Encyclopedia of Membranes

2016 Edition
| Editors: Enrico Drioli, Lidietta Giorno

Use of Streaming Potential Measurements for Characterization of Both Membrane/Electrolyte Interface and Protein Fouling Effect

Reference work entry
DOI: https://doi.org/10.1007/978-3-662-44324-8_765

Electrical nature of external and internal (pore-wall) membrane surfaces is significant for salt rejection and transport characterization of RO and NF membranes or for filtration of solutions containing macromolecules and colloids. Electrokinetic measurements are usually performed for characterization of membrane/electrolyte interfaces and to estimate changes associated to membrane fouling as a result of cake layer formation (external fouling) or pore narrowing/plugging (internal fouling).

Zeta potential (ζ) is the stationary electrical potential at the shear plane between fixed and mobile ions in the double layer associated to solid-liquid charged interfaces. For weakly charged walls or wide channels/pores, ζ-potential is obtained from streaming potential coefficient (Δøst/ΔP) I = 0 by Helmholtz-Smoluchowski equation (Hunter 1988):
$$ {\upzeta}_{{\mathrm{H}}_{-}\mathrm{S}}=\left({\lambda}_{\mathrm{e}}\eta {\varepsilon}_{\mathrm{o}}\varepsilon \right){\left(\Delta \mathrm{\o st}/\Delta...
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© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Departamento de Fisica Aplicada IUniversidad de Malaga, Facultad de CienciasMalagaSpain