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Effect of End-Capping and Surface Coverage on the Mechanism of Solvent Adsorption

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Abstract

Adsorption of acetonitrile and methanol was measured on non-endcapped and endcapped octadecyl stationary phases. The results enabled us to characterize the effect of end-capping on the adsorption of the organic modifiers. Our results clearly demonstrate how the end-capping groups modify the chromatographic properties of adsorbents. Differences between solvent adsorption mechanisms are also discussed. Adsorption of acetonitrile is governed by hydrophobic effects whereas methanol is adsorbed by the organic ligand by a hydrophobic interaction and by the residual silanols by hydrogen-bond formation and dipole–dipole interactions.

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Acknowledgments

The work was supported by grants OTKA-K75717 and OTKA-NKTH NI-68863, and by Ceepus II scholarship CII-PL-0004-04-0809-M-24435. Financial support from the European Social Fund, the Polish National Budget, the Kujawsko-pomorskie Voivodship Budget (within Sectoral Operational Programme Human Resources) “Krok w przyszlosc” and “Stypendia dla doktorantow 2008/2009-ZPORR” is gratefully acknowledged. The authors thank Akzo Nobel (Bohus, Sweden) for kind donation of the Kromasil 100 silica gel used in this study.

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Correspondence to Bogusław Buszewski.

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Bocian, S., Vajda, P., Felinger, A. et al. Effect of End-Capping and Surface Coverage on the Mechanism of Solvent Adsorption. Chroma 71 (Suppl 1), 5–11 (2010). https://doi.org/10.1365/s10337-010-1522-0

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