Compressive dynamic scission of carbon nanotubes under sonication: fracture by atomic ejection

Title
Compressive dynamic scission of carbon nanotubes under sonication: fracture by atomic ejection
Authors
Huck Beng Chew문명운이광렬Kyung-Suk Kim
Keywords
CNT; sonication; buckling; fracture; atomic scission; carbon nanotube; nanofluidics
Issue Date
2011-05
Publisher
Proceedings of the Royal Society A-Mathematical, physical, and engineering sciences
Citation
VOL 467, NO 2129, 1270-1289
Abstract
We report that a graphene sheet has an unusual mode of atomic-scale fracture owing to its structural peculiarity, i.e. single sheet of atoms. Unlike conventional bondbreaking tensile fracture, a graphene sheet can be cut by in-plane compression, which is able to eject a row of atoms out-of-plane. Our scale-bridging molecular dynamics simulations and experiments reveal that this compressive atomic-sheet fracture is the critical precursor mechanism of cutting single-walled carbon nanotubes (SWCNTs) by sonication. The atomic-sheet fracture typically occurs within 200 fs during the dynamic axial buckling of a SWCNT; the nanotube is loaded by local nanoscale flow drag of water molecules caused by the collapse of a microbubble during sonication. This is on the contrary to common speculations that the nanotubes would be cut in tension, or by high-temperature chemical reactions in ultrasonication processes. The compressive fracture mechanism clarifies previously unexplainable diameter-dependent cutting of the SWCNTs under sonication.
URI
http://pubs.kist.re.kr/handle/201004/41900
ISSN
1364-5021
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