Electrokinetic effects in nematic suspensions: Single-particle electro-osmosis and interparticle interactions

Christopher Conklin, O. M. Tovkach, Jorge Vinals, Carme Calderer, Dmitry Golovaty, Oleg D. Lavrentovich, Noel J. Walkington

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Electrokinetic phenomena in a nematic suspension are considered when one or more dielectric particles are suspended in a liquid crystal matrix in its nematic phase. The long-range orientational order of the nematic constitutes a fluid with anisotropic properties. This anisotropy enables charge separation in the bulk under an applied electric field, and leads to streaming flows even when the applied field is oscillatory. In the cases considered, charge separation is seen to result from director field distortions in the matrix that are created by the suspended particles. We use a recently introduced electrokinetic model to study the motion of a single-particle hyperbolic hedgehog pair. We find this motion to be parallel to the defect-particle center axis, independent of field orientation. For a two-particle configuration, we find that the relative force of electrokinetic origin is attractive in the case of particles with perpendicular director anchoring, and repulsive for particles with tangential director anchoring. The study reveals large scale flow properties that are respectively derived from the topology of the configuration alone and from short scale hydrodynamics phenomena in the vicinity of the particle and defect.

Original languageEnglish (US)
Article number022703
JournalPhysical Review E
Volume98
Issue number2
DOIs
StatePublished - Aug 23 2018

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Electroosmosis
osmosis
electrokinetics
Interaction
interactions
polarization (charge separation)
Defects
Charge
Long-range Order
Configuration
Motion
defects
matrices
configurations
Streaming
Liquid Crystal
Perpendicular
Anisotropy
Hydrodynamics
Electric Field

PubMed: MeSH publication types

  • Journal Article

Cite this

Electrokinetic effects in nematic suspensions : Single-particle electro-osmosis and interparticle interactions. / Conklin, Christopher; Tovkach, O. M.; Vinals, Jorge; Calderer, Carme; Golovaty, Dmitry; Lavrentovich, Oleg D.; Walkington, Noel J.

In: Physical Review E, Vol. 98, No. 2, 022703, 23.08.2018.

Research output: Contribution to journalArticle

Conklin, Christopher ; Tovkach, O. M. ; Vinals, Jorge ; Calderer, Carme ; Golovaty, Dmitry ; Lavrentovich, Oleg D. ; Walkington, Noel J. / Electrokinetic effects in nematic suspensions : Single-particle electro-osmosis and interparticle interactions. In: Physical Review E. 2018 ; Vol. 98, No. 2.
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