Showing papers by "Paul E. Lammert published in 1999"
30 Sep 1999
TL;DR: In this article, it was shown that the maximal energetic barrier to interlayer sliding in nanoscale multi-walled carbon nanotubes is independent of the size of the system.
Abstract: Typical multiwalled carbon tubes have interlayer incommensuration both azimuthally and axially. Finite size effects then imply that the maximal energetic barrier to interlayer sliding in nanoscale multiwalled carbon nanotubes is, surprisingly, independent of the size of the system. Turning attention from post-synthesis interwall interactions to interwall fluctuations during growth, we note that certain thermal fluctuations during multiwalled nanotube growth and tapering are locked into the final structure. The thermal dispersion in the diameters of tube endcaps reveals that multiwalled nanotubes grow at temperatures much lower than the maximum plasma temperatures for the arc discharge. Finally, considering only noncatastrophic structural distortions (i.e. plastic as opposed to brittle failure under tensile load), the onset of plastic deformation in carbon nanotubes depends very strongly on the wrapping index, as can be understood from a simple model of index-dependent defect-induced lengthing of the tube.
3 citations