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A descriptive model linking possible formation mechanisms for graphite-encapsulated nanocrystals to processing parameters

Published online by Cambridge University Press:  31 January 2011

B. R. Elliott,
J. J. Host,
V. P. Dravid,
M. H. Teng and
J-H. Hwang
B. R. Elliott
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
J. J. Host
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
V. P. Dravid*
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
M. H. Teng
Affiliation:
Department of Geology, National Taiwan University, Taipei, Taiwan, Republic of China
J-H. Hwang
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
*
a)Author to whom correspondence should be addressed.
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Abstract

New and modified mechanisms are proposed to account for detailed observations of carbon encapsulation of Fe, Ni, and Co nanocrystals. The mechanisms are based on aerosol and gas phase chemistry and on the catalytic effects of transition metals. Two parameters are found to qualitatively dominate production: the local-path carbon-to-metal ratio (LCM) and the global carbon-to-metal ratio (GCM). LCM's select which mechanisms are active along each pathway within the reactor. The GCM places bounds upon and determines the weighting between different LCM's and thus determines the distribution of different nanoscale products within the collected, macroscopic product. A two part processing parameter → mechanism → product map links the components. The generality of the model is discussed throughout with reference to related processes and the encapsulation of other materials.

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Articles
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Journal of Materials Research , Volume 12 , Issue 12 , December 1997, pp. 3328 - 3344
Copyright
Copyright © Materials Research Society 1997

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