Title: non-crystalline membrane
Long Title: IUPAC Gold Book - non-crystalline membrane
DOI: 10.1351/goldbook.09110
Status: current

Definition
Kind of ion-selective membranes used in an ISE which is a support matrix, containing an ion exchanger (either cationic or anionic), a plasticizer solvent, and possibly an uncharged, selectivity-enhancing species, form the ion-selective membrane which is usually interposed between two aqueous solutions. The matrix can be either macroporous (e.g., poly(propylene carbonate) filter, glass frit, etc.) or microporous (e.g., “thirsty” glass or polymeric material such as \(\ce{PVC}\)) yielding with the ion-exchanger and the solvent a “solidified” homogeneous mixture.

Note
An ISE based on these membranes exhibits a response due to the presence of the selectivity-enhancing species (which exhibit an ion-exchange property) in the membrane.

Example
Solvent polymeric membrane

Related Term
- ion-selective membranes: https://goldbook.iupac.org//terms/view/09119

Source
- PAC, 2020, 92, 641. 'Terminology of Electrochemical Methods of Analysis (IUPAC Recommendations 2019)' on page 664 (https://doi.org/10.1515/pac-2018-0109)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/09110/html
- json: https://goldbook.iupac.org/terms/view/09110/json
- xml: https://goldbook.iupac.org/terms/view/09110/xml

Citation: Citation: 'non-crystalline membrane' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.09110
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Accessed: 2026-05-12T04:49:40+00:00