Investigadors del NIST desenvolupen un nou mètode per a determinar la qualitat dels nanotubs del carbó
Investigadors del National Institute of Standards and Technology (NIST) han desenvolupat un nou mètode sensible per a determinar ràpidament la qualitat dels nanotubs del carbó. Les proves inicials de viabilitat demostren que el mètode no només és més ràpid que la tècnica analítica estàndard, sinó que és molt més eficaç i detecta millor la viabilitat de la mostra.
Els Investigadors del NIST han investigat amb dotzenes de mostres, han comparat els resultats del nou mètode amb els de la tècnica, han fet un anàlisi termogravimètric i han confirmat els resultats amb un electro-microscopi d'exploració. Ambdós mètodes revelen que les mostres contenien grans quantitats de carbó amorfe així com partícules residuals del metall. Ara bé, el mètode del cristal·lí del quars podria obtenir resultats de micrograms de material, comparat amb els mili-grams per a l'anàlisi termogravimètric.
Tot i les diferències entre les mostres del nanotub poden semblar subtils, poden afectar a la viabilitat del producte perquè inclús les variacions més petites en la composició del material poden afectar al comportament elèctric i termal.
Els científics del NIST van realitzar les proves amb l'ajuda d'estudiants de la Universitat de Colorado i de l'Institut Politècnic de Rensselaer de Nova York.
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