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Safari M, Naji L, Baker RT, Afshar Taromi F. Influence of electrolytes of Li salts, EMIMBF4, and mixed phases on electrochemical and physical properties of Nafion membrane. J Appl Polym Sci 2017. [DOI: 10.1002/app.45239] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Maryam Safari
- Department of Chemistry; AmirKabir University of Technology; P.O Box: 15875-4413 Tehran Iran
| | - Leila Naji
- Department of Chemistry; AmirKabir University of Technology; P.O Box: 15875-4413 Tehran Iran
| | - Richard T. Baker
- EaStChem, School of Chemistry; University of St. Andrews; St. Andrews Fife KY16 9ST United Kingdom
| | - Faramarz Afshar Taromi
- Faculty of Color and Polymer Engineering; AmirKabir University of Technology; P.O Box: 15875-4413 Tehran Iran
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Park Y, Kim S, Jang IH, Nam YS, Hong H, Choi D, Lee WG. Role of the electric field in selective ion filtration in nanostructures. Analyst 2016; 141:1294-300. [PMID: 26813413 DOI: 10.1039/c5an01980j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nafion has received great attention as a proton conductor that can block negative ions. Here, we report the effect of a Nafion coating on an anodic aluminium oxide (AAO) nanoporous membrane on its function of ion rejection and filtering depending on the electric field. In our experiments, Nafion, once coated, was used to repel the negative ions (anions) from the coated surface, and then selectively allowed positive ions (cations) to pass through the nanopores in the presence of an electric field. To demonstrate the proof-of-concept validation, we coated Nafion solution onto the surface of AAO membranes with 20 nm nanopores average diameter at different solution concentration levels. Vacuum filtration methods for Nafion coating were vertically applied to the plane of an AAO membrane. An electric field was then applied to the upper surface of the Nafion-coated AAO membrane to investigate if ion rejection and filtering was affected by the presence of the electric field. Both anions and cations could pass through the AAO nanopores without an electric field applied. However, only cations could well pass through the AAO nanopores under an electric field, thus effectively blocking anions from passing through the nanopores. This result shows that ion filtration of electrons has been selectively performed while the system also works as a vital catalyst in reactivating Nafion via electrolysis. A saturated viscosity ratio of Nafion solution for the coating was also determined. We believe that this approach is potentially beneficial for better understanding the fundamentals of selective ion filtration in nanostructures and for promoting the use of nanostructures in potential applications such as ion-based water purification and desalination system at the nanoscale in a massively electrically integrated format.
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Affiliation(s)
- Yong Park
- Department of Mechanical Engineering, College of Engineering, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea.
| | - Sueon Kim
- Department of Mechanical Engineering, College of Engineering, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea.
| | - In Hyuk Jang
- Department of Mechanical Engineering, College of Engineering, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea.
| | - Young Suk Nam
- Department of Mechanical Engineering, College of Engineering, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea.
| | - Hiki Hong
- Department of Mechanical Engineering, College of Engineering, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea.
| | - Dukhyun Choi
- Department of Mechanical Engineering, College of Engineering, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea.
| | - Won Gu Lee
- Department of Mechanical Engineering, College of Engineering, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea.
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Ghosh S, Chakrabarti R. Molecular dynamics simulation elucidates the preferential binding affinity of sodium and tetramethylammonium ions for tetrameric Nafion unit under aqueous conditions. RSC Adv 2016. [DOI: 10.1039/c6ra21845h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Preferential binding interaction of sodium and tetramethylammonium cations with Nafion pendant and backbone sites respectively.
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Affiliation(s)
- Soumadwip Ghosh
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai – 400076
- India
| | - Rajarshi Chakrabarti
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai – 400076
- India
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Iyer ESS, Khorwal V, Sundararajan M, Datta A. Intense phototautomer emission of 2-(3′-pyridyl)benzimidazole encapsulated in Nafion membrane. RSC Adv 2013. [DOI: 10.1039/c2ra21070c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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