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Polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes

This work demonstrates that the ionic selectivity and ionic conductivity of nanoporous membranes can be controlled independently via layer-by-layer (LbL) deposition of polyelectrolytes and subsequent selective cross-linking of these polymer layers. LbL deposition offers a scalable, inexpensive metho...

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Detalles Bibliográficos
Autores principales: Percival, Stephen J., Small, Leo J., Spoerke, Erik D., Rempe, Susan B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9086297/
https://www.ncbi.nlm.nih.gov/pubmed/35547704
http://dx.doi.org/10.1039/c8ra05580g
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author Percival, Stephen J.
Small, Leo J.
Spoerke, Erik D.
Rempe, Susan B.
author_facet Percival, Stephen J.
Small, Leo J.
Spoerke, Erik D.
Rempe, Susan B.
author_sort Percival, Stephen J.
collection PubMed
description This work demonstrates that the ionic selectivity and ionic conductivity of nanoporous membranes can be controlled independently via layer-by-layer (LbL) deposition of polyelectrolytes and subsequent selective cross-linking of these polymer layers. LbL deposition offers a scalable, inexpensive method to tune the ion transport properties of nanoporous membranes by sequentially dip coating layers of cationic polyethyleneimine and anionic poly(acrylic acid) onto polycarbonate membranes. The cationic and anionic polymers are self-assembled through electrostatic and hydrogen bonding interactions and are chemically crosslinked to both change the charge distribution and improve the intermolecular integrity of the deposited films. Both the thickness of the deposited coating and the use of chemical cross-linking agents influence charge transport properties significantly. Increased polyelectrolyte thickness increases the selectivity for cationic transport through the membranes while adding polyelectrolyte films decreases the ionic conductivity compared to an uncoated membrane. Once the nanopores are filled, no additional decrease in conductivity is observed with increasing film thickness and, upon cross-linking, a portion of the lost conductivity is recovered. The cross-linking agent also influences the ionic selectivity of the resulting polyelectrolyte membranes. Increased selectivity for cationic transport occurs when using glutaraldehyde as the cross-linking agent, as expected due to the selective cross-linking of primary amines that decreases the net positive charge. Together, these results inform deposition of chemically robust, highly conductive, ion-selective membranes onto inexpensive porous supports for applications ranging from energy storage to water purification.
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spelling pubmed-90862972022-05-10 Polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes Percival, Stephen J. Small, Leo J. Spoerke, Erik D. Rempe, Susan B. RSC Adv Chemistry This work demonstrates that the ionic selectivity and ionic conductivity of nanoporous membranes can be controlled independently via layer-by-layer (LbL) deposition of polyelectrolytes and subsequent selective cross-linking of these polymer layers. LbL deposition offers a scalable, inexpensive method to tune the ion transport properties of nanoporous membranes by sequentially dip coating layers of cationic polyethyleneimine and anionic poly(acrylic acid) onto polycarbonate membranes. The cationic and anionic polymers are self-assembled through electrostatic and hydrogen bonding interactions and are chemically crosslinked to both change the charge distribution and improve the intermolecular integrity of the deposited films. Both the thickness of the deposited coating and the use of chemical cross-linking agents influence charge transport properties significantly. Increased polyelectrolyte thickness increases the selectivity for cationic transport through the membranes while adding polyelectrolyte films decreases the ionic conductivity compared to an uncoated membrane. Once the nanopores are filled, no additional decrease in conductivity is observed with increasing film thickness and, upon cross-linking, a portion of the lost conductivity is recovered. The cross-linking agent also influences the ionic selectivity of the resulting polyelectrolyte membranes. Increased selectivity for cationic transport occurs when using glutaraldehyde as the cross-linking agent, as expected due to the selective cross-linking of primary amines that decreases the net positive charge. Together, these results inform deposition of chemically robust, highly conductive, ion-selective membranes onto inexpensive porous supports for applications ranging from energy storage to water purification. The Royal Society of Chemistry 2018-09-25 /pmc/articles/PMC9086297/ /pubmed/35547704 http://dx.doi.org/10.1039/c8ra05580g Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Percival, Stephen J.
Small, Leo J.
Spoerke, Erik D.
Rempe, Susan B.
Polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes
title Polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes
title_full Polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes
title_fullStr Polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes
title_full_unstemmed Polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes
title_short Polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes
title_sort polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9086297/
https://www.ncbi.nlm.nih.gov/pubmed/35547704
http://dx.doi.org/10.1039/c8ra05580g
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