Self-Regulated Ion Permeation through Extraction Membranes

Separation of rare earth compounds from water into an organic phase in practical cases requires the use of specific ion binding ligands in high concentrations, that form a blocking layer above an ion concentration threshold, experimentally characterized. 

(Equipe LNER) 

These tend to form complex liquid crystalline phases preferentially at ion-rich locations inside a pertraction membrane. They form a blocking layer above an ion concentration threshold, which is experimentally characterized. It is shown to limit the flux through the membrane in a pertraction system. This feedback leads to a stationary membrane permeation rate that can be modeled-without any free parameters in very good agreement with experiment. 

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Duhamet J., Mohwald H., Pleines, M. and Zemb, T.  Langmuir 33(38), 9873 (2017)