Determination of the acidic sites of purified single-walled carbon nanotubes by acid–base titration

By Hui Hu, Paragranjita Bhowmik, Bin Zhao, M. A. Hamon, M. Itkis, R. Haddon. 2001

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Measurement of functionalised carbon nanotube carboxylic acid groups using a simple chemical process (2006, background): “Previous studies [15,17] have shown that COOH groups are at the ends of oxidised SWNTs, and Hu et al.”
Low percolation threshold in single-walled carbon nanotube/high density polyethylene composites prepared by melt processing technique (2006, background): “An active group such as carboxylic acid or a polymer is introduced onto the surface of CNTs [8–15].”
Carbon nanotubes, science and technology part (I) structure, synthesis and characterisation (2012, background): “And, although purification methods increase the fraction of CNTs in the sample, it also modifies the CNT themselves: it may open both or one on CNT ends, reduced length, modify functional groups, and sometimes it cause defects (Hu et al., 2001; Mawhinney et al., 2000).”
POLYMER NANOCOMPOSITES BASED ON FUNCTIONALIZED CARBON NANOTUBES (2010, methodology): “Acid base titration method [57] was used to determine that the percentage of acidic sites of purified SWNTs was about 1–3%.”