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Main Title: Measurement of Flexural Rigidity of Multi-Walled Carbon Nanotubes by Dynamic Scanning Electron Microscopy
Author(s): Fortini, Renata
Meyer-Plath, Asmus
Kehren, Dominic
Gernert, Ulrich
Jácome, Leonardo Agudo
Sturm, Heinz
Type: Article
Abstract: 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.
Subject(s): flexural rigidity
bending modulus
resonance frequency
carbon nanotubes
fiber toxicology
Issue Date: 12-May-2020
Date Available: 18-Nov-2020
Language Code: en
DDC Class: 530 Physik
Journal Title: Fibers
Publisher: MDPI
Volume: 8
Issue: 5
Article Number: 31
Publisher DOI: 10.3390/fib8050031
EISSN: 2079-6439
TU Affiliation(s): Zentrale & sonstige Einrichtungen » Zentraleinrichtung Elektronenmikroskopie (ZELMI)
Appears in Collections:Technische Universität Berlin » Publications

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