C60 Oxide as a Key Component of Aqueous C60 Colloidal Suspensions
| Autor: | Rangika S. Hikkaduwa Koralege, Satish I. Kuriyavar, Martha E Hilburn, Randall D Maples, Befrika S. Murdianti, Joshua Damron, Kevin D. Ausman |
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| Rok vydání: | 2012 |
| Předmět: |
Light
Absorption spectroscopy Inorganic chemistry Oxide Suspension (chemistry) Sonication chemistry.chemical_compound Colloid Ozone Suspensions Scattering Radiation Environmental Chemistry Ultrasonics Colloids Particle Size Chromatography High Pressure Liquid Aqueous solution Air Spectrum Analysis Water General Chemistry Toluene Kinetics chemistry Fullerenes Particle size Derivative (chemistry) |
| Zdroj: | Environmental Science & Technology. 46:7446-7453 |
| ISSN: | 1520-5851 0013-936X |
| Popis: | Stable aqueous fullerene colloidal suspensions (nC(60)) are demonstrated to rely on the [6,6]-closed epoxide derivative of the fullerene (C(60)O) for stability. This derivative is present, though often unrecognized, in small quantities in nearly all C(60) starting materials due to a reaction with air. The low-yield formation of nC(60) from organic solvent solutions results from a preferential partitioning and thus enrichment of C(60)O in the colloidal particles. This partitioning is significantly retarded in the nC(60) synthesis method that does not involve organic solvent solutions: long-term stirring in water. Instead, this method relies on trace levels of ozone in the ambient atmosphere to produce sufficient C(60)O at the surfaces of the nC(60) particles to allow stable suspension in water. Controlled-atmosphere syntheses, deliberate C(60)O enrichment, light scattering measurements, and extraction followed by HPLC analysis and UV-visible absorption spectroscopy support the above model of nC(60) formation and stabilization. |
| Databáze: | OpenAIRE |
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