Size Exclusion Chromatography and Surface Effects in Porous Fractals

摘要: Certain porous media have been claimed to be fractals in a broad range of scales α < l L. The fractal dimension D f influences various surface effects characterized by penetration length s . If can varied (by suitable external agents) through the interval (α,L) some information on extracted. We construct tentative list physical processes leading variable : a) a) Depletion layers macromolecular solution, where molecules are repelled wall, with specific implications for size exclusion chromatography. b) Preferential adsorption one species binary mixture: whenever adsorbed molecule is larger than , excess may detect fractality. c) Capillary condensation; grain exposed vapor becomes surrounded “cocoon” liquid provided that > 2. d) Electrophoresis and electro-osmosis, electrical boundary conditions play an essential role: mobility dilute aggregate sensitive only if charge per maintained during aggregation.