The specific ion response of polyelectrolyte brushes depends on polymer and anion hydrophilicity

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dc.contributor.authorMurdoch, TJen_AU
dc.contributor.authorWillott, JDen_AU
dc.contributor.authorde Vos, WMen_AU
dc.contributor.authorNelson, Aen_AU
dc.contributor.authorPrescott, SWen_AU
dc.contributor.authorWanless, Een_AU
dc.contributor.authorWebber, JBen_AU
dc.date.accessioned2021-10-26T21:46:54Zen_AU
dc.date.available2021-10-26T21:46:54Zen_AU
dc.date.issued2016-11-29en_AU
dc.date.statistics2021-10-11en_AU
dc.description.abstractWe have previously shown that the pH and ionic strength response of weak, polybasic brushes is dependent on the location of the counterion within the Hofmeister series and the relative hydrophobicity of the polymer.[1-3] Recent measurements of a hydrophobic poly(2-diisopropylamino) ethyl methacrylate (PDPA) brush on Platypus reflectometer show that a collapsed conformation independent of anion identity is formed at low ionic strength, 0.1 mM. At higher ionic strengths, up to 500 mM, extended conformations are observed in potassium acetate solutions, while potassium thiocyanate solutions collapse the brush. Numerical self consistent field (nSCF) calculations allowed previous hypotheses regarding the accumulation and hydration strength of the counterions to be tested. Addition of a single Flory-Huggins interaction parameter (χ) analogous to the anion hydrophilicity was sufficient to replicate the measured brush behaviour.en_AU
dc.identifier.citationMurdoch, T. J., Willott, J. D., de Vos, W. M., Nelson, A., Prescott, S. W., Wanless, E. J., & Webber, J. B. (2016). The specific ion response of polyelectrolyte brushes depends on polymer and anion hydrophilicity. Paper presented at 13th AINSE-ANBUG Neutron Scattering Symposium, Sydney, NSW, Australia, 29-30 November 2016.en_AU
dc.identifier.conferenceenddate30 November 2016en_AU
dc.identifier.conferencename13th AINSE-ANBUG Neutron Scattering Symposiumen_AU
dc.identifier.conferenceplaceSydney, NSW, Australiaen_AU
dc.identifier.conferencestartdate29 November 2016en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12099en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Nuclear Science and Engineeringen_AU
dc.subjectPolymersen_AU
dc.subjectNeutron reflectorsen_AU
dc.subjectAnionsen_AU
dc.subjectPotassiumen_AU
dc.subjectHydrationen_AU
dc.subjectNumerical analysisen_AU
dc.titleThe specific ion response of polyelectrolyte brushes depends on polymer and anion hydrophilicityen_AU
dc.typeConference Abstracten_AU
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