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Measurement of Flexural Rigidity of Multi-Walled Carbon Nanotubes by Dynamic Scanning Electron Microscopy

1
Federal Institute for Materials Research and Testing (BAM), D-12205 Berlin, Germany
2
Federal Institute for Occupational Safety and Health (BAuA), D-10317 Berlin, Germany
3
Technical University Berlin, Center for Electron Microscopy (ZELMI), D-10623 Berlin, Germany
*
Author to whom correspondence should be addressed.
Fibers 2020, 8(5), 31; https://doi.org/10.3390/fib8050031
Received: 1 April 2020 / Revised: 19 April 2020 / Accepted: 30 April 2020 / Published: 12 May 2020
In this work the flexural rigidity of individual large diameter multi-walled carbon nanotubes (MWCNTs) was investigated. The bending modulus were obtained by detecting the resonance frequencies of mechanically excited cantilevered carbon nanotubes using the so-called dynamic scanning electron microscopy technique, and applying the Euler–Bernoulli beam theory. For the nanotubes studied, we determined a modulus of up to 160 GPa. This agrees with values reported by other authors for MWCNTs produced by catalytic chemical vapor deposition, however, it is 6-8 times smaller than values reported for single and multi-walled carbon nanotubes produced by arc-discharge synthesis. Toxicological studies with carbon nanotubes have been showing that inhaled airborne nanofibers that reach the deep airways of the respiratory system may lead to serious, asbestos-like lung diseases. These studies suggested that their toxicity critically depends on the fiber flexural rigidity, with high rigidity causing cell lesions. To complement the correlation between observed toxicological effects and fiber rigidities, reliable and routinely applicable measurement techniques for the flexural rigidity of nanofibers are required. View Full-Text
Keywords: flexural rigidity; bending modulus; resonance frequency; carbon nanotubes; MWCNTs; fiber toxicology flexural rigidity; bending modulus; resonance frequency; carbon nanotubes; MWCNTs; fiber toxicology
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MDPI and ACS Style

Fortini, R.; Meyer-Plath, A.; Kehren, D.; Gernert, U.; Jácome, L.A.; Sturm, H. Measurement of Flexural Rigidity of Multi-Walled Carbon Nanotubes by Dynamic Scanning Electron Microscopy. Fibers 2020, 8, 31. https://doi.org/10.3390/fib8050031

AMA Style

Fortini R, Meyer-Plath A, Kehren D, Gernert U, Jácome LA, Sturm H. Measurement of Flexural Rigidity of Multi-Walled Carbon Nanotubes by Dynamic Scanning Electron Microscopy. Fibers. 2020; 8(5):31. https://doi.org/10.3390/fib8050031

Chicago/Turabian Style

Fortini, Renata, Asmus Meyer-Plath, Dominic Kehren, Ulrich Gernert, Leonardo A. Jácome, and Heinz Sturm. 2020. "Measurement of Flexural Rigidity of Multi-Walled Carbon Nanotubes by Dynamic Scanning Electron Microscopy" Fibers 8, no. 5: 31. https://doi.org/10.3390/fib8050031

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