Abstract
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.
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