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The structure of fullerene black and the incorporation of C-60 investigated by C-13 NMR

Kanowski, M. and Vieth, H. M. and Lüders, K. and Buntkowsky, G. and Belz, T. and Werner, H. and Wohlers, M. and Schlogl, R. (1997):
The structure of fullerene black and the incorporation of C-60 investigated by C-13 NMR.
In: Carbon, pp. 685-695, 35, (5), [Online-Edition: http://apps.webofknowledge.com/full_record.do?product=WOS&se...],
[Article]

Abstract

C-13 NMR measurements were performed on different fullerene black materials in order to gain knowledge about the fullerene black structure, the incorporation of C-60 molecules in the fullerene black, the generation process of the fullerenes in the are reactor, the influence of solvents and the amount of fullerenes not removable by solvents. Our results are consistent with the model that fullerene black is an amorphous carbon material containing a high amount of bent and spheroidal carbon fragments. The C-60 molecules are dispersed on the large fullerene black surface and rotate rapidly. A weak signal in the fullerene black at about 70 ppm could arise from polyynic carbon chains, one of the discussed intermediate compounds in the fullerene generation process. X-ray diffractometry shows that the treatment of the fullerene black raw material with tetrahydrofuran (THF) leads to structural relaxation and a rearrangement of carbon sheets. C-13 NMR is rather insensitive to this modified texture of the fullerene black matrix indicating that the local carbon structure remains largely unchanged by solvent treatments. In the extracted fullerene black materials we did not find fullerene signals proving that the amount of possibly entrapped fullerenes is very small and that the conventional fullerene extraction with toluene can be regarded as complete. (C) 1997 Elsevier Science Ltd.

Item Type: Article
Erschienen: 1997
Creators: Kanowski, M. and Vieth, H. M. and Lüders, K. and Buntkowsky, G. and Belz, T. and Werner, H. and Wohlers, M. and Schlogl, R.
Title: The structure of fullerene black and the incorporation of C-60 investigated by C-13 NMR
Language: English
Abstract:

C-13 NMR measurements were performed on different fullerene black materials in order to gain knowledge about the fullerene black structure, the incorporation of C-60 molecules in the fullerene black, the generation process of the fullerenes in the are reactor, the influence of solvents and the amount of fullerenes not removable by solvents. Our results are consistent with the model that fullerene black is an amorphous carbon material containing a high amount of bent and spheroidal carbon fragments. The C-60 molecules are dispersed on the large fullerene black surface and rotate rapidly. A weak signal in the fullerene black at about 70 ppm could arise from polyynic carbon chains, one of the discussed intermediate compounds in the fullerene generation process. X-ray diffractometry shows that the treatment of the fullerene black raw material with tetrahydrofuran (THF) leads to structural relaxation and a rearrangement of carbon sheets. C-13 NMR is rather insensitive to this modified texture of the fullerene black matrix indicating that the local carbon structure remains largely unchanged by solvent treatments. In the extracted fullerene black materials we did not find fullerene signals proving that the amount of possibly entrapped fullerenes is very small and that the conventional fullerene extraction with toluene can be regarded as complete. (C) 1997 Elsevier Science Ltd.

Journal or Publication Title: Carbon
Volume: 35
Number: 5
Uncontrolled Keywords: fullerenes, amorphous carbon nuclear magnetic resonance (nmr) amorphous-carbon c60 soot intercalation resolution mechanism allotrope rotation dynamics films
Divisions: 07 Department of Chemistry
07 Department of Chemistry > Physical Chemistry
Date Deposited: 27 Oct 2014 20:44
Official URL: http://apps.webofknowledge.com/full_record.do?product=WOS&se...
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Xb011 Times Cited:10 Cited References Count:55

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