Load sharing and accumulated bond fracture in ion-irradiated carbon mat for energy dissipation.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39602536.
- Also identified by DOI 10.1126/sciadv.adq3805 and PMC identifier 11601194.
- Licence recorded as CC BY-NC.
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Abstract
Multiwalled carbon nanotube (MWNT) aerogel mats were irradiated with carbon ions to explore the effect of irradiation-induced sp<sup>3</sup> bonds and sp<sup>2</sup> bond defects on ultrahigh strain rate mechanical properties. Energy dissipation was measured using a microprojectile impact test. Specific penetration energy [Formula: see text] increased strongly with irradiation with a maximum [Formula: see text] of ~26 megajoules per kilogram, over 200% higher than the previous best energy-absorbing material of pristine MWNT mats and at least an order of magnitude higher than any other material tested at the microscale. Perforation morphologies observed by electron microscopy show that a much larger network region is deformed due to sp<sup>3</sup> bond enhanced load sharing within and between tubes, while defects introduced by the radiation induce more bond, shell, and tube damage leading to strongly enhanced energy dissipation.