Details

Autor(en) / Beteiligte

• Shtein, Michael
• Pri-bar, Ilan
• Regev, Oren

Titel

A simple solution for the determination of pristine carbon nanotube concentrationElectronic supplementary information (ESI) available. See DOI: 10.1039/c2an36399b

Erscheinungsjahr

2013-02

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Upon dispersant-assisted exfoliation, pristine carbon nanotubes (CNTs) are divided between the supernatant and precipitate, which makes the determination of dispersant concentration a challenging task. We have developed a thermogravimetric-spectroscopy-based approach to accurately determine the dispersant-assisted CNT (or nanoparticles, in general) concentration in dispersion. A thermogravimetric analysis of the filtered and washed precipitate, that is usually discarded after centrifugation, is used here to accurately calculate the CNT mass in the precipitate and (through mass-balance) its mass in the supernatant. Once the true CNT concentration has been determined, a conventional spectroscopy-based concentration calibration plot is constructed for simple and swift use in further concentration measurements. Such true concentration analysis is crucial for studying the concentration-property relationship. An accurate method for determining the carbon nanotube (CNT) concentration in the supernatant via precipitate analysis was developed, overcoming limitations in presently used techniques.