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Electrohydrodynamics near hydrophobic surfaces

Maduar, S R ; Belyaev, A V ; Lobaskin, V ; Vinogradova, O I

Physical review letters, 2015-03, Vol.114 (11), p.118301-118301, Article 118301 [Periódico revisado por pares]

United States

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  • Título:
    Electrohydrodynamics near hydrophobic surfaces
  • Autor: Maduar, S R ; Belyaev, A V ; Lobaskin, V ; Vinogradova, O I
  • Assuntos: Boundary conditions ; Computational fluid dynamics ; Diffusion layers ; Dissipation ; Electrohydrodynamics ; Fluid flow ; Hydrodynamics ; Hydrophobic and Hydrophilic Interactions ; Models, Chemical ; Osmotic Pressure ; Slippage ; Static Electricity ; Surface Properties
  • É parte de: Physical review letters, 2015-03, Vol.114 (11), p.118301-118301, Article 118301
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: We show that an electro-osmotic flow near the slippery hydrophobic surface depends strongly on the mobility of surface charges, which are balanced by counterions of the electrostatic diffuse layer. For a hydrophobic surface with immobile charges, the fluid transport is considerably amplified by the existence of a hydrodynamic slippage. In contrast, near the hydrophobic surface with mobile adsorbed charges, it is also controlled by an additional electric force, which increases the shear stress at the slipping interface. To account for this, we formulate electrohydrodynamic boundary conditions at the slipping interface, which should be applied to quantify electro-osmotic flows instead of hydrodynamic boundary conditions. Our theoretical predictions are fully supported by dissipative particle dynamics simulations with explicit charges. These results lead to a new interpretation of zeta potential of hydrophobic surfaces.
  • Editor: United States
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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