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Deformation of the water nano-droplets on graphene under the influence of constant and alternative electric fields

Abstract

The dynamics of a water nano-droplet on a flexible graphene sheet was considered, in the presence of constant and alternative electric fields with various amplitudes and frequencies, by using a molecular dynamics method. It was found that due to the water molecules response to the electric field, the nano-droplet elongates in the field direction for the field amplitude bigger than 0.08 V/Å, which is stronger than the predicted value from the Young-Laplace equation. This difference can be described by considering the Van-der-Waals attractions between the droplet molecules and the substrate that is calculable by modifying the Young-Laplace equation. Furthermore, under the influence of an alternating field in the GHz frequency range, it was shown that the droplet shape will not change above a threshold frequency, which depends on the relaxation time of water dipole.

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Publication details

The article was received on 01 Jul 2017, accepted on 11 Sep 2017 and first published on 12 Sep 2017


Article type: Paper
DOI: 10.1039/C7CP04433J
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Deformation of the water nano-droplets on graphene under the influence of constant and alternative electric fields

    M. Kargar and A. Lohrasebi, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP04433J

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