Electroresponse of weak polyelectrolyte brushes

Balzer, Christopher; Wang, Zhen-Gang

doi:10.1140/epje/s10189-023-00341-3

Electroresponse of weak polyelectrolyte brushes

Journal Article · Thu Sep 14 00:00:00 EDT 2023 · European Physical Journal. E, Soft Matter (print)

DOI:https://doi.org/10.1140/epje/s10189-023-00341-3· OSTI ID:2000194

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Abstract

End-tethered polyelectrolytes are widely used to modify substrate properties, particularly for lubrication or wetting. External stimuli, such as pH, salt concentration, or an electric field, can induce profound structural responses in weak polyelectrolyte brushes, which can be utilized to further tune substrate properties. We study the structure and electroresponsiveness of weak polyacid brushes using an inhomogeneous theory that incorporates both electrostatic and chain connectivity correlations at the Debye–Hückel level. Our calculation shows that a weak polyacid brush swells under the application of a negative applied potential, in agreement with recent experimental observation. We rationalize this behavior using a scaling argument that accounts for the effect of the surface charge. We also show that the swelling behavior has a direct influence on the differential capacitance, which can be modulated by the solvent quality, pH, and salt concentration.

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Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: SC0020347

OSTI ID:: 2000194

Alternate ID(s):: OSTI ID: 2421562

Journal Information:: European Physical Journal. E, Soft Matter (print), Journal Name: European Physical Journal. E, Soft Matter (print) Journal Issue: 9 Vol. 46; ISSN 1292-8941

Publisher:: Springer Science + Business MediaCopyright Statement

Country of Publication:: France

Language:: English

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