IET Nanodielectrics最新文献_第10页

Further investigation on solant–rectenna-based flexible Hilbert-shaped metamaterials 基于solant–rectenna的柔性希尔伯特形超材料的进一步研究

IF 2.7

IET Nanodielectrics Pub Date : 2020-06-30 DOI: 10.1049/iet-nde.2020.0013

Taha A. Elwi, Sarah G. Abdulqader

{"title":"Further investigation on solant–rectenna-based flexible Hilbert-shaped metamaterials","authors":"Taha A. Elwi, Sarah G. Abdulqader","doi":"10.1049/iet-nde.2020.0013","DOIUrl":"https://doi.org/10.1049/iet-nde.2020.0013","url":null,"abstract":"<div>\u0000 <p>This study discusses the design of a low-profile metamaterial-based antenna consisting of a 3 × 5 array of Hilbert shaped unit cells organised as a rectangular patch. The antenna is backed by with a partial ground plane loaded with square electromagnetic band gap defects for energy harvesting applications in the context of ultra-wideband self-powered wearable wireless devices. The antenna is mounted on a 28 × 32 mm FR4 substrate, with a thickness of 0.394 mm, a relative permittivity of 4.2 and a loss tangent of 0.02. The antenna is also printed on a flexible solar panel for self-powered devices through solant–rectenna output terminals. The proposed solant–rectenna is found to cover the frequency range from 0.8 up to 10 GHz. The <i>I</i>–<i>V</i> characteristics of the solar panel are measured with and without the antenna structure to realize low shadowing effects. After that, the solant radiofrequency (RF) port is connected to a rectifier circuit to create a rectenna port that collects the RF energy and converts it to an output DC voltage at 0.915 GHz. It is found that the proposed rectenna provides an output DC voltage of 1.42 V with a conversion efficiency of 90%.</p>\u0000 </div>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"3 3","pages":"88-93"},"PeriodicalIF":2.7,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1049/iet-nde.2020.0013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72169580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Effect of polyethylene glycol on BaTiO3 nanoparticles prepared by hydrothermal preparation 聚乙二醇对水热法制备BaTiO3纳米粒子的影响

IF 2.7

IET Nanodielectrics Pub Date : 2020-06-18 DOI: 10.1049/iet-nde.2020.0007

Yanfen Peng, Huiling Chen, Feng Shi, Jing Wang

引用次数: 5

Dielectric characterisation of epoxy nanocomposite with barium titanate fillers 钛酸钡填充环氧纳米复合材料的介电特性

IF 2.7

IET Nanodielectrics Pub Date : 2020-05-18 DOI: 10.1049/iet-nde.2019.0037

Romana Zafar, Nandini Gupta

{"title":"Dielectric characterisation of epoxy nanocomposite with barium titanate fillers","authors":"Romana Zafar, Nandini Gupta","doi":"10.1049/iet-nde.2019.0037","DOIUrl":"10.1049/iet-nde.2019.0037","url":null,"abstract":"<div>\u0000 <p>High permittivity materials are currently in use for mitigation of electrical stress in high-voltage apparatus and energy storage systems. In this work, epoxy-based high permittivity nanocomposites with Barium titanate (BaTiO<sub>3</sub>) nanofillers are considered, for the purpose of stress mitigation. Uniform dispersion of the fillers in the polymer up to 10% by volume is achieved. Apart from the use of as-received fillers, the effect of using surface-functionalised nanoparticles (with 3-glycidoxypropyltrimethoxy-silane) before use is also investigated. The nanocomposite is characterised in terms of its complex permittivity, DC conductivity, short-term AC breakdown strength and space charge accumulation, to gauge its suitability for use in high-voltage insulation. Complex permittivity is measured using broadband dielectric spectroscopy over a broad frequency range of 1 mHz to 1 MHz. DC conductivity is studied from polarisation–depolarisation current measurements. Short-term AC breakdown strength tests are performed at power frequency (50 Hz). Space charge density along the sample thickness is obtained using pulsed electro-acoustic technique. A computational case-study is presented to show the feasibility of using the high permittivity nanocomposite for electric stress control in high-voltage equipment (viz., at mounting flanges of 69 kV bushings).</p>\u0000 </div>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"3 2","pages":"53-61"},"PeriodicalIF":2.7,"publicationDate":"2020-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/iet-nde.2019.0037","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49131979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Review on natural ester and nanofluids as an environmental friendly alternative to transformer mineral oil 天然酯和纳米流体作为环境友好型变压器矿物油替代品的研究进展

IF 2.7

IET Nanodielectrics Pub Date : 2020-05-15 DOI: 10.1049/iet-nde.2019.0038

Joyce Jacob, P. Preetha, Sindhu Thiruthi Krishnan

{"title":"Review on natural ester and nanofluids as an environmental friendly alternative to transformer mineral oil","authors":"Joyce Jacob, P. Preetha, Sindhu Thiruthi Krishnan","doi":"10.1049/iet-nde.2019.0038","DOIUrl":"10.1049/iet-nde.2019.0038","url":null,"abstract":"<div>\u0000 <p>The development of reliable, environmentally safe and economic insulating oil for the transformer is an endless effort of the electrical industry. Recent research is based on natural ester fluid, the green insulating oil which exhibits excellent dielectric performance and environment friendly characteristics. Nanofluids are also emerging as potential replacement for the conventional mineral oil used in transformers. Characterisation of nanoparticle filled mineral oil and natural esters have validated their improved dielectric behaviour in comparison to the unfilled oil. Although the applications are wide, the state of the art technology requires a deeper understanding of the underlying phenomenon. Much work is expected to be done in the application of nanofluids prepared with mineral oil and natural ester, particularly its effect on the cellulose insulation. The study provides an overview of the different materials that have been used as alternatives to the conventional transformer mineral oil, with special emphasis on natural esters and natural ester nanofluids, their advantages and challenges.</p>\u0000 </div>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"3 2","pages":"33-43"},"PeriodicalIF":2.7,"publicationDate":"2020-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/iet-nde.2019.0038","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46070324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 30

Influence of xylene on the dielectric response of an organoclay-containing nanocomposite 二甲苯对含有机粘土纳米复合材料介电响应的影响

IF 2.7

IET Nanodielectrics Pub Date : 2020-05-13 DOI: 10.1049/iet-nde.2019.0009

Allison V. Shaw, Alun S. Vaughan, Thomas Andritsch

{"title":"Influence of xylene on the dielectric response of an organoclay-containing nanocomposite","authors":"Allison V. Shaw, Alun S. Vaughan, Thomas Andritsch","doi":"10.1049/iet-nde.2019.0009","DOIUrl":"10.1049/iet-nde.2019.0009","url":null,"abstract":"<div>\u0000 <p>The dielectric effect, investigated using dielectric spectroscopy and DC dielectric breakdown strength measurements, of introducing xylene into a composite system containing polyethylene, a co-polymer of ethylene and vinyl acetate and an organoclay can be understood in light of X-ray diffraction data. In dielectric spectroscopy, although organoclay alone changes the dielectric response of the polymer blend and xylene has no effect on the unfilled polymer blend, when both xylene and organoclay are present, a synergistic response is revealed at the 1 V<sub>rms</sub> amplitude voltage used to acquire the dielectric data. In contrast to this, in DC, dielectric breakdown strength measurements revealed that, under high field conditions, both the xylene and organoclay, independently, caused a decreased breakdown strength. This work was undertaken in order to examine the generality of the possible effects of labile, low molar mass impurities on electrical properties of comparable systems, which may be processed through solvent-based routes.</p>\u0000 </div>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"3 2","pages":"62-67"},"PeriodicalIF":2.7,"publicationDate":"2020-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/iet-nde.2019.0009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41544142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Analysis of space charge and charge trap characteristics of gamma irradiated silicone rubber nanocomposites 辐照硅橡胶纳米复合材料空间电荷和电荷阱特性分析

IF 2.7

IET Nanodielectrics Pub Date : 2020-04-20 DOI: 10.1049/iet-nde.2019.0041

Baskar Thangabalan, Ramanujam Sarathi, Noureddine Harid, Huw Griffiths

引用次数: 5

Dielectric spectroscopy of epoxy-based barium titanate nanocomposites: effect of temperature and humidity 环氧基钛酸钡纳米复合材料的介电光谱：温度和湿度的影响

IF 2.7

IET Nanodielectrics Pub Date : 2020-02-28 DOI: 10.1049/iet-nde.2019.0036

Romana Zafar, Nandini Gupta

{"title":"Dielectric spectroscopy of epoxy-based barium titanate nanocomposites: effect of temperature and humidity","authors":"Romana Zafar, Nandini Gupta","doi":"10.1049/iet-nde.2019.0036","DOIUrl":"10.1049/iet-nde.2019.0036","url":null,"abstract":"<div>\u0000 <p>The information contained in the dielectric response of materials is useful to study the charge transport behaviour of dielectric materials at the molecular level. Therefore, in this work, broadband dielectric spectroscopy is used to measure complex permittivity of epoxy resin and its nanocomposites over a wide frequency range of 10<sup>−3</sup> –10<sup>+6</sup> Hz. Measurements are carried out at different temperatures (25–90°C) and relative humidities of 50% RH and 90% RH. Nanocomposites are prepared with as-received and surface-functionalised barium titanate (BaTiO<sub>3</sub>) nanofillers incorporated into epoxy. Filler loading of 1–10% by volume are achieved and investigated. A detailed study of the effect of filler loading and surface functionalisation of particles before incorporation into the nanocomposite is included. It is seen that the addition of nanofillers increases both real and imaginary relative permittivity of the composite. Experiments are carried out to understand the effect of water content on epoxy and its nanocomposites. It reveals that low-frequency dispersion or quasi-DC conduction is exhibited at high humidity (90% RH) and high temperature (90°C).</p>\u0000 </div>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"3 1","pages":"20-27"},"PeriodicalIF":2.7,"publicationDate":"2020-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1049/iet-nde.2019.0036","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49551572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Barium titanate/polydimethylsiloxane nano/microcomposites fabrication, morphology, dielectric response and functionality 钛酸钡/聚二甲基硅氧烷纳米/微复合材料的制备、形态、介电响应和功能

IF 2.7

IET Nanodielectrics Pub Date : 2020-02-25 DOI: 10.1049/iet-nde.2019.0043

Anastasios C. Patsidis

{"title":"Barium titanate/polydimethylsiloxane nano/microcomposites fabrication, morphology, dielectric response and functionality","authors":"Anastasios C. Patsidis","doi":"10.1049/iet-nde.2019.0043","DOIUrl":"10.1049/iet-nde.2019.0043","url":null,"abstract":"<div>\u0000 <p>Polymer matrix composites with embedded ferroelectric and/or piezoelectric particles, constitute a novel and interesting class of engineering materials. The incorporation of ferroelectric and/or piezoelectric particles within a polymer matrix is expected to add functionality to the resulting composite, due to the variation of polarisation of the ceramic particles with temperature. In this work, an elastomeric matrix such as polydimethylsiloxane and BaTiO<sub>3</sub> nano and microparticles were used for the fabrication of composites at various concentrations and sizes of the reinforcing phase. Morphological and structural characteristics were investigated via scanning electron microscopy images and X-ray diffraction patterns. The dielectric behaviour of all fabricated specimens was investigated via broadband dielectric spectroscopy, in a wide frequency (10<sup>−1</sup> Hz–10 MHz) and temperature (30–200°C) range. In the dielectric spectra, two relaxation processes were detected, namely cold crystallisation and interfacial polarisation. Values of dielectric permittivity enhance with filler content, and particles’ size, while diminishes significantly with frequency. Finally, the ability of the prepared systems to store energy was examined by calculating their energy density. The higher energy-storing efficiency is exhibited by the micro-BaTiO<sub>3</sub> reinforced composites, while functional behaviour is induced via the thermally activated structural changes of ferroelectric particles.</p>\u0000 </div>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"3 1","pages":"14-19"},"PeriodicalIF":2.7,"publicationDate":"2020-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/iet-nde.2019.0043","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47737605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Deep trap sites suppressing space charge injection in polycyclic aromatic compounds doped XLPE composite 多环芳烃掺杂交联聚乙烯复合材料中深陷阱位抑制空间电荷注入

IF 2.7

IET Nanodielectrics Pub Date : 2020-02-12 DOI: 10.1049/iet-nde.2019.0035

Jin Li, Chenlei Han, Boxue Du, Tatsuo Takada

引用次数: 10

Differentiation of roughness and surface defect impact on dielectric strength of polymeric thin films 粗糙度和表面缺陷的差异对聚合物薄膜介电强度的影响

IF 2.7

IET Nanodielectrics Pub Date : 2020-02-10 DOI: 10.1049/iet-nde.2019.0031

Daniel Qi Tan

引用次数: 19