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Solute rejection of dextran by EVAL membranes with asymmetric and particulate morphologies by Liao-Ping Cheng; Hung-Yin Lin; Leo-Wang Chen; Tai-Horng Young is a Materials Science article available to read on EtoBox.

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EVAL copolymer was precipitated from water and octanol to form, respectively, asymmetric and particulate membranes in an isothermal immersion precipitation process. Permeability of these membranes was examined with respect to dextran samples of various sizes. The results indicate that asymmetric membranes reject large dextran molecules and let through small molecules for the pressure range of 0.25-0.75 kg/cm 2. The particulate membranes, however, exhibit an unusual filtration behaviour; i.e. there exists a maximum rejection at intermediate dextran molecular weight. This implies that small molecules tend to be trapped inside the nano-pores within the EVAL particles whereas large molecules travel through the tortuous channels outside the particles during a filtration operation.

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Author

Liao-Ping Cheng; Hung-Yin Lin; Leo-Wang Chen; Tai-Horng Young

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

1998

Language

EN

Field

Materials Science (Physical Sciences)