Quantitative characterization of hydrophilic-hydrophobic properties of MWNTs surfaces

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Abstract

We report the first direct measurement of surface hydrophilicity-hydrophobicity in multiwall carbon nanotubes (MWNTs) by analyzing the binary solvent adsorption excess isotherms of freshly oxidized as well as thermally annealed MWNT samples. Heat-induced changes in the sample morphology are monitored by XRD and N2 adsorption isotherms, the hydrophilic-hydrophobic surface ratio is calculated from ethanol-cyclohexane adsorption excess isotherms. The surface fractal dimension and the dimension of the capillary condensation are also determined. Results obtained from these independent methods correlate well with each other. The character of the MWNT surface gradually turns from hydrophilic (no treatment) into hydrophobic (12 h in N2 at 1673 K) upon heating. The suggested method appears to be a feasible, reliable, fast, and economic technique of characterizing MWNT surface properties.

Original languageEnglish
Pages (from-to)1656-1661
Number of pages6
JournalLangmuir
Volume20
Issue number5
DOIs
Publication statusPublished - Mar 2 2004

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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