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Updated: Jul 18, 2025

Introduction to Solid Supported Membrane Based Electrophysiology
Published on: May 11, 2013
Electrochemical Characterization of Charged Membranes from Different Materials and Structures via Membrane Potential
Virginia Romero1, Lourdes Gelde1, Juana Benavente1
1Departamento de Física Aplicada I, Facultad de Ciencia, Universidad de Málaga, 29071 Málaga, Spain.
Abstract:
Electrochemical characterization of positively and negatively charged membranes is performed by analyzing membrane potential values on the basis of the Teorell-Meyer-Sievers (TMS) model. This analysis allows the separate estimation of Donnan (interfacial effects) and diffusion (differences in ions transport through the membrane) contributions, and it permits the evaluation of the membrane's effective fixed charge concentration and the transport number of the ions in the membrane. Typical ion-exchange commercial membranes (AMX, Ionics or Nafion) are analyzed, though other experimental and commercial membranes, which are derived from different materials and have diverse structures (dense, swollen or nanoporous structures), are also considered. Moreover, for some membranes, changes associated with different modifications and other effects (concentration gradient or level, solution stirring, etc.) are also analyzed.
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