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Surfacial, liquid sorption and monolayer-forming properties of hydrophilic and hydrophobic Stöber silica particles

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Abstract

The surface of silica spheres with a diameter of 500 nm was modified with ethoxysilane. Hydrophilic and partially hydrophobic silica spheres were obtained, suitable for the preparation of two-dimensional monoparticle films at the liquid-air interface. The tendency of these particles to self-assemble is basically dependent on surface hydrophobicity. Liquid sorption excess isotherms were studied in ethanol-cyclohexane and ethanol-chloroform mixtures with the aim of characterizing the adsorption capacity of the particles. Specific surface area and porosity were measured by nitrogen adsorption. The specific surface area determined by liquid sorption was considerably larger than determined by gas adsorption. This is ascribed to penetration of ethanol into the pores and the swelling of the silica particles in ethanol. Surface modification of hydrophilic particles changed the film-forming properties of the particles. The compressibility and the lift-off area of the monolayer films of hydrophobic particles on water were higher than for the films of hydrophilic particles.

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Acknowledgements

The authors wish to thank for the financial support of Hungarian National Scientific Fund OTKA T 034430 and the Hungarian-Flemish Bilateral Scientific Program (TéT B-6/00).

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  1. Imre Dékány

    Present address: Nanostructured Materials Research Group of the Hungarian Academy Science, Aradi Vt. 1., 6720 Szeged, Hungary, e-mail: i.dekany@chem.u-szeged.hu, Fax: +36-62-544-042

Authors and Affiliations

  1. Department of Colloid Chemistry, University of Szeged, Aradi Vt. 1., 6720, Szeged, Hungary

    Imre Dékány, József Németh & Márta Szekeres

  2. Centrum voor Oppervlaktechemie en Katalyse, Katholieke Universiteit Leuven, Kasteelpark, Arenberg 23, 3001, Leuven, Belgium

    Robert Schoonheydt

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  1. Imre Dékány
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  2. József Németh
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Dékány, I., Németh, J., Szekeres, M. et al. Surfacial, liquid sorption and monolayer-forming properties of hydrophilic and hydrophobic Stöber silica particles. Colloid Polym Sci 282, 1–6 (2003). https://doi.org/10.1007/s00396-003-0930-1

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  • DOI: https://doi.org/10.1007/s00396-003-0930-1

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