Fractionation of carboxylated carbon nanotubes and the corresponding variation in their colloidal behavior

Zheqiong Wu, Somenath Mitra

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Length dependent dispersibility of carboxylated multi-walled carbon nanotubes is presented using a novel approach where a batch of carboxylated nanotubes was size sorted via ultracentrifugation into different fractions with lengths ranging from 150 to 950 nm. The different fractions had the same tube diameter and degree of oxidation. The dispersibility of the nanotube fractions showed dependence on the length where the longer tubes showed more aggregation in terms of larger particle size, zeta potential and lower critical coagulation concentrations (CCC) in the presence of electrolytes. It is hypothesized that the longer tubes formed a more complex electrostatic double layer that increased their entanglement and aggregation. This journal is

Original languageEnglish (US)
Pages (from-to)2295-2300
Number of pages6
JournalEnvironmental Sciences: Processes and Impacts
Volume16
Issue number10
DOIs
StatePublished - Oct 1 2014

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Public Health, Environmental and Occupational Health
  • Management, Monitoring, Policy and Law

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