Scaling in diffusive transport through membranes
โ Scribed by Z.J. Grzywna
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 943 KB
- Volume
- 51
- Category
- Article
- ISSN
- 0009-2509
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โฆ Synopsis
Scaling accounts for a sort of dependence between local (microscopic, or very small) and global (macroscopic) properties of a system in question. Fractal dimension and its generalizations, as critical exponents in a power-law scaling, have been chosen as a tool in the reconsideration of a mass transport through membranes, and in the process of casting (DLA membranes). The passage from the diffusion on the prototype structures (e.g. Sierpifiski gasket) to the diffusion on real structures has also been shown.
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Ultrafiltration membranes having electric charge, made of sulfonated polysulfone, were manufactured. Two types of membrane having charge density of 1.6 and 0.78 meq/g, and designated as Ml and M2, respectively, were used. Rejections of various molecular weight PEG were first measured by using these
## Abstract Transport rates were measured by monitoring the pressure decay between two reservoirs connected by a polyethylene membrane. The diffusion equation was integrated to obtain a relation between the pressure difference across the reservoirs and the time, with solubility, expressed by Henry'