Dielectric Polymers

Billah, Shah M. Reduwan

doi:10.1007/978-3-319-95987-0_8

Cited by 10 publications

(9 citation statements)

References 252 publications

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“…In Equation (10), the conductivity σ S can be separated by the proportionality (

), where C S describes the capacitive behavior of the sample [ 25 ]. C S is proportional to the dielectric constant ε ′ of the sample and the dielectric losses ε ″ (

) [ 50 ]. As stated earlier the dielectric losses ε ′′ can be neglected if the measuring frequency does not match a resonance in polarization [ 19 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

Differential Inductive Sensing System for Truly Contactless Measuring of Liquids′ Electromagnetic Properties in Tubing

Berger

Zygmanowski

Zimmermann

2021

Sensors

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Certain applications require a contactless measurement to eliminate the risk of sensor-induced sample contamination. Examples can be found in chemical process control, biotechnology or medical technology. For instance, in critically ill patients requiring renal replacement therapy, continuous in-line monitoring of blood conductivity as a measure for sodium should be considered. A differential inductive sensing system based on a differential transformer using a specific flow chamber has already proven suitable for this application. However, since the blood in renal replacement therapy is carried in plastic tubing, a direct measurement through the tubing offers a contactless method. Therefore, in this work we present a differential transformer for measuring directly through electrically non-conductive tubing by winding the tube around the ferrite core of the transformer. Here, the dependence of the winding type and the number of turns of the tubing on the sensitivity has been analyzed by using a mathematical model, simulations and experimental validation. A maximum sensitivity of 364.9 mV/mol/L is measured for radial winding around the core. A longitudinal winding turns out to be less effective with 92.8 mV/mol/L. However, the findings prove the ability to use the differential transformer as a truly contactless sensing system.

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“…In Equation (10), the conductivity σ S can be separated by the proportionality (

), where C S describes the capacitive behavior of the sample [ 25 ]. C S is proportional to the dielectric constant ε ′ of the sample and the dielectric losses ε ″ (

) [ 50 ]. As stated earlier the dielectric losses ε ′′ can be neglected if the measuring frequency does not match a resonance in polarization [ 19 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

Differential Inductive Sensing System for Truly Contactless Measuring of Liquids′ Electromagnetic Properties in Tubing

Berger

Zygmanowski

Zimmermann

2021

Sensors

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“…Materials, including epoxy-derived products or polyimides, have long been used in many microwave technologies as substrates and filters. Their low, thermally stable permittivity renders them suitable also for various applications towards the higher frequency range of microwaves [63]. The low cost and facile formability of polymers mean that they will continue to play an important role in mmW applications [64].…”

Section: Currently Employed Microwave Dielectric Materialsmentioning

confidence: 99%

Silicate dielectric ceramics for millimetre wave applications

Kamutzki

Schneider

Barowski

et al. 2021

Journal of the European Ceramic Society

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Silicate ceramics are of considerable promise as high frequency dielectrics in emerging millimetre wave applications including high bandwidth wireless communication and sensing. In this review, we show how high quality factors and low, thermally stable permittivities arise in ordered silicate structures. On the basis of a large number of existing studies, the dielectric performance of silicate ceramics is comprehensively summarised and presented, showing how microstructure and SiO4 tetrahedral connectivity affect polarizability and dielectric losses. We critically examine the appropriateness of silicate materials in future applications as effective millimetre wave dielectrics with low losses and tuneable permittivities. The development of new soft chemistry based processing routes for silicate dielectric ceramics is identified as being instrumental towards the reduction of processing temperatures, thus enabling silicate ceramics to be co-fired in the production of components functioning in the mm wave regime.

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“…5 They comprise polar groups which can be polarized through interfacial (Maxwell-Wagner-Sillars effect) and orientational polarization. 6 With fiber treatments (both chemical and physical), the interfacial polarization and mechanical properties can be improved significantly by the removal of hydrophilicity from the component in the fibers. 7 Ceramics offer a high dielectric constant and satisfying dielectric loss, which makes it a viable option for incorporating them in polymer composites.…”

Section: Introductionmentioning

confidence: 99%

“…Also, the inclusions of reinforcements like natural fibers also provide good dielectric properties with the presence of cellulose, hemicellulose, lignin, and pectin 5 . They comprise polar groups which can be polarized through interfacial (Maxwell‐Wagner‐Sillars effect) and orientational polarization 6 . With fiber treatments (both chemical and physical), the interfacial polarization and mechanical properties can be improved significantly by the removal of hydrophilicity from the component in the fibers 7…”

Section: Introductionmentioning

confidence: 99%

Characterization study of flax/strontium titanate/polypropylene composite for low‐k dielectric applications

P.V.S.

Jayamani

Soon

et al. 2021

J of Applied Polymer Sci

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This study demonstrates the characterization of flax fiber reinforced polypropylene-strontium titanate composite and dielectric study for low-k dielectric applications. The composite was studied through thermal, morphological, and compositional aspects. Thermogravimetry analysis, differential scanning calorimetry shows a higher thermal stability with low glass transition temperatures and lowered decomposition temperatures of 375 C. The morphological study on the surface of this composites had revealed closely packed layers of fiber, ceramic and polymer matrix, which deduces the increased dielectric constants between 3.92 and 4.25 after the addition of strontium titanate. The dielectric constant was found to be significantly higher with a 78% increase with strontium titanate inclusion at relaxation frequencies between 1 kHz and 2 MHz, respectively. Besides, the dielectric property data showed that dielectric permittivity of 4.2 (low k) with the inclusion of natural fibers and ceramic at higher frequencies and lowered corresponding dielectric losses. The infrared spectroscopy results also show a reduction in hydroxyl groups and confirms the presence of bonds that are subjected to high interfacial bonding.

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Dielectric Polymers

Cited by 10 publications

References 252 publications

Differential Inductive Sensing System for Truly Contactless Measuring of Liquids′ Electromagnetic Properties in Tubing

Differential Inductive Sensing System for Truly Contactless Measuring of Liquids′ Electromagnetic Properties in Tubing

Silicate dielectric ceramics for millimetre wave applications

Characterization study of flax/strontium titanate/polypropylene composite for low‐k dielectric applications

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