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• W2079844995 startingPage "11253" @default.
• W2079844995 abstract "Polyelectrolyte brushes with electroactive counterions provide an effective platform for surfaces with electrochemically switchable wetting properties. Polycationic poly(2-(methacryloyloxy)-ethyl-trimethyl-ammonium chloride) (PMETAC) brushes with ferricyanide ions ([Fe(CN)6] 3-) were used as the electrochemically addressable surface. After a negative potential of -0.5 V was applied to the [Fe(CN)6](3-)-coordinated PMETAC brushes, the [Fe(CN)6](3-) species were reduced to [Fe(CN)6](4-), and the surface became more hydrophilic. By application of alternating negative and positive potentials, PMETAC brushes were switched reversibly between the reduced state ([Fe(CN)6]4-) and oxidized state ([Fe(CN)6]3-), resulting in reversible changes in water contact angles. The time required for a complete contact angle change can be tuned from 1 to 20 s, by changing the brush thickness and the concentration of supporting electrolyte. We present an electrochemical brush transport model that includes the electrochemical reaction at the charged electrode and describes ion transport through the brush phase covering the electrode. The model quantitatively describes the response of the contact angle (hydrophilicity) to the applied voltage as a function of background ionic strength and brush thickness, supporting the proposed mechanism of ion transport through the brush and electrochemical reaction at the electrode. A typical diffusion constant for ferricyanide in a PMETAC brush of any thickness in 5 mM KCl supporting electrolyte was found to be 2 x 10(-15) m2 s(-1), 5 to 6 orders of magnitude smaller than its bulk solution value." @default.
• W2079844995 created "2016-06-24" @default.
• W2079844995 creator A5022792563 @default.
• W2079844995 creator A5039019390 @default.
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• W2079844995 date "2008-09-09" @default.
• W2079844995 modified "2023-09-27" @default.
• W2079844995 title "Reversible Electrochemical Switching of Polyelectrolyte Brush Surface Energy Using Electroactive Counterions" @default.
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• W2079844995 doi "https://doi.org/10.1021/la801994b" @default.
• W2079844995 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18778088" @default.
• W2079844995 hasPublicationYear "2008" @default.
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