Quantitative detection of carbon nanotubes in biological samples by an original method based on microwave permittivity measurements
Résumé
Due to their nanoscale, morphology, and chemical composition, the tracking and the
quantitative analysis of carbon nanotubes (CNTs) in biological samples still represent huge
challenges. A new technique for the quantitative and accurate detection of CNTs in various
biological samples at different scales (whole organisms to organs) was developed using
amphibian larvae exposed to double-walled CNTs (DWCNTs). This technique is based on
the dielectric relaxation of ultra-low volume suspensions under a microwave electromagnetic
field. CNT concentrations were consequently extracted from complex permittivity
measurements at 5 GHz, making possible to quantitatively assess the animal exposure to
CNTs. Our results indicate a detection threshold of 0.02 lg of DWCNTs, which is the lowest
achieved in the literature to date
Domaines
MatériauxOrigine | Fichiers produits par l'(les) auteur(s) |
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