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- W1978296175 abstract "The permeability coefficients of some metal species through selected supported liquid membranes (SLM) have been measured over extended periods of time, in the presence and absence of osmotic pressure gradients. The composition of the SLMs was varied in such a way to obtain membranes with variable interfacial properties. The interfacial tensions, viscosities, contact angles and water solubilities in the organic phases of the various liquid membranes were measured. The ability of these SLMs to transport water under the influence of osmotic pressure gradients of different magnitude was also measured. In this way correlations were established among the following factors: the lifetime of the SLMs, their interfacial and water extraction properties, the concentrations of the feed and strip solutions adjacent to the SLM and the ability of the SLM to transport water. The results of long-term operation of several types of SLMs indicate that they are relatively stable when the osmotic pressures of the feed and strip solutions are approximately equal, but become increasingly unstable as the difference between the osmotic pressures of the feed and strip solutions increases. In addition, the rate at which water is transported through the SLMs under the influence of a given osmotic pressure difference is inversely related to membrane lifetime. The following mechanism of water transport through SLMs was proposed: (i) in presence of an osmotic pressure gradient water tends to flow through the organic-filled pores of the SLM, providing the organic phase can appreciably solubilize water; this initial water flow can be imagined as the diffusion of water molecules through a stationary organic diluent; (ii) when the amount of flowing water becomes massive and the SLM is easily wetted by the aqueous phases, the organic phase is eventually displaced from the support pores and replaced by water; at this point the membrane behaves as a semipermeable diaphragm containing water-filled micropores and its ability to perform carrier-mediated coupled transport of metal species is completely lost." @default.
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- W1978296175 date "1987-05-01" @default.
- W1978296175 modified "2023-10-05" @default.
- W1978296175 title "Lifetime of supported liquid membranes: the influence of interfacial properties, chemical composition and water transport on the long-term stability of the membranes" @default.
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- W1978296175 doi "https://doi.org/10.1016/s0376-7388(00)82223-1" @default.
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