Morphology and N 2 permeability of multi-wall carbon nanotube-teflon membranes

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9 Citations (Scopus)

Abstract

We prepared buckypapers with surface densities in the 1.13-5.66 mg cm -2 range by filtering multi-wall carbon nanotube (MWCNT) suspensions in acetyl-acetone (acac) and dimethylformamide (DMF) through 0.45 μm nylon filters. Filtration curves were evaluated using the Carman equation. The average resistance of the filter itself was found to be R m = 3.79-10 10 m -1 for acac and 8.49·10 10 m -1 for DMF. The specific resistance α of the filter cakes decreased with increasing film surface density from 16.1·10 12 m·kg -1 (for the 1.13 mg ·cm -2 film from DMF) to 4.38·10 12 m·kg -1 (for the 5.66 mg·cm -2 film from DMF). The effective diffusivity of N 2 at 298 K and a pressure difference of 10 mbar was also determined for all membranes and found to fall into the 1.14· 10 -9 -3.74·10 -9 m 2 · s -1 range. Both the porosity and the tortuosity of buckypapers increased with their thickness. An approx. 5 μm thick Teflon (PTFE) coating was applied to the MWCNT membranes by pulsed laser deposition. The gas permeability of the MWCNT-PTFE membranes matches that of the uncoated nanotube films. This observation is an agreement with our SEM and AFM data on porous coating morphology.

Original languageEnglish
Pages (from-to)1604-1610
Number of pages7
JournalJournal of Nanoscience and Nanotechnology
Volume7
Issue number4-5
DOIs
Publication statusPublished - Apr 1 2007

Keywords

  • Filtration
  • Gas permeability
  • Multi-wall carbon nanotubes
  • Thick films

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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