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Surface properties of silica gel modified by trifunctional polyfluoroalkyl silanes according to data of adsorption–structural and gas chromatography studies

  • T. M. Roshchina
  • N. K. Shoniya
  • O. Ya. Tegina
  • F. Bernardoni
  • A. Y. Fadeev
Physicochemical Processes at the Interfaces
  • 38 Downloads

Abstract

Surface properties of silica gels modified by trifunctional polyfluorosilanes n-C6F13(CH2)2SiCl3 and iso-C3F7(CH2)2SiCl3 are studied using the methods of adsorption and gas chromatography with respect to nitrogen, hydrocarbon, and water molecules. It is shown that the branched structure of the grafted group and high concentration of grafted groups (2.7 nm–2) provide better screening of both residual silanols of the support and of additional hydroxyl groups formed in the course of synthesis as a result of hydrolysis. Comparison with the properties of silica gel with grafted monofunctional silane n-C6F13(CH2)2Si(CH3)2Cl shows that, in the case of an overall decrease in the adsorption values and considerable surface lyophobization, modification by trifunctional silanes irrespective of the modifier chain length allows obtaining adsorbents containing more polar centers than those in silica gel due to the possible participation in adsorption of additional silanols and a polar fragment of the grafted chain of–CH2–CF2–. A considerable difference in the course of isotherms of nitrogen and hexane adsorption–desorption is found in the range of capillary condensation hysteresis related to liophobicity of polyfluoroalkyl layers, a significant decrease in the pore wetting and the corresponding increase in wetting angle θ by hexane. Adsorption of water on fluorinated silicas is negligible and capillary condensation is not observed due to nonwettability of the pore surface by liquid adsorbate (θ > 90°).

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References

  1. 1.
    Parker, A.R. and Lawrence, Ch.R., Nature, 2001, vol. 414, p. 33.CrossRefGoogle Scholar
  2. 2.
    Tuteja, A., Choi, W., Mabry, J.M., et al., Proc. Natl. Acad. Sci. USA, vol. 105, p. 18200.Google Scholar
  3. 3.
    Kang, S.-M., Hwang, S., Jin, S.-H., et al., Langmuir, 2014, vol. 30, p. 2828.CrossRefGoogle Scholar
  4. 4.
    Ishizaki, T., Saito, N., and Takai, O., Langmuir, 2010, vol. 26, p. 8147.CrossRefGoogle Scholar
  5. 5.
    Grinthal, A., Kang, S.H., Epstein, A.K., et al., Nano Today, 2011, no. 7, p. 35.CrossRefGoogle Scholar
  6. 6.
    Khimiya privitykh poverkhnostnykh soedinenii (Chemistry of Grafted Surface Compounds), Lisichkin, G.V., Ed., Moscow: Fizmatlit, 2003.Google Scholar
  7. 7.
    Fadeev, A.Y., in Encyclopedia of Surface and Colloid Science, Somasundaran, P., Ed., New York: Taylor & Francis, 2006, p. 2854.Google Scholar
  8. 8.
    Muidinov, M.R., Ross. Khim. Zh., 2002, vol. 46, p. 64Google Scholar
  9. 8a.
    Muidinov, M.R., Ross. Khim. Zh., 2008, vol. 52, p. 81.Google Scholar
  10. 9.
    Darmanin, T., Tarrade, J., Celia, E., and Guittard, F., J. Phys. Chem., 2014, vol. 118, p. 2052.Google Scholar
  11. 10.
    Bernardoni, F. and Fadeev, A.Y., J. Colloid Interface Sci., 2011, vol. 356, p. 690.CrossRefGoogle Scholar
  12. 11.
    Kudryavtsev, G.V. and Staroverov, S.M., Zh. Vses. Khim. O-va im. D. I. Mendeleeva, 1989, vol. 34, p. 308.Google Scholar
  13. 12.
    Duchet, J., Chabert, B., Chapel, J.P., et al., Langmuir, 1997, vol. 13, p. 2271.CrossRefGoogle Scholar
  14. 13.
    Kiselev, A.V., Mezhmolekulyarnye vzaimodeistviya v adsorbtsii i khromatografii (Intermolecular Interactions in Adsorption and Chromatography), Moscow: Vysshaya Shkola, 1986.Google Scholar
  15. 14.
    Kiselev, A.V., Lisichkin, G.V., Nikitin, Yu.S., et al., Zh. Fiz. Khim., 1983, vol. 57, p. 1829.Google Scholar
  16. 15.
    Gurevich, K.B., Roshchina, T.M., Shonia, N.K., et al., J. Colloid Interface Sci., 2002, vol. 254, p. 39.CrossRefGoogle Scholar
  17. 16.
    Tarasevich, Yu.I., Polyakov, V.E., Serdan, A.A., and Lisichkin, G.V., Colloid J., 2005, vol. 67, no. 5, pp. 638–643.CrossRefGoogle Scholar
  18. 17.
    Roshchina, T. M., Shoniya, N.K., Tayakina, O. Ya., et al., Prot. Met. Phys. Chem. Surf., 2014, vol. 50, no. 3, pp. 304–311.CrossRefGoogle Scholar
  19. 18.
    Roshchina, T.M., Shoniya, N.K., Tayakina, O.Ya., et al., Russ. J. Phys. Chem. A, 2012, vol. 86, no. 3, pp. 437–446.CrossRefGoogle Scholar
  20. 19.
    Greg, S. and Sing, K., Adsorption, Surface Area and Porosity, New York: Academic Press, 1982.Google Scholar
  21. 20.
    Eksperimental'nye metody v adsorbtsii i molekulyarnoi khromatografii (Experimental Methods in Adsorption and Molecular Chromatography), Nikitin, Yu.S. and Petrova, R.S., Eds., Moscow: Moscow State Univ., 1990.Google Scholar
  22. 21.
    Touhara, H. and Okino, F., Carbon, 2000, vol. 38, no. 2, p. 241.CrossRefGoogle Scholar
  23. 22.
    Monde, T., Nakayama, N., Yano, K., et al., J. Colloid Interface Sci., 1997, vol. 185, p. 111.CrossRefGoogle Scholar
  24. 23.
    Roshchina, T.M., Gurevich, K.B., Fadeev, A.Y., et al., J. Chromatogr. A, 1999, vol. 844, p. 225.CrossRefGoogle Scholar
  25. 24.
    Karnaukhov, A.P., Adsorbtsiya. Tekstura dispersnykh i poristykh materialov (Adsorption. Texture of Dispersed and Porous Materials), Novosibirsk: Nauka, 1999.Google Scholar
  26. 25.
    Avgul', N.N., Berezin, G.I., Kiselev, A.V., and Lygina, I.A., Izv. Akad. Nauk SSSR, Otd. Khim. Nauk, 1957, p. 1051.Google Scholar
  27. 26.
    Zefirov, Yu.V. and Zorkii, P.M., Usp. Khim., 1995, vol. 64, p. 446.CrossRefGoogle Scholar
  28. 27.
    Roshchina, T.M., Shoniya, N.K., Bernardoni F., and Fadeev A.Y., Langmuir, 2014, vol. 30, p. 9355.CrossRefGoogle Scholar
  29. 28.
    Roshchina, T.M., Shoniya, N.K., Lagutova, M.S., and Fadeev, A.Yu., Russ. J. Phys. Chem. A, 2008, vol. 82, no. 3, p. 390.Google Scholar
  30. 29.
    Roshchina, T.M., Shoniya, N.K., Tayakina, O.Ya., and Fadeev, A.Yu., Russ. J. Phys. Chem. A, 2011, vol. 85, no. 2, p. 298.CrossRefGoogle Scholar
  31. 30.
    Lopatkin, A.A., Russ. J. Phys. Chem. A, 1997, vol. 71, no. 5, p. 811.Google Scholar
  32. 31.
    Handbuch der Gaschromatographie, Leibnitz, E. and Struppe, H.G., Eds., Leipzig: Akademische Verlagsgesellschaft Geest&Portig, 1966.Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • T. M. Roshchina
    • 1
  • N. K. Shoniya
    • 1
  • O. Ya. Tegina
    • 1
  • F. Bernardoni
    • 2
  • A. Y. Fadeev
    • 2
  1. 1.Moscow State UniversityChemistry FacultyMoscowRussia
  2. 2.Department of Chemistry and BiochemistrySeton Hall UniversitySouth Orange, New JerseyUSA

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