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HERO ID
752194
Reference Type
Journal Article
Title
Imaging Carbon Nanotube Interactions, Diffusion, and Stability in Nanopores
Author(s)
Eichmann, SL; Smith, B; Meric, G; Fairbrother, DH; Bevan, MA
Year
2011
Is Peer Reviewed?
1
Journal
ACS Nano
ISSN:
1936-0851
EISSN:
1936-086X
Volume
5
Issue
7
Page Numbers
5909-5919
Language
English
PMID
21648480
DOI
10.1021/nn2017149
Abstract
We report optical microscopy measurements of three-dimensional trajectories of individual multiwalled carbon nanotubes (MWCNTs) in nanoscale silica slit pores. Trajectories are analyzed to nonintrusively measure MWCNT interactions, diffusion, and stability as a function of pH and ionic strength. Evanescent wave scattering is used to track MWCNT positions normal to pore walls with nanometer-scale resolution, and video microscopy is used to track lateral positions with spatial resolution comparable to the diffraction limit. Analysis of MWCNT excursions normal to pore walls yields particle-wall potentials that agree with theoretical electrostatic and van der Waals potentials assuming a rotationally averaged potential of mean force. MWCNT lateral mean square displacements are used to quantify translational diffusivities, which are comparable to predictions based on the best available theories. Finally, measured MWCNT pH and ionic strength dependent stabilities are in excellent agreement with predictions. Our findings demonstrate novel measurement and modeling tools to understand the behavior of confined MWCNTs relevant to a broad range of applications.
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Other
•
Nanoscale Carbon
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