Porous Nafion membranes

Joseph, Dickson; Büsselmann, Julian; Harms, Corinna; Henkensmeier, Dirk; Larsen, Mikkel Juul; Dyck, Alexander; Jang, Jong Hyun; Kim, Hyoung Juhn; Nam, Suk Woo

doi:10.1016/j.memsci.2016.08.025

Cited by 32 publications

(23 citation statements)

References 24 publications

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“…After the reactor cooling down, a transparent jelly‐like lump could be seen on the bottom of the reactor. The similar phenomenon was also observed by Joseph et al when Nafion bends were dissolved in ethanol 38 . Meanwhile, the jelly could not be removed or reduced by an extension of dissolution time, stirring or decreasing the concentration of Nafion.…”

Section: Methodssupporting

confidence: 81%

“…The similar phenomenon was also observed by Joseph et al when Nafion bends were dissolved in ethanol. 38 Meanwhile, the jelly could not be removed or reduced by an extension of dissolution time, stirring or decreasing the concentration of Nafion. We diluted the jelly to a concentration of 2 wt%, and stirred the solution at a temperature of DMF boiling point with reflux in a nitrogen atmosphere for a few hours.…”

Section: Preparation Of Nafion/dmf Casing Solutionmentioning

confidence: 99%

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Fabrication and characterization of a novel Nafion‐PTFE composite hollow fiber membrane

Zhu

Zhou

et al. 2020

J of Applied Polymer Sci

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Nafion has been widely used in electrochemistry, but there are only a few reports on its application in other fields, such as, gas separation, even though it exhibits good performance. The primary reason for that is the high cost of Nafion and making a composite membrane with a thin Nafion layer is a potential solution to solve this problem. In this study, a novel Nafion‐PTFE composite hollow fiber membrane, which had a thin (~5 μm) and detect‐free Nafion layer on PTFE surface, without Nafion filling substrate pores was developed, differing from the reported ones in which Nafion resin was required to impregnate into porous PTFE membrane as thorough as possible to ensure the ion conductivity and operation stability. The surface morphology, crystallite, solubility in ethanol/water mixture, and water uptake of membranes were systemically investigated. The gas permeance tests were also conducted. The permeances of different gasses of prepared composite membranes were significantly enhanced compared with the commercial membranes due to the decrease of Nafion thicknesses, while the selectivity remained the same, verifying the detect‐free structure of Nafion layer on PTFE substrate. This study provided a good reference for the preparation and application of low‐cost Nafion composite membranes.

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Section: Methodssupporting

confidence: 81%

Section: Preparation Of Nafion/dmf Casing Solutionmentioning

confidence: 99%

Fabrication and characterization of a novel Nafion‐PTFE composite hollow fiber membrane

Zhu

Zhou

et al. 2020

J of Applied Polymer Sci

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“…On the other hand, a thick PB film has a lower sensitivity at low concentrations but a higher linear response range makes it more suitable for detecting high concentrations of H 2 O 2 . In addition, a porous membrane (Figure g) on the outer surface of the functionalized layers (e.g., Nafion) helps the immobilization of the enzyme and screens out molecules with the same electrostatic charge as the membrane (e.g., negative charges for Nafion) that may interfere with the glucose sensing (Figure h) …”

Section: Materials Fabrication Processes and Application Examples Omentioning

confidence: 99%

Section: Materials Fabrication Processes and Application Examples Omentioning

confidence: 99%

Enzyme‐Based Glucose Sensor: From Invasive to Wearable Device

Lee

Hong

Baik

et al. 2018

Adv Healthcare Materials

609

396

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Blood glucose concentration is a key indicator of patients' health, particularly for symptoms associated with diabetes mellitus. Because of the large number of diabetic patients, many approaches for glucose measurement have been studied to enable continuous and accurate glucose level monitoring. Among them, electrochemical analysis is prominent because it is simple and quantitative. This technology has been incorporated into commercialized and research-level devices from simple test strips to wearable devices and implantable systems. Although directly monitoring blood glucose assures accurate information, the invasive needle-pinching step to collect blood often results in patients (particularly young patients) being reluctant to adopt the process. An implantable glucose sensor may avoid the burden of repeated blood collections, but it is quite invasive and requires periodic replacement of the sensor owing to biofouling and its short lifetime. Therefore, noninvasive methods to estimate blood glucose levels from tears, saliva, interstitial fluid (ISF), and sweat are currently being studied. This review discusses the evolution of enzyme-based electrochemical glucose sensors, including materials, device structures, fabrication processes, and system engineering. Furthermore, invasive and noninvasive blood glucose monitoring methods using various biofluids or blood are described, highlighting the recent progress in the development of enzyme-based glucose sensors and their integrated systems.

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“…To improve the cycling performance, interface engineering between the electrode and electrolyte plays an important role. , In this work, sodiated Nafion was employed to improve the cycling performance. Although it is unlikely to prevent the TQA flux by working as a physical barrier for the sodiated Nafion layer as a result of its porous structure, − sodiated Nafion terminated with sodium sulfonates can provide anchor sites for TQA molecules. By allowing for the transport of sodium cations while limiting the movement of TQA radical anions via the electrostatic interaction, sodiated Nafion can prevent TQA molecules migrating to the counter electrode through the electrolyte, thus suppressing the dissolution (Figure a).…”

Section: Computational Simulationsmentioning

confidence: 99%

Sodium-Ion Storage Mechanism in Triquinoxalinylene and a Strategy for Improving Electrode Stability

Zhao

Zhang

et al. 2020

Energy Fuels

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Sodium-ion batteries are a promising alternative to lithium-ion batteries. In particular, organic sodium-ion batteries employing environmentally friendly organic materials as electrodes are gaining increasing research interest for developing secondary batteries as a result of the ease of processing, low cost, and flexibility of the organic electrode materials. Triquinoxalinylene (TQA) is a very promising organic electrode material for sodium-ion batteries. However, the poor cycling stability of TQA is impeding its adoption as an electrode material. In this work, we investigated the sodium-ion storage mechanism in TQA and the decay in capacity using both experimental and computational means. A strategy for improving the cycling stability is proposed, and it is demonstrated that the retention of capacity can be significantly improved from 31 to 85%.

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Porous Nafion membranes

Cited by 32 publications

References 24 publications

Fabrication and characterization of a novel Nafion‐PTFE composite hollow fiber membrane

Fabrication and characterization of a novel Nafion‐PTFE composite hollow fiber membrane

Enzyme‐Based Glucose Sensor: From Invasive to Wearable Device

Sodium-Ion Storage Mechanism in Triquinoxalinylene and a Strategy for Improving Electrode Stability

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