Microstructure of carbon spherules

Hishiyama, Yoshihiro; Yoshida, Akira; Inagaki, Michio

doi:10.1016/0008-6223(82)90078-1

Cited by 32 publications

(6 citation statements)

References 5 publications

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“…Among the discrete particles were carbon spheres (type A), ranging in diameter from a few hundred nanometers to 2 μm, which at some spots appeared to just emerge from the deposited carbon surface. − , The radial spherical textures (Figure a) consisted of highly regular single spheres well separated from each other, aggregated spheres, and spherulitic nodules included in the deposited carbon surface. The carbon spheres are comparable to the “mesophase spheres” produced during carbonization of a variety of carbonaceous precursors and reported by Oberlin 12a.…”

Section: Resultsmentioning

confidence: 99%

Pyrolysis in the Mesophase: A Chemist's Approach toward Preparing Carbon Nano- and Microparticles

et al. 2002

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A mild pyrolytic method is proposed for the generation of different carbon micro- and nanoparticles that are either unprecedented or have never been reported under the present experimental conditions. A hexa-alkyl-substituted hexa-peri-hexabenzocoronene serves as a graphite-like starting compound that melts into a discotic liquid crystalline phase prior to heat-induced cross-linking and dehydrogenation. An essential feature of the process is that the liquid crystalline order persists even above 400 degrees C, i.e., during alkyl chain cleavage. The present approach bears a resemblance to carbomesophase formation during graphitization starting from pitch. The pyrolysis products are characterized by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry, optical microscopy, selected area electron diffraction (SAED), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM).

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Section: Resultsmentioning

confidence: 99%

Pyrolysis in the Mesophase: A Chemist's Approach toward Preparing Carbon Nano- and Microparticles

et al. 2002

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“…24 The structural model of carbon particles found in carbon black was proposed on the basis of dark-field imaging and electron diffraction results. 25,26 In their model, the sphere was considered to be composed of small aromatic layers which are assumed to be aligned approximately on circular conical surfaces with a common vertex in the spherule at or near the center of the spherule. According to this model, the structure of the sphere has a cylindrical symmetry around the common vertex rather than a spherical symmetry.…”

Section: Discussionmentioning

confidence: 99%

Pairing of Pentagonal and Heptagonal Carbon Rings in the Growth of Nanosize Carbon Spheres Synthesized by a Mixed-Valent Oxide-Catalytic Carbonization Process

1996

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Carbon spheres have been synthesized using a mixed-valent oxide-catalytic carbonization process in macroscopic quantities and at low cost. The technique uses natural gas and reusable catalysts and produces no environmental waste or pollution. The product is all solid spheres (∼210 nm) comprised of layered graphitic flakes. Microstructures of the spheres are studied by transmission electron microscopy. The sphere is believed to be nucleated from a pentagon carbon ring followed by a spiral shell growth. When the sphere grows larger, graphitic flakes are nucleated on the surface due to the formation of paired pentagonal-heptagonal (P-H) carbon rings. A combination of the P-H pairs with the hexagonal networks produces eight basic graphitic configurations for forming the sphere, and they have been observed experimentally.

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“…Carbon microbeads are useful materials in many fields including lithium battery anodes, , column packing materials for separation science, , absorbents with high surface area, catalyst supports, and high-performance carbon components . Carbon microbeads are commonly prepared from pitches. − Typically coal tar or petroleum pitch is heated at high temperature, usually 350−500 °C, to produce mesophase spheres in pitch.…”

Section: Introductionmentioning

confidence: 99%

Carbon Microbeads Produced through Synthesis and Pyrolysis of Poly(1,8-dibutyl-1,3,5,7-octatetrayne)

Ding

Olesik

2005

Chem. Mater.

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A self-polymerizable liquid octatetrayne, 1,8-dibutyl-1,3,5,7-octatetrayne, was heated to 80 °C and produced cross-linked poly(1,8-dibutyl-1,3,5,7-octatetrayne) microbeads via suspension polymerization with diameters adjustable from hundreds of micrometers to a few micrometers. Carbon microbeads that may be useful for catalyst supports or in high-performance carbon materials were obtained by the pyrolysis of poly(1,8-dibutyl- 1,3,5,7-octatetrayne) microbeads at 800 °C under an inert atmosphere.

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Microstructure of carbon spherules

Cited by 32 publications

References 5 publications

Pyrolysis in the Mesophase: A Chemist's Approach toward Preparing Carbon Nano- and Microparticles

Pyrolysis in the Mesophase: A Chemist's Approach toward Preparing Carbon Nano- and Microparticles

Pairing of Pentagonal and Heptagonal Carbon Rings in the Growth of Nanosize Carbon Spheres Synthesized by a Mixed-Valent Oxide-Catalytic Carbonization Process

Carbon Microbeads Produced through Synthesis and Pyrolysis of Poly(1,8-dibutyl-1,3,5,7-octatetrayne)

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