Adhesion and size dependent friction anisotropy in boron nitride nanotubes

Hsiang Chih Chiu*, Sedat Dogan, Mirjam Volkmann, Christian Klinke, Elisa Riedo


研究成果: 雜誌貢獻期刊論文同行評審

9 引文 斯高帕斯(Scopus)


The frictional properties of individual multiwalled boron nitride nanotubes (BN-NTs) synthesized by chemical vapour deposition (CVD) and deposited on a silicon substrate are investigated using an atomic force microscope tip sliding along (longitudinal sliding) and across (transverse sliding) the tubes principal axis. Because of the tubes transverse deformations during the tip sliding, a larger friction coefficient is found for the transverse sliding as compared to the longitudinal sliding. Here, we show that the friction anisotropy in BN-NTs, defined as the ratio between transverse and longitudinal friction forces per unit area, increases with the nanotubesubstrate contact area, estimated to be proportional to (L NTRR NT) 1/2, where L NT and R NT are the length and the radius of the nanotube, respectively. Larger contact area denotes stronger surface adhesion, resulting in a longitudinal friction coefficient closer to the value expected in the absence of transverse deformations. Compared to carbon nanotubes (C-NTs), BN-NTs display a friction coefficient in each sliding direction with intermediate values between CVD and arc discharge C-NTs. CVD BN-NTs with improved tribological properties and higher oxidation temperature might be a better candidate than CVD C-NTs for applications in extreme environments.

出版狀態已發佈 - 2012 11月 16

ASJC Scopus subject areas

  • 生物工程
  • 一般化學
  • 一般材料科學
  • 材料力學
  • 機械工業
  • 電氣與電子工程


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