Length reduction of multi-walled carbon nanotubes via high energy ultrasonication and its effect on their dispersibility

Zheqiong Wu, Somenath Mitra

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Length dependent dispersibility of carboxylated multiwalled carbon nanotubes is presented using a novel approach that ensures the same diameter and the degree of functionalization. The longer multiwalled nanotubes were reduced in length by ultrasonication and then their dispersibility was studied in comparison to the original tubes. Colloidal studies showed dependence on the length where the shorter tubes showed higher aggregation in terms of larger particle size, zeta potential and lower critical coagulation concentrations in the presence of electrolytes. It is hypothesized that the longer tubes entangled more leading to a more complex electrostatic double layer that increased their stability.

Original languageEnglish (US)
Article number2563
JournalJournal of Nanoparticle Research
Volume16
Issue number8
DOIs
StatePublished - Aug 2014

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • Carbon nanotubes
  • Colloidal stability
  • Dispersibility
  • Length reduction
  • Ultrasonication

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