Nonlinear electrophoresis in the presence of dielectric decrement

Figliuzzi, Bruno; Chan, Wai Hong Ronald; Buie, Cullen; Moran, Jeffrey L.

doi:10.1103/physreve.94.023115

Cited by 13 publications

(5 citation statements)

References 53 publications

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“…[25] for different ionic species. A similar variation in

α

has been considered by several authors [21], [26]. We have also considered the variation of the ratio between the dielectric decrement coefficients,

α_{1} / α_{2}

and found no significant difference in the result.…”

Section: Resultssupporting

confidence: 71%

“…However, it also enhances the electroosmotic flow about the charged surface, which increases the induced charge electroosmosis. The impact of surface conduction on the electrokinetics around a highly polarizable surface are discussed in several previous works, e.g., [20], [21], and the references there‐in.…”

Section: Introductionmentioning

confidence: 99%

“…The experimental results [28] established that for a moderate range of ionic concentration, i.e., below

2 M

, the dielectric permittivity can be considered to vary linearly with local concentration of the electrolyte. Several authors studied the impact of the dielectric decrement on electrokinetics near a charged surface [21],[29] and found that this phenomena reduces the surface conduction and creates depletion in counterions in the Debye layer. A nonlinear dependence of the dielectric permittivity on the ionic concentration for higher counterion concentration near a highly charged surface is considered by several authors [28], [30], [31].…”

Section: Introductionmentioning

confidence: 99%

“…The steric effects due to the finite size of ions and dielectric decrement on the electrophoresis of rigid colloids under a thin Debye layer consideration is made by Figliuzzi et al. [21]. Another important effect, the viscoelectric effect, in the context of ICEO can become pronounced when the applied electric field becomes high [27].…”

Section: Introductionmentioning

confidence: 99%

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Electrokinetic actuation of an uncharged polarizable dielectric droplet in charged hydrogel medium

2021

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Electrokinetic transport of an uncharged nonconducting microsized liquid droplet in a charged hydrogel medium is studied. Dielectric polarization of the liquid drop under the action of an externally imposed electric field induces a non‐homogeneous charge density at the droplet surface. The interactions of the induced surface charge of the droplet with the immobile charges of the hydrogel medium generates an electric force to the droplet, which actuates the drop through the charged hydrogel medium. A numerical study based on the first principle of electrokinetics is adopted. Dependence of the droplet velocity on its dielectric permittivity, bulk ionic concentration, and immobile charge density of the gel is analyzed. The surface conduction is significant in presence of charged gel, which creates a concentration polarization. The impact of the counterion saturation in the Debye layer due to the dielectric decrement of the medium is addressed. The modified Nernst–Planck equation for ion transport and the Poisson equation for the electric field is considered to take into account the dielectric polarization. A quadrupolar vortex around the uncharged droplet is observed when the gel medium is considered to be uncharged, which is similar to the induced charge electroosmosis around an uncharged dielectric colloid in free‐solution. We find that the induced charge electrokinetic mechanism creates a strong recirculation of liquid within the droplet and the translational velocity of the droplet strongly depends on its size for the dielectric droplet embedded in a charged gel medium.

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“…[25] for different ionic species. A similar variation in

α

has been considered by several authors [21], [26]. We have also considered the variation of the ratio between the dielectric decrement coefficients,

α_{1} / α_{2}

and found no significant difference in the result.…”

Section: Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

“…The experimental results [28] established that for a moderate range of ionic concentration, i.e., below

2 M

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrokinetic actuation of an uncharged polarizable dielectric droplet in charged hydrogel medium

2021

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“…The limitation of the Bikerman model is that it underestimates steric effects and the ″ υ″ packing parameter is an empirical fitting parameter. For accuracy, an unrealistically large hydrated ion size “ a ″ is used to compensate for the underestimation of liquid steric effects. , Bikerman theory leads to significant (>10%) corrections only for unreasonably large ionic radii. , …”

Section: Results and Discussionmentioning

confidence: 99%

Effect of Mixed Morphology (Simple Cubic, Face-Centered Cubic, and Body-Centered Cubic)-Based Electrodes on the Electric Double Layer Capacitance of Supercapacitors

Nigam,

Kar

2024

Langmuir

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Supercapacitors store energy due to the formation of an electric double layer (EDL) at the interface of the electrodes and electrolyte. The present article deals with the finite element study of equilibrium electric double layer capacitance (EDLC) in the mixed morphology electrodes comprising all three fundamental crystal structures, simple cubic (SC), body-centered cubic (BCC), and face-centered cubic morphologies (FCC). Mesoporous-activated carbon forms the electrode in the supercapacitor with (C 2 H 5 ) 4 NBF 4 /propylene carbonate organic electrolyte. Electrochemical interference is clearly demonstrated in the supercapacitors with the formation of the potential bands, as in the case of interference theory due to the increasing packing factor. The effects of electrode thickness varying from a wide range of 50 nm to 0.04 mm on specific EDLC have been discussed in detail. The interfacial geometry of the unit cell in contact with the electrolyte is the most important parameter determining the properties of the EDL. The critical thickness of the electrodes is 1.71 μm in all the morphologies. Polarization increases the interfacial potential and leads to EDL formation. The Stern layer specific capacitance is 167.6 μF cm −2 in all the morphologies. The maximum capacitance is in the decreasing order of interfacial geometry, as FCC > BCC > SC, dependent on the packing factor. The minimum transmittance in all the morphologies is 98.35%, with the constant figure of merit at higher electrode thickness having applications in the chip interconnects. The transient analysis shows that the interfacial current decreases with increasing polarization in the EDL. The capacitance also decreases with the increase of the scan rate.

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Multidomain Chebyshev pseudo-spectral method applied to the Poisson–Boltzmann equation for two parallel plates

2021

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Nonlinear electrophoresis in the presence of dielectric decrement

Cited by 13 publications

References 53 publications

Electrokinetic actuation of an uncharged polarizable dielectric droplet in charged hydrogel medium

Electrokinetic actuation of an uncharged polarizable dielectric droplet in charged hydrogel medium

Effect of Mixed Morphology (Simple Cubic, Face-Centered Cubic, and Body-Centered Cubic)-Based Electrodes on the Electric Double Layer Capacitance of Supercapacitors

Multidomain Chebyshev pseudo-spectral method applied to the Poisson–Boltzmann equation for two parallel plates

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