisted of 20 wt% carbon nanocones and 70 wt% flat carbon disks 26 , being the rest amorphous carbon. Geometrically, they consist of curved graphite sheets with one or more pentagonal rings, defining a conical apex, which is extended by a rolled-up graphene sheet into a larger conical structure 27 .…”

Section: Introductionmentioning

confidence: 99%

Superparamagnetic Cobalt Nanocomposites Synthesized by Solvothermal Synthesis in a Single Step

Castillo

Santana

2021

J. Chil. Chem. Soc.

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In this work we are reporting the synthesis and characterization of superparamagnetic cobalt nanocomposites obtained from the direct reduction of cobalt(II) salts on matrices of graphene (G) and carbon nanodisks/nanocones (Ndc) in the presence of L-serine under solvothermal conditions. The synthesized nanocomposites were characterized by X-ray powder diffraction techniques identifying in all cases the peaks associated to the matrix (G or Ndc) and three peaks at 2θ values of 44,2; 51,5; 75,8, which correspond to the Miller indices ( 111), ( 200), ( 220), characteristic of a face-centered cubic Co 0 phase. The SEM images of cobalt nanocomposites show that that using of a matrix changes the size and distribution of the metallic agglomerates, being possible to observe a more homogenous dispersion of the cobalt agglomerates on the Ndc matrix surface. Cobalt nanocomposites have a superparamagnetic behavior presenting Hc values of 14 and 60 Oe for NPs-Co 0 /G and NPs-Co 0 /Ndc respectively. The superparamagnetic property of the cobalt nanoparticles and unique properties of the matrix would generate a magnetic material with interesting properties to be studied. More research is needed to give it a potential application.

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Section: Introductionmentioning

confidence: 99%

Superparamagnetic Cobalt Nanocomposites Synthesized by Solvothermal Synthesis in a Single Step

Castillo

Santana

2021

J. Chil. Chem. Soc.

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Conical Carbon Nanoparticles in Analytical Chemistry

Soto

Aranzana

2012

Encyclopedia of Analytical Chemistry

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Conical carbon nanoparticles are a particular form of open carbon nanomaterials. Their typical structure follows from the presence of pentagonal disclinations within a seamless graphene sheet. As a result, two main carbon nanostructures are obtained: carbon nanocones and carbon nanohorns. They were discovered after fullerenes and carbon nanotubes and since then, they have been extensively studied, although their analytical applications are still to be exploited. This contribution compiles the main aspects of conical carbon nanoparticles, including their synthesis and properties as well as the functionalization procedures, which are different from those proposed for other carbon nanoparticles. Finally, the most relevant applications developed up to date are commented on.

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Optimizing the design of nanostructures for improved thermal conduction within confined spaces

Kou

Qian

et al. 2011

Nanoscale Res Lett

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Maintaining constant temperature is of particular importance to the normal operation of electronic devices. Aiming at the question, this paper proposes an optimum design of nanostructures made of high thermal conductive nanomaterials to provide outstanding heat dissipation from the confined interior (possibly nanosized) to the micro-spaces of electronic devices. The design incorporates a carbon nanocone for conducting heat from the interior to the exterior of a miniature electronic device, with the optimum diameter, D0, of the nanocone satisfying the relationship: D02(x) ∝ x1/2 where x is the position along the length direction of the carbon nanocone. Branched structure made of single-walled carbon nanotubes (CNTs) are shown to be particularly suitable for the purpose. It was found that the total thermal resistance of a branched structure reaches a minimum when the diameter ratio, β* satisfies the relationship: β* = γ-0.25bN-1/k*, where γ is ratio of length, b = 0.3 to approximately 0.4 on the single-walled CNTs, b = 0.6 to approximately 0.8 on the multiwalled CNTs, k* = 2 and N is the bifurcation number (N = 2, 3, 4 ...). The findings of this research provide a blueprint in designing miniaturized electronic devices with outstanding heat dissipation.PACS numbers: 44.10.+i, 44.05.+e, 66.70.-f, 61.48.De

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Carbon Cones - a Structure with Unique Properties

Cited by 3 publications

References 11 publications

Superparamagnetic Cobalt Nanocomposites Synthesized by Solvothermal Synthesis in a Single Step

Superparamagnetic Cobalt Nanocomposites Synthesized by Solvothermal Synthesis in a Single Step

Conical Carbon Nanoparticles in Analytical Chemistry

Optimizing the design of nanostructures for improved thermal conduction within confined spaces

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