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- W2045055182 abstract "Streaming potential measurements can beperformed in two different ways: by flowthrough the membrane pores (transmembranestreaming potential) or by flow across the topsurface of the membrane (tangential streamingpotential, TSP). The se cond procedure is usuallyused for the characterisation of asymmetric orcomposite membranes because it has the advan-tage of avoiding undesirable effects such as thecontribution of both supporting layer(s) to themeasured signal and the membrane potentialinduced by the concentration difference acrossthe active layer. Up to now the tangential tech-nique was applied to flat membranes but notto mono- or multi-channels tubular membranesprobably due to the largeness of channels insidewhich the solution flows. Indeed, in these condi-tions, the flow becomes rapidly turbulent andthe classical Hagen-Poiseuille equation cannotbe used anymore in the derivation of the stream-ing current expression. Although the flow is notwholly laminar, it is show n that the electrokinet-ics theory can be used to convert TSP data intoz-potentials provided that the electrical doublelayer lies within a laminar sublayer near thechannel walls. In this study, we present and test an electro-kinetic setup for the determination of z-potentialof tubular membranes from tangential streamingpotential measurements under conditions of tur-bulent flow. The study was performed with athree-channels tubular membrane close to theNF range over a range of pH. z-potentials deter-mined by combining TSP with electrical con-ductance measurements were compared withthose calculated from the classical Helmholtz–Smoluchowski (H–S) equation." @default.
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- W2045055182 date "2006-11-01" @default.
- W2045055182 modified "2023-09-27" @default.
- W2045055182 title "Characterisation of microporous tubular membranes by tangential streaming potential" @default.
- W2045055182 cites W1984696430 @default.
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- W2045055182 doi "https://doi.org/10.1016/j.desal.2006.03.289" @default.
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