Zwitterionic Liquid Dielectrics With High Permittivity at Room Temperature
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Solution Overview
Problem
Existing high dielectric constant materials, particularly zwitterions, are often crystalline solids at ambient temperature with low dielectric constants, limiting their application in soft robotics, electronics, and batteries due to poor rotational mobility.
Innovation Solution
Development of zwitterionic liquids with a dielectric constant ranging from 100 to 2000 at 20° C. to 70° C., synthesized through specific reactions and ion-exchange processes, maintaining liquid form for at least a month.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If zwitterions are used to increase dielectric constant, then dielectric constant should increase, but most zwitterions are crystalline solids at ambient temperature with low dielectric constant due to poor rotational mobility
Solution Approach 1:
The patent changes the physical state parameter of zwitterions from crystalline solid to liquid by modifying molecular structure (adding flexible alkyl chains, adjusting cation/anion combinations), which enables rotational mobility while maintaining high dielectric constant. The zwitterionic liquids exhibit dielectric constants of 100-2000 at 20-70°C, resolving the contradiction between solid-state rigidity and liquid-state mobility.
2Use of energy by moving object
If zwitterions are used for high energy density storage, then energy density should increase, but crystalline structure limits molecular rotation and reduces dielectric performance
Solution Approach 1:
The patent utilizes phase transition from crystalline solid to liquid state, creating zwitterionic liquids that maintain the high dielectric constant advantage of zwitterions while eliminating the rotational restrictions of crystalline structures. This phase change enables the material to achieve both high energy density (through high dielectric constant) and molecular mobility.
3Area of moving object
If zwitterions are synthesized for high dielectric constant, then dielectric constant should be high, but synthesis complexity increases
Solution Approach 1:
The patent develops a universal synthesis platform using common zwitterion precursors (amino acids, heterocyclic compounds) and standardized ion-exchange procedures that can produce multiple zwitterionic liquid variants with high dielectric constants. This multi-functional approach simplifies synthesis by using recurring structural motifs and generalizable reaction pathways rather than custom synthesis for each compound.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The zwitterionic liquids provide high dielectric constants suitable for enhancing energy density and ion transport in capacitors, electrostatic actuation in soft actuators, and improving device efficiency.
Implementation Method 1
The maximum energy density stored in a capacitor with an applied field E is (1/2)ε0εrE2, indicating increased energy density by using high dielectric constant materials
Implementation Method 2
Increasing εr is also essential for optimal ion transport by weakening the ion interaction energy (kq1q2/4πε0εrr)
Implementation Method 3
Soft actuators with high electrostatic pressure are more efficient in transducing the electrostatic energy into mechanical actuation, and the electrostatic pressure follows P=(1/2)ε0εrE2
Data Source
AI summary
Disclosed herein are high dielectric constant zwitterionic compounds of Formula (I) and methods of making the same. These materials are liquid near room temperature, with unprecedentedly high dielectric constants, making them both novel and useful. Dielectric constant can be tuned by choice of anion, choice of cation, choice of cation tail, and length of the linker that covalently connects the anion to the cation.