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

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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.

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Acknowledgement

The European Synchrotron Radiation Facility is gratefully acknowledged for access to the small-angle beamline BM2. We express our warm thanks to G. Bosznai and C. Rochas for their invaluable assistance. This research was supported by the EU–Hungarian Government joint fund (GVOP-3.2.2-2004-07-0006/3.0).

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Authors and Affiliations

  1. Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1521, Budapest, Hungary

    Krisztina László & Orsolya Czakkel

  2. Laboratoire de Spectrométrie Physique CNRS UMR 5588, Université J. Fourier de Grenoble, BP 87, 38402, St Martin d’Hères cedex, France

    Erik Geissler

Authors
  1. Krisztina László
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  2. Orsolya Czakkel
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  3. Erik Geissler
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Correspondence to Krisztina László.

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László, K., Czakkel, O. & Geissler, E. Wetting and non-wetting fluids in surface-functionalised activated carbons. Colloid Polym Sci 286, 59–65 (2008). https://doi.org/10.1007/s00396-007-1686-9

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  • DOI: https://doi.org/10.1007/s00396-007-1686-9

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