scholarly journals Correction to “110th Anniversary: The Dehydration and Loss of Ionic Conductivity in Anion Exchange Membranes Due to FeCl4– Ion Exchange and the Role of Membrane Microstructure”

2020 ◽  
Vol 59 (21) ◽  
pp. 10229-10230
Author(s):  
Michael J. McGrath ◽  
Nicholas Patterson ◽  
Bryce C. Manubay ◽  
Samantha H. Hardy ◽  
John J. Malecha ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Ion Exchange ◽  
Anion Exchange ◽  
Anion Exchange Membranes ◽  
Membrane Microstructure

scholarly journals 110th Anniversary: The Dehydration and Loss of Ionic Conductivity in Anion Exchange Membranes Due to FeCl4– Ion Exchange and the Role of Membrane Microstructure

2019 ◽  
Vol 58 (49) ◽  
pp. 22250-22259
Author(s):  
Michael J. McGrath ◽  
Nicholas Patterson ◽  
Bryce C. Manubay ◽  
Samantha H. Hardy ◽  
John J. Malecha ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Ion Exchange ◽  
Anion Exchange ◽  
Anion Exchange Membranes ◽  
Membrane Microstructure

scholarly journals Transport Characteristics of CJMAED™ Homogeneous Anion Exchange Membranes in Sodium Chloride and Sodium Sulfate Solutions

2021 ◽  
Vol 22 (3) ◽  
pp. 1415
Author(s):  
Veronika Sarapulova ◽  
Natalia Pismenskaya ◽  
Valentina Titorova ◽  
Mikhail Sharafan ◽  
Yaoming Wang ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Volume Fraction ◽  
Exchange Capacity ◽  
Polymer Materials ◽  
Transport Numbers ◽  
Anion Exchange Membranes ◽  
Microheterogeneous Model ◽  
Pass Through ◽  
Pes Membrane

The interplay between the ion exchange capacity, water content and concentration dependences of conductivity, diffusion permeability, and counterion transport numbers (counterion permselectivity) of CJMA-3, CJMA-6 and CJMA-7 (Hefei Chemjoy Polymer Materials Co. Ltd., China) anion-exchange membranes (AEMs) is analyzed using the application of the microheterogeneous model to experimental data. The structure–properties relationship for these membranes is examined when they are bathed by NaCl and Na2SO4 solutions. These results are compared with the characteristics of the well-studied homogenous Neosepta AMX (ASTOM Corporation, Japan) and heterogeneous AMH-PES (Mega a.s., Czech Republic) anion-exchange membranes. It is found that the CJMA-6 membrane has the highest counterion permselectivity (chlorides, sulfates) among the CJMAED series membranes, very close to that of the AMX membrane. The CJMA-3 membrane has the transport characteristics close to the AMH-PES membrane. The CJMA-7 membrane has the lowest exchange capacity and the highest volume fraction of the intergel spaces filled with an equilibrium electroneutral solution. These properties predetermine the lowest counterion transport number in CJMA-7 among other investigated AEMs, which nevertheless does not fall below 0.87 even in 1.0 eq L−1 solutions of NaCl or Na2SO4. One of the reasons for the decrease in the permselectivity of CJMAED membranes is the extended macropores, which are localized at the ion-exchange material/reinforcing cloth boundaries. In relatively concentrated solutions, the electric current prefers to pass through these well-conductive but nonselective macropores rather than the highly selective but low-conductive elements of the gel phase. It is shown that the counterion permselectivity of the CJMA-7 membrane can be significantly improved by coating its surface with a dense homogeneous ion-exchange film.

Crosslinked metallo-polyelectrolytes with enhanced flexibility and dimensional stability for anion-exchange membranes

2020 ◽  
Vol 11 (28) ◽  
pp. 4542-4546 ◽  
Author(s):  
Tianyu Zhu ◽  
Chuanbing Tang
Keyword(s):  
Ionic Conductivity ◽  
Anion Exchange ◽  
Dimensional Stability ◽  
Anion Exchange Membranes

We report a class of crosslinked metallo-polyelectrolytes as anion exchange membranes with exceptional mechanical flexibility, dimensional stability and ionic conductivity.

Preparation and characterization of crosslinked poly(vinylimidazolium) anion exchange membranes for artificial photosynthesis

2019 ◽  
Vol 7 (41) ◽  
pp. 23818-23829 ◽  
Author(s):  
Blaine M. Carter ◽  
Laura Keller ◽  
Matthias Wessling ◽  
Daniel J. Miller
Keyword(s):  
Ionic Conductivity ◽  
Ion Exchange ◽  
Water Content ◽  
Small Molecule ◽  
Artificial Photosynthesis ◽  
Anion Exchange Membranes ◽  
Molecule Transport ◽  
Small Molecule Transport ◽  
Low Alcohol

The dependence of small molecule transport on the water content of ion exchange materials frustrates the development of membranes with both high ionic conductivity and low alcohol permeability for artificial photosynthesis devices.

scholarly journals Preparation of Two-Layer Anion-Exchange Poly(ethersulfone) Based Membrane: Effect of Surface Modification

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Lucie Zarybnicka ◽  
Eliska Stranska ◽  
Jana Machotova ◽  
Gabriela Lencova
Keyword(s):  
Surface Layer ◽  
Surface Modification ◽  
Ion Exchange ◽  
Anion Exchange ◽  
Exchange Capacity ◽  
Sem Analysis ◽  
Electrochemical Characteristics ◽  
Anion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Effect Of Surface

The present work deals with the surface modification of a commercial microfiltration poly(ethersulfone) membrane by graft polymerization technique. Poly(styrene-co-divinylbenzene-co-4-vinylbenzylchloride) surface layer was covalently attached onto the poly(ethersulfone) support layer to improve the membrane electrochemical properties. Followed by amination, a two-layer anion-exchange membrane was prepared. The effect of surface layer treatment using the extraction in various solvents on membrane morphological and electrochemical characteristics was studied. The membranes were tested from the point of view of water content, ion-exchange capacity, specific resistance, permselectivity, FT-IR spectroscopy, and SEM analysis. It was found that the two-layer anion-exchange membranes after the extraction using tetrahydrofuran or toluene exhibited smooth and porous surface layer, which resulted in improved ion-exchange capacity, electrical resistance, and permselectivity of the membranes.

scholarly journals A facile approach to prepare crosslinked polysulfone-based anion exchange membranes with enhanced alkali resistance and dimensional stability

RSC Advances ◽  
2019 ◽  
Vol 9 (62) ◽  
pp. 36374-36385
Author(s):  
Chao Wang ◽  
Nengxiu Pan ◽  
Yuliang Jiang ◽  
Junbin Liao ◽  
Arcadio Sotto ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Dimensional Stability ◽  
Synthesis Method ◽  
Exchange Capacity ◽  
Alkali Resistance ◽  
Anion Exchange Membranes ◽  
Facile Synthesis ◽  
Ion Exchange Capacity ◽  
Alkali Stability

Novel anion exchange membranes with enhanced ion exchange capacity, dimensional stability and alkali stability were prepared by a facile synthesis method.

Crosslinking of comb-shaped polymer anion exchange membranes via thiol–ene click chemistry

2016 ◽  
Vol 7 (14) ◽  
pp. 2464-2475 ◽  
Author(s):  
Liang Zhu ◽  
Tawanda J. Zimudzi ◽  
Nanwen Li ◽  
Jing Pan ◽  
Bencai Lin ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Ion Exchange ◽  
Click Chemistry ◽  
Anion Exchange ◽  
Quaternary Ammonium ◽  
Polymer Electrolytes ◽  
Anion Exchange Membranes ◽  
Alkaline Fuel Cell ◽  
Phenylene Oxide ◽  
Durable Polymer

To produce anion conductive and durable polymer electrolytes for alkaline fuel cell applications, a series of cross-linked quaternary ammonium functionalized poly(2,6-dimethyl-1,4-phenylene oxide)s with mass-based ion exchange capacities (IEC) ranging from 1.80 to 2.55 mmol g−1 were synthesized via thiol–ene click chemistry.

Time- and pH-dependent leaching of ions from deciduous and coniferous foliage

1990 ◽  
Vol 20 (11) ◽  
pp. 1779-1785 ◽  
Author(s):  
L. J. Puckett
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Forest Canopy ◽  
Ion Selectivity ◽  
White Pine ◽  
Natural Conditions ◽  
Canopy Removal ◽  
Exchange Medium ◽  
Experiment Duration

Leaching of ions from foliage of black gum (Nyssasylvatica Marsh.), chestnut oak (Quercusprinus L.), and white pine (Pinusstrobus L.) in response to increasing exposure time to and concentration of H+ was examined in a laboratory study. Ten individual leaves and needle bundles were exposed to H+ solutions at pH 3.0, 4.0, and 5.6 for periods of 5, 50, 500, and 1000 min. Increases in the removal of Ca2+ and Mg2+ from all species tested were strongly related to increases in experiment duration and H+ concentration, confirming the role of ion exchange in the removal of these ions from the forest canopy. Removal of Na+ and K+ did not appear to be strongly influenced by ion exchange. Positive relations between SO42− and H+ (and presumably Cl−) for the deciduous species suggest that anion exchange may be involved in the removal process. Given the relatively small number of anion exchange sites on cuticles, and because SO42− is the primary anion in both rain and throughfall, anion exchange is not likely to contribute significant amounts of anions under natural conditions. It is difficult to extrapolate results from an experiment of this type to what might be expected under natural conditions. However, the response of whole leaves and needles fits that expected based on the ion selectivity of the cuticle as a carboxylic acid ion-exchange medium and holds promise for understanding the processes involved in ion leaching from forest canopies.

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