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- W1969131507 abstract "Abstract Cellulose acetate reverse osmosis membranes were obtained by annealing ultrafiltration membranes. To elucidate processes occurring in membranes annealed at 50, 60, 70, 80, 85, 90, 93 and 96°C, measurements of AC and DC electrical resistance of the membranes, and of the concentration potentials in both possible orientations of the active layer of the membrane towards the solutions, were used. Interpretation of values for oriented concentration potentials indicates that annealing causes two changes in the porous structure of the polymer, namely, near 70°C and above 90°C, and also that the porosity gradient in the active layer disappears. A significant relationship exists between the dependence of DC electrical resistance on the annealing temperature; and analogous dependence of the water flux through the membrane was found. The dependence of the logarithms of both types of resistance on the annealing temperature is exponential, starting from the glass transition temperature; in this range, properties of the membranes are more distinctly characterized by DC than by AC resistances. The dependence of oriented concentration potentials on the annealing temperature above 60°C is linear, but the slopes differ for the different orientations of the membranes towards the solutions. Electrochemical properties can adequately characterize the porous structure of the membranes." @default.
- W1969131507 created "2016-06-24" @default.
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- W1969131507 date "1989-01-01" @default.
- W1969131507 modified "2023-09-24" @default.
- W1969131507 title "Measurement and interpretation of concentration potentials and AC-DC resistances of annealed cellulose acetate membranes" @default.
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- W1969131507 doi "https://doi.org/10.1016/s0376-7388(00)82352-2" @default.
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