Electrostatic force on a spherical particle confined between two planar surfaces

Wang, Zhanwen; Miksis, Michael J.; Vlahovska, Petia M.

doi:10.1039/d3sm00934c

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2024

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Cited by 3 publications

(2 citation statements)

References 46 publications

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“…4,5 Recent work shows that these distinct equilibria exhibit vastly different responses to shape perturbation upon localized forcing. 6…”

Section: Introductionmentioning

confidence: 99%

Shape equilibria of vesicles with rigid planar inclusions

Jeon,

Fagnoni,

Wan

et al. 2024

Soft Matter

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“…4,5 Recent work shows that these distinct equilibria exhibit vastly different responses to shape perturbation upon localized forcing. 6…”

Section: Introductionmentioning

confidence: 99%

Shape equilibria of vesicles with rigid planar inclusions

Jeon,

Fagnoni,

Wan

et al. 2024

Soft Matter

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show abstract

“…ionic impurities can strongly affect the system's responsiveness. 40,48 Thus, it is possible that several electrohydrodynamic instabilities are involved, and future work on low-field-responsive systems is needed. 40,41…”

mentioning

confidence: 99%

Propulsion of zwitterionic surfactant-stabilized water-in-oil droplets by low electric fields

Gustavsson,

Peng,

Plamont

et al. 2024

Chem. Commun.

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Electrohydrodynamic flow about a colloidal particle suspended in a non-polar fluid

Wang,

Miksis,

Vlahovska

2024

J. Fluid Mech.

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Nonlinear electrokinetic phenomena, where electrically driven fluid flows depend nonlinearly on the applied voltage, are commonly encountered in aqueous suspensions of colloidal particles. A prime example is the induced-charge electro-osmosis, driven by an electric field acting on diffuse charge induced near a polarizable surface. Nonlinear electrohydrodynamic flows also occur in non-polar fluids, driven by the electric field acting on space charge induced by conductivity gradients. Here, we analyse the flows about a charge-neutral spherical solid particle in an applied uniform electric field that arise from conductivity dependence on local field intensity. The flow pattern varies with particle conductivity: while the flow about a conducting particle has a quadrupolar pattern similar to induced-charge electro-osmosis, albeit with opposite direction, the flow about an insulating particle has a more complex structure. We find that this flow induces a force on a particle near an electrode that varies non-trivially with particle conductivity: while it is repulsive for perfectly insulating particles and particles more conductive than the suspending medium, there exists a range of particle conductivities where the force is attractive. The force decays as the inverse square of the distance to the electrode and thus can dominate the dielectrophoretic attraction due to the image dipole, which falls off with the fourth power with the distance. This electrohydrodynamic lift opens new possibilities for colloidal manipulation and driven assembly by electric fields.

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Electrostatic force on a spherical particle confined between two planar surfaces

Abstract: A charge-free particle in a uniform electric field experiences no net force in an unbounded domain. A boundary, however, breaks the symmetry and the particle can be attracted or repelled...

Cited by 3 publications

References 46 publications

Shape equilibria of vesicles with rigid planar inclusions

Shape equilibria of vesicles with rigid planar inclusions

Propulsion of zwitterionic surfactant-stabilized water-in-oil droplets by low electric fields

Electrohydrodynamic flow about a colloidal particle suspended in a non-polar fluid

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