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Issue 30, 2018
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Molecular simulations of the piezoionic effect

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We present a molecular dynamics study of two polyelectrolyte gels with different degrees of ionization coupled in a slab geometry. Our simulations show that a pressure gradient emerges between the two gels that results in the buildup of a Nernst–Donnan potential. This methodology is reverse to experiments of the piezoionic or mechanoelectric effect, in which an electric potential gradient appears upon application of a pressure gradient to a hydrogel. The Nernst–Donnan potential at the interface is found to scale linearly with temperature with the coefficient of proportionality given by the fraction of concentrations of the uncondensed counterions. We show that the potential difference can also be expressed as a linear function of the lateral pressure, thus providing a molecular interpretation of the piezoionic effect.

Graphical abstract: Molecular simulations of the piezoionic effect

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Publication details

The article was received on 08 May 2018, accepted on 30 Jun 2018 and first published on 06 Jul 2018

Article type: Paper
DOI: 10.1039/C8SM00939B
Citation: Soft Matter, 2018,14, 6222-6229
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    Molecular simulations of the piezoionic effect

    V. Triandafilidi, S. G. Hatzikiriakos and J. Rottler, Soft Matter, 2018, 14, 6222
    DOI: 10.1039/C8SM00939B

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