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Nanostructured polyelectrolytes for ion-selective membranes

United States Patent

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September 8, 2020
View the Complete Patent at the US Patent & Trademark Office
Nanostructured polyelectrolyte bilayers deposited by Layer-by-Layer deposition on nanoporous membranes can be selectively crosslinked to modify the polyelectrolyte charge density and control ionic selectivity independent of ionic conductivity. For example, the polyelectrolyte bilayer can comprise a cationic polymer layer, such as poly(ethyleneimine), and an anionic polymer layer, such as poly(acrylic acid). Increasing the number of bilayers increases the cation selectivity when the poly(ethyleneimine) layer is crosslinked with glutaraldehyde. Crosslinking the membranes also increases the chemical and mechanical strength of the polyelectrolyte films. This controllable and inexpensive method can be used to create ion-selective and mechanically robust membranes on porous supports for a wide range of applications.
16/ 128,081
September 11, 2018
B01D 61/44 (20060101)B01D 71/40 (20060101)B01D 69/12 (20060101)C08J 5/22 (20060101)C08J 3/24 (20060101)B01J 43/00 (20060101)B01D 61/46 (20060101)B01D 69/02 (20060101)B01D 71/60 (20060101)
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention.