TY - JOUR
T1 - Variation in chemical, colloidal and electrochemical properties of carbon nanotubes with the degree of carboxylation
AU - Wu, Zheqiong
AU - Wang, Zhiqian
AU - Yu, Fang
AU - Thakkar, Megha
AU - Mitra, Somenath
N1 - Funding Information:
This study was funded by the National Institute of Environmental Health Sciences (NIEHS) (Grant Number R01ES023209). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author (s) and do not necessarily reflect the views of NIEHS.
Publisher Copyright:
© 2017, Springer Science+Business Media Dordrecht.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - 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.
AB - 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.
KW - Carbon nanotubes
KW - Colloidal stability
KW - Degree of functionalization
KW - Electrochemical property
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U2 - 10.1007/s11051-016-3697-2
DO - 10.1007/s11051-016-3697-2
M3 - Article
AN - SCOPUS:85008884589
SN - 1388-0764
VL - 19
JO - Journal of Nanoparticle Research
JF - Journal of Nanoparticle Research
IS - 1
M1 - 16
ER -