Year: 2009
Type: article
Abstract: The potential performance of carbon nanotubes (CNTs) as springs for elastic energy storage is evaluated. Models are used to determine an upper bound on the energy density that can be stored in defect-free individual CNTs and in assemblies of such CNTs. The models reveal that optimal energy density may be achieved in small-diameter single-walled CNTs loaded in tension, with a maximum theoretical energy density for CNT groupings of 7.8 × 10 6 kJ m −3 . Millimeter-scale CNT springs are constructed using 3 mm tall forests of multi-walled CNTs as the starting material, and tensile tests are performed to measure the springs' stiffness, strength and elastic properties. The measured strain energy density of these continuous CNT fibers is comparable to the energy density of steel springs.
Authors: F A Hill, T F Havel, A J Hart, C Livermore
Institutions: Massachusetts Institute of Technology, University of Michigan
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2131092929