Unzipping Multiwalled Carbon Nanotubes under Vortex Fluidic Continuous Flow

Thaar M.D. Alharbi, Amjad E.H. Alotaibi, Dechao Chen, Qin Li, Colin L. Raston

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Conventional batch processing in terms of unzipping multiwalled carbon nanotubes (MWCNTs) suffers from discontinuity, safety and environmental issues, reproducibility, and limited scalability. We have established a continuous-flow, scalable, and safe process for unzipping MWCNTs, achieving a yield of 75% under flow conditions, without the need for any auxiliary reagents. This involves using a mild oxidant, aqueous hydrogen peroxide, and harnessing the mechanical energy in a vortex fluidic device (VFD) while operating at ambient temperature. The physical properties of the fabricated unzipping MWCNTs were investigated by scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, powder X-ray diffraction, and Raman spectroscopy. This scalable, continuous-flow VFD-enabled fabrication method for unzipping MWCNTs unveils the power of a fluidic vortex confined in a thin film of liquid for nanocarbon structural re-formation and functionalization.

Original languageEnglish
Pages (from-to)12165–12173
Number of pages9
JournalACS Applied Nano Materials
Issue number9
Early online date29 Aug 2022
Publication statusPublished - 23 Sept 2022


  • carbon nanotubes
  • continuous flow
  • scalability
  • shear stress
  • unzipping
  • vortex fluidic device


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