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dc.contributor.authorPagani, Guido
Green, Micah J.
Poulin, Philippe
Pasquali, Matteo
dc.date.accessioned 2013-03-27T15:30:03Z
dc.date.available 2014-03-28T05:10:03Z
dc.date.issued 2012
dc.identifier.citation Pagani, Guido, Green, Micah J., Poulin, Philippe, et al.. "Competing mechanisms and scaling laws for carbon nanotube scission by ultrasonication." PNAS, 109, no. 29 (2012) National Academy of Sciences: 11599-11604. http://dx.doi.org/10.1073/pnas.1200013109.
dc.identifier.urihttps://hdl.handle.net/1911/70847
dc.description.abstract Dispersion of carbon nanotubes (CNTs) into liquids typically requires ultrasonication to exfoliate individuals CNTs from bundles. Experiments show that CNT length drops with sonication time (or energy) as a power law t?m. Yet the breakage mechanism is not well understood, and the experimentally reported power law exponent m ranges from approximately 0.2 to 0.5. Here we simulate the motion of CNTs around cavitating bubbles by coupling Brownian dynamics with the Rayleigh-Plesset equation. We observe that, during bubble growth, CNTs align tangentially to the bubble surface. Surprisingly, we find two dynamical regimes during the collapse: shorter CNTs align radially, longer ones buckle.We compute the phase diagram for CNT collapse dynamics as a function of CNT length, stiffness, and initial distance from the bubble nuclei and determine the transition from aligning to buckling. We conclude that, depending on their length, CNTs can break due to either buckling or stretching. These two mechanisms yield different power laws for the length decay (0.25 and 0.5, respectively), reconciling the apparent discrepancy in the experimental data.
dc.language.iso eng
dc.publisher National Academy of Sciences
dc.rights Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.title Competing mechanisms and scaling laws for carbon nanotube scission by ultrasonication
dc.type Journal article
dc.contributor.funder Air Force Office of Scientific Research
dc.contributor.funder Air Force Research Laboratory
dc.contributor.funder Welch Foundation
dc.contributor.funder Evans-Attwell Welch Fellowship
dc.contributor.funder Rice Cray XD1 Research Cluster
dc.contributor.funder Texas Tech University High Performance Computing Center
dc.citation.journalTitle PNAS
dc.contributor.org Richard E. Smalley Institute for Nanoscale Science and Technology
dc.citation.volumeNumber 109
dc.citation.issueNumber 29
dc.embargo.terms 1 year
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1073/pnas.1200013109
dc.identifier.pmcid PMC3406882
dc.identifier.pmid 22752305
dc.identifier.grantID FA9550-09-1-0590 (Air Force Office of Scientific Research)
dc.identifier.grantID C-1668 (Welch Foundation)
dc.type.publication publisher version
dc.citation.firstpage 11599
dc.citation.lastpage 11604


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