Influence of flow and charge transfer inside membranes on measurements of membrane zeta potential
Measurements of zeta potential of membranes is usually treated based on Smoluchowski equation. However, in the case of membranes with sufficiently high porosity and permeability it is necessary to introduce a correction taking into account the influence of the fluid flow and charge transfer inside t...
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Published in | Journal of molecular liquids Vol. 323; p. 114865 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.02.2021
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Subjects | |
Online Access | Get full text |
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Summary: | Measurements of zeta potential of membranes is usually treated based on Smoluchowski equation. However, in the case of membranes with sufficiently high porosity and permeability it is necessary to introduce a correction taking into account the influence of the fluid flow and charge transfer inside the membrane itself and its influence of measurements of the zeta potential. Equations for calculations of modified zeta potential were deduced for both cases of measurements of streaming potential and streaming current considering flow and charge transfer inside the membrane.
•Equations for zeta potential were deduced in cases of streaming potential or current.•High porosity and permeability affect measurements of the membrane zeta potential.•Fluid flow and charge transfer inside the membrane should be considered.•Neglecting these effects lead to significant errors in electrokinetic measurements.•Extremum dependency of membrane zeta potential on porosity is established. |
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ISSN: | 0167-7322 1873-3166 |
DOI: | 10.1016/j.molliq.2020.114865 |