The maintained interstitials in twisted carbon nanotube bundles under bending deformation

B Goh and J Choi, CELL REPORTS PHYSICAL SCIENCE, 6, 102443 (2025).

DOI: 10.1016/j.xcrp.2025.102443

The bending of twisted multi-walled carbon nanotube (MWCNT) bundles is vital for enhancing the electrochemical performance of medical implants, yet the underlying mechanics are not fully understood. Here, we report the bending behavior of micrometer-scale MWCNT bundles using a specialized coarse-grained model designed for densely packed, highly aligned MWCNT bundles. We reveal that radial gradients of bias angle of the interior bundle are crucial for maintaining its structure during bending. A straightforward mapping technique is proposed to monitor changes in the interstitial surface during bending by tracking coarse- grained particle density. This study lays the groundwork for designing stronger, more efficient MWCNT bundles for medical devices that must perform reliably in the dynamic environment of the body.

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