Article
Materials Science, Multidisciplinary
Yan Yu, Bin Huang, Yan Zhao, Yunfeng Zhao, Lina Dai, Zhijie Zhang, Hua-Feng Fei
Summary: Polysiloxane-based dielectric elastomers have great potential as electroactive soft materials, but their low permittivity has hindered practical applications. This study demonstrates that introducing cyanosilicone oil into the elastomer matrix can significantly increase the permittivity and enhance the dielectric relaxation processes. The resulting elastomer composites exhibit lower Young's modulus and dielectric loss.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Materials Science, Ceramics
Yizhou Qian, Yujin Wang, Lei Chen, Yu Zhou
Summary: A series of (Ti0.5Nb0.5)C-x wt.% SiC (x = 0, 5, 10, 20) composites with dense microstructures and well-dispersed SiC particles were prepared by spark plasma sintering. The Vickers hardness, Young's modulus, and fracture toughness of the composites increased with the increment of SiC content.
CERAMICS INTERNATIONAL
(2022)
Article
Polymer Science
S. Soreto Teixeira, Nuno Gama, Teresa Cordeiro, A. Barros-Timmons, Madalena Dionisio, Manuel P. F. Graca, L. Cadillon Costa
Summary: Composites of LiFe5O8 (LFO) particles dispersed in PLLA were prepared by solvent casting, showing a decrease in crystallinity with increasing LFO content, good dispersion of LFO particles, and no interaction with the polymeric matrix. Impedance spectroscopy revealed dynamic relaxation processes at lower LFO content, while conductivity dominated at higher concentrations following the percolation law. Applications can vary depending on LFO content, with energy storage for low concentrations and electromagnetic radiation shielding for concentrations above the percolation threshold.
Article
Materials Science, Multidisciplinary
Viktor Myroshnychenko, Stanislav Smirnov, Pious Mathews Mulavarickal Jose, Christian Brosseau, Jens Foerstner
Summary: In this study, the effective nonlinear dielectric response of a stochastic paraelectric-dielectric composite was investigated using different microstructure models and numerical calculation methods. The percolation threshold in the composite was found to govern the critical behavior of the effective permittivity and tunability, with tunability increasing as a function of dielectric phase concentration. The results provide insights into the distinct nonlinear behavior of 2D and 3D stochastic composites and can guide the design of novel composites with controlled morphology and tailored permittivity and tunability.
Article
Materials Science, Composites
Povilas Bertasius, Sebastien Schaefer, Jan Macutkevic, Juras Banys, Algirdas Selskis, Vanessa Fierro, Alain Celzard
Summary: This article investigates the dielectric properties of PDMS nanocomposites filled with SrTiO3 nanoparticles, showing that dielectric dispersion occurs at lower temperatures.
POLYMER COMPOSITES
(2021)
Article
Materials Science, Composites
Wenju Wu, Yingjie Jiang, Meilin Zhong, Suting Liu, Bing Yu, Nanying Ning, Ming Tian, Liqun Zhang
Summary: This study investigates the effect of dielectric constant and elastic modulus on the energy harvesting performances of DEGs. The results show that the dielectric constant has a significant influence on the generated energy and energy density, while the elastic modulus has little effect.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Weili Wang, Guoxun Sun, Xiaoning Sun, Zhixuan Zhang, Jiatai Zhang, Yanjie Liang, Jianqiang Bi
Summary: The electromagnetic wave absorption performance of high-entropy transition metal carbides was investigated in the frequency range of 2 GHz to 18 GHz. It was found that the high-entropy transition metal carbides exhibited good electromagnetic wave absorbing properties, which were influenced by the solid-solution elements. In particular, the (Ti0.2Zr0.2-Mo0.2Nb0.2Ta0.2)C with a thickness of 1.50 mm showed a minimal reflection loss of -32.1 dB, and the effective absorption bandwidth was in the frequency range of 13-18 GHz. The results suggest that high-entropy transition metal carbides have potential applications in various fields.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Materials Science, Multidisciplinary
Dingchang Zhang, Christoph Kenel, David C. Dunand
Summary: Liquid ink-printing followed by sintering is used to fabricate WC-Co microlattices and cutting tools. The microstructure and hardness of WC-xCo are studied for different carbide-to-binder ratios and sintering temperatures, with an emphasis on the effects of Co content on densification and mechanical properties. The study also demonstrates the infiltration of Cu into WC-Co lattices to form dense composites with improved thermal conductivity and ductility for cutting tool applications.
Article
Materials Science, Composites
Zilong Xie, Dingyao Liu, Yang Xiao, Ke Wang, Qin Zhang, Kai Wu, Qiang Fu
Summary: Polymer dielectrics have the potential for high breakdown strength and low dielectric loss, but suffer from low permittivity. Adding high permittivity filler in polymer can increase the permittivity, but it also decreases the breakdown strength and increases the dielectric loss. Fillers with lower permittivity can enable higher breakdown strength and lower dielectric loss by removing high electric field. However, this conclusion remains controversial due to experimental interferences.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Composites
Yun Wei, Minhan Cheng, Min Wang, Qiang Fu, Hua Deng
Summary: In this study, BaTiO3 and nickel nanowires were dispersed in polyimide through solution blending and magnetic field orientation, resulting in improved dielectric constant and suppressed conductive paths. The effect of magnetic field induced orientation of nickel nanowires on dielectric properties was also investigated, with vertically oriented nanowires showing positive influence on increasing dielectric constant and suppressing dielectric loss.
COMPOSITES COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Yu Zeng, Lu Tang, Zengnian Xin, Fangfang Guo, Guijin Li, Nan Chen, Guoping Du
Summary: This study fabricated composites of Ag-decorated Ti3C2Tx MXene and silicone rubber (SR) to improve the dielectric properties of polymer composites. The Ti3C2Tx MXene-Ag/SR composites showed higher dielectric constants and lower loss tangents compared to Ti3C2Tx MXene/SR composites. The composites also exhibited excellent mechanical properties. This work provides a method to obtain polymer-based composites with high dielectric and mechanical performances for various applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Kai Zhai, Shaohui Chen, Chengduo Wang, Qingkui Li, Benshuang Sun, Jilin He
Summary: A novel low-cost WC-CoCuFeNi cemented carbide has been produced using spark plasma sintering technology. The newly-developed cemented carbides exhibit a good combination of hardness and fracture toughness, making them a promising substitute for WC-Co.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Review
Polymer Science
Quan Wang, Junbo Che, Weifei Wu, Zhendong Hu, Xueqing Liu, Tianli Ren, Yuwei Chen, Jianming Zhang
Summary: Due to the trend of multi-function, integration, and miniaturization of electronics, traditional dielectric materials are difficult to satisfy new requirements. High dielectric polymer composites have attracted wide attention due to their outstanding processibility, good designability, and dielectric properties. In this review, the influences of matrix, fillers, and filler arrangement on dielectric properties are systematically summarized, and the challenges and prospects of high dielectric polymer composites are proposed.
Article
Materials Science, Ceramics
Sangita Chavda, Nehanshi Limbasiya, Poonam Vamja, Ajay Vaishnani, Kush Vachhani, Bharavi Hirpara, Manjula Kandoliya, Keval Gadani, Davit Dhruv, A. D. Joshi, P. S. Solanki, N. A. Shah
Summary: In this study, CdO-alumina (Al2O3) nano-micro composites were successfully prepared and characterized. The analysis included microstructural properties, crystallinity, energy band gap, dielectric behavior, ac conductivity, and impedance behavior of the pure and composite materials. The findings are significant for a better understanding and potential applications of CdO and Al2O3 composites.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Jiaojiao Hu, Hang Li, Jiangliang Li, Qiujie Wu, Jiewen Huang, Jian Kong, Yan Shi, Guichang Zhang, Dangsheng Xiong
Summary: The microstructure, mechanical and tribological properties of TaC-Ag films with different contents of Ag atoms were investigated, and the effect of Ag doping on the strength of TaC-Ag films was explored. It was found that at low Ag atom content, TaC-Ag films exhibited high hardness and toughness, while with increasing Ag content, the hardness of TaC-Ag films decreased.
CERAMICS INTERNATIONAL
(2022)