A general model of dielectric constant for porous materials

Liu, Xing-Da; Hou, Zhi‐Ling; Zhang, Bao-Xun; Zhan, Ke; He, Peng; Zhang, Kailun; Song, Wei‐Li

doi:10.1063/1.4943639

Cited by 48 publications

(33 citation statements)

References 35 publications

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“…[13, p. 83]). As the porosity increases, the high-frequency real part of the relative dielectric permittivity decreases, as expected [14], [15]. The dielectric permittivity, however, does not exhibit a well defined trend with porosity at the low frequency end of the spectrum, increasing from the 5% porosity sample to that of 35% and, finally, 15% porosity.…”

Section: B Dielectric Permittivity Of Porous Aluminamentioning

confidence: 91%

Python GUI for impedance spectroscopy analysis

Rech¹,

Perottoni²

2018

Sci. cum Ind.

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A graphical user interface (GUI) for a widely used instrument, namely the Keysight 4294A impedance analyzer, was developed in Python language. This GUI allows control of instrument, acquisition and processing of impedance spectra from dielectric materials and electric circuits. Examples of analysis of electric circuits and porous alumina are provided to illustrate some of the GUI possible applications.

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Section: B Dielectric Permittivity Of Porous Aluminamentioning

confidence: 91%

Python GUI for impedance spectroscopy analysis

Rech¹,

Perottoni²

2018

Sci. cum Ind.

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“…Here, a = 0.127 mm and d = 0.475 mm, measured from the optical image of the fiber tip cross-section. We used the following formula to find the value of ε e f f [61]:…”

Section: Sensor's Sensitivitymentioning

confidence: 99%

Scalable Fabrication of Highly Flexible Porous Polymer-Based Capacitive Humidity Sensor Using Convergence Fiber Drawing

et al. 2019

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In this study, we fabricated a highly flexible fiber-based capacitive humidity sensor using a scalable convergence fiber drawing approach. The sensor’s sensing layer is made of porous polyetherimide (PEI) with its porosity produced in situ during fiber drawing, whereas its electrodes are made of copper wires. The porosity induces capillary condensation starting at a low relative humidity (RH) level (here, 70%), resulting in a significant increase in the response of the sensor at RH levels ranging from 70% to 80%. The proposed humidity sensor shows a good sensitivity of 0.39 pF/% RH in the range of 70%–80% RH, a maximum hysteresis of 9.08% RH at 70% RH, a small temperature dependence, and a good stability over a 48 h period. This work demonstrates the first fiber-based humidity sensor fabricated using convergence fiber drawing.

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“…100 [ 12 ]) in composites, researchers have to incorporate ferroelectric ceramic at a rather high volume content based on binary series and parallel dielectric models [ 13 , 14 ]. Unfortunately, uneven dispersions and aggregation of the ceramic in polymer would be induced, resulting in the reduced flexibility and mechanical robustness of the composites [ 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. Furthermore, if nanosized ceramic filler with ultrahigh surface energy is introduced at a very high concentration, the mechanical characteristics would deteriorate.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Dielectric and Mechanical Properties of Ternary Composites via Plasticizer-Induced Dense Interfaces

Feng

Peng

et al. 2018

Materials

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High overall performance, including high dielectric constant, low loss, high breakdown strength, fine flexibility, and strong tensile properties, is difficult to achieve simultaneously in polymer nanocomposites. In our prior work, we modified the surfaces of alpha-SiC nanoparticles and chemically cross-linked the polymeric matrix to simultaneously promote the dielectric and mechanical properties of composites. In this work, a novel strategy of high-temperature plastification towards a polymeric matrix has been proposed to fabricate ternary nanocomposites with balanced dielectric and mechanical characteristics by the solution cast method in order to reduce costs and simplify steps during large-scale preparation. Poly(vinylidene fluoride-chlorotrifluoroethylene) with inner double bonds as matrix, unfunctionalized alpha-SiC nanoparticles (NPs) as filler, and dibutyl phthalate (DBP) as plasticizer were employed. By introducing DBP and high-temperature treatment, the dispersion of NPs and the degree of compactness of the interface regions were both improved due to the reduced cohesion of the fluoropolymer, resulting in an increase in the dielectric constant (by 30%) and breakdown strength (by 57%) as well as the lowering of loss (by 30%) and conductivity (by 16%) in nanocomposites. Moreover, high-temperature plastification contributed to the promotion of flexible and tensile properties. This work might open the door to large-scale fabrication of nanocomposite dielectrics with high overall properties through the cooperation of the plasticizer and high temperature.

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A general model of dielectric constant for porous materials

Cited by 48 publications

References 35 publications

Python GUI for impedance spectroscopy analysis

Python GUI for impedance spectroscopy analysis

Scalable Fabrication of Highly Flexible Porous Polymer-Based Capacitive Humidity Sensor Using Convergence Fiber Drawing

Enhanced Dielectric and Mechanical Properties of Ternary Composites via Plasticizer-Induced Dense Interfaces

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