Wetting and non-wetting fluids in surface-functionalised activated carbons

Krisztina László, Orsolya Czakkel, Erik Geissler

Research output: Contribution to journalArticle

Abstract

Pore filling by non-polar and polar molecules is investigated by small-angle X-ray scattering in activated carbons that had been surface-functionalised to different degrees by oxidation. A pseudo-binary model for the scattering response is used to trace the filling characteristics of water and n-hexane in the pore structure. While the pores are uniformly filled by n-hexane, pore filling by water is only partial. In the latter case, a significant contribution from liquid-vapour interfaces appears and the system becomes fully ternary. This feature is direct evidence of the development of water droplets, which form even in the most oxidised carbon. The appreciable differences between the carbons illustrate the influence on the small-angle X-ray scattering response of surface chemistry and of the polarity of the adsorbed molecules.

Original languageEnglish
Pages (from-to)59-65
Number of pages7
JournalColloid and Polymer Science
Volume286
Issue number1
DOIs
Publication statusPublished - Jan 1 2008

Keywords

  • Activated carbon
  • Interfacial properties
  • Small-angle X-ray scattering
  • Surface treatment

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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