Charge Transport in LDPE Nanocomposites Part II—Computational Approach

Hoang, Anh T.; Serdyuk, Yuriy V.; Gubanski, Stanislaw

doi:10.3390/polym8040103

Cited by 49 publications

(75 citation statements)

References 30 publications

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“…A more sophisticated model has to be developed to tackle this question, based on a microscopic approach incorporating charge generation at the electrodes, their nature (electrons, holes, ions), their transport in the volume, etc. Such models have been implemented, particularly during the last decade and applied mainly to polyethylene materials [25][26][27][28]. They feature bipolar transport, and consider charge generation at the electrodes, trapping, and recombination.…”

Section: Discussionmentioning

confidence: 99%

Maxwell–Wagner Effect in Multi-Layered Dielectrics: Interfacial Charge Measurement and Modelling

Teyssèdre

Roy

et al. 2017

Technologies

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Abstract:The development of high voltage direct current (HVDC) technologies generates new paradigms in research. In particular and contrary to the AC case, investigation of electrical conduction is not only needed for understanding the dielectric breakdown but also to describe the field distribution inside the insulation. Here, we revisit the so-called Maxwell-Wagner effect in multi-layered dielectrics by considering on the one hand a non-linear field dependent model of conductivity and on the other hand by performing space charge measurements giving access to the interfacial charge accumulated between different dielectrics. We show that space charge measurements give access to the amount of interfacial charge built-up by the Maxwell-Wagner effect between two dielectrics of different natures. Measurements also demonstrate that the field distribution undergoes a transition from a capacitive distribution to a resistive one, under long lasting stress.

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Section: Discussionmentioning

confidence: 99%

Maxwell–Wagner Effect in Multi-Layered Dielectrics: Interfacial Charge Measurement and Modelling

Teyssèdre

Roy

et al. 2017

Technologies

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“…At the anode, holes are injected into the insulation and move toward the cathode, and hole traps with different depths also exist. Besides trapping, electrons and holes may recombine in the dielectric, an event which occurs more frequently at higher temperatures, as observed by simulations of charge transport in dielectrics . The migration of charges depends not only on the depth of traps and on the degree of recombination but also on the trap density.…”

Section: Charge Transport Mechanisms In Nanocomposite‐based Insulatiomentioning

confidence: 97%

“…On the other hand, the nanoparticle‐induced deepening of traps is not sufficient to explain the fact that the space charge accumulation in the nanodielectrics is lower than in the pristine polymers . Hoang et al also used the bipolar charge transport model to model the charge transport in nanodielectrics, and they showed that the reduced charge current in the nanocomposite was due partly to an increase in the injection barrier at the electrode–insulator interface. The reduced charge current in the nanocomposite was also claimed to be due to a reduction in the effective charge mobility and an increase in trap depth and density.…”

Section: Charge Transport Mechanisms In Nanocomposite‐based Insulatiomentioning

confidence: 99%

“…) and/or detrapping energy barrier and deep trap density (in ref. ), are considered being the same for electrons and holes. The nature of the “macroscopic” interface between two samples of different or the same material also has a strong influence on the accumulation of space charges and overall charge carrier mobility.…”

Section: Charge Transport Mechanisms In Nanocomposite‐based Insulatiomentioning

confidence: 99%

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The Role of Interfaces in Polyethylene/Metal‐Oxide Nanocomposites for Ultrahigh‐Voltage Insulating Materials

2017

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Recent progress in the development of polyethylene/metal-oxide nanocomposites for extruded high-voltage direct-current (HVDC) cables with ultrahigh electric insulation properties is presented. This is a promising technology with the potential of raising the upper voltage limit in today's underground/submarine cables, based on pristine polyethylene, to levels where the loss of energy during electric power transmission becomes low enough to ensure intercontinental electric power transmission. The development of HVDC insulating materials together with the impact of the interface between the particles and the polymer on the nanocomposites electric properties are shown. Important parameters from the atomic to the microlevel, such as interfacial chemistry, interfacial area, and degree of particle dispersion/aggregation, are discussed. This work is placed in perspective with important work by others, and suggested mechanisms for improved insulation using nanoparticles, such as increased charge trap density, adsorption of impurities/ions, and induced particle dipole moments are considered. The effects of the nanoparticles and of their interfacial structures on the mechanical properties and the implications of cavitation on the electric properties are also discussed. Although the main interest in improving the properties of insulating polymers has been on the use of nanoparticles, leading to nanodielectrics, it is pointed out here that larger microscopic hierarchical metal-oxide particles with high surface porosity also impart good insulation properties. The impact of the type of particle and its inherent properties (purity and conductivity) on the nanocomposite dielectric and insulating properties are also discussed based on data obtained by a newly developed technique to directly observe the charge distribution on a nanometer scale in the nanocomposite.

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“…The injected bipolar charges drifted and diffused through the layered films and then were trapped/detrapped and recombined under the action of electric fields. The time-space dependent equations describing the charge dynamics are as follows [26,27]:…”

Section: Charge Generation and Transportmentioning

confidence: 99%

Physicochemical Characteristics and Dynamic Charge Mapping in Thermally Aged Two-Layered Polymer Considering Surface States: Experiment and Simulation

et al. 2020

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Under operational conditions of high electric fields and elevated temperatures, the accumulation of space charges at multilayer insulation interfaces is often considered as an important factor affecting insulation performance. This study experimentally explored the influence of different thermal aging degrees (110 °C for 0, 720, 1600, 2100, and 2900 h) on physicochemical characteristics. The space charge dynamics in two-layered thermally aged PET-PET films were measured using the pulsed electro-acoustic (PEA) method and simulated on the basis of a one-dimensional modified bipolar charge transport model. The parameterization for key parameters involved in the model was analyzed through parameter sensitivity. Results indicated that the molecular structure, crystallinity, and dielectric spectra of the PET films are affected by thermal aging. The thermalization process also has noticeable effect on the surface state characteristics, which are characterized by deeper trap depth and larger trap density. Several experimental phenomena measured by the PEA method were observed on the basis of numerical simulation.

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Charge Transport in LDPE Nanocomposites Part II—Computational Approach

Cited by 49 publications

References 30 publications

Maxwell–Wagner Effect in Multi-Layered Dielectrics: Interfacial Charge Measurement and Modelling

Maxwell–Wagner Effect in Multi-Layered Dielectrics: Interfacial Charge Measurement and Modelling

The Role of Interfaces in Polyethylene/Metal‐Oxide Nanocomposites for Ultrahigh‐Voltage Insulating Materials

Physicochemical Characteristics and Dynamic Charge Mapping in Thermally Aged Two-Layered Polymer Considering Surface States: Experiment and Simulation

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