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Issue 57, 2018
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Polyelectrolyte layer-by-layer deposition on nanoporous supports for ion selective membranes

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Abstract

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.

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

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Supplementary files

Article information


Submitted
29 Jun 2018
Accepted
14 Sep 2018
First published
25 Sep 2018

This article is Open Access

RSC Adv., 2018,8, 32992-32999
Article type
Paper

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

S. J. Percival, L. J. Small, E. D. Spoerke and S. B. Rempe, RSC Adv., 2018, 8, 32992
DOI: 10.1039/C8RA05580G

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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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    [Original citation] - Published by The Royal Society of Chemistry.

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