Assessment of the sensitivity of DQF/ZQF 2 H NMR of D 2 O for studying modified nafion membranes at 20 °C and 80 °C

Thiessen, Alyxandra; Verbeek, Wesley; Gritter, Kelsey; Ooms, Kristopher J.

doi:10.1016/j.ssnmr.2018.03.005

Cited by 4 publications

(5 citation statements)

References 24 publications

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“…NMR diffusion experiments in the solid state represent a state-of-the-art method for studying hydration processes. In the work reported by Thiessen et al (2018) [ 165 ], hydration was studied from the perspective of kinetics, using double- and zero-quantum-filtered (DQF/ZQF) deuterium NMR. The study was directed at evaluating proton migration and detecting hydrophilic pockets in Nafion membranes.…”

Section: Experimental Strategies For the Study Of Hydrationmentioning

confidence: 99%

“…T 1 and T 2 relaxation times were calculated for trapped water as it migrated through these membranes ( Figure 18 ). The equations that describe the line-shapes in Figure 18 using relaxation times can be found in [ 165 ] (cf. Equations (1) and (2) in [ 165 ]).…”

Section: Experimental Strategies For the Study Of Hydrationmentioning

confidence: 99%

“…The equations that describe the line-shapes in Figure 18 using relaxation times can be found in [ 165 ] (cf. Equations (1) and (2) in [ 165 ]).…”

Section: Experimental Strategies For the Study Of Hydrationmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

et al. 2021

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The development of polyaniline (PANI)/biomaterial composites as humidity sensor materials represents an emerging area of advanced materials with promising applications. The increasing attention to biopolymer materials as desiccants for humidity sensor components can be explained by their sustainability and propensity to absorb water. This review represents a literature survey, covering the last decade, which is focused on the interrelationship between the core properties and moisture responsiveness of multicomponent polymer/biomaterial composites. This contribution provides an overview of humidity-sensing materials and the corresponding sensors that emphasize the resistive (impedance) type of PANI devices. The key physicochemical properties that affect moisture sensitivity include the following: swelling, water vapor adsorption capacity, porosity, electrical conductivity, and enthalpies of adsorption and vaporization. Some key features of humidity-sensing materials involve the response time, recovery time, and hysteresis error. This work presents a discussion on various types of humidity-responsive composite materials that contain PANI and biopolymers, such as cellulose, chitosan and structurally related systems, along with a brief overview of carbonaceous and ceramic materials. The effect of additive components, such as polyvinyl alcohol (PVA), for film fabrication and their adsorption properties are also discussed. The mechanisms of hydration and proton transfer, as well as the relationship with conductivity is discussed. The literature survey on hydration reveals that the textural properties (surface area and pore structure) of a material, along with the hydrophile–lipophile balance (HLB) play a crucial role. The role of HLB is important in PANI/biopolymer materials for understanding hydration phenomena and hydrophobic effects. Fundamental aspects of hydration studies that are relevant to humidity sensor materials are reviewed. The experimental design of humidity sensor materials is described, and their relevant physicochemical characterization methods are covered, along with some perspectives on future directions in research on PANI-based humidity sensors.

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Section: Experimental Strategies For the Study Of Hydrationmentioning

confidence: 99%

Section: Experimental Strategies For the Study Of Hydrationmentioning

confidence: 99%

“…The equations that describe the line-shapes in Figure 18 using relaxation times can be found in [ 165 ] (cf. Equations (1) and (2) in [ 165 ]).…”

Section: Experimental Strategies For the Study Of Hydrationmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

et al. 2021

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“…The corresponding optical micrograph in Figure a confirms a well-adhering, homogeneously thick, and continuous graphene layer (goldish color) on top of the Nafion without gaps within the resolution limitation of the applied optical technique. The darker layer within the Nafion HP membrane is the ePTFE reinforcement, which is used to provide additional mechanical stabilization to this type of thin membrane. , In annular dark-field mode STEM (ADF-STEM) (Figure b), the graphene film appears as a bright and homogeneous contrast with few minor flaws like small pores or remaining inclusions from the graphene ink, as indicated by black arrows. The imaged region featured an unusually high density of pores or inclusions and was chosen to illustrate the type of flaw in the otherwise smooth and dense film.…”

Section: Resultsmentioning

confidence: 99%

Graphene Coating of Nafion Membranes for Enhanced Fuel Cell Performance

Ruhkopf

Plachetka

Moeller

et al. 2023

ACS Appl. Eng. Mater.

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Electrochemically exfoliated graphene (e-G) thin films on Nafion membranes exhibit a selective barrier effect against undesirable fuel crossover. This approach combines the high proton conductivity of state-of-the-art Nafion and the ability of e-G layers to effectively block the transport of methanol and hydrogen. Nafion membranes are coated with aqueous dispersions of e-G on the anode side, making use of a facile and scalable spray process. Scanning transmission electron microscopy and electron energy-loss spectroscopy confirm the formation of a dense percolated graphene flake network, which acts as a diffusion barrier. The maximum power density in direct methanol fuel cell (DMFC) operation with e-G-coated Nafion N115 is 3.9 times higher than that of the Nafion N115 reference (39 vs 10 mW cm–2@0.3 V) at a 5M methanol feed concentration. This suggests the application of e-G-coated Nafion membranes for portable DMFCs, where the use of highly concentrated methanol is desirable.

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Strategies for acquisition of resonance assignment spectra of highly dynamic membrane proteins: a GPCR case study

van Aalst,

Jang,

Halligan

et al. 2023

J Biomol NMR

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Assessment of the sensitivity of DQF/ZQF 2 H NMR of D 2 O for studying modified nafion membranes at 20 °C and 80 °C

Cited by 4 publications

References 24 publications

Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

Graphene Coating of Nafion Membranes for Enhanced Fuel Cell Performance

Strategies for acquisition of resonance assignment spectra of highly dynamic membrane proteins: a GPCR case study

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Assessment of the sensitivity of DQF/ZQF 2 H NMR of D 2 O for studying modified nafion membranes at 20 °C and 80 °C

Cited by 4 publications

References 24 publications

Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

Polyaniline/Biopolymer Composite Systems for Humidity Sensor Applications: A Review

Graphene Coating of Nafion Membranes for Enhanced Fuel Cell Performance

Strategies for acquisition of resonance assignment spectra of highly dynamic membrane proteins: a GPCR case study

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Product

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Assessment of the sensitivity of DQF/ZQF 2 H NMR of D 2 O for studying modified nafion membranes at 20 °C and 80 °C