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Title: Physically tailoring ion fluxes by introducing foamlike structures into polymeric membranes of solid contact ion-selective electrodes
Authors: Cheong, Yi Heng
Lisak, Grzegorz
Keywords: Engineering::Environmental engineering
Issue Date: 2021
Source: Cheong, Y. H. & Lisak, G. (2021). Physically tailoring ion fluxes by introducing foamlike structures into polymeric membranes of solid contact ion-selective electrodes. ACS Sensors, 6(10), 3667-3676.
Journal: ACS Sensors 
Abstract: Transmembrane ion fluxes have earlier been identified as a source of potential instability in solid contact ion-selective electrodes (SC-ISEs). In this work, foamlike structures were intentionally introduced into a potassium-sensitive plasticized poly(vinyl chloride) ion-selective membrane (ISM) near the membrane|solid contact interface by controlling the temperature during membrane deposition. Foamlike structures in the ISM were shown to be effective at physically tailoring the transport of ions in the ion-selective membrane, greatly reducing the flux of interfering ions from the sample to the membrane|solid contact interface. The drifts during a conventional water layer test were hence able to be greatly mitigated, even with SC-ISEs incorporating a relatively hydrophilic poly(3,4-ethylenedioxythiophene) doped with poly(styrenesulfonate) (PEDOT:PSS) solid contact. In solutions with a high background concentration of interfering ions, equilibrated ion-selective electrodes with foamlike membranes were able to reproduce their initial potentials within 0.6 mV uncertainty (n = 3) from 0 to 18 h. This was achieved despite sensor exposure to solutions exceeding the selectivity limit of the ISEs in 3 h intervals, allowing improvement of the potential reproducibility of the sensors. Since the introduction of foamlike structures into ISM is linked to temperature-controlled membrane deposition, it is envisaged that the method is generally applicable to all solid contact ion-selective electrodes that are based on polymeric membranes and require membrane deposition from the cocktail solution.
ISSN: 2379-3694
DOI: 10.1021/acssensors.1c01413
Schools: School of Civil and Environmental Engineering 
Organisations: Robert Bosch South East Asia Pte Ltd.
Research Centres: Nanyang Environment and Water Research Institute 
Rights: © 2021 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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