Nitric acid vapor phase oxidation of carbon nanotubes using Mg(NO3)2-HNO3-H2O ternary mixture is proposed as a further development and significant improvement of the method employing the sole azeotropic HNO3 solution. Based on the so-called “salt effect”, the addition of Mg(NO3)2 to HNO3-H2O solution allows varying the acid vapor concentration within a wide range, even beyond the azeotropic one (> 68 wt.%). Ternary mixture containing 20 wt.% Mg(NO3)2 and variable amount of liquid HNO3 (30 to 58 wt.%) is used for the functionalisation process, achieving nitric acid vapor concentrations in the range 25–93 wt.%. The increase of acid concentration in vapor phase produces a significant augment of the functionalisation degree and a linear increase of the concentration of carboxylic acids groups, which can be thus be simply tuned.

Highly versatile and efficient process for CNT oxidation in vapor phase by means of Mg(NO3)2-HNO3-H2O ternary mixture / Milone, C.; Piperopoulos, E.; Ansari, S.; Faggio, G.; Santangelo, S. - In: FULLERENES, NANOTUBES AND CARBON NANOSTRUCTURES. - ISSN 1536-383X. - 23:1(2015), pp. 1-5. [10.1080/1536383X.2013.858132]

Highly versatile and efficient process for CNT oxidation in vapor phase by means of Mg(NO3)2-HNO3-H2O ternary mixture

G. Faggio;Santangelo S
2015-01-01

Abstract

Nitric acid vapor phase oxidation of carbon nanotubes using Mg(NO3)2-HNO3-H2O ternary mixture is proposed as a further development and significant improvement of the method employing the sole azeotropic HNO3 solution. Based on the so-called “salt effect”, the addition of Mg(NO3)2 to HNO3-H2O solution allows varying the acid vapor concentration within a wide range, even beyond the azeotropic one (> 68 wt.%). Ternary mixture containing 20 wt.% Mg(NO3)2 and variable amount of liquid HNO3 (30 to 58 wt.%) is used for the functionalisation process, achieving nitric acid vapor concentrations in the range 25–93 wt.%. The increase of acid concentration in vapor phase produces a significant augment of the functionalisation degree and a linear increase of the concentration of carboxylic acids groups, which can be thus be simply tuned.
2015
CARBON NANOTUBES, OXIDATION, ACID NITRIC VAPOR, MULTI WALLED CARBON NANOTUBES, FUNCTIONALIZATION
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12318/2668
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