Cited Article: Majumder M. Nanoscale hydrodynamics - Enhanced flow in carbon nanotubes
Alert Expires: 09 NOV 2010
Number of Citing Articles: 1 new records this week (1 in this e-mail)
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Title:
Collective Mechanism for the Evolution and Self-Termination of Vertically Aligned Carbon Nanotube Growth
Authors:
Bedewy, M; Meshot, ER; Guo, HC; Verploegen, EA; Lu, W; Hart, AJ
Author Full Names:
Bedewy, Mostafa; Meshot, Eric R.; Guo, Haicheng; Verploegen, Eric A.; Lu, Wei; Hart, A. John
Source:
JOURNAL OF PHYSICAL CHEMISTRY C 113 (48): 20576-20582 DEC 3 2009
Language:
English
Document Type:
Article
KeyWords Plus:
HIGHLY EFFICIENT SYNTHESIS; CHEMICAL-VAPOR-DEPOSITION; X-RAY-SCATTERING; CATALYST-SUPPORT; SUPER GROWTH; WATER; FORESTS; KINETICS; STACKS; ARRAYS
Abstract:
We explain the evolution and termination of vertically aligned carbon nanotube (CNT) "forests" by a collective mechanism, which is verified by temporal measurements of forest mass and height, as well as quantitative spatial mapping of CNT alignment by synchrotron X-ray scattering. We propose that forest growth consists of four stages: (I) self-organization; (II) steady growth with a constant CNT number density; (III) decay with a decreasing number density; and (IV) abrupt self-termination, which is coincident with a loss of alignment at the base of the forest. The abrupt loss of CNT alignment has been observed experimentally in many systems, yet termination of forest growth has previously been explained using models for individual CNTs, which do not consider the evolution of the CNT population. We propose that abrupt termination of CNT forest growth is caused by loss of the self-supporting structure, which is essential for formation of a CNT forest in the first place, and th!
at this event is triggered by accumulating growth termination of individual CNTs. A finite element model accurately predicts the critical CNT number density at which forest growth terminates and demonstrates the essential role of mechanical contact in maintaining growth of self-assembled films of filamentary nanostructures.
Reprint Address:
Hart, AJ, Univ Michigan, Dept Mech Engn, 2350 Hayward St, Ann Arbor, MI 48109 USA.
Research Institution addresses:
[Bedewy, Mostafa; Meshot, Eric R.; Guo, Haicheng; Lu, Wei; Hart, A. John] Univ Michigan, Dept Mech Engn, Ann Arbor, MI 48109 USA; [Verploegen, Eric A.] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA
E-mail Address:
ajohnh@umich.edu
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Cited Reference Count:
52
Times Cited:
0
Publisher:
AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Subject Category:
Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
ISSN:
1932-7447
DOI:
10.1021/jp904152v
IDS Number:
522ZJ
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