Search results for "Fractal nature"

showing 2 items of 2 documents

Porous fractal gels: secondary effects in SEC

1992

Abstract The fractal nature of porous silica gels, Spherosil XOA 200 and of a Lichrospher mixture, has been tested through size exclusion chromatography of polystyrene in pure and mixed eluents. Fractal parameters, D f and L , depend on eluent with D f values close to 2.0 for Spherosil and higher than 2.0 for Lichrospher. D f and L changes with eluent have been related to secondary separation effects and partition and adsorption contributions have been evaluated.

ChromatographyChemistrySize-exclusion chromatographyAnalytical chemistryCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsFractal naturechemistry.chemical_compoundAdsorptionFractalColumn chromatographyMaterials ChemistryCeramics and CompositesPartition (number theory)PolystyrenePorosityJournal of Non-Crystalline Solids
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Standardisation, Reference Materials and Comparative Measurements for Surface Area and Pore Characterisation

1991

Summary This paper reviews current activities to standardise measuring procedures for surface area and pore size determination. Comparative measurements at different laboratories using candidate reference materials revealed that surfaces of highly dispersed materials can be affected remarkably during storing and sample preparation. On account of the fractal nature of these materials, the results depend on the measuring methods. Reference materials of dispersed materials are offered by national and international standardisation administrations and by industrial distributers. The standardisation of measuring methods becomes more and more international (ISO, IUPAC). The survey includes tables …

Surface (mathematics)Pore sizeFractal natureMaterials scienceNanotechnologySample preparation
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