Nanofiltration Membrane Performance Of Layer-By-Layer Membranes With Different Polyelectrolyte Concentrations

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Nanofiltration membranes produced with polyelectrolytes via the layer-by-layer technique are frequently researched, but misunderstood parameter is the polyelectrolyte concentration. Higher polyelectrolyte (PE) concentrations are known to produce thicker PE layers, but its effect on the membrane performance has only been studied in a limited fashion, leading to premature conclusions. In this work, two well-known strong polyelectrolytes, PDADMAC and PSS were used to prepare membranes using coating solutions with poly-electrolyte concentrations of 0.01, 0.1, 1.0, 2.5 and 5.0 wt% and two different salt concentrations in the coating solution of 0.05 and 1 M, as higher salt concentrations lead to thicker PE layers.


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