Variation in chemical, colloidal and electrochemical properties of carbon nanotubes with the degree of carboxylation

Document Type

Article

Publication Date

1-1-2017

Abstract

Multiwalled carbon nanotubes (CNTs) were carboxylated via microwave irradiation where the treatment time was varied to alter the degree of functionalization, and as many as one in 15 carbons in the CNT could be oxidized. Chemical, physical, electrochemical, and colloidal behavior of the carboxylated CNTs was studied. All properties changed with the degree of functionalization to a point beyond which they appeared to remain constant. The surface area increased from 173.9 to 270.9 m2/g while the critical coagulation concentration (CCC) values increased from 142.14 to 168.69 mM in the presence of NaCl, and the corresponding increase was from 0.97 to 5.32 mM in the presence of MgCl2. As seen from cyclic voltammetry curves, the functionalized CNTs showed mainly non-Faradic interactions with Na2SO4, but showed Faradic behaviors in alkaline KOH.

Identifier

85008884589 (Scopus)

Publication Title

Journal of Nanoparticle Research

External Full Text Location

https://doi.org/10.1007/s11051-016-3697-2

e-ISSN

1572896X

ISSN

13880764

Issue

1

Volume

19

Grant

R01ES023209

Fund Ref

National Institute of Environmental Health Sciences

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