The influence of oxygen-containing functional groups on the dispersion of single-walled carbon nanotubes in amide solvents

Surface composition plays an important role in carbon nanotube dispersibility in different environments. Indeed, it determines the choice of dispersion medium. In this paper the effect of oxidation on the dispersion of HiPCO single-walled carbon nanotubes (SWNTs) in N-methyl-pyrrolidinone (NMP), N,N...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2010-08, Vol.22 (33), p.334222-334222
Main Authors: Brandão, S D F, Andrada, D, Mesquita, A F, Santos, A P, Gorgulho, H F, Paniago, R, Pimenta, M A, Fantini, C, Furtado, C A
Format: Article
Language:English
Subjects:
Absorption coefficient
Amides - chemistry
CHP
Colloids - chemistry
Condensed matter
Dispersions
Hydrogen bonding
Macromolecular Substances - chemistry
Materials Testing
Molecular Conformation
Nanotubes, Carbon - chemistry
Nanotubes, Carbon - ultrastructure
Oxidation
Oxygen - chemistry
Particle Size
Single wall carbon nanotubes
Solvents
Solvents - chemistry
Surface Properties
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Summary:Surface composition plays an important role in carbon nanotube dispersibility in different environments. Indeed, it determines the choice of dispersion medium. In this paper the effect of oxidation on the dispersion of HiPCO single-walled carbon nanotubes (SWNTs) in N-methyl-pyrrolidinone (NMP), N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMA), N-dodecyl-pyrrolidinone (N12P) and cyclohexyl-pyrrolidinone (CHP) was systematically studied. During the oxidation process, similar amounts of carboxylic acid and phenolic groups were introduced to mostly already existing defects. For each solvent the dispersion limits and the absorption coefficients were estimated by optical absorption analysis over a range of SWNT concentrations. The presence of acid oxygenated groups increased SWNT dispersibility in NMP, DMF and DMA, but decreased in N12P and CHP. The absorption coefficients, however, decreased for all solvents after oxidation, reflecting the weakening of the effective transition dipole of the π-π transition with even limited extension functionalization and solvent interaction. The analysis of the results in terms of Hansen and Flory-Huggins solubility parameters evidenced the influence of dipolar interactions and hydrogen bonding on the dispersibility of oxidized SWNTs.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/22/33/334222