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High energy storage capability of perovskite relaxor ferroelectrics via hierarchical optimization 被引量:7
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作者 Min-Hao Zhang Jun-Lei Qi +4 位作者 Yi-Qian Liu Shun Lan zi-xi luo Hao Pan Yuan-Hua Lin 《Rare Metals》 SCIE EI CAS CSCD 2022年第3期730-744,共15页
Ultrafast charge/discharge process and ultrahigh power density enable dielectrics essential components in modern electrical and electronic devices, especially in pulse power systems. However, in recent years, the ener... Ultrafast charge/discharge process and ultrahigh power density enable dielectrics essential components in modern electrical and electronic devices, especially in pulse power systems. However, in recent years, the energy storage performances of present dielectrics are increasingly unable to satisfy the growing demand for miniaturization and integration, which stimulates further researches on dielectrics with higher energy density and efficiency.Among various inorganic dielectrics, perovskite relaxor ferroelectrics are recognized as promising candidates for energy storage applications, with high permittivity and relatively high efficiency. Here, we focus on recent progress and achievements on optimizing perovskite relaxor ferroelectrics toward better energy storage capability through hierarchical design. The principles and key parameters of dielectric energy storage, together with the definition of majority types of dielectrics, are introduced at first. Strategies within various scales include domain, grain size, orientation, and composite engineering are summarized. The existing challenges are presented and future prospects are proposed in the end, with the background of both academic explorations and industrial applications. 展开更多
关键词 DIELECTRIC Energy storage CAPACITANCE PEROVSKITE Relaxor ferroelectric
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在离子液体介质中对甲基苯乙烯阳离子聚合的研究
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作者 张晓茜 周旋 +5 位作者 孙英娟 岳丽娜 石永香 许可 罗梓兮 伍一波 《高分子学报》 SCIE CAS CSCD 北大核心 2019年第4期375-383,共9页
以离子液体为介质,通过密度泛函理论计算和实验分析,研究了离子液体对甲基苯乙烯(p-MeSt)的阳离子聚合的影响;考察了不同引发体系和不同离子液体对聚合的影响.通过核磁共振氢谱(1H-NMR)和傅里叶红外变换光谱(FTIR)对产物结构进行表征,... 以离子液体为介质,通过密度泛函理论计算和实验分析,研究了离子液体对甲基苯乙烯(p-MeSt)的阳离子聚合的影响;考察了不同引发体系和不同离子液体对聚合的影响.通过核磁共振氢谱(1H-NMR)和傅里叶红外变换光谱(FTIR)对产物结构进行表征,凝胶渗透色谱(GPC)测定产物分子量与分布,温度记录仪跟踪测定体系温度与聚合时间的关系.结果表明,在离子液体中枯基醇(CumOH)/BF3·OEt2引发体系具有较好的引发效果;与传统分子溶剂相比,在1-丁基-3-甲基咪唑双(三氟甲烷磺酰)亚胺(缩写[Bmim][NTf2])离子液体中得到的聚合产物分子量和产率均较高(达99%),且分子量分布较窄(Mw/Mn~2.0);离子液体在阳离子聚合中仅是惰性溶剂,未直接参与反应,虽然离子液体的离子环境并不能完全抑制链转移反应,但具有稳定活性种和分散正电荷的作用,且使聚合反应更温和;离子液体回收利用实验结果表明,离子液体可多次循环利用,对产物影响不大;最终推导了离子液体中由CumOH/BF3·OEt2引发的p-MeSt阳离子聚合的基元反应机理. 展开更多
关键词 阳离子聚合 离子液体 对甲基苯乙烯 聚合机理 绿色溶剂
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