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Paper   IPM / Nano-Sciences / 14960
School of Nano Science
  Title:   Deformation of water nano-droplets on graphene under the influence of constant and alternative electric fields
1.  M. Kargar
2.  Amir Lohrasebi
  Status:   Published
  Journal: Physical Chem. Chemical Phys.
  Vol.:  19
  Year:  2017
  Pages:   26833
  Supported by:  IPM
The dynamics of a water nano-droplet on a flexible graphene sheet, in the presence of constant and alternative electric fields with various amplitudes and frequencies, was considered using a molecular dynamics method. It was found that because the water molecules respond to electric field, the nano-droplet elongates in the field direction for a field amplitude larger than 0.08 V A-1, 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, which can be calculated by modifying the Young-Laplace equation. Furthermore, under the influence of an alternating field over 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 the water dipole.

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