Specific co-ion sorption and diffusion properties influence membrane permselectivity

Ji, Yuanyuan; Luo, H.; Geise, Geoffrey M.

doi:10.1016/j.memsci.2018.06.010

Cited by 51 publications

(60 citation statements)

References 91 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 1) are in the same range as those reported by Guler et al 4 for twelve commercial IEMs (0.08-0.56). Ji et al 47 reported = 0.06 -0.51 in a series of lab-synthesized CEMs, which is also similar to the range we obtained. The fact that varied over a substantially larger range than (~10x vs. ~3x) indicates that variations in were more important than variations in in explaining variations in .…”

Section: Water Partition and Diffusion Coefficientssupporting

confidence: 90%

Microstructure determines water and salt permeation in commercial ion exchange membranes

Kingsbury

Zhu²,

Flotron³

et al. 2018

Preprint

View full text Add to dashboard Cite

Ion exchange membrane (IEM) performance in electrochemical processes such as fuel cells, redox flow batteries, or reverse electrodialysis (RED) is typically quantified through membrane selectivity and conductivity, which together determine the energy efficiency. However, water and co-ion transport (i.e., osmosis and salt diffusion / fuel crossover) also impact energy efficiency by allowing uncontrolled mixing of the electrolyte solutions to occur. For example, in RED with hypersaline water sources, uncontrolled mixing consumes 20-50% of the available mixing energy. Thus, in addition to high selectivity and high conductivity, it is desirable for IEMs to have low permeability to water and salt in order to minimize energy losses. Unfortunately, there is very little quantitative water and salt permeability information available for commercial IEMs, making it difficult to select the best membrane for a particular application. Accordingly, we measured the water and salt transport properties of 20 commercial IEMs and analyzed the relationships between permeability, diffusion and partitioning according to the solution-diffusion model. We found that water and salt permeance vary over several orders of magnitude among commercial IEMs, making some membranes better-suited than others to electrochemical processes that involve high salt concentrations and/or concentration gradients. Water and salt diffusion coefficients were found to be the principal factors contributing to the differences in permeance among commercial IEMs. We also observed that water and salt permeability were highly correlated to one another for all IEMs studied, regardless of polymer type or reinforcement. This finding suggests that transport of mobile salt in IEMs is governed by the microstructure of the membrane, and provides clear evidence that mobile salt does not interact strongly with polymer chains in highly-swollen IEMs. <br>

show abstract

Section: Water Partition and Diffusion Coefficientssupporting

confidence: 90%

Microstructure determines water and salt permeation in commercial ion exchange membranes

Kingsbury

Zhu²,

Flotron³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…At the same time, the ion separation by membranes never occurs with 100% selectivity and is usually accompanied by an undesired transfer of molecules or opposite charged ions. Despite the fact that these processes proceed to a much less extent, they usually determine the decrease in the efficiency of electrodialysis, fuel cells and other devices based on ion-exchange membranes [ 16 , 28 , 29 , 30 ]. That is why their understanding is so important for numerous membrane technologies.…”

Section: Introductionmentioning

confidence: 99%

Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

Стенина

Голубенко

Nikonenko

et al. 2020

IJMS

125

View full text Add to dashboard Cite

Nowadays, ion-exchange membranes have numerous applications in water desalination, electrolysis, chemistry, food, health, energy, environment and other fields. All of these applications require high selectivity of ion transfer, i.e., high membrane permselectivity. The transport properties of ion-exchange membranes are determined by their structure, composition and preparation method. For various applications, the selectivity of transfer processes can be characterized by different parameters, for example, by the transport number of counterions (permselectivity in electrodialysis) or by the ratio of ionic conductivity to the permeability of some gases (crossover in fuel cells). However, in most cases there is a correlation: the higher the flux density of the target component through the membrane, the lower the selectivity of the process. This correlation has two aspects: first, it follows from the membrane material properties, often expressed as the trade-off between membrane permeability and permselectivity; and, second, it is due to the concentration polarization phenomenon, which increases with an increase in the applied driving force. In this review, both aspects are considered. Recent research and progress in the membrane selectivity improvement, mainly including a number of approaches as crosslinking, nanoparticle doping, surface modification, and the use of special synthetic methods (e.g., synthesis of grafted membranes or membranes with a fairly rigid three-dimensional matrix) are summarized. These approaches are promising for the ion-exchange membranes synthesis for electrodialysis, alternative energy, and the valuable component extraction from natural or waste-water. Perspectives on future development in this research field are also discussed.

show abstract

“…The pumping efficiency η, defined as the ratio between drug transport over the total amount of ions transported, is another important quantity. Despite the selectivity of ion exchange membranes, co-ions in the source reservoir and ions in the target may still be driven by the electric field concentration gradient, thus passing through the IEM, so η is not necessarily equal to one 15 . Lastly, the ability to resist passive leakage for electrophoretic drug delivery devices is characterized by the ON/ OFF ratio, which is defined as the ratio of amount of transported drug between active pumping (voltage on) and passive diffusion (voltage off).…”

Section: Performance Indicesmentioning

confidence: 99%

Materials and Device Considerations in Electrophoretic Drug Delivery Devices

Chen

Proctor

Malliaras

2020

Sci Rep

View full text Add to dashboard Cite

✉ electrophoretic drug delivery devices are able to deliver drugs with exceptional temporal and spatial precision. this technology has emerged as a promising platform for treating pathologies ranging from neuropathic pain to epilepsy. As the range of applications continues to expand, there is an urgent need to understand the underlying physics and estimate materials and device parameters for optimal performance. Here, computational modeling of the electrophoretic drug delivery device is carried out. Three critical performance indices, namely, the amount of drug transported, the pumping efficiency and the ON/OFF ratio are investigated as a function of initial drug concentration in the device and fixed charge concentration in the ion exchange membrane. the results provide guidelines for future materials and device design with an eye towards tailoring device performance to match disease-specific demands.

show abstract

Specific co-ion sorption and diffusion properties influence membrane permselectivity

Cited by 51 publications

References 91 publications

Microstructure determines water and salt permeation in commercial ion exchange membranes

Microstructure determines water and salt permeation in commercial ion exchange membranes

Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

Materials and Device Considerations in Electrophoretic Drug Delivery Devices

Contact Info

Product

Resources

About