Title
A formation mechanism for catalytically grown helix-shaped graphite nanotubes
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Washington, D.C. ,
Subject
Engineering sciences. Technology
Source (journal)
Science / American Association for the Advancement of Science [Washington, D.C.] - Washington, D.C.
Volume/pages
265(1994) :5172 , p. 635-639
ISSN
0036-8075
1095-9203
ISI
A1994NZ53800025
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The concept of a spatial-velocity hodograph is introduced to describe quantitatively the extrusion of a carbon tubule from a catalytic particle. The conditions under which a continuous tubular surface can be generated are discussed in terms of this hodograph, the shape of which determines the geometry of the initial nanotube. The model is consistent with all observed tubular shapes and explains why the formation process induces stresses that may lead to ''spontaneous'' plastic deformation of the tubule. This result is due to the violation of the continuity condition, that is, to the mismatch between the extrusion velocity by the catalytic particle, required to generate a continuous tubular surface, and the rate of carbon deposition.
E-info
https://repository.uantwerpen.be/docman/iruaauth/db2afc/a9b4373.pdf
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