IET Nanodielectrics最新文献

{"title":"Improvement of the flashover threshold of TUK pressboard by using FeO3-based nanofluid of monoesters","authors":"Jean Lambert Jiosseu,&nbsp;Ghislain Mengata Mengounou,&nbsp;Emeric Tchamdjio Nkouetcha,&nbsp;Adolphe Moukengue Imano","doi":"10.1049/nde2.12070","DOIUrl":"10.1049/nde2.12070","url":null,"abstract":"<p>This article deals with the improvement of the dielectric properties of TUK cellulose paper by impregnation. The experiment was carried out using a nanofluid based on vegetable oil esters and iron nanoparticles (FeO₃). The insulating liquids used are palm kernel oil methyl ester (PKOME) and castor oil methyl ester (COME). The evaluation of the improvement is based on the analysis of the flashover voltage of the creeping discharges produced on the immersed paper. The tests were carried out under a positive lightning impulse voltage and for two electrode configurations. The concentrations of nanoparticles used in the experiment are 0.10 wt.%, 0.15 wt.% and 0.20 wt.%. The experimental results show that the 0.10 wt.% concentration gives the best improvement for the two electrode configurations used. The improvements are 53% for the inclined tip and 56.90% for the vertical tip in the case of COME + FeO₃. For PKOME + FeO₃, the results are 59.90% and 64.60%, respectively, for the two configurations.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"7 2","pages":"78-87"},"PeriodicalIF":2.7,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12070","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136347694","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}

{"title":"Improved dielectric and energy storage properties of three-dimensional BaTiO3/polyvinyl alcohol-boron nitride flexible dielectric composite via template infiltration strategy","authors":"Yongzhi Yang,&nbsp;Jinxiang Chao,&nbsp;Peng Jiang,&nbsp;Runhan Xu,&nbsp;Yuchao Li,&nbsp;Yanhu Zhan,&nbsp;Zhicheng Shi,&nbsp;Chengzhu Liao","doi":"10.1049/nde2.12067","DOIUrl":"10.1049/nde2.12067","url":null,"abstract":"<p>Continuous three-dimensional BaTiO₃ (3DBT) ceramic network was prepared by the sol-gel method using cleanroom wipers as the template. Subsequently, flexible 3DBT/polyvinyl alcohol-boron nitride nanosheets (PVA-BNNS) composite dielectric films were facilely fabricated by inversely introducing different BNNS concentrations of PVA-BNNS solution into the 3DBT network. The results demonstrated that PVA solution effectively embedded into the 3DBT framework through an inverse infiltration process, thereby endowing the material with excellent flexibility. The content of 3DBT in the saturated 3DBT/PVA-BNNS composite was ∼27 wt% (6.9 vol%). In addition, the 3DBT/PVA-1.0%BNNS system exhibited an excellent dielectric constant of 17.4 (at 1 kHz), a high breakdown strength of 114.5 kV·mm⁻¹ and an energy density of 2.51 J·cm⁻³ (at 110 kV·mm⁻¹), being 1.67, 1.58 and 7.17 times higher than those of traditional fabricated 27 wt% nano-BT/PVA (at 70 kV·mm⁻¹) composite, respectively. What's more, the obtained 3DBT/PVA-BNNS dielectric film exhibited superior thermal and mechanical stability, indicating potential applications in harsh environments.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"7 2","pages":"68-77"},"PeriodicalIF":2.7,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12067","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135373078","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}

{"title":"Mechanism of positive electret inhibition of Staphylococcus aureus biofilms","authors":"Hongbao Wang,&nbsp;Hejuan Liang,&nbsp;Xin Guo,&nbsp;Jiajie Xu,&nbsp;Jian Jiang,&nbsp;Zhipeng Sun,&nbsp;Yuanyuan Liang","doi":"10.1049/nde2.12065","DOIUrl":"10.1049/nde2.12065","url":null,"abstract":"<p>Bacterial biofilm is an important factor in bacterial drug resistance. Recently, it has been proved that electret films can inhibit the bacterial biofilm, while its mechanism of action on biofilms is under further investigation. In this work, taking <i>Staphylococcus aureus</i> as an example, the inhibition of positive electret on bacterial biofilm was verified and its mechanism was explained. Two factors have been found to explain the inhibition mechanism of electret on bacterial biofilms. One is probably due to its inhibition of the expression of key genes related to bacterial biofilms induced by the electric field of positive electret, and the other is to prevent the aggregation of bacteria rather than the direct bactericidal effect. The conclusions are expected to be extended to other types of bacteria and expand the application of electrostatic materials in the field of biomedicine.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 4","pages":"282-289"},"PeriodicalIF":2.7,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12065","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135928032","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}

{"title":"Polyetherimide nanocomposites filled with in-situ synthesised bismaleimide-DDE@CCTO hybrid nanofibers enabling improved dielectric and interfacial performance","authors":"Peiyuan Zuo,&nbsp;Bowen Sun,&nbsp;Donglin Chen,&nbsp;Lianping Yuan,&nbsp;Yi Chen,&nbsp;Jingyu Lin,&nbsp;Qixin Zhuang","doi":"10.1049/nde2.12066","DOIUrl":"10.1049/nde2.12066","url":null,"abstract":"Most current research of nanocomposite dielectrics for modern electronic devices and electric equipment usually focuses more on dielectric properties while in some extent ignoring the interfacial adhesion characteristics. However, the poor interfacial adhesion frequently results in serious dielectric field distortion, which would in return impair the dielectric performance enhancement. As such, how to simultaneously achieve the excellent dielectric properties and interfacial adhesion performance in organic‐inorganic nanocomposite system is worth in‐depth investigation. To realise this aim, novel hybrid nanofibers are neatly fabricated using in situ copolymerisation reaction of bismaleimide and diamino‐diphenyl ether monomers on the CCTO nanofiller surface via covalent bond connections. The resulting nanocomposites achieve high dielectric constant (9.3) and low dielectric loss (0.0185) at 1 kHz. The BMI‐DDE@CCTO/PEI yields a high discharge energy density (3.09 J/cm3) at moderate electric field (200 MV/m). Noticeably, the nanocomposites enable stable dielectric performance over a wide temperature range from room temperature to 150°C. Moreover, the binding energy for BMI‐DDE and PEI is 1052 kJ/mol according to DFT calculation. As such, the authors speculate this interesting study would inspire the broad researchers devoting to investigating bismaleimide‐coated high‐aspect‐ratio nanofillers and their dielectric materials for collaboratively improved dielectric and interfacial performance.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 4","pages":"246-256"},"PeriodicalIF":2.7,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12066","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136069130","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}

{"title":"Guest Editorial: High-performance polyimide dielectric materials","authors":"Jun-Wei Zha,&nbsp;Lei Zhai","doi":"10.1049/nde2.12063","DOIUrl":"https://doi.org/10.1049/nde2.12063","url":null,"abstract":"&lt;p&gt;Polyimides are advanced polymeric materials that are well known for their excellent thermal, mechanical, electrical and chemical resistance properties. As an important kind of high-temperature resistant dielectric material, polyimides have been widely used in various applications such as electronics, microelectronics and electrical fields, due to their high thermal stability, high glass transition temperature (&lt;i&gt;T&lt;/i&gt;&lt;sub&gt;&lt;i&gt;g&lt;/i&gt;&lt;/sub&gt;), outstanding dielectric and electrical insulating performance at the high electric field or at high frequencies. Polyimide dielectric materials have a rich variety of reactive monomers, which endows the molecular structures with strong designability and facilitates the regulation of material properties. Moreover, polyimides can be compounded with various functional fillers to achieve the multifunctional dielectric materials with low or high dielectric properties, low dielectric loss and high breakdown strength. Polyimide dielectric materials also have an ease of processability that make them patternable for many types of integrated devices. With the ongoing advancements in a wide range of novel electronic, microelectronic and new energy applications, polyimide dielectric materials have gained increasing interest from both fundamental and applied research. High-performance polyimide dielectric materials are essential for the development of new electronic or electrical devices where further considerations are required, including higher temperature resistance and energy storage, lower dielectric constant and dielectric loss, improved thermal conduction management as well as better reliability or flexibility in harsh environments. In order to meet the more stringent application requirements mentioned above, there is an urgent need to develop polyimide dielectric materials with higher comprehensive performance, which requires joint development through new theoretical designs, new structures, methods, processes and other means. A wide variety of research is being conducted to prepare kinds of functional polyimide dielectric materials to address applicable challenges and explore possible opportunities in different fields. This current Special Issue is focused on ‘&lt;b&gt;&lt;i&gt;High performance polyimide dielectric materials&lt;/i&gt;&lt;/b&gt;’ and their applications in different topics, emphasising the latest innovations in polyimide or polyimide-based dielectric materials and better understanding of deep relationship between their chemical or composition structures and overall performances.&lt;/p&gt;&lt;p&gt;In this Special Issue, four high-quality papers have undergone peer-reviewed and eventually been accepted for publication. These published papers include five original research papers and one review article in the application field of high-performance polyimide dielectric materials. All the papers can be clustered into three main categories related to dielectric materials, namely preparation, molecular design and measurement or simulation. (","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 3","pages":"73-75"},"PeriodicalIF":2.7,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12063","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50134673","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}

{"title":"Significant enhancement of dielectric properties in polyimides with sulfonyl groups in the side chains","authors":"Jinpeng Luo,&nbsp;Hui Tong,&nbsp;Shimo Cao,&nbsp;Junbiao Liu,&nbsp;Xiaomin Li","doi":"10.1049/nde2.12062","DOIUrl":"10.1049/nde2.12062","url":null,"abstract":"<p>Polymer dielectrics with excellent thermal resistance and superior energy storage behaviour are extensively demanded with the increasing development of film capacitors applied in hostile environments. In this study, novel diamine with sulfonyl-containing side chain was designed and synthesised. The corresponding polyimide (PI) dielectrics derived from the sulfonyl-containing diamine were prepared, so were the polyimides possessing the same backbone but without side chains. Consequently, superior thermal resistance of glass transition temperature ranged from 162–208°C was obtained. Moreover, the polyimides presented permittivity of 3.34–5.89 at 1 kHz, Weibull breakdown strength of 377–538 MV/m and discharged energy density of 3.82–5.85 J/cm³. In particular, sulfonyl-containing polyimide of SPI-2 with flexible backbone and sulfonyl side chain indicates the highest discharged energy density and charge-discharge efficiency simultaneously. The introduction of the strong polar sulfonyl group in the side chain enhances dielectric and energy storage properties effectively. In addition, it is found that the dipolar moment density (μ/<i>V</i>_vdw) calculated from molecular simulation is closely correlated to permittivity measured from experiments. The combined method of molecular simulation and experiments would offer an effective approach to assist in molecular design of high-performance polymer dielectrics.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 3","pages":"105-115"},"PeriodicalIF":2.7,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12062","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45734393","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}

{"title":"An electrostatic micromotor based on electrets","authors":"Gangjin Chen,&nbsp;Jianfeng Zhang,&nbsp;Zhankui Fan,&nbsp;Xiaoli Gao,&nbsp;Yanming Ye","doi":"10.1049/nde2.12059","DOIUrl":"10.1049/nde2.12059","url":null,"abstract":"<p>The authors report a novel electret-based miniature electrostatic motor with an electret film as the stator and a metal electrode as the rotor. A particular commutator is used to transform the polarity of the metal electrode. When the size of the electret-based electrostatic motor (EEM) is 42 × 44 × 15 mm³, the maximum power consumption is only 5.4 mW. The rotation speed of the EEM increases with the increase of the supply voltage, and the maximum rotation speed can reach up to 2864 rpm. Powered by two nickel-hydride batteries with a rated capacity of 1700 mAh, the EEM can drive a fan with a diameter of 40 mm to rotate continuously for 18 h. The EEM has the characteristics of low power consumption and convenient fabrication. Experimental results show that the EEM demonstrates high reliability and has potential applications in micro-electromechanical systems.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 4","pages":"276-281"},"PeriodicalIF":2.7,"publicationDate":"2023-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12059","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48980075","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}

{"title":"Dielectric, piezoelectric, and ferroelectric nanomaterials in the biomedical applications","authors":"Fang Wang,&nbsp;Jun-Yu Huang,&nbsp;Hao Zhang,&nbsp;Qun-Dong Shen","doi":"10.1049/nde2.12061","DOIUrl":"10.1049/nde2.12061","url":null,"abstract":"<p>We have witnessed the flourish of bioelectronics, brain–computer interface, and brain science programme in recent decades. In this review, the up-to-date advances of dielectric, piezoelectric, and ferroelectric nanomaterials in the biomedical applications are summarised. Biomolecular detection methods have been developed, including dielectric-gated field-effect transistor, dielectrophoresis, non-linear dielectric response, and optical tweezer. Endogenous bioelectricity is a crucial in cell proliferation, migration, differentiation, intracellular communication, neuronal activity, tissue growth. Piezoelectric and ferroelectric materials can be utilised as energy transducer to monitor physiological signal, such as blood pressure or respiration, and directly stimulate cell differentiation, neuronal regeneration, tissue repairment etc. They can also catalyse the electrochemical reaction of organisms through piezoelectricity. The intrinsic relevance between neuronal and ferroelectric polarisation signals inspires the application of the ferroelectrics in the modern intelligent bioelectronics like the artificial retina.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 4","pages":"212-230"},"PeriodicalIF":2.7,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12061","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45682798","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}

{"title":"Surface-coated polymer nanocomposites containing z-aligned high-k nanowires as high-performance dielectrics at elevated temperatures","authors":"Sang Cheng,&nbsp;Mingcong Yang,&nbsp;Jing Fu,&nbsp;Rui Wang,&nbsp;Jinliang He,&nbsp;Qi Li","doi":"10.1049/nde2.12060","DOIUrl":"10.1049/nde2.12060","url":null,"abstract":"<p>Recently, demands for high-performance polymer film capacitors at elevated temperatures have become more urgent. High dielectric constant is essential for dielectric materials to achieve substantial energy density at relatively low electric fields, which is of great significance to practical applications, while improving the permittivity of high-temperature polymer dielectrics without a remarkable deterioration in other electrical properties still remains a challenge. Here, a polymer nanocomposite containing z-aligned high-k nanowires sandwiched by e-beam evaporation deposited Al₂O₃ films was developed based on the optimal structure proposed by the phase-field simulation. It is found that z-aligned nanowires are more effective in promoting the dielectric constant than random-aligned ones, and a large increase in dielectric constant is observed at relatively low content of nanofillers. Outer insulating layers effectively suppress the electric conduction and improve the breakdown strength. Consequently, the nanocomposite with only 1 volume fraction of z-aligned nanowires exhibits a breakdown strength, electrical resistance, and charge–discharge efficiency as high as neat PEI, but more than twice the discharged energy density than it at 150 °C. This study realises the optimal structure predicted by simulation in experiment, obtaining high-permittivity, high-temperature nanocomposites at no expense of other electrical properties, and making it possible to achieve high discharged energy density at relatively low electric fields.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 4","pages":"237-245"},"PeriodicalIF":2.7,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12060","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49122766","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}

{"title":"Multi-modified epoxy insulation with improved flashover threshold for HVDC applications","authors":"Inzamam Ul Haq,&nbsp;Feipeng Wang","doi":"10.1049/nde2.12058","DOIUrl":"10.1049/nde2.12058","url":null,"abstract":"<p>The flashover threshold (<i>V</i>_<i>flsh</i>) of polymer insulations such as epoxy (EP) in HVDC systems can be augmented by modifying their surface with an appropriate treatment technology. For such purpose, several surface treatment methods such as ion beam, sandpaper and a combination of the two is introduced. Firstly, insulation samples with pure epoxy (<i>EP</i>_<i>pure</i>), different ion beam treatment periods (<i>EP</i>_<i>ion</i>;10, 15, 20 min) and different roughness (<i>EP</i>_<i>sand</i>; <i>R</i>1 = 4.23 μm, <i>R</i>2 = 6.34 μm, <i>R</i>3 = 9.21 μm) are prepared on the laboratory scale. Afterward, based on several characterisations, such as surface conductivity, mean surface roughness and potential distribution of these insulations, multi-modified insulation (<i>EP</i>_<i>multi</i> = <i>EP</i>_{<i>ion-20</i>} + <i>EP</i>_{<i>sand-R3</i>}) is prepared. In the end, the <i>V</i>_<i>flsh</i> of each insulation group is measured and compared to examine the effectiveness of the proposed modifications. It is obtained that the <i>V</i>_<i>flsh</i> of the modified insulations augmented dramatically irrespective of the treatment method. The <i>V</i>_<i>flsh</i> of the insulation group <i>EP</i>_<i>multi</i> augmented by 52.66 % which is the highest improvement among all insulation groups. In short, the proposed surface modifications are effective and could be used as references to enhance the insulation strength of polymer dielectrics in HVDC systems.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 4","pages":"267-275"},"PeriodicalIF":2.7,"publicationDate":"2023-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12058","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48288830","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}