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Created
January 02, 2022 16:50
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rhc5
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Added Creator Ralph Colby
January 02, 2022 16:50
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rhc5
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Added
ZwitterionsinEG_final.pdf
January 02, 2022 16:52
by
rhc5
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January 02, 2022 16:52
by
rhc5
License
- http://creativecommons.org/publicdomain/mark/1.0/
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Published
January 02, 2022 16:52
by
rhc5
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Updated
March 22, 2022 16:18
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[unknown user]
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Updated
Publisher, Publisher Identifier (DOI), Description
Show Changes
February 28, 2024 17:24
by
avs5190
Publisher
Publisher Identifier (DOI)
- https://doi.org/10.1103/PhysRevLett.127.228001
Description
Materials exhibiting high dielectric constants (ε_s) are critical for energy storage and actuators. A successful approach to increase ε_s by incorporating polar additives (with high ε_s) but controlling the resulting dispersion state is difficult. Here, we show that significant ε_s increases are realized by adding zwitterions, which are small molecules with a cation and an anion separated by covalent bonds. The increase in ε_s with zwitterion addition is attributed to the large molecular dipole of zwitterions, ranging from 35 to 41 Debye, as experimentally quantified, and confirmed using density functional theory. At elevated zwitterion concentration in an ethylene glycol medium, there is a non-linear increase of ε_s 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 ε_s in soft materials.
- Materials exhibiting high dielectric constants (εs) are critical for energy storage and actuators. A successful approach to increase εs by incorporating 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 non-linear 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.
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February 28, 2024 17:25
by
avs5190
Ralph Colby
- Ralph H. Colby
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Added Creator Wenwen Mei
February 28, 2024 17:25
by
avs5190
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Added Creator August J. Rothenberger
February 28, 2024 17:25
by
avs5190
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Added Creator Joshua E. Bostwick
February 28, 2024 17:25
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avs5190
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Added Creator Joshua M. Rinehart
February 28, 2024 17:25
by
avs5190
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Added Creator Robert J. Hickey
February 28, 2024 17:25
by
avs5190
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Updated
April 04, 2024 10:21
by
[unknown user]