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Leng J, Guo Z, Zhang H, et al. Negative Thermophoresis in Concentric Carbon Nanotube Nanodevices. Nano Lett. 2016;16(10):6396-6402doi: 10.1021/acs.nanolett.6b02815.
Leng, J., Guo, Z., Zhang, H., Chang, T., Guo, X., & Gao, H. (2016). Negative Thermophoresis in Concentric Carbon Nanotube Nanodevices. Nano letters, 16(10), 6396-6402. https://doi.org/10.1021/acs.nanolett.6b02815
Leng, Jiantao, et al. "Negative Thermophoresis in Concentric Carbon Nanotube Nanodevices." Nano letters vol. 16,10 (2016): 6396-6402. doi: https://doi.org/10.1021/acs.nanolett.6b02815
Leng J, Guo Z, Zhang H, Chang T, Guo X, Gao H. Negative Thermophoresis in Concentric Carbon Nanotube Nanodevices. Nano Lett. 2016 Oct 12;16(10):6396-6402. doi: 10.1021/acs.nanolett.6b02815. Epub 2016 Sep 16. PMID: 27626825.
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Nano Lett. 2016 Oct 12;16(10):6396-6402. doi: 10.1021/acs.nanolett.6b02815. Epub 2016 Sep 16.

Negative Thermophoresis in Concentric Carbon Nanotube Nanodevices.

Nano letters

Jiantao Leng, Zhengrong Guo, Hongwei Zhang, Tienchong Chang, Xingming Guo, Huajian Gao

Affiliations

  1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University , Shanghai 200072, People's Republic of China.
  2. School of Engineering, Brown University , Providence, Rhode Island 02912, United States.

PMID: 27626825 DOI: 10.1021/acs.nanolett.6b02815

Abstract

Positive and negative thermophoresis in fluids has found widespread applications from mass transport to molecule manipulation. In solids, although positive thermophoresis has been recently discovered in both theoretical and experimental studies, negative thermophoresis has never been reported. Here we reveal via molecular dynamics simulations that negative thermophoresis does exist in solids. We consider the motion of a single walled carbon nanotube nested inside of two separate outer tubes held at different temperatures. It is found that a sufficiently long inner tube will undergo negative thermophoresis, whereas positive thermophoresis is favorable for a relatively short inner tube. Mechanisms for the observed positive thermophoresis and negative thermophoresis are shown to be totally different. In positive thermophoresis, the driving force comes mainly from the thermally induced edge force and the interlayer attraction force, whereas the driving force for negative thermophoresis is mainly due to the thermal gradient force. These findings have enriched our knowledge of the fundamental driving mechanisms for thermophoresis in solids and may stimulate its further applications in nanotechnology.

Keywords: edge force; interlayer attraction force; molecular dynamics simulations; negative thermophoresis; thermal gradient force

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