Behavior of Weak Polyelectrolyte Brushes in Mixed Salt Solutions
Hydrophilic and hydrophobic weak polybasic brushes immersed in aqueous solutions of mixed salt counterions are considered using a mean-field numerical self-consistent field approach. On top of the solvent quality of the polymer, the counterion-solvent interactions are accounted for by implementing Flory-Huggins interaction parameters. We show that ion specificity within the brush can bring about large changes in conformation. It is found that the collapse transition of hydrophobic, weak polyelectrolyte brushes features an intermediate two-phase state wherein a subset of chains are collapsed in a dense layer at the substrate, while the remainder of chains are well-solvated and strongly stretched away from the it. Besides pH and ionic strength, solvent quality of counterions and the composition of ions in the solvent are important control parameters for the behavior of polyelectrolyte brushes. Increasingly hydrophobic counterions penetrate deeper within the brush and stabilize the collapsed region, while hydrophilic counterions do the opposite.
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dig-wur-nl-wurpubs-5343772024-10-02 Willott, Joshua D. Murdoch, Timothy J. Leermakers, Frans A.M. De Vos, Wiebe M. Article/Letter to editor Macromolecules 51 (2018) 3 ISSN: 0024-9297 Behavior of Weak Polyelectrolyte Brushes in Mixed Salt Solutions 2018 Hydrophilic and hydrophobic weak polybasic brushes immersed in aqueous solutions of mixed salt counterions are considered using a mean-field numerical self-consistent field approach. On top of the solvent quality of the polymer, the counterion-solvent interactions are accounted for by implementing Flory-Huggins interaction parameters. We show that ion specificity within the brush can bring about large changes in conformation. It is found that the collapse transition of hydrophobic, weak polyelectrolyte brushes features an intermediate two-phase state wherein a subset of chains are collapsed in a dense layer at the substrate, while the remainder of chains are well-solvated and strongly stretched away from the it. Besides pH and ionic strength, solvent quality of counterions and the composition of ions in the solvent are important control parameters for the behavior of polyelectrolyte brushes. Increasingly hydrophobic counterions penetrate deeper within the brush and stabilize the collapsed region, while hydrophilic counterions do the opposite. en application/pdf https://research.wur.nl/en/publications/behavior-of-weak-polyelectrolyte-brushes-in-mixed-salt-solutions 10.1021/acs.macromol.7b02244 https://edepot.wur.nl/442603 Life Science https://creativecommons.org/licenses/by-nc-nd/4.0/ Wageningen University & Research |
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Life Science Life Science Willott, Joshua D. Murdoch, Timothy J. Leermakers, Frans A.M. De Vos, Wiebe M. Behavior of Weak Polyelectrolyte Brushes in Mixed Salt Solutions |
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Hydrophilic and hydrophobic weak polybasic brushes immersed in aqueous solutions of mixed salt counterions are considered using a mean-field numerical self-consistent field approach. On top of the solvent quality of the polymer, the counterion-solvent interactions are accounted for by implementing Flory-Huggins interaction parameters. We show that ion specificity within the brush can bring about large changes in conformation. It is found that the collapse transition of hydrophobic, weak polyelectrolyte brushes features an intermediate two-phase state wherein a subset of chains are collapsed in a dense layer at the substrate, while the remainder of chains are well-solvated and strongly stretched away from the it. Besides pH and ionic strength, solvent quality of counterions and the composition of ions in the solvent are important control parameters for the behavior of polyelectrolyte brushes. Increasingly hydrophobic counterions penetrate deeper within the brush and stabilize the collapsed region, while hydrophilic counterions do the opposite. |
format |
Article/Letter to editor |
topic_facet |
Life Science |
author |
Willott, Joshua D. Murdoch, Timothy J. Leermakers, Frans A.M. De Vos, Wiebe M. |
author_facet |
Willott, Joshua D. Murdoch, Timothy J. Leermakers, Frans A.M. De Vos, Wiebe M. |
author_sort |
Willott, Joshua D. |
title |
Behavior of Weak Polyelectrolyte Brushes in Mixed Salt Solutions |
title_short |
Behavior of Weak Polyelectrolyte Brushes in Mixed Salt Solutions |
title_full |
Behavior of Weak Polyelectrolyte Brushes in Mixed Salt Solutions |
title_fullStr |
Behavior of Weak Polyelectrolyte Brushes in Mixed Salt Solutions |
title_full_unstemmed |
Behavior of Weak Polyelectrolyte Brushes in Mixed Salt Solutions |
title_sort |
behavior of weak polyelectrolyte brushes in mixed salt solutions |
url |
https://research.wur.nl/en/publications/behavior-of-weak-polyelectrolyte-brushes-in-mixed-salt-solutions |
work_keys_str_mv |
AT willottjoshuad behaviorofweakpolyelectrolytebrushesinmixedsaltsolutions AT murdochtimothyj behaviorofweakpolyelectrolytebrushesinmixedsaltsolutions AT leermakersfransam behaviorofweakpolyelectrolytebrushesinmixedsaltsolutions AT devoswiebem behaviorofweakpolyelectrolytebrushesinmixedsaltsolutions |
_version_ |
1813198434511880192 |