IET Nanodielectrics最新文献_第5页

Electric field distribution around asymmetric agglomerate model reconstructed from FIB–SEM images of epoxy nanocomposite 利用FIB-SEM图像重建环氧纳米复合材料不对称团聚体模型的电场分布

IF 2.7

IET Nanodielectrics Pub Date : 2023-01-12 DOI: 10.1049/nde2.12042

Kazuma Tagawa, Muneaki Kurimoto, Toru Sawada, Shigeyoshi Yoshida, Takahiro Umemoto, Hirotaka Muto

{"title":"Electric field distribution around asymmetric agglomerate model reconstructed from FIB–SEM images of epoxy nanocomposite","authors":"Kazuma Tagawa, Muneaki Kurimoto, Toru Sawada, Shigeyoshi Yoshida, Takahiro Umemoto, Hirotaka Muto","doi":"10.1049/nde2.12042","DOIUrl":"10.1049/nde2.12042","url":null,"abstract":"This study focussed on determining the electric field distribution formed by asymmetric agglomerates in order to elucidate the mechanism by which large agglomerates reduce the dielectric breakdown strength of nanocomposites. Epoxy nanocomposite sample was prepared by adding 2.5 vol% of TiO2 nanoparticles with a primary particle size ranging from 30 to 50 nm. The three-dimensional (3D) structure of the epoxy nanocomposites with a thickness of 5 μm was analysed via focussed ion beam and scanning electron microscopy. The 3D reconstruction was performed using 250 observation images, and a 3D model of the particle in the observational range was obtained. The electric field distribution for the 3D model of the agglomerate with the largest size was determined using the finite element method. In addition, we constructed a calculation model that effectively accommodate changes in the direction of the applied electric field. Subsequently, we examined the changes in the maximum electric field intensity around the agglomerate.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 1","pages":"9-18"},"PeriodicalIF":2.7,"publicationDate":"2023-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12042","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46659268","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: 0

Resilient electret film-based vibrational energy harvesters with a V-shaped counter electrode 具有V形反电极的弹性驻极体膜振动能量收集器

IF 2.7

IET Nanodielectrics Pub Date : 2023-01-11 DOI: 10.1049/nde2.12040

Xiaoya Yang, Xingchen Ma, Chuan Ding, Gerhard M. Sessler, Heinz von Seggern, Mario Kupnik, Ying Dai, Pengfei He, Xiaoqing Zhang

{"title":"Resilient electret film-based vibrational energy harvesters with a V-shaped counter electrode","authors":"Xiaoya Yang, Xingchen Ma, Chuan Ding, Gerhard M. Sessler, Heinz von Seggern, Mario Kupnik, Ying Dai, Pengfei He, Xiaoqing Zhang","doi":"10.1049/nde2.12040","DOIUrl":"10.1049/nde2.12040","url":null,"abstract":"Vibrational energy harvesters, which can convert mechanical energy distributed widely in the surrounding environment to electrical energy in a convenient, eco-friendly and sustainable way, have attracted great attention in both academia and industry. In this study, a resilient electret film-based vibrational energy harvester with a V-shaped counter electrode is introduced, simulated and constructed. A negatively charged fluorinated polyethylene propylene (FEP) electret film with a wavy shape was adopted in the devices, achieving simultaneously a stable embedded biased voltage and a large tensile deformation during vibration. The influences of the factors on the performance of the device, including the initial stretching state of the resilient electret film, seismic mass and depth of the V-shape counter electrode, were analyzed comprehensively with finite element simulation and compared to experiments. Further, the structure of the device was optimised for generating a high output power, and a good agreement between the simulation and experimental data was achieved. Additionally, the resonant frequency of the device can be easily tuned between 28 and 68 Hz by merely adjusting the initial stretching state of the wavy FEP electret film, guaranteeing great superiority for broad bandwidth energy harvesting applications. For an optimised energy harvester with a volume of only 15 × 5 × 1.7 mm3 and a tiny seismic mass of 25 mg, and a normalized output power referring to 1 × g (g is the gravity of the Earth) up to 547 μW was obtained at its resonant frequency of 28 Hz. These results demonstrate that such a miniaturised vibrational energy harvester is a promising electrical energy supplier for low-power-consumption electronic devices, in particular in wireless sensor networks.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 2","pages":"36-45"},"PeriodicalIF":2.7,"publicationDate":"2023-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12040","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43269199","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: 0

Rigid/flexible molecular structure-induced polyimide aerogels with ultralow permittivity and thermal insulation properties 具有超低介电常数和隔热性能的刚性/柔性分子结构诱导聚酰亚胺气凝胶

IF 2.7

IET Nanodielectrics Pub Date : 2022-12-19 DOI: 10.1049/nde2.12041

Xiaodi Dong, Baoquan Wan, Lin Qiu, Ming-Sheng Zheng, Jiefeng Gao, Jun-Wei Zha

{"title":"Rigid/flexible molecular structure-induced polyimide aerogels with ultralow permittivity and thermal insulation properties","authors":"Xiaodi Dong, Baoquan Wan, Lin Qiu, Ming-Sheng Zheng, Jiefeng Gao, Jun-Wei Zha","doi":"10.1049/nde2.12041","DOIUrl":"10.1049/nde2.12041","url":null,"abstract":"A series of high-performance linear and cross-linked polyimide (PI) aerogels with different molecular structures have been successfully synthesised using the freeze-drying process. In this study, the comprehensive regulation of microstructure, thermodynamic, thermal insulation and dielectric properties of PI aerogels are achieved by controlling the rigid/flexible structure and composition of polymerised monomers. The increase in rigidity of PI molecular structure could promote the formation of denser pores, which is beneficial to improve the thermodynamic and thermal insulation properties of aerogels. Notably, the cross-linked PI aerogel prepared by introducing cross-linking agent (tris(4-aminophenyl) amine, [TPA]) into linear PI exhibits high thermal stability (Td5% > 560°C), excellent ultralow permittivity (εr = 1.31, f = 106 Hz) and good thermal insulation property (k = 0.056 W/m · K). This innovative strategy promotes the wider application of the cross-linked polyimide aerogel in the field of integrated circuits and aerospace exploration.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 3","pages":"76-85"},"PeriodicalIF":2.7,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12041","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47440867","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

Thermal stability of piezoelectricity in polylactide polymers and related piezoelectric minimotor application 聚丙交酯聚合物中压电的热稳定性及相关的压电微型电机应用

IF 2.7

IET Nanodielectrics Pub Date : 2022-11-09 DOI: 10.1049/nde2.12038

Jinxi Zhang, Yonggui Wang, Junyuan Tian, Xiangchen Xu, Weidong Wang, Kailiang Ren

{"title":"Thermal stability of piezoelectricity in polylactide polymers and related piezoelectric minimotor application","authors":"Jinxi Zhang, Yonggui Wang, Junyuan Tian, Xiangchen Xu, Weidong Wang, Kailiang Ren","doi":"10.1049/nde2.12038","DOIUrl":"10.1049/nde2.12038","url":null,"abstract":"Piezoelectric polymers have been widely used in a variety of applications, including tactile sensors, energy harvesting, polymer actuators, and biological devices. In this investigation, we fabricated the PLLA (poly(L-lactic Acid)-based bimorph structures for piezoelectric motor applications. First, a strain measurement setup was established to measure the strain of the PLLA and PDLA film at different temperatures. The effective piezoelectric constants d14 calculated for the PLLA and PDLA films were 10.2 pC/N and 9.4 pC/N, respectively. Furthermore, the PLLA films showed a strong thermostability of piezoelectricity at 130°C. The PLLA bimorph minimotor showed the maximum load of 1.2 g and the maximum torque of 0.019 cN·m. The minimotors were capable of rotating a plastic hemisphere container in the clockwise and counterclockwise directions at 65 V voltage. Due to the light weight, low driving voltage, and thermal stability, the PLLA/PDLA motors show a great promise in future Braille display, robots, and mini-digital camera applications.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"5 3-4","pages":"132-138"},"PeriodicalIF":2.7,"publicationDate":"2022-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12038","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43881955","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: 4

Ferroelectrets: Recent developments 铁驻极体：最新发展

IF 2.7

IET Nanodielectrics Pub Date : 2022-09-10 DOI: 10.1049/nde2.12036

Xunlin Qiu, Yuqing Bian, Jiawen Liu, Yanxun Xiang, Taotao Ding, Wujun Zhu, Fu-Zhen Xuan

{"title":"Ferroelectrets: Recent developments","authors":"Xunlin Qiu, Yuqing Bian, Jiawen Liu, Yanxun Xiang, Taotao Ding, Wujun Zhu, Fu-Zhen Xuan","doi":"10.1049/nde2.12036","DOIUrl":"10.1049/nde2.12036","url":null,"abstract":"Ferroelectrets (also called piezoelectrets) are relatively young members in the family of piezo-, pyro- and ferroelectric materials. They exhibit ferroic behaviour phenomenologically undistinguishable from that of traditional ferroelectrics, although the materials per se are essentially non-polar space-charge electrets with artificial macroscopic dipoles (i.e. internally charged cavities). Since ferroelectrets not only represent a scientific curiosity but also have great application potential, they have attracted tremendous attention from science and industry. The research and development of ferroelectrets has witnessed significant progress in the past few years. New ferroelectrets with large transverse piezoelectric activity, biodegradable ferroelectrets as well as 3-D printed ferroelectrets are reported. Charging methods of high efficiency are proposed based on better understanding of the physico-chemical processes during charging. New insights into the piezoelectricity of ferroelectrets are provided. The development of ferroelectret-based piezoelectric-magnetic multimodal transducer films opens up new avenues for the research of ferroelectrets. Particularly, more and more novel applications of ferroelectrets in flexible pressure sensors, health monitoring, energy harvesting, air-coupled ultrasonic non-destructive testing etc. are reported. Here, these exciting recent advancements in the field of ferroelectret research are reviewed and discussed.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"5 3-4","pages":"113-124"},"PeriodicalIF":2.7,"publicationDate":"2022-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12036","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49606123","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: 7

Preparation and properties of different dielectric films with Al metal electrode 不同Al金属电极介质膜的制备及性能研究

IF 2.7

IET Nanodielectrics Pub Date : 2022-09-01 DOI: 10.1049/nde2.12037

Qi Dong, Shao-Long Zhong, Qi-Kun Feng, Ming-Sheng Zheng, Jiang-Bo Ping, Zhi-Min Dang

引用次数: 2

Sandwich-structured PPy-TiO2/PVDF composite films with outstanding dielectric properties and energy density 具有优异介电性能和能量密度的夹层结构PPy - tio2 /PVDF复合薄膜

IF 2.7

IET Nanodielectrics Pub Date : 2022-04-01 DOI: 10.1049/nde2.12031

Jinyue Qiu, Ling Weng, Xiaorui Zhang, Yu Su

引用次数: 8

Fabrication and actuation characterisation of a new UV curing acrylic dielectric elastomer 一种新型紫外光固化丙烯酸介电弹性体的制备及其致动特性

IF 2.7

IET Nanodielectrics Pub Date : 2022-03-12 DOI: 10.1049/nde2.12035

Wen-Zhuo Dong, Yu Zhao, Li-Juan Yin, Zhi-Min Dang

引用次数: 5

Identification of nanocomposites agglomerates in scanning electron microscopy images based on semantic segmentation 基于语义分割的扫描电镜图像中纳米复合材料团聚体识别

IF 2.7

IET Nanodielectrics Pub Date : 2022-03-04 DOI: 10.1049/nde2.12034

Yu Bai, Yan Wang, Dayuan Qiang, Xin Yuan, Jiehui Wu, Weilong Chen, Sai Zhang, Yanru Zhang, George Chen

{"title":"Identification of nanocomposites agglomerates in scanning electron microscopy images based on semantic segmentation","authors":"Yu Bai, Yan Wang, Dayuan Qiang, Xin Yuan, Jiehui Wu, Weilong Chen, Sai Zhang, Yanru Zhang, George Chen","doi":"10.1049/nde2.12034","DOIUrl":"10.1049/nde2.12034","url":null,"abstract":"The agglomeration causes a significant challenge to nanodielectrics. Identification of agglomerates in scanning electron microscopy (SEM) images is an important step of solving this issue. Motivated by the fast development of image recognition in computer vision, we propose a new approach for agglomerates identification in SEM images of nanodielectrics by semantic segmentation, which is more efficient and accurate than traditional methods. Three models based on convolutional neural networks are investigated in this work, namely pixel blocks classification network, full convolutional segmentation network employed with data augmentation and unsupervised self-encoding network. All three networks can preliminarily identify agglomerates of spherical silica-based blend polyethylene nanocomposites. The mean intersection over union (mIoU) of pixel blocks classification network is 0.843 and it takes 25 s to process an image. Full convolutional segmentation network only needs 0.059 s to process a sample, with a mIoU of 0.777. Unsupervised self-encoding network can reach a mIoU of 0.747 at a speed of 5.806 s. According to the amount of data sets, and requirements for different speed and accuracy, three kinds of networks can be flexibly selected.","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"5 2","pages":"93-103"},"PeriodicalIF":2.7,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45920131","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: 0

A review on the research progress and future development of nano-modified cellulose insulation paper 综述了纳米改性纤维素绝缘纸的研究进展及发展前景

IF 2.7

IET Nanodielectrics Pub Date : 2021-12-21 DOI: 10.1049/nde2.12032

Chao Tang, Rui Chen, Jinzhu Zhang, Xiao Peng, Binghao Chen, Liusheng Zhang

引用次数: 0