Unexpected Behavior of Streaming Potential in Ion-Exchange Membranes

Wouter Badenhorst, Kuldeep, Jose Antonio Manzanares, Lasse Murtomäki*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
18 Downloads (Pure)

Abstract

Streaming potential is one of the numerous electrokinetic phenomena created when an electrolyte flows along a charged surface. In membranes, applying the charged cylindrical pore model, streaming potential can be used to estimate, e.g., the pore size and the charge density of such pores. In this study, we are extending streaming potential experiments to ion-exchange membranes (IEMs) and trying to verify the existing models with the measurements. According to the Donnan equilibrium between an electrolyte solution and an IEM, the solution concentration should not affect the streaming potential if the membrane charge is even moderately low. Yet, the streaming potential varied substantially with the solution concentration, as in the case of nearly neutral porous membranes. In addition, the existing theory does not include the membrane thickness, but we found that thinner membranes showed larger streaming potentials. These dilemmas are discussed in this paper.

Original languageEnglish
Pages (from-to)7512–7519
JournalLangmuir
Volume40
Issue number14
Early online date25 Mar 2024
DOIs
Publication statusPublished - 9 Apr 2024
MoE publication typeA1 Journal article-refereed

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