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Studies of pore diameters in porous silica by small angle X-ray scattering and gel permeation chromatography

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  • Colloid Science
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Summary

Six types of porous silica (Porasil) have been studied by small angle X-ray scattering, gel permeation chromatography and mercury porosimetry. Values for correlation length and average pore diameter are determined from the angular intensity distribution of scattered X-rays using the method described byDebye and coworkers for an inhomogeneous system. These average pore diameters are shown to lie within the pore size distribution determined by mercury porosimetry and within the distribution of hydrodynamic diameters determined by gel permeation chromatography. Strong adsorption effects were found in gel permeation chromatography separations with some polymer-solvent systems. These effects and extensive chromatogram broadening may limit the use of GPC for determining the pore size distribution of Porasils.

Zusammenfassung

Sechs Typen poröser Kieselerde (Porasil) wurdendurch Röntgen-Kleinwinkelstreuung, Gel-Chromatographie und Quecksilber-Porositätsmessung untersucht. Korrelationslänge und Durchschnittsporendurchmesser werden von der Winkelintensitiitsverteilung gestreuter Röntgenstrahlen hermöglicherweise bestimmt nach der Methode für ein inhomogenes System, wie sieDebye und Mitarbeiter beschrieben. Diese mittleren Porendurchmesser lagen nachweislich innerhalb der Porengrößeverteilung, durch Quecksilber-Porositätsmessung bestimmt, und innerhalb der Verteilung hydrodynamischer Durchmesser, die durch Gel-Chromatographie bestimmt wurde. Starke Adsorptionseffekte wurden für Gel-Chromatographische Trennungen bei einigen Polymer-Lösungsmittel systemen gefunden. Diese Effekte und weitgehende Chromatogramm-Peak-Verbreitung begrenzen möglicherweise den Einsatz von Gel-Chromatographie zur Bestimmung der Porengrößeverteilung des Porasils.

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Author notes

  1. J. V. Dawkins

    Present address: Department of Chemistry, Loughborough University of Technology, Loughborough, Leicestershire, England

Authors and Affiliations

  1. The Heath Runcorn, Imperial Chemical Industries Ltd. Corporate Laboratory, P.O. Box 11, Cheshire, England

    G. W. Longman, G. D. Wignall, M. Hemming & J. V. Dawkins

Authors
  1. G. W. Longman
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  2. G. D. Wignall
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  3. M. Hemming
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  4. J. V. Dawkins
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With 10 figures and 3 tables

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Longman, G.W., Wignall, G.D., Hemming, M. et al. Studies of pore diameters in porous silica by small angle X-ray scattering and gel permeation chromatography. Colloid & Polymer Sci 252, 298–305 (1974). https://doi.org/10.1007/BF01551151

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  • DOI: https://doi.org/10.1007/BF01551151

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