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(ii). Organic Systems:

1.  Solution phase ozonolysis of carbon nanotubes for (a) purification and removal of metal impurities and amorphous carbon. (b) Sidewall functionalization (1,3-dipolar cycloaddition) of tubes. (c) Evidence that ozonolysis is selective for reaction with smaller-diameter tubes. (d) Rational control of oxygenated group density and distribution on sidewalls. Protocol presented a nondestructive, low-temperature, diameter-selective method for introducing oxygenated moieties onto nanotube sidewalls, with implications for the design of well-dispersed nanotube-based composites. Ozonized tubes are also potential energy storage devices.

Refs.:  J. Phys. Chem. Bv.106, 12144 (2002);  Nano Lett.,  v.4, 1445 (2004);  J. Mater. Chem. (cover),  v.16, 141 (2006);  Chem. Phys. Lett.,  v.442, 354 (2007); and  J. Coll. Interf. Sci.,  v.317, 375 (2008).   

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2.  Organic derivatization  of carbon nanotubes with crown ethers to increase the solubility of carbon nanotubes in wide range of aqueous and organic solvents (up to as much as 1 g/L from a nominal value of 10 mg/L for unprocessed tubes). Noncovalent, nondestructive functionalization technique for controllably modifying and solubilizing virtually any type of nanotube.

Ref.:   Nano Lett .,  v.2 , 1215 (2002).

 

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