Electrokinetic flows in liquid crystal thin films with fixed anchoring

Conklin, Christopher; Viñals, Jorge

doi:10.1039/c6sm02393b

Cited by 10 publications

(14 citation statements)

References 26 publications

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“…In order to examine the correlation between the velocity and material properties, to gain a further insight into the charge distribution and flow field induced by the applied field, and to test the effect of surface anchoring on director deformation, we have developed a computational model of the transport equations [34]. We consider a 2D…”

Section: Correlation Of Velocity Reversals and Materials Properties: Nmentioning

confidence: 99%

Nonlinear Electrophoresis of Colloids Controlled by Anisotropic Conductivity and Permittivity of Liquid-Crystalline Electrolyte

et al. 2017

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Liquid crystal electrolytes enable nonlinear electrophoresis of colloidal particles with velocities proportional to the square of the applied field. We demonstrate that the magnitude and even the polarity of electrophoretic mobility can be controlled by the anisotropy of electric conductivity and dielectric permittivity of the liquid crystal. In particular, reversal of electrophoretic mobility can be triggered either by temperature or composition changes that alter the signs of the conductivity and permittivity anisotropies. Controllable reversal of mobility adds to the list of advantages of anisotropic electrolytes over their isotropic counterparts. † olavrent@kent.edu

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Section: Correlation Of Velocity Reversals and Materials Properties: Nmentioning

confidence: 99%

Nonlinear Electrophoresis of Colloids Controlled by Anisotropic Conductivity and Permittivity of Liquid-Crystalline Electrolyte

et al. 2017

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“…We scale spatial variables with particle radius R and time by the inverse frequency of the applied field ω −1 . The scale of the charge density is [30] 0 ⊥ E 0 /R, while the total ionic concentration is scaled by its average c 0 . The scale of the flow velocity is [30] 0 ⊥ E 2 0 R/α 4 , and the pressure scale is 0 ⊥ E 2 0 .…”

Section: Model and Configurations Of Interestmentioning

confidence: 99%

“…The scale of the charge density is [30] 0 ⊥ E 0 /R, while the total ionic concentration is scaled by its average c 0 . The scale of the flow velocity is [30] 0 ⊥ E 2 0 R/α 4 , and the pressure scale is 0 ⊥ E 2 0 . The resulting set of dimensionless equations reads,…”

Section: Model and Configurations Of Interestmentioning

confidence: 99%

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

et al. 2018

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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.

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“…We scale spatial variables by system size L, and the total ionic concentration C = c 1 + c 2 by its average c 0 . The scale of the charge density is 18 ε 0 ε ⊥ E x /L, while the scale of the flow velocity and pressure are 18…”

Section: Variable Orientation Electric Field As the Analog Of Active mentioning

confidence: 99%

A connection between living liquid crystals and electrokinetic phenomena in nematic fluids

2018

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We develop a formal analogy between configurational stresses in physically distinct systems, and study the flows that they induce when the configurations of interest include topological defects. Our primary focus is on electrokinetic flows in a nematic fluid under an applied electrostatic field, which we compare with a class of systems in which internal stresses are generated due to configurational changes (e.g., active matter, liquid crystal elastomers). The mapping allows the extension, within certain limits, of existing results on transport in electrokinetic systems to active transport. We study motion induced by a pair of point defects in a dipole configuration, and steady rotating flows due to a swirling vortex nematic director pattern. The connection presented allows the design of electrokinetic experiments that correspond to particular active matter configurations that may be easier to conduct and control in the laboratory.

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Electrokinetic flows in liquid crystal thin films with fixed anchoring

Cited by 10 publications

References 26 publications

Nonlinear Electrophoresis of Colloids Controlled by Anisotropic Conductivity and Permittivity of Liquid-Crystalline Electrolyte

Nonlinear Electrophoresis of Colloids Controlled by Anisotropic Conductivity and Permittivity of Liquid-Crystalline Electrolyte

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

A connection between living liquid crystals and electrokinetic phenomena in nematic fluids

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