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Addressing Specific (Poly)ion Effects for Layer-by-Layer Membranes

[Image: see text] Layer-by-layer (LbL) assembly of the alternating adsorption of oppositely charged polyions is an extensively studied method to produce nanofiltration membranes. In this work, the concept of chaotropicity of the polycation and its counterion is introduced in the LbL field. In genera...

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Autores principales: Scheepers, Daniëlle, Casimiro, Anna, Borneman, Zandrie, Nijmeijer, Kitty
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10012173/
https://www.ncbi.nlm.nih.gov/pubmed/36935653
http://dx.doi.org/10.1021/acsapm.2c02078
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author Scheepers, Daniëlle
Casimiro, Anna
Borneman, Zandrie
Nijmeijer, Kitty
author_facet Scheepers, Daniëlle
Casimiro, Anna
Borneman, Zandrie
Nijmeijer, Kitty
author_sort Scheepers, Daniëlle
collection PubMed
description [Image: see text] Layer-by-layer (LbL) assembly of the alternating adsorption of oppositely charged polyions is an extensively studied method to produce nanofiltration membranes. In this work, the concept of chaotropicity of the polycation and its counterion is introduced in the LbL field. In general, the more chaotropic a polyion, the lower its effective charge, charge availability, and hydrophilicity. Here, this is researched for the well-known PDADMAC (polydiallyldimethylammonium chloride) and PAH (poly(allylamine) hydrochloride), and the synthesized PAMA (polyallylmultimethylammonium), with two different counterions (I(–) and Cl(–)). Higher chaotropicity (PDADMAC > PAMA-I > PAMA-Cl > PAH) translates into a reduced charge availability and a more pronounced extrinsic charge compensation, resulting in more mass adsorption and a higher pure water permeability. PAMA-containing membranes show the most interesting results in the series. Due to its molecular structure, the chaotropicity of this polycation perfectly lies between PDADMAC and PAH. Overall, the chaotropicity of PAMA membranes allows for the formation of the right balance between extrinsic and intrinsic charge compensation with PSS. Moreover, modifying the nature of the counterions of PAMA (I(–) or Cl(–)) allows to tune the density of the multilayer and results in lower size exclusion abilities with PAMA-I compared to PAMA-Cl (higher MWCO and lower MgSO(4) retention). In general, the contextualization of the polyion interaction within the specific (poly)ion effects expands the understanding of the influence of the charge density of polycations without ignoring the chemical nature of the functional groups in their monomer units.
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spelling pubmed-100121732023-03-15 Addressing Specific (Poly)ion Effects for Layer-by-Layer Membranes Scheepers, Daniëlle Casimiro, Anna Borneman, Zandrie Nijmeijer, Kitty ACS Appl Polym Mater [Image: see text] Layer-by-layer (LbL) assembly of the alternating adsorption of oppositely charged polyions is an extensively studied method to produce nanofiltration membranes. In this work, the concept of chaotropicity of the polycation and its counterion is introduced in the LbL field. In general, the more chaotropic a polyion, the lower its effective charge, charge availability, and hydrophilicity. Here, this is researched for the well-known PDADMAC (polydiallyldimethylammonium chloride) and PAH (poly(allylamine) hydrochloride), and the synthesized PAMA (polyallylmultimethylammonium), with two different counterions (I(–) and Cl(–)). Higher chaotropicity (PDADMAC > PAMA-I > PAMA-Cl > PAH) translates into a reduced charge availability and a more pronounced extrinsic charge compensation, resulting in more mass adsorption and a higher pure water permeability. PAMA-containing membranes show the most interesting results in the series. Due to its molecular structure, the chaotropicity of this polycation perfectly lies between PDADMAC and PAH. Overall, the chaotropicity of PAMA membranes allows for the formation of the right balance between extrinsic and intrinsic charge compensation with PSS. Moreover, modifying the nature of the counterions of PAMA (I(–) or Cl(–)) allows to tune the density of the multilayer and results in lower size exclusion abilities with PAMA-I compared to PAMA-Cl (higher MWCO and lower MgSO(4) retention). In general, the contextualization of the polyion interaction within the specific (poly)ion effects expands the understanding of the influence of the charge density of polycations without ignoring the chemical nature of the functional groups in their monomer units. American Chemical Society 2023-02-10 /pmc/articles/PMC10012173/ /pubmed/36935653 http://dx.doi.org/10.1021/acsapm.2c02078 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Scheepers, Daniëlle
Casimiro, Anna
Borneman, Zandrie
Nijmeijer, Kitty
Addressing Specific (Poly)ion Effects for Layer-by-Layer Membranes
title Addressing Specific (Poly)ion Effects for Layer-by-Layer Membranes
title_full Addressing Specific (Poly)ion Effects for Layer-by-Layer Membranes
title_fullStr Addressing Specific (Poly)ion Effects for Layer-by-Layer Membranes
title_full_unstemmed Addressing Specific (Poly)ion Effects for Layer-by-Layer Membranes
title_short Addressing Specific (Poly)ion Effects for Layer-by-Layer Membranes
title_sort addressing specific (poly)ion effects for layer-by-layer membranes
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10012173/
https://www.ncbi.nlm.nih.gov/pubmed/36935653
http://dx.doi.org/10.1021/acsapm.2c02078
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