Nafion® modified with primary amines: chemical structure, sorption properties and pervaporative separation of methanol-dimethyl carbonate mixtures

Kludský, Miroslav; Vopička, Ondřej; Matějka, Pavel; Hovorka, Štěpán; Friess, Karel

doi:10.1016/j.eurpolymj.2017.12.028

Cited by 31 publications

(23 citation statements)

References 51 publications

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“…The permeabilities of Nafion and its modifications for methanol and dimethyl carbonate at 40°C are shown in Figure 9. Pervaporation and, to some extent, spectral characteristics of the films for pure Nafion, Nafion modified with NaOH, BZL, and ETH were shown in our previous work [ 16 ] and are showed here for comparison and discussed in more detail. Clearly, permeability for both components increased with the increasing molar fraction of methanol in the liquid feed, thus showing that plasticization of the polymer by the more hydrophilic component (methanol) took place.…”

Section: Resultsmentioning

confidence: 61%

“…Points represent measured values, curves are plots of GAB model (Equation (1)). Data for pure Nafion and Nafion modified with NaOH, BZL, and ETH were taken from the literature [ 16 ] [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Pervaporation is a membrane separation method in which liquid evaporates through a membrane, while the vapor (permeate) is removed by vacuum or by a sweep gas. [ 52 ] The pervaporation characteristics of the modified Nafion membranes were measured at 40.0 ± 0.7°C using an earlier reported sweep‐gas apparatus [ 16 ] ; the use of sweep gas mitigates the pressure force acting on the membrane during pervaporation to vacuum. Prior to the measurements, the membrane was cleared from free water by a two‐step extraction in methanol.…”

Section: Methodsmentioning

confidence: 99%

“…Membranes with several inorganic (Li + , Na + , etc.,) and organic (tetraalkylammonium, ethanolammonium, benyzlammonium) counter ions were studied for this application. [ 16, 18, 19 ] Moreover, ion‐exchanged PFIE membranes could be applicable also for the separation of other alcohol‐ester mixtures, such as those of methanol and methyl acetate. [ 17, 27, 28 ] A systematic study can help to understand the structure–property relationships and to choose the optimal counter ion.…”

Section: Introductionmentioning

confidence: 99%

“…If we limit ourselves to Nafion, this polymer forms hydrophobic PTFE‐like domains and hydrophilic cavities covered with the sulfo groups, [ 2, 29‐32 ] which are accessible for the ion‐exchange reactions, and which are long known to react with amines. [ 10, 16, 33‐37 ] Moreover, the formation of bridges was observed for the Nafion salts of multivalent ions, such as Fe 2+ , Fe 3+ , or Ca 2+ . [ 7, 8, 36, 38 ] The ion‐exchanged Nafions, such as the sodium salt, were earlier shown to display by about 100°C higher decomposition temperature [ 7, 8, 39 ] and comparably higher glass transition temperature when compared to pure Nafion.…”

Section: Introductionmentioning

confidence: 99%

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Nafion modified with simple bases and amino acid derivatives: Survey of physical properties and search for effective pervaporation membranes

Kludský

Dendisová

Hrdlička

et al. 2021

Polymer Engineering & Sci

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Nafion, a solid perfluorinated polymeric sulfonic acid, reacts readily with bases and can thus be converted to a tremendous number of individual modifications. A survey of spectral, mechanical, thermal, and pervaporation characteristics of Nafion modified with simple inorganic and organic bases and with the derivatives of amino acids is thus reported. The spectral characteristics, thermal stability, and Tg changed pronouncedly for Nafion modified with the stronger bases, such as ammonium or tris(hydroxymethyl)aminomethane, while minor changes were observed for Nafion modified with the derivatives of amino acids. Permeability and selectivity of Nafion observed for the pervaporation of methanol–dimethyl carbonate and methanol–methyl acetate mixtures were mainly influenced by the modification with amines bearing hydroxyl and, most pronouncedly, sulfo groups. Importantly, the pervaporation membrane from Nafion modified with taurine appeared similarly permeable and hygroscopic but more methanol‐selective than that from pure Nafion.

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nafion modified with simple bases and amino acid derivatives: Survey of physical properties and search for effective pervaporation membranes

Kludský

Dendisová

Hrdlička

et al. 2021

Polymer Engineering & Sci

Self Cite

View full text Add to dashboard Cite

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Aromatic Ring–Mediated Nonspecific Signaling Mechanism and Nafion‐Dominated Solution in Graphene Field‐Effect Transistor–Based Nucleic Acid Biosensors

Chen

Lyu

Sun

et al. 2023

Adv Funct Materials

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Graphene field‐effect transistors (G‐FETs) have attracted widespread attention in disease diagnosis, benefiting from these advantages of high sensitivity, label‐free, easy integration, and direct detection of nucleic acids (NAs) in liquid environments. However, the problem of nonspecific signals in G‐FETs is not fundamentally solved due to a lack of systematic theoretical research to support the development of effective solutions. Thus, researchers have to rely on speculative mechanisms to minimize nonspecific signals in experiments as much as possible. Herein, the nonspecific signal mechanism caused by eight types of π–π interaction paths mediated by aromatic rings is theoretically determined. Based on theoretical simulation results, the feasibility of blocking nonspecific signal paths through Nafion functionalization methods is experimentally verified. Experiments confirm that Nafion‐modified G‐FETs (NMG‐FETs) have excellent performance in avoiding nonspecific signals compared to traditional G‐FETs. Furthermore, the NMG‐FET achieves ultra‐sensitive detection of Down syndrome–related DNA down to 1 aM and severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) RNA down to 5 aM, and shows good specificity in base recognition. This study is expected to promote the theoretical advancement of the nonspecific signal mechanism in G‐FET NA detection and offer a practical strategy for improving signal purity and accuracy.

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Recent Advances in Graphene Field‐Effect Transistor Toward Biological Detection

Sun,

Zhang,

et al. 2024

Adv Funct Materials

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Recently, field‐effect transistors (FETs) have emerged as a novel type of multiparameter, high‐performance, highly integrated platform for biochemical detection, leveraging their classical three‐terminal structure, working principles, and fabrication methods. Notably, graphene materials, known for their exceptional electrical and optical properties as well as biocompatibility, serve as a fundamental component of these devices, further enhancing their advantages in biological detection. This review places special emphasis on recent advancements in graphene field‐effect transistor (GFET)‐based biosensors and focuses on four main areas: i) the basic concepts of FETs and the specific electrical properties of GFETs; ii) various state‐of‐the‐art approaches to enhance the performance of GFET‐based biosensors in terms of operating principles and the “3S”—stability, sensitivity, and specificity; iii) multiplexed detection strategies for GFET‐based biosensors; and iv) the current challenges and future perspectives in the field of GFET‐based biosensors. It is hoped that this article can profoundly elucidate the development of GFET biosensors and inspire a broader audience.

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Nafion® modified with primary amines: chemical structure, sorption properties and pervaporative separation of methanol-dimethyl carbonate mixtures

Cited by 31 publications

References 51 publications

Nafion modified with simple bases and amino acid derivatives: Survey of physical properties and search for effective pervaporation membranes

Nafion modified with simple bases and amino acid derivatives: Survey of physical properties and search for effective pervaporation membranes

Aromatic Ring–Mediated Nonspecific Signaling Mechanism and Nafion‐Dominated Solution in Graphene Field‐Effect Transistor–Based Nucleic Acid Biosensors

Recent Advances in Graphene Field‐Effect Transistor Toward Biological Detection

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