Dielectric constant, dielectric loss, conductivity, capacitance and model analysis of electronic electroactive polymers

Wang, Hong; Yang, Liang

doi:10.1016/j.polymertesting.2023.107965

Cited by 38 publications

(9 citation statements)

References 28 publications

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“…As can be seen from Figure 4 b, the dielectric constant of the composites increased with the increase in F-graphene content, and the dielectric constant of pure epoxy resin was 4.86 at 1 kHz frequency, while that of F-graphene/epoxy composites reached 8.23 at an F-graphene loading of 1.0 wt.%, which was about 1.69 times that of pure epoxy. This can be attributed to the interfacial polarization effect introduced by F-graphene nanofiller doping, i.e., because of the significant difference in dielectric properties (e.g., polarity and dielectric constant) between inorganic F-graphene and organic epoxy resin matrix, a high-intensity local electric field is formed at the interface of the two phases, and the free electrons generated within the composite dielectric under the applied electric field are captured at the interface of the two phases, i.e., the charge accumulates in the interfacial region with high field strength, which leads to the increase in space charge within the composites and thus the elevation of the dielectric constant [ 55 , 56 , 57 , 58 , 59 ]. In this study, the interfacial polarization effect can be explained more intuitively by the micro-capacitance model [ 60 , 61 ].…”

Section: Resultsmentioning

confidence: 99%

Enhanced Thermal Conductivity and Dielectric Properties of Epoxy Composites with Fluorinated Graphene Nanofillers

et al. 2023

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The demand for high-performance dielectrics has increased due to the rapid development of modern electric power and electronic technology. Composite dielectrics, which can overcome the limitations of traditional single polymers in thermal conductivity, dielectric properties and mechanical performance, have received considerable attention. In this study, we report a multifunctional nanocomposite material fabricated by blending fluorinated graphene (F-graphene) with epoxy resin. The F-graphene/epoxy composite exhibited a high thermal conductivity of 0.3304 W·m−1·K−1 at a low filler loading of 1.0 wt.%, which was 67.63% higher than that of pure epoxy. The composite dielectric also showed high breakdown strength (78.60 kV/mm), high dielectric constant (8.23), low dielectric loss (<0.015) and low AC conductivity (<10−11 S·m−1). Moreover, the composite demonstrated high thermal stability and strong mechanical strength. It is believed that the F-graphene/epoxy composite has outstanding performance in various aspects and can enable the development and manufacturing of advanced electric power and electronic equipment devices.

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Section: Resultsmentioning

confidence: 99%

Enhanced Thermal Conductivity and Dielectric Properties of Epoxy Composites with Fluorinated Graphene Nanofillers

et al. 2023

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“…The study of dielectric relaxation is very important to understand the origin of dielectric losses as a potential tool for the determination of the structure and defects existing in solids. The complex dielectric function for the investigated organic dye is expressed by the Debye equation [ 62 ],

where ( ω ) and ( ω ) are the real and imaginary parts of the dielectric constant, respectively. The values of ( ω ) and ( ω ) were determined from the measurements of the capacitance and loss tangent tanδ under different temperatures and frequencies.…”

Section: Resultsmentioning

confidence: 99%

Physical Properties of E143 Food Dye as a New Organic Semiconductor Nanomaterial

Alyami,

Alotibi

2023

Nanomaterials

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Organic semiconductors (OSCs) have attracted considerable attention for many promising applications, such as organic light-emitting diodes (OLEDs), organic field-effect transistors (OFETs), and organic photovoltaics (OPVs). The present work introduced E143 food dye as a new nanostructured organic semiconductor that has several advantages, such as low cost, easy fabrication, biocompatibility, and unique physical properties. The material was characterized using a transmission electron microscope (TEM), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), and optical absorption spectroscopy. The study of X-ray diffraction (XRD) showed that E143 dye has a monoclinic polycrystalline structure. Electrical and dielectric properties were performed by impedance spectroscopy at frequencies (20 Hz–1 MHz) in the temperature range (303–473 K). The values of interband transitions and activation energy recommended the application of E143 dye as a new organic semiconductor material with promising stability, especially in the range of hot climates such as KSA.

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“…Although the research and development of IHMs faces severe challenges, researchers have made several attempts to obtain hemostatic materials with good donor supply, shelf life and refrigeration. The structural design of different materials makes an impact on the final performance as well [51][52][53][54][55]. This section will summarize the recent research progress of these hemostatic materials, focusing on the synthesis strategy of IHMs, as shown in Figure 4.…”

Section: Synthetic Strategies Of Ihmsmentioning

confidence: 99%

Applications of injectable hemostatic materials in wound healing: principles, strategies, performance requirements, and future perspectives

Wang,

Yang

2023

Theranostics

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Uncontrolled traumatic bleeding can lead to death due to excessive blood loss within minutes. Early intervention is crucial to save lives, making timely and effective hemostasis is a major global challenge. Injectable hemostatic materials (IHMs) have been proposed to improve the effectiveness of hemostasis, facilitate wound healing, and enhance survival rates in emergency situations. The superior hemostatic performance of IHMs has garnered significant attention. However, there are relatively few comprehensive reviews on IHMs. This paper aims to provide a comprehensive review of the latest research progress on IHMs in recent years. Firstly, the physiological hemostatic process and the underlying principles of hemostasis are analyzed. Subsequently, the synthesis strategies for different IHMs are discussed. The performance requirements of IHMs are then summarized, including high efficiency, biocompatibility, degradability, manipulability, stability and antibacterial ability. Finally, the development prospects and challenges of IHMs are presented. This review serves as a necessary and systematic summary of IHMs, providing a valuable reference for the development of new high-performance hemostatic materials and their practical clinical applications.

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Dielectric constant, dielectric loss, conductivity, capacitance and model analysis of electronic electroactive polymers

Cited by 38 publications

References 28 publications

Enhanced Thermal Conductivity and Dielectric Properties of Epoxy Composites with Fluorinated Graphene Nanofillers

Enhanced Thermal Conductivity and Dielectric Properties of Epoxy Composites with Fluorinated Graphene Nanofillers

Physical Properties of E143 Food Dye as a New Organic Semiconductor Nanomaterial

Applications of injectable hemostatic materials in wound healing: principles, strategies, performance requirements, and future perspectives

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