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Adsorption of hexane and benzene on fluorinated silicas: The effect of the perfluoralkyl chain length

  • Physicochemical Processes at Interfaces and Surfaces
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Abstract

By means of the gas chromatography and a static adsorption method, the extent of fluorination of the carrier surface, determined by the length of the grafted radical chain, affects the adsorption properties of silicas with perfluorohexyl, perfluoropropyl, and trifluoromethyl coatings. The analysis of data on the original carrier and chemically hydrophobized silicas, including a sample with grafted octyl groups used as the reference, shows that modification leads to the decrease in both the adsorption (a at 298 K and the Henry constants (K H ) in a wide temperature range for hexane and benzene. However, in contrast to silicas with perfluoropropyl or perfluorohexyl coatings, the a and K H values on trifluorometylsilica became equal (n-alkanes) or even somewhat lower (aromatic hydrocarbons) than those observed on the non-polar octylsilica surface. Irrespective of the degree of fluorination of the silica surface, the substitution and screening of silanol groups in silica lead to weakening the polarity of polyfluoroalkylsilicas as compared with the original carrier.

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Authors and Affiliations

  1. Faculty of Chemistry, Moscow State University, Vorob’evy Gory, Moscow, 119992, Russia

    T. M. Roshchina, N. K. Shoniya, A. B. Nikol’skaya & M. S. Lagutova

  2. Department of Chemistry and Biochemistry, Seton Hall University, South Orange, New Jersey, 07079, USA

    A. Yu. Fadeev

Authors
  1. T. M. Roshchina
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  2. N. K. Shoniya
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  3. A. B. Nikol’skaya
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  4. M. S. Lagutova
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  5. A. Yu. Fadeev
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Original Russian Text © T.M. Roshchina, N.K. Shoniya, A.B. Nikol’skaya, M.S. Lagutova, A.Yu. Fadeev, 2009, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2009, Vol. 45, No. 2, pp. 165–171.

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Roshchina, T.M., Shoniya, N.K., Nikol’skaya, A.B. et al. Adsorption of hexane and benzene on fluorinated silicas: The effect of the perfluoralkyl chain length. Prot Met Phys Chem Surf 45, 152–157 (2009). https://doi.org/10.1134/S207020510902004X

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  • DOI: https://doi.org/10.1134/S207020510902004X

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