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Thin-layer chromatography in the investigation of polystyrene macromolecule interaction with nanoporous silica

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Abstract

The behavior of polystyrene macromolecules in nanopores of silica (silica gel, silochrome, MPS porous glass) is studied by a method of thin-layer chromatography. Tetrahydrofuran (THF) and a mixture of benzene with cyclohexane are used as solvents in this work. The relative coefficient of retardation (capacity coefficient) k′ and the distribution coefficient of polystyrene macromolecules between two phases K p are calculated from R f values. THF elution is characterized by a negative adsorption of polystyrenes because of preferential adsorption of solvent molecules and different availability of sorbent pore volume for macromolecular coils of polystyrenes. The calculated values R f > 1, k′ < 0, and K p < 1 reflect the mode of negative sieve chromatography and formation of monolayer of THF molecules adsorbed on the sorbent surface. The ratios between the retardation parameters in thin-layer and column chromatography are considered. The influence of the sorbent pore sizes and polystyrene molecular weights on the parameters of thin-layer chromatography is discussed.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071, Russia

    A. Yu. El’tekov, N. A. El’tekova & Yu. A. El’tekov

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  1. A. Yu. El’tekov
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  2. N. A. El’tekova
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  3. Yu. A. El’tekov
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Correspondence to A. Yu. El’tekov.

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Original Russian Text © A.Yu. El’tekov, N.A. El’tekova, Yu.A. El’tekov, 2014, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2014, Vol. 50, No. 1, pp. 49–52.

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El’tekov, A.Y., El’tekova, N.A. & El’tekov, Y.A. Thin-layer chromatography in the investigation of polystyrene macromolecule interaction with nanoporous silica. Prot Met Phys Chem Surf 50, 45–48 (2014). https://doi.org/10.1134/S2070205114010031

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  • DOI: https://doi.org/10.1134/S2070205114010031

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