Carbon nanospheres and tubules obtained by the pyrolysis of hydrocarbons

Govindaraj, A.; Sen, Rahul; Nagaraju, B.; Rao, C.N.R.

doi:10.1080/095008397178977

Cited by 34 publications

(21 citation statements)

References 1 publication

(1 reference statement)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After the discovery of carbon nanotubes in 1991 by Iijima,1 various structures, which are more or less related to fullerenes, including single‐wall and multiwalled carbon nanotubes,1–3 carbon nanohorns,4–6 carbon nanospheres,7–10 and onion‐like carbon structures11, 12 have been prepared. Such structures, if containing metals,13–15 have additional potential as magnetic particles, contrast agents, protecting cloaks, catalysts, and in other applications.…”

Section: Methodsmentioning

confidence: 99%

Solid‐State Synthesis of Well‐Defined Carbon Nanocapsules from Organometallic Precursors

Jain

Winkel

Wilhelm

2006

Small

View full text Add to dashboard Cite

To cap it all…︁ The pyrolysis of a [CpFe(arene)]PF6 complex yielded new carbon nanocapsules in near‐quantitative yield (see TEM image); the capsules contain an Fe–P composite material. The results show that the structure of the obtained material is highly dependent on the complex used in the pyrolysis experiments, and that pyrolyis parameters have to be carefully chosen in order to obtain the nanocapsules in pure form.

show abstract

Section: Methodsmentioning

confidence: 99%

Solid‐State Synthesis of Well‐Defined Carbon Nanocapsules from Organometallic Precursors

Jain

Winkel

Wilhelm

2006

Small

View full text Add to dashboard Cite

show abstract

“…Carbon spheres with graphitic structure have even been grown without using catalysts. 8 On the basis of our experimental data, the nucleation and growth of the helical carbon nanotube are proposed as follows. The hexagonal carbon rings are the basic structural units that form the graphite lattice.…”

Section: Growth Mechanismmentioning

confidence: 99%

Kinetically Controlled Growth of Helical and Zigzag Shapes of Carbon Nanotubes

2000

View full text Add to dashboard Cite

This paper focuses on the growth mechanism of the multiwalled carbon nanotubes exhibiting helical and zigzag growth morphologies. Our data support a kinetically controlled growth model in which the creation rates of the pentagon and heptagon carbon rings determine the geometrical shapes of the nanotubes. The carbon nanotube is believed to be grown from a carbon cluster that is nucleated from a pentagon carbon ring followed by a spiral shell growth. The pairing of pentagonal-heptagonal (P-H) carbon rings is essential in forming the helical and zigzag structures. If there is no twist in the P-H orientation along the body of the carbon nanotube, a planar-spiral structure would be formed. If the P-H pairs twist their orientations along the growth direction of the nanotube, a helical structure would be formed. The periodicity and the coiling diameter of the helix are determined by the angle of the twist and the distance between the adjacent P-H pairs. If the P-H pairs are densely accumulated at a local region and the interpair distance is small, a node is formed, thus, the zigzag growth morphology.

show abstract

“…Moreover, many carbon materials have been synthesized by reduction of scCO 2 ; for example, Chen's group has successfully prepared diamond [7][8][9], carbon nanotubes [10,11], and carbon spheres [12] by chemical reduction of CO 2 with alkali and alkaline-earth metals. It has also been shown that carbon materials can be synthesized by simple pyrolysis of hydrocarbons [13][14][15][16][17]. Carbon materials with porous structure have received a great deal of attention due to their many potential applications and have been synthesized using various methods [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Treatment of discarded oil in supercritical carbon dioxide for preparation of carbon microspheres

Kong

Wei

et al. 2011

J Mater Cycles Waste Manag

View full text Add to dashboard Cite

Carbon microspheres with diameter of 1-10 lm were prepared by treatment of waste oil in a supercritical carbon dioxide (scCO 2 ) system. The structure and morphology of the products were characterized by X-ray diffraction, field-emission scanning electron microscopy, and Raman spectrometry. It is shown that the products consist of graphite microspheres with relatively low graphitization. The yield of solid products increased from 26.8 wt% to 42.2 wt% as the reaction temperature was raised from 530°C to 600°C. Spheres with multilayer structure could be obtained by means of subsequent vacuum annealing of the carbon microspheres at 1500°C. The formation mechanisms of carbon microspheres in the scCO 2 system and the influence of vacuum annealing on the structure are discussed in detail.

show abstract

Carbon nanospheres and tubules obtained by the pyrolysis of hydrocarbons

Cited by 34 publications

References 1 publication

Solid‐State Synthesis of Well‐Defined Carbon Nanocapsules from Organometallic Precursors

Solid‐State Synthesis of Well‐Defined Carbon Nanocapsules from Organometallic Precursors

Kinetically Controlled Growth of Helical and Zigzag Shapes of Carbon Nanotubes

Treatment of discarded oil in supercritical carbon dioxide for preparation of carbon microspheres

Contact Info

Product

Resources

About