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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.

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Related Experiment Video

Updated: Jul 7, 2026

Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness
11:09

Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness

Published on: April 1, 2018

Dislocation dynamics in multiwalled carbon nanotubes at high temperatures.

J Y Huang1, F Ding, B I Yakobson

  • 1Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM 87185, USA. jhuang@sandia.gov

Physical Review Letters
|February 1, 2008
PubMed
Summary

Dislocations in multiwalled carbon nanotubes (MWCNTs) become mobile at high temperatures, exhibiting unique glide and climb behaviors. These dynamics differ significantly from conventional materials, impacting MWCNT mechanical properties.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid Mechanics

Background:

  • Dislocation dynamics are crucial for material mechanical properties.
  • Dislocations in crystalline materials are well-studied.
  • Dislocations in carbon nanotubes (CNTs), especially multiwalled carbon nanotubes (MWCNTs), are largely unexplored.

Purpose of the Study:

  • To investigate the behavior of dislocations in MWCNTs.
  • To characterize dislocation mobility and dynamics at high temperatures.
  • To compare dislocation behavior in MWCNTs with conventional crystalline materials.

Main Methods:

  • High-temperature experiments on MWCNTs.
  • Characterization of dislocation glide, climb, and interactions.
  • Analysis of dislocation loop formation and mass transport.

Main Results:

  • A room temperature sessile dislocation in MWCNTs becomes highly mobile at ~2000°C.
  • Observed dislocation glide, climb, and glide-climb interactions.
  • Dislocation glide causes shell cross-linking; climb forms nanocracks; interactions create kinks.
  • Dislocation loops serve as channels for mass transport.

Conclusions:

  • Dislocation dynamics in MWCNTs are distinct from conventional materials due to their unique structure.
  • High-temperature dislocation mobility significantly influences MWCNT properties.
  • Understanding these dynamics is key for advanced material applications.