Evolution of electrochemical potentials mediated by lipophilic salts at the buried membrane interface of solid contact ion selective electrodes
In this work, the lipophilic salt tetradodecylammonium tetrakis(4-chlorophenyl)borate (ETH 500) was incorporated into a polyvinylidene fluoride (PVDF) matrix. This was subsequently used as a binder in a carbon composite solid contact for ion selective electrodes. The ability of ETH 500 to establish...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/160776 |
| _version_ | 1826117012583088128 |
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| author | Cheong, Yi Heng Sagar, Kaushal Lisak, Grzegorz |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Cheong, Yi Heng Sagar, Kaushal Lisak, Grzegorz |
| author_sort | Cheong, Yi Heng |
| collection | NTU |
| description | In this work, the lipophilic salt tetradodecylammonium tetrakis(4-chlorophenyl)borate (ETH 500) was incorporated into a polyvinylidene fluoride (PVDF) matrix. This was subsequently used as a binder in a carbon composite solid contact for ion selective electrodes. The ability of ETH 500 to establish reproducible potentials when added to a batch of solid contact ion selective electrodes (SC-ISEs) is disputed in the literature. We address the discrepancy by showing that blending of the salt in binder prevents uncontrolled partitioning of solid contact components to the solvent during the membrane deposition step, resulting in reproducible SC-ISEs. Model potassium selective SC-ISEs in a batch reproduced their standard potentials EI0 with a standard deviation of 1.3 mV at a low salt loading of 3 wt% ETH 500 in the binder. We also show that establishing a SC composition that is far from equilibrium with the ISM can also introduce a slow partition of charged species over more than a month in storage. By further optimizing the composition of the binder, increased hydrophobicity, reduced drift during storage and a shortened time to ready can be obtained, verifying the versatility of such an approach. |
| first_indexed | 2024-10-01T04:20:48Z |
| format | Journal Article |
| id | ntu-10356/160776 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:20:48Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1607762022-08-02T08:15:46Z Evolution of electrochemical potentials mediated by lipophilic salts at the buried membrane interface of solid contact ion selective electrodes Cheong, Yi Heng Sagar, Kaushal Lisak, Grzegorz School of Civil and Environmental Engineering Residues and Resource Reclamation Centre Nanyang Environment and Water Research Institute Engineering::Environmental engineering Potentiometry Potential Stability In this work, the lipophilic salt tetradodecylammonium tetrakis(4-chlorophenyl)borate (ETH 500) was incorporated into a polyvinylidene fluoride (PVDF) matrix. This was subsequently used as a binder in a carbon composite solid contact for ion selective electrodes. The ability of ETH 500 to establish reproducible potentials when added to a batch of solid contact ion selective electrodes (SC-ISEs) is disputed in the literature. We address the discrepancy by showing that blending of the salt in binder prevents uncontrolled partitioning of solid contact components to the solvent during the membrane deposition step, resulting in reproducible SC-ISEs. Model potassium selective SC-ISEs in a batch reproduced their standard potentials EI0 with a standard deviation of 1.3 mV at a low salt loading of 3 wt% ETH 500 in the binder. We also show that establishing a SC composition that is far from equilibrium with the ISM can also introduce a slow partition of charged species over more than a month in storage. By further optimizing the composition of the binder, increased hydrophobicity, reduced drift during storage and a shortened time to ready can be obtained, verifying the versatility of such an approach. Economic Development Board (EDB) Nanyang Technological University Y. H. Cheong gratefully acknowledges funding from the Economic Development Board (EDB) of Singapore’s Industrial Postgraduate Program in support of this work. The authors would like to thank NEWRI (Nanyang Technological University), Singapore’s Economic Development Board (EDB) and Robert Bosch SEA for their financial support in this research. 2022-08-02T08:15:46Z 2022-08-02T08:15:46Z 2021 Journal Article Cheong, Y. H., Sagar, K. & Lisak, G. (2021). Evolution of electrochemical potentials mediated by lipophilic salts at the buried membrane interface of solid contact ion selective electrodes. Sensors and Actuators B: Chemical, 349, 130766-. https://dx.doi.org/10.1016/j.snb.2021.130766 0925-4005 https://hdl.handle.net/10356/160776 10.1016/j.snb.2021.130766 2-s2.0-85115811627 349 130766 en Sensors and Actuators B: Chemical © 2021 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Environmental engineering Potentiometry Potential Stability Cheong, Yi Heng Sagar, Kaushal Lisak, Grzegorz Evolution of electrochemical potentials mediated by lipophilic salts at the buried membrane interface of solid contact ion selective electrodes |
| title | Evolution of electrochemical potentials mediated by lipophilic salts at the buried membrane interface of solid contact ion selective electrodes |
| title_full | Evolution of electrochemical potentials mediated by lipophilic salts at the buried membrane interface of solid contact ion selective electrodes |
| title_fullStr | Evolution of electrochemical potentials mediated by lipophilic salts at the buried membrane interface of solid contact ion selective electrodes |
| title_full_unstemmed | Evolution of electrochemical potentials mediated by lipophilic salts at the buried membrane interface of solid contact ion selective electrodes |
| title_short | Evolution of electrochemical potentials mediated by lipophilic salts at the buried membrane interface of solid contact ion selective electrodes |
| title_sort | evolution of electrochemical potentials mediated by lipophilic salts at the buried membrane interface of solid contact ion selective electrodes |
| topic | Engineering::Environmental engineering Potentiometry Potential Stability |
| url | https://hdl.handle.net/10356/160776 |
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