Microstructure of mesocarbon microbeads prepared from synthetic isotropic naphthalene pitch in the presence of carbon black

Yong Gang Wang, Minato Egashira, Sumihito Ishida, Yozo Korai, Isao Mochida

研究成果: ジャーナルへの寄稿記事

33 引用 (Scopus)

抄録

Mesocarbon microbeads (MCMB) prepared from a synthetic naphthalene isotropic pitch with or without carbon black were compared in their microstructure observed under high resolution scanning electron microscopy and transmission electron microscopy (TEM). The spheres prepared without carbon black exhibited an assemble of microdomain units with a number of voids among the units after isolation by pyridine extraction. In contrast, the spheres prepared in the presence of BP2000 and Ketjen Black with a chain structure had smooth surfaces covered with carbon black particles. TEM showed the dispersion of chain particles in the inside of the sphere as well as some shell skin 50-200 nm in thickness surrounding the sphere. MA600 of non-chain structure was found to be distributed on the surface and the inside of the sphere, however, isolated microdomains were observed on the surface of the sphere with a number of voids. MCMB are produced through a series of steps: the formation of mesogen molecules; the formation of insoluble microdomains; the assembly of microdomains into spheres; the incorporation of a soluble fraction in the sphere; and the phase separation of spheres in the isotropic matrix. The particles on the surface form the shell with mesogens which are almost insoluble in pyridine. The chain structure appears to the key to the formation of such a shell. Another portion of carbon blacks stays in the matrix, increasing its viscosity preventing the coalescence and precipitation of spheres and suspending their dispersion in the matrix.

元の言語英語
ページ(範囲)307-314
ページ数8
ジャーナルCarbon
37
発行部数2
DOI
出版物ステータス出版済み - 1 1 1999

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Soot
Naphthalene
Carbon black
Microstructure
Pyridine
naphthalene
Transmission electron microscopy
High resolution electron microscopy
Coalescence
Phase separation
Skin
Viscosity

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

これを引用

Microstructure of mesocarbon microbeads prepared from synthetic isotropic naphthalene pitch in the presence of carbon black. / Wang, Yong Gang; Egashira, Minato; Ishida, Sumihito; Korai, Yozo; Mochida, Isao.

:: Carbon, 巻 37, 番号 2, 01.01.1999, p. 307-314.

研究成果: ジャーナルへの寄稿記事

Wang, Yong Gang ; Egashira, Minato ; Ishida, Sumihito ; Korai, Yozo ; Mochida, Isao. / Microstructure of mesocarbon microbeads prepared from synthetic isotropic naphthalene pitch in the presence of carbon black. :: Carbon. 1999 ; 巻 37, 番号 2. pp. 307-314.
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abstract = "Mesocarbon microbeads (MCMB) prepared from a synthetic naphthalene isotropic pitch with or without carbon black were compared in their microstructure observed under high resolution scanning electron microscopy and transmission electron microscopy (TEM). The spheres prepared without carbon black exhibited an assemble of microdomain units with a number of voids among the units after isolation by pyridine extraction. In contrast, the spheres prepared in the presence of BP2000 and Ketjen Black with a chain structure had smooth surfaces covered with carbon black particles. TEM showed the dispersion of chain particles in the inside of the sphere as well as some shell skin 50-200 nm in thickness surrounding the sphere. MA600 of non-chain structure was found to be distributed on the surface and the inside of the sphere, however, isolated microdomains were observed on the surface of the sphere with a number of voids. MCMB are produced through a series of steps: the formation of mesogen molecules; the formation of insoluble microdomains; the assembly of microdomains into spheres; the incorporation of a soluble fraction in the sphere; and the phase separation of spheres in the isotropic matrix. The particles on the surface form the shell with mesogens which are almost insoluble in pyridine. The chain structure appears to the key to the formation of such a shell. Another portion of carbon blacks stays in the matrix, increasing its viscosity preventing the coalescence and precipitation of spheres and suspending their dispersion in the matrix.",
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