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Issue 40, 2016
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Controlling swelling/deswelling of stimuli-responsive hydrogel nanofilms in electric fields

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Abstract

The swelling/deswelling transition of pH-sensitive, electrode-grafted, hydrogel nanofilms when exposed to electric fields is studied by theoretical analysis. In acidic conditions, the response of these films to changes in pH is dominated by network–surface interactions, while intra-network electrostatic repulsions, which are highly modulated by the adsorption of salt ions, determine material response at a higher pH. Film thickness is a non-monotonic function of solution pH and displays a local maximum, a local minimum or both, depending on the salt concentration and the applied voltage. We suggest the use of these materials in the development of biosensors and control of enzyme activity.

Graphical abstract: Controlling swelling/deswelling of stimuli-responsive hydrogel nanofilms in electric fields

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Publication details

The article was received on 20 May 2016, accepted on 12 Sep 2016 and first published on 12 Sep 2016


Article type: Paper
DOI: 10.1039/C6SM01172A
Citation: Soft Matter, 2016,12, 8359-8366
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    Controlling swelling/deswelling of stimuli-responsive hydrogel nanofilms in electric fields

    G. S. Longo, M. Olvera de la Cruz and I. Szleifer, Soft Matter, 2016, 12, 8359
    DOI: 10.1039/C6SM01172A

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