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SAXS Characterization of Solid/Vapor Interfaces in Polymer-Based Microporous Carbons With Different Surface Chemistry

  • Kristina László
  • Erik Geissler
Conference paper
  • 1.5k Downloads
Part of the NATO Science for Peace and Security Series C: Environmental Security book series (NAPSC)

The equilibrium adsorption of non-polar and polar molecules, n-hexane and water, in activated carbons, functionalized by oxidation with concentrated nitric acid, is investigated by small angle x-ray scattering (SAXS). As condensed fluid modifies the electronic contrast of the carbon, the resulting changes in the SAXS intensity reveal the way in which the pores are filled. Filling of the pores from the vapour or the liquid phase is found to depend both on the surface treatment and on the nature of the liquid. For n-hexane vapour at p/p0 ≈ 0.4 the dispersion interaction ensures complete filling of the narrow pores, while larger pores are unpopulated. For water vapour cluster formation and the degree of filling depend on the relative humidity and the extent of surface oxidation. At a given applied relative pressure, the pores are completely filled by n-hexane, while, at the same relative pressure, water only partially fills the pores, even in the most oxidized carbon.

Keywords: activated carbon; water vapour; adsorption; contrast variation

Keywords

Activate Carbon Pore Filling European Synchrotron Radiation Facility Zirconium Carbide Transfer Wave Vector 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media B.V 2008

Authors and Affiliations

  • Kristina László
    • 1
  • Erik Geissler
    • 2
  1. 1.Department of Physical ChemistryBudapest University of Technology and EconomicsHungary
  2. 2.Laboratoire de Spectrométrie Physique CNRS UMR 5588Université J. Fourier de GrenobleFrance

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