Dielectric Properties of Aqueous Ionic Solutions at Microwave Frequencies

Harris, Frank E.; O’Konski, Chester T.

doi:10.1021/j150549a009

Cited by 108 publications

(65 citation statements)

References 1 publication

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“…4d) that the distribution factor (a) is indistinguishable from zero at low concentrations but increases gradually with concentration reaching nearly 0.2 at c ¼ 5 mol/L. A similar trend was observed by Büchner et al [1999] and Harris and O'Konski [1957]. …”

Section: Discussionsupporting

confidence: 73%

Complex permittivity of sodium chloride solutions at microwave frequencies

Peyman

Gabriel

Grant

2007

Bioelectromagnetics

230

184

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Section: Discussionsupporting

confidence: 73%

Complex permittivity of sodium chloride solutions at microwave frequencies

Peyman

Gabriel

Grant

2007

Bioelectromagnetics

230

184

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“…Direct current (or an extremely low frequency) will cause electrolysis and polarize the electrodes. At the other extreme, an extremely high frequency will increase the conductivity of the solution by the Debye-Falkenhagen effect [39]. As previously shown, at frequencies between 40 Hz and 10 MHz, the real part of the impedance will slowly decrease in a predictable way [23].…”

Section: Electrical Interfacementioning

confidence: 89%

A Soft Strain Sensor Based on Ionic and Metal Liquids

et al. 2013

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Abstract-A novel soft strain sensor capable of withstanding strains of up to 100% is described. The sensor is made of a hyperelastic silicone elastomer that contains embedded microchannels filled with conductive liquids. This is an effort of improving the previously reported soft sensors that uses a single liquid conductor. The proposed sensor employs a hybrid approach involving two liquid conductors: an ionic solution and an eutectic gallium-indium alloy. This hybrid method reduces the sensitivity to noise that may be caused by variations in electrical resistance of the wire interface and undesired stress applied to signal routing areas. The bridge between these two liquids is made conductive by doping the elastomer locally with nickel nanoparticles. The design, fabrication, and characterization of the sensor are presented.Index Terms-Wearable sensors, microfluidics, strain measurement, ionic solution, eutectic gallium indium (eGaIn).

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“…This problem, first studied by Wilson & Taylor (1925), was originally analyzed under the premise that normal electric stresses acting on an uncharged interface are responsible for deformations (O'Konski & Thacher 1953;Harris & O'Konski 1957). Normal stresses, however, can only result in prolate deformations, while experiments have been known to show both prolate and oblate shapes depending on material properties (Allan & Mason 1962).…”

Section: Introductionmentioning

confidence: 99%

A nonlinear small-deformation theory for transient droplet electrohydrodynamics

Das¹,

Saintillan²

2016

J. Fluid Mech.

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The deformation of a viscous liquid droplet suspended in another liquid and subject to an applied electric field is a classic multiphase flow problem best described by the MelcherTaylor leaky dielectric model. The main assumption of the model is that any net charge in the system is concentrated on the interface between the two liquids as a result of the jump in Ohmic currents from the bulk. Upon application of the field, the drop can either attain a steady prolate or oblate shape with toroidal circulating flows both inside and outside arising from tangential stresses on the interface due to action of the field on the surface charge distribution. Since the pioneering work of Taylor (1966), there have been numerous computational and theoretical studies to predict the deformations measured in experiments. Most existing theoretical models, however, have either neglected transient charge relaxation or nonlinear charge convection by the interfacial flow. In this work, we develop a novel small-deformation theory accurate to second order in electric capillary number O(Ca 2 E ) for the complete Melcher-Taylor model that includes transient charge relaxation, charge convection by the flow, as well as transient shape deformation. The main result of the paper is the derivation of coupled evolution equations for the induced electric multipoles and for the shape functions describing the deformations on the basis of spherical harmonics. Our results, which are consistent with previous models in the appropriate limits, show excellent agreement with fully nonlinear numerical simulations based on an axisymmetric boundary-element formulation and with existing experimental data in the small-deformation regime.

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Dielectric Properties of Aqueous Ionic Solutions at Microwave Frequencies

Cited by 108 publications

References 1 publication

Complex permittivity of sodium chloride solutions at microwave frequencies

Complex permittivity of sodium chloride solutions at microwave frequencies

A Soft Strain Sensor Based on Ionic and Metal Liquids

A nonlinear small-deformation theory for transient droplet electrohydrodynamics

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