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Diffusion of Nanocars on an Air–Glass Interface

  • Tao Jin
    Tao Jin
    Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
    More by Tao Jin
  • Víctor García-López
    Víctor García-López
    Department of Chemistry, Department of Materials Science and Nanoengineering, and Smalley Curl Institute and NanoCarbon Center, Rice University, Houston, Texas 77005, United States
  • Shunsuke Kuwahara
    Shunsuke Kuwahara
    Department of Chemistry, Department of Materials Science and Nanoengineering, and Smalley Curl Institute and NanoCarbon Center, Rice University, Houston, Texas 77005, United States
    Department of Chemistry, Faculty of Science, Toho University, Funabashi, Chiba 274-8510, Japan
  • Pinn-Tsong Chiang
    Pinn-Tsong Chiang
    Department of Chemistry, Department of Materials Science and Nanoengineering, and Smalley Curl Institute and NanoCarbon Center, Rice University, Houston, Texas 77005, United States
  • James M. Tour*
    James M. Tour
    Department of Chemistry, Department of Materials Science and Nanoengineering, and Smalley Curl Institute and NanoCarbon Center, Rice University, Houston, Texas 77005, United States
    *E-mail: [email protected] (J.M.T.).
  • , and 
  • Gufeng Wang*
    Gufeng Wang
    Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
    *E-mail: [email protected]. Tel: (919) 515-1819 (G.W.).
    More by Gufeng Wang
Cite this: J. Phys. Chem. C 2018, 122, 33, 19025–19036
Publication Date (Web):July 26, 2018
https://doi.org/10.1021/acs.jpcc.8b05668
Copyright © 2018 American Chemical Society

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    Abstract

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    At room temperature, four-adamantane-wheeled nanocars thermally diffuse on an air–glass interface. A line-scan imaging method was developed to improve the time resolution in tracking their surface movement. The fast imaging technique disclosed that the four-wheeled nanocars diffuse on glass surfaces in a quasi-random two-dimensional (2D) diffusion manner. That is, they have a high tendency to keep a linear diffusion trajectory at a short time scale, which is consistent with the wheel-rolling mode diffusion. The nanocar molecules lose the directionality over time, indicating that other diffusion modes, e.g., pivoted movement, may also contribute to their thermal diffusion at room temperature. The characteristic linear movement time for the two types of nanocar molecules in this study was ∼1.2 s, from which the activation energy for the nanocars to pivot away from the original direction was estimated to be ∼65 kJ mol–1. Finally, it was shown that using the line-scanning method the diffusion coefficient of quasi-random 2D diffusing nanocars can be accurately estimated to be ∼10.0 × 10–16 m2 s–1.

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    Cited By

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