Abstract
Osmotic water flow, giving the filtration coefficient, and the diffusion of isotopic water were measured in a number or membranes. It is shown that the ratio, g, between osmotic and self-diffusion flux, observed under forces of equal magnitude, may serve as a measure for the mutual interaction between water molecules penetrating the membrane, as compared to the interaction with the membrane constituents. High values were found for g in porous films. In liquid membranes, g is small but does not equal unity. Hence, in diffusion of water through these organic liquids, water-water interactions are of the same order as water-solvent interactions. In one polymer membrane, polyethylacrylate, g is close to one, as would be expected for molecular diffusion in dilute solulion. In cellulose acetate films, g is only slightly higher than in an analogous liquid membrane (triacetine) indicating that here water transport is essentially diffusion in a homogeneous phase.
Original language | English |
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Pages (from-to) | 129-138 |
Number of pages | 10 |
Journal | Desalination |
Volume | 1 |
Issue number | 2 |
DOIs | |
State | Published - 1 Jan 1966 |
Externally published | Yes |
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering
- General Materials Science
- Water Science and Technology
- Mechanical Engineering