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27. Dielectric Elastomer Network with Large Side Groups Achieves Large Electroactive Deformation for Soft Robotic Grippers.

Author

Dou, Xiaorong, Chen, Zheqi, Ren, Fuhao, He, Lijun, Chen, Jianxiong, Yin, Li‐Juan, Luo, Yingwu, Dang, Zhi‐Min, and Mao, Jie

Subjects
ELECTROACTIVE substances, POLYMER networks, ALKYL group, SOFT robotics, HELPING behavior, ELASTOMERS
Abstract

Dielectric elastomer actuators (DEAs) face an acknowledged challenge: On the one hand, the majority of elastomers only achieve small electroactive deformation (<20%) in the absence of prestretch; on the other hand, rare elastomers capable of showing large electroactive deformation require relatively complicated processing and chemistry. This work addresses this challenge by fabricating an elastomer with a network of large side groups, which achieves a very large electroactive deformation (218%) without pre‐stretch. This elastomer can be rapidly and massively fabricated within a few min, by polymerizing a commercial monomer with a large alkyl side group. The large side groups in the polymer network repel each other and extend the load‐bearing strands, which results in a pronounced strain‐hardening behavior. This behavior helps the elastomer to get rid of electromechanical instability during actuation and hence to exhibit a large electro‐active deformation, a high energy density (>> human muscle), and a large output force (≈500 times self‐weight). the elastomer capable of manufacturing a soft electroactive gripper is demonstrated with large deformation, large force, and rapid response, which enables grasping fragile objects of various complex shapes in an agile away. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Flexible High‐Temperature Polymer Dielectrics Induced by Ultraviolet Radiation for High Efficient Energy Storage.

Author

Pei, Jia‐Yao, Zhu, Jing, Yin, Li‐Juan, Zhao, Yu, Yang, Minhao, Zhong, Shao‐Long, Feng, Qi‐Kun, and Dang, Zhi‐Min

Subjects
ENERGY dissipation, ENERGY density, DIELECTRIC films, POWER electronics, ULTRAVIOLET radiation, SPACE charge, ENERGY storage
Abstract

Polymer‐based dielectrics with fast electrostatic energy storage and release, are crucial for advanced electronics and power systems. However, the deterioration of insulation performance and charge–discharge efficiency of polymer dielectrics at elevated temperatures and high electric fields hinder the applications of capacitors in harsh environments. Herein, a facile and scalable approach is reported to fabricating flexible high‐temperature polymer dielectrics for high‐efficiency energy storage by ultraviolet irradiation. The resultant dielectric films exhibit an augment of 493% in energy density and exceeding 800% in discharge efficiency at 200 °C (3.2 J cm−3 and over 90% discharge efficiency at 480 M V−1m for irradiated polyetherimide (PEI), 0.54 J cm−3, and below 10% discharge efficiency at 400 MV m−1 for pristine PEI) and excellent cycle performance. The injected space charge is found to be the dominant contributor to energy loss during the charge–discharge process. Free radicals introduced by ultraviolet irradiation can act as deep traps to capture injected charge and suppress space charge migration. This work clarifies the contribution of space charge to energy loss and demonstrates the effectiveness of ultraviolet irradiation in improving the capacitive performance of high‐temperature polymer dielectrics. These findings provide a novel paradigm for the rational design of high‐temperature polymer dielectrics for high‐efficiency energy storage. [ABSTRACT FROM AUTHOR]

Published
2024
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30. Optimizing Energy Storage Performance in Polymer Dielectrics through Dual Strategies: Constructing "Peaked" Barrieras and Enhancing Carrier Scattering.

Author

Meng, Zhaotong, Zhang, Tiandong, Zhang, Changhai, Dang, Zhi‐Min, and Chi, Qingguo

Subjects
ELECTRIC power systems, ENERGY density, CHARGE injection, CHARGE carriers, HIGH temperatures
Abstract

Dielectric capacitors play a pivotal role in the advancement of electric power systems and emerging energy technologies. However, the deterioration of dielectric performance in energy storage materials at elevated temperatures represents a significant challenge. In this study, organic electron‐scattering agents into polyetherimide (PEI) are introduced, creating a "peaked barrier" to impede charge carrier transport. By doping PEI with an ultralow volume fraction (0.8%) of the organic molecule filler 4‐(dimethylamino)phenylboronic acid (4‐NB), the electron‐repelling nature of 4‐NB is leveraged in order to regulate charge carrier injection and transport in a synergistic manner. Consequently, the discharged energy density of the PEI composite material increases to 7.93 J cm−3 (720 kV mm−1) at 30 °C. At 150 °C, the discharged energy density increases to 5.21 J cm−3 (580 kV mm−1). In both cases, the charge and discharge efficiencies are maintained at 90%. It is noteworthy that the prepared PEI composite material also exhibits excellent charge dissipation characteristics, maintaining stable charge and discharge efficiency even after 50 000 charge–discharge cycles. In summary, the study's design concept systematically optimizes the processes of charge carrier injection, transport, and dissipation. This approach offers a novel perspective for the development of dielectrics that are suitable for long‐term energy storage. [ABSTRACT FROM AUTHOR]

Published
2024
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31. AI safety of film capacitors.

Author

Zhang, Yong‐Xin, Chen, Fang‐Yi, Liu, Di‐Fan, Wang, Jian‐Xiao, Feng, Qi‐Kun, Jiang, Hai‐Yang, Wang, Xin‐Jie, Zhao, Hong‐Bo, Zhong, Shao‐Long, Shah, Faisal Mehmood, and Dang, Zhi‐Min

Published
2024
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38. Simultaneously enhanced impact strength and dielectric properties of an epoxy resin modified with EHTPB liquid rubber

Author

Zhou, Wenying, Li, Xu, Cao, Dan, Li, Ying, Zhang, Caihua, Li, Zhen, Che, Fuxin, Li, Ting, Cai, Huiwu, and Dang, Zhi-Min

Subjects
Rubber, Dielectric materials, Electrical conductivity, Epoxy resins, Hydroxides, Engineering and manufacturing industries, Science and technology
Abstract

Abstract To simultaneously improve the impact strength and dielectric properties of cured epoxy (EP), herein we explore liquid rubber toughened EP based on a nonpolar epoxidized hydroxyl-terminated polybutadiene (EHTPB), where [...]

Published
2020
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45. Study on the Structure–Function Relationship Between Metallized Layer and Self-Healing Morphology in Metallized Film

Author

Wu, Zhi-Yuan, Wang, Ze, Liu, Jing-Zhou, Zhong, Shao-Long, Wang, Jian-Tao, Huang, Lei, Dang, Zhi-Min, and Wang, Wei

Abstract

Metallized polypropylene film capacitors (MPPFCs) are widely used in electronic devices for their unique merits: self-healing. This work aims to explore the correlation mechanism between metallized layer structural parameters and self-healing properties in metallized polypropylene film (MPPF). The thicker electrode layer has a more irregular self-healing morphology and needs more energy to restore insulation at the same self-healing area compared to the thinner electrode layer, and the thicker electrode layer has a greater adhesive force, and the root mean square (rms) at $5~\Omega / \square$ thickness is 2.67 times larger than that at 50- $\Omega / \square$ electrode layer thickness. Different surface morphologies of MPPF and different potential differences are the reasons for different self-healing morphologies, which play an important role in self-healing properties, the potential difference at 5- $\Omega / \square$ electrode thickness is 149.2 mV, 1.92 times larger than that at 50- $\Omega / \square$ electrode thickness. The simulation model shows the different stages of plasma development in self-healing, and the plasma develops fast and then slows down in the final stage. The maximum electron temperature in self-healing plasma can reach over 4000 K. The model also explains the influence mechanism of adhesion force on the self-healing plasma and the structure change of the dielectric layer during the plasma process, the carbonized depth in 500 W/m2, thermal flux is $0.19~\mu $ m, but in 1 W/m2, and the carbonized depth is $0.65~\mu $ m, which is a threefold increase.

Published
2024
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49. Data sonification of film capacitors.

Author

Zhang, Yong‐Xin, Liu, Di‐Fan, Wei, Xin‐Yi, Wang, Xin‐Jie, Chen, Fang‐Yi, Feng, Qi‐Kun, Cao, Wen‐Yuan, Dong, Wen‐Zhuo, Shah, Faisal Mehmood, Liu, Yu‐Xiao, Wu, Zhi‐Yuan, Wang, Jian‐Tao, Zhong, Shao‐Long, and Dang, Zhi‐Min

Published
2024
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