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Zwitterions Raise the Dielectric Constant of Soft Materials
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-11-24 , DOI: 10.1103/physrevlett.127.228001
Wenwen Mei 1 , August J Rothenberger 1 , Joshua E Bostwick 1 , Joshua M Rinehart 1 , Robert J Hickey 1 , Ralph H Colby 1
Affiliation  

Materials exhibiting high dielectric constants (ϵs) are critical for energy storage and actuators. A successful approach to increase ϵs is to incorporate polar additives (with high ϵs) but controlling the resulting dispersion state is difficult. Here, we show that significant ϵs increases are realized by adding zwitterions, which are small molecules with a cation and an anion separated by covalent bonds. The increase in ϵs with zwitterion addition is attributed to the large molecular dipole of zwitterions, ranging from 35 to 41 D, as experimentally quantified and confirmed using density functional theory. At elevated zwitterion concentration in an ethylene glycol medium, there is a nonlinear increase of ϵs that eventually saturates due to the strong Coulombic interactions between zwitterions. The presented work provides a fundamental molecular understanding of why zwitterions are effective additives in boosting ϵs in soft materials.

中文翻译:

两性离子提高软材料的介电常数

具有高介电常数的材料(ε) 对能量存储和执行器至关重要。一个成功的方法来增加ε 是加入极性添加剂(具有高 ε) 但控制由此产生的分散状态是困难的。在这里,我们证明了显着的ε增加是通过添加两性离子实现的,两性离子是由共价键分隔的阳离子和阴离子的小分子。的增加ε两性离子添加归因于两性离子的大分子偶极子,范围从 35 到 41 D,如实验量化和使用密度泛函理论证实的那样。在乙二醇介质中两性离子浓度升高时,存在非线性增加ε由于两性离子之间的强库仑相互作用,最终饱和。所呈现的工作提供了一个基本的分子理解为什么两性离子是有效的添加剂在促进ε 在柔软的材料中。
更新日期:2021-11-25
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