Apparatus and method to measure dielectric properties (ε′ and ε″) of ionic liquids

Göllei, Attila; Vass, A.; Pallai, E.; Gerzson, Miklós; Mink, J.

doi:10.1063/1.3117352

Cited by 14 publications

(11 citation statements)

References 8 publications

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“…From reflection measurements of our samples we can conclude that our material is conductive. In [17][18][19] …”

Section: Discussion About Bulk Materials Of Examined Samplesmentioning

confidence: 99%

Characterization of Open Cell Sic Foam Material

Živković¹,

Murk²

2012

PIER B

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Abstract-This paper presents characterization and modeling of microwave characteristics of SiC foam material. Transmission and reflection measurements are performed in X, K and Ka band for the samples of two different pore sizes and three different thicknesses. Effective and frequency dependent dielectric permittivity is extracted for 50PPI 10 mm sample, while for the other samples it was not possible because of density gradient in the samples. By calculation of Mie scattering efficiencies approximate magnitude of dominant loss mechanism (scattering or absorption) at certain frequencies is predicted.

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“…From reflection measurements of our samples we can conclude that our material is conductive. In [17][18][19] …”

Section: Discussion About Bulk Materials Of Examined Samplesmentioning

confidence: 99%

Characterization of Open Cell Sic Foam Material

Živković¹,

Murk²

2012

PIER B

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“…If the theoretical relationships of the temperature dependence of dielectric parameters are not available a microwave dielectrometer can be used to establish the necessary equations [7]. As an example the temperature dependence of dielectric parameters have been defined in case of ethanol and glycerol using this method and the resulted relationships have been substituted into the model described above.…”

Section: The Modelmentioning

confidence: 99%

Investigating Energetic and Impedance Relations of Microwave Transmission Line Filled with Dielectric Material

Göllei¹,

Magyar²,

Gerzson³

2010

PIERS Online

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During microwave treatment, microwave energy is transferred to a material sample placed in an applicator of given geometric parameters. As a result of the energy transfer, the sample absorbs energy from the microwave field depending on its dielectric properties. The degree of energy absorption is directly proportional to the dielectric loss and proportional to the square root of the dielectric constant. The temperature of the sample continuously increases due to the energy transfer and the dielectric properties of the sample also change with the rising temperature. Although the microwave energy supply is constant, time and temperature dependent energy impedance and dielectric relations are developed. A part of them is measurable, but the other part of them can not be directly measured, they can only be computed from the previously measured ones. In a closed model which contains the parameters of the sample and the waveguide, the continuously changing parameters can be determined in relation of the temperature. These parameters are as follows: Attenuation of the transmission line, temporal change of the sample temperature, dielectric properties of the sample, loss factor of the sample, penetration depth, impedance of the transmission line, standing wave ratio reflection factor. The above parameters can be modeled as a function of the sample's temperature or as a function of time.

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“…The speed of the change in temperature depends on the electrical field strength in the material (E), the absorbed microwave power, (P v ) density (ρ), the specific heat capacity (C p ) and the dielectric loss factor ε″ and can be given by Eq. (1) [11].…”

Section: Measurement Set-up Of Ionic Liquidsmentioning

confidence: 99%

“…The formula gives the speed of temperature change; on the other hand, the integral of the formula with respect to time gives the value of the temperature in the sample as a function of time. The temperature dependence of the dielectric parameters (ε′, ε″) of the sample can be measured with a microwave dielectrometer designed by the author of this paper [11]; thus, it is possible to define the relationships ε′(T) and ε″(T) regarding the specific sample material by fitting polynomials on the resulted data.…”

Section: Modelling Of Power and Temperature Dependence Of Ionic Liquidsmentioning

confidence: 99%

Dielectric Characteristics of Ionic Liquids and Usage in Advanced Energy Storage Cells

Göllei¹

2017

Progress and Developments in Ionic Liquids

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Before the application of ionic liquids, it is important to know their fundamental physical and chemical properties. Practical experience has shown that it is important to look at these materials in the behaviour of the function frequency and temperature. To understand obtained information understanding the molecular-physic bases is needed. Research and application of ionic liquids have attracted an increasing attention in the areas of nuclear industry, oil and gas industry, petrochemical industry, chemical and electrochemical industry. The number of studies dealing with the question is proliferating which opens up new horizons in the field of chemical operations in microwave field with ionic liquids (organic chemical synthesis, catalytic operations, etc.). As a result of the relatively high destroying temperature of ionic liquids, a wider temperature range of operations can be done and it offers environmental friendly solution in the replacement of the toxic solvents with generally low evaporating temperatures. The area of application is becoming more widespread as electrolyte of novel battery cells. Being aware of the physical and chemical properties of ionic liquids is necessary in order to apply them. The main goal of this research was to test the dielectric properties, viscosity and temperature dependence of the electrical conductivity. Based on our results, we can claim that significant temperature dependence of the three properties can be shown in the case of ionic liquids. These findings are crucial for the usability of applications, planning and preparing of production and optimization processes. The significance and importance of these results become even more obvious if we consider the fact that these energy storage cells are exposed to large temperature differences. The present study discusses the

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Apparatus and method to measure dielectric properties (ε′ and ε″) of ionic liquids

Cited by 14 publications

References 8 publications

Characterization of Open Cell Sic Foam Material

Characterization of Open Cell Sic Foam Material

Investigating Energetic and Impedance Relations of Microwave Transmission Line Filled with Dielectric Material

Dielectric Characteristics of Ionic Liquids and Usage in Advanced Energy Storage Cells

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