Influence of nanoparticle surface coating on electrical conductivity of LDPE/Al&lt;inf&gt;2&lt;/inf&gt;O&lt;inf&gt;3&lt;/inf&gt; nanocomposites for HVDC cable insulations

Liu, Dongming; Hoang, Anh T.; Pourrahimi, Amir Masoud; Pallon, Love K. H.; Nilsson, Fritjof; Gubanski, Stanislaw; Olsson, Richard T.; Hedenqvist, Mikael S.; Gedde, Ulf W.

doi:10.1109/tdei.2017.006310

Cited by 49 publications

(35 citation statements)

References 32 publications

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“…This behavior was suggested to be related to the presence of adsorbed water in frequently appearing large agglomerates of unmodified MgO nanoparticles, which provided a conduction path through the agglomerates and a local increase in conductivity . The role of the nanoparticle surface activity and interparticle distance were essentially the same with Al 2 O 3 . Figure f shows the DC conductivity of LDPE nanocomposites based on unmodified and C8‐surface‐modified Al 2 O 3 nanoparticles with an average size of 50 nm, plotted against the nanoparticle content under a constant applied electric field.…”

Section: Polyethylene Nanocomposites For High Voltage Insulationmentioning

confidence: 95%

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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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Section: Polyethylene Nanocomposites For High Voltage Insulationmentioning

confidence: 95%

“…f) The DC conductivity plotted as a function of nanoparticle weight percent for LDPE nanocomposites based on unmodified and C8 surface modified 50 nm Al 2 O 3 nanoparticles. Reproduced with permission . Copyright 2017, IEEE.…”

Section: Polyethylene Nanocomposites For High Voltage Insulationmentioning

confidence: 99%

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

2017

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“…Dielectric breakdown is quite related with the mobile charges and conductivity inside the nanocomposites. The use of chemical modifier enables not only enhancement of the compatibility and nanoparticles dispersion, but also improving the local electrical behaviors at interfaces for reduced leakage current and increased breakdown strength by their electronic nature . The chemically bonded molecules on the ceramic nanoparticle surface can influence the electronic states of interfaces, hence regulating the electron trapping, scattering, and even local conductivity .…”

Section: Interfacial Enhancement Effect Of Breakdown Strength and Diementioning

confidence: 99%

Superior Energy Storage Performances of Polymer Nanocomposites via Modification of Filler/Polymer Interfaces

Zhang

Dong

et al. 2018

Adv Materials Inter

178

112

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systems, they have numerous applications in various fields as pulsed power supply technology, [8,9] energy harvesting, [10][11][12] inverters, [13][14][15] and passive elements, [16][17][18] toward both defense and civil industries. Excellent energy storage capabilities of dielectric materials including high discharged energy density and high energy efficiency have long been eagerly pursued to meet the challenges and needs of the rapid development of modern industry, i.e., the low energy density of current dielectric materials results in overburdened capacitor volume and weight in electrical power systems. The energy storage performances of dielectric materials are usually multiply determined by three major electrical and dielectric parameters, which are categorized as:1) The breakdown strength E b ;2) The relative permittivity (also called dielectric constant) ε r or electric displacement D (the electric displacement is related to the polarization P by D = P + ε 0 E, here ε 0 = 8.85 × 10 −12 F m −1 is the vacuum permittivity); 3) The dielectric loss tanδ.In general, as illustrated in Figure 1, the discharged energy density of dielectric materials can be determined aswhere E is the applied electric field, and the energy efficiency is calculated by Dielectric polymer nanocomposites by integration of high-E b polymer matrix and high-D(ε r ) ceramic fillers have shown great potential for dielectric and energy storage applications in modern electronic and electrical systems. Interface between ceramic fillers and polymer matrix is considered as a predominant factor to determine the dielectric performances of the nanocomposites. This review analyzes the influence of the interface on dielectric responses and breakdown strength in the nanocomposites, and discusses the viability of current interface engineering strategies in improving their energy storage capabilities. Two scopes of current interface modification approaches are focused from both structural and functional considerations in the dielectric ceramics/polymer nanocomposites: first, the organic/inorganic interface compatibility can be modified to generate homogeneous dispersion of ceramic nanoparticles in polymer matrix, which is the premise of fully realizing the synergistic combination of advantages of polymer and ceramic fillers; second, regulated local electrical and dielectric behaviors in interface region enable the enhancement of dielectric properties (both high dielectric constant and high breakdown strength) in resultant nanocomposites. In the last part, some present challenges and future perspectives are proposed to utilize the interface strategy for developing high energy density ceramics/ polymer nanocomposites for dielectric and energy storage applications.

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“…As shown in Figure 8(a, b), some researchers put the nanoparticles with high permittivity inside the contact materials to increase the dielectric constant of materials [65,117,118]. Chen et al used the dielectric nanoparticles such as SiO 2 , TiO 2 , BaTiO 3 , SrTiO 3 filling into PDMS matrices to increase the permittivity of contact materials [65].…”

Section: Dielectric Property Engineeringmentioning

confidence: 99%

Modulation of surface physics and chemistry in triboelectric energy harvesting technologies

Lee

Kim

Park

et al. 2019

Science and Technology of Advanced Materials

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Mechanical energy harvesting technology converting mechanical energy wasted in our surroundings to electrical energy has been regarded as one of the critical technologies for self-powered sensor network and Internet of Things (IoT). Although triboelectric energy harvesters based on contact electrification have attracted considerable attention due to their various advantages compared to other technologies, a further improvement of the output performance is still required for practical applications in next-generation IoT devices. In recent years, numerous studies have been carried out to enhance the output power of triboelectric energy harvesters. The previous research approaches for enhancing the triboelectric charges can be classified into three categories: i) materials type, ii) device structure, and iii) surface modification. In this review article, we focus on various mechanisms and methods through the surface modification beyond the limitations of structural parameters and materials, such as surficial texturing/patterning, functionalization, dielectric engineering, surface charge doping and 2D material processing. This perspective study is a cornerstone for establishing next-generation energy applications consisting of triboelectric energy harvesters from portable devices to power industries.

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Influence of nanoparticle surface coating on electrical conductivity of LDPE/Al<inf>2</inf>O<inf>3</inf> nanocomposites for HVDC cable insulations

Cited by 49 publications

References 32 publications

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

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

Superior Energy Storage Performances of Polymer Nanocomposites via Modification of Filler/Polymer Interfaces

Modulation of surface physics and chemistry in triboelectric energy harvesting technologies

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