Dielectric polarization-based separations in an ionic solution

Anand, Gaurav; Safaripour, Samira; Snoeyink, Craig

doi:10.1039/d3ra03169a

Cited by 2 publications

(2 citation statements)

References 38 publications

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“…In addition to providing a better understanding of the dielectric strength of these insulators, these results have the potential to impact several areas of science. For example, dielectrophoretic transport of molecular solutes was recently enabled through the high dielectric strength of these electrodes [38,39] as was an investigation into the effects of high electric fields on the Raman spectrum of solutions [40]. Its likely that low-cost electrowetting or other electrohydrodynamics-based applications will also benefit from the demonstrated improvement in dielectric strength.…”

Section: Discussionmentioning

confidence: 99%

A simple electrode insulation and channel fabrication technique for high-electric field microfluidics

Anand,

Safaripour,

Tercovich

et al. 2023

J. Micromech. Microeng.

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A simple and robust electrode insulation technique that can withstand a voltage as high as 1000 V, which is equivalent to an electric field strength of ∼ 1MV /m across a 10 μm channel filled with an electrolyte of conductivity ∼ 0.1 S/m, i.e., higher than sea water’s conductivity, is introduced. A multi-dielectric layers approach is adopted to fabricate the blocked electrodes, which helps reduce the number of material defects. Dielectric insulation with an exceptional breakdown electric field strength for an electrolyte confined between electrodes can have a wide range of applications in microfluidics, like high electric field strength-based dielectrophoresis. The voltage-current characteristics are studied for various concentrations of sodium chloride solution to estimate the insulation strength of the proposed materials, and the breakdown strength is calculated at the point where the electrical insulation failed. A detailed adhesion technique is also demonstrated, which will reduce the ambiguity around the fabrication of a sealed channel using SU-8

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Section: Discussionmentioning

confidence: 99%

A simple electrode insulation and channel fabrication technique for high-electric field microfluidics

Anand,

Safaripour,

Tercovich

et al. 2023

J. Micromech. Microeng.

Self Cite

View full text Add to dashboard Cite

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“…The recent growth of nano/micro technologies has introduced practical applications for confined systems in the presence of an electric field, such as electrospinning and electrospraying. − Numerous studies have investigated the combined effects of electric fields on phase transition, separation, liquid imbibition, and various phase equilibria, primarily using molecular dynamics simulations. − Some researchers have employed thermodynamic internal energy methods to better understand and estimate the effect, with a particular focus on changes in equilibrium pressure. , To the best of our knowledge, this study represents the first examination of the internal energy perspective of this phenomenon, specifically considering a polarization-based electric field and a mixture in a nano/micron channel.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of Capillary and Electric Field Effects on Liquid–Vapor Equilibrium: A Study on the Water–Ethanol Mixture

Safaripour,

Anand,

Snoeyink

2023

J. Phys. Chem. B

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This study investigates phase equilibrium manipulation in nonideal mixtures through a combined capillary and external electric field approach. Utilizing thermodynamic principles, an expression is established for estimating the equilibrium liquid mole fraction in a confined system subjected to a localized electric field within a capillary that is filled with a liquid phase in equilibrium with its vapor counterpart. Applied to a water−ethanol system, the model suggests large shifts in the equilibrium liquid mole fraction of water due to the electric field and capillary effects. These findings reveal that while the capillary's influence remains negligible for radii exceeding 10 nm, capillaries of smaller dimensions, when exposed to electric fields of around 300 MV/ m, can amplify the equilibrium liquid water mole fraction by up to 55%. This suggests the potential for phase equilibrium control through larger capillaries and lower electric fields, while intriguing complexities arise at very small radii.

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Dielectric polarization-based separations in an ionic solution

Abstract: A novel non-electrophoretic, electric field-based separation mechanism capable of transporting ions based on their dielectric properties is presented here for the first time.

Cited by 2 publications

References 38 publications

A simple electrode insulation and channel fabrication technique for high-electric field microfluidics

A simple electrode insulation and channel fabrication technique for high-electric field microfluidics

Thermodynamic Analysis of Capillary and Electric Field Effects on Liquid–Vapor Equilibrium: A Study on the Water–Ethanol Mixture

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