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 thequantitative analysis of carbon nanotubes (CNTs) in biological samples still represent hugechallenges. A new technique for the quantitative and accurate detection of CNTs in variousbiological samples at different scales (whole organisms to organs) was developed usingamphibian larvae exposed to double-walled CNTs (DWCNTs). This technique is based onthe dielectric relaxation of ultra-low volume suspensions under a microwave electromagneticfield. CNT concentrations were consequently extracted from complex permittivitymeasurements at 5 GHz, making possible to quantitatively assess the animal exposure toCNTs. Our results indicate a detection threshold of 0.02 lg of DWCNTs, which is the lowestachieved in the literature to date
Domaines
MatériauxOrigine | Fichiers produits par l'(les) auteur(s) |
---|
Loading...