Ion-Immobilized Dielectric Layer for Transducer Reliability
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Solution Overview
Problem
Dielectric layers in transducers face challenges in achieving both high resistance to dielectric breakdown and large electrostatic attraction, as silicone rubber offers high resistance but low polarizability, while acrylic and nitrile rubbers have high dielectric constants but low electric resistance, leading to potential dielectric breakdown and leakage currents.
Innovation Solution
A reactive ionic liquid with an alkoxysilyl group anion and specific cations like imidazolium, ammonium, or phosphonium is used, immobilized to metal oxide particles and elastomers, creating an ion-immobilized dielectric layer that prevents ion migration and enhances electrostatic attraction without compromising dielectric breakdown resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone rubber is used as the dielectric layer material, then resistance to dielectric breakdown is improved, but dielectric constant deteriorates
Solution Approach 1:
The patent uses composite materials by combining silicone rubber with ion-containing compounds (such as ionic liquids or ionomers). This composite structure allows the dielectric layer to simultaneously achieve high dielectric constant from the ion-containing compound and high resistance to dielectric breakdown from the silicone rubber matrix, thereby resolving the contradiction between these two properties.
Solution Approach 2:
The patent introduces ion-containing compounds at specific locations within the dielectric layer structure (either as additives dispersed in the silicone rubber or as interfacial layers between the electrode and silicone rubber). This localized introduction of ionic groups enhances the dielectric constant and charge accumulation capability without compromising the overall structural integrity and breakdown resistance provided by the silicone rubber.
2Force
If acrylic or nitrile rubber is used as the dielectric layer material, then dielectric constant is improved, but resistance to dielectric breakdown deteriorates
Solution Approach 1:
The patent combines acrylic or nitrile rubber with ion-containing compounds to create a composite dielectric layer. The ion-containing compounds further enhance the dielectric constant and improve charge retention by reducing leakage currents, while the rubber matrix provides the necessary flexibility and structural support, achieving both high electrostatic attraction and adequate breakdown resistance.
3Force
If ion-containing layer is added to improve charge accumulation, then dielectric constant is improved, but ion migration to high-resistance layer occurs causing dielectric breakdown
Solution Approach 1:
The patent introduces a protective layer (such as a crosslinked polymer layer or a specific interface layer) between the ion-containing layer and the high-resistance dielectric layer. This intermediary layer acts as a barrier that prevents ion migration from the ion-containing layer to the high-resistance layer, thereby eliminating the cause of dielectric breakdown while preserving the charge accumulation benefits of the ion-containing layer.
Solution Approach 2:
The patent applies preliminary protective measures by incorporating crosslinked structures or protective coatings in advance within the dielectric layer design. These pre-established protective features prevent ion migration before it can cause dielectric breakdown, addressing the reliability issue proactively while maintaining the electrostatic attraction enhancement from ion-containing compounds.
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 ion-immobilized dielectric layer effectively suppresses dielectric breakdown and maintains high electrostatic attraction, ensuring reliable transducer performance by immobilizing ions and reducing leakage currents, thus achieving desired force and displacement outputs.
Implementation Method 1
the anion has (a1) a reactive group that consists of an alkoxysilyl group
Implementation Method 2
A higher dielectric constant allows the layer to accumulate more charges therein
Implementation Method 3
when a voltage applied between the electrodes is increased, an electrostatic attraction between the electrodes increases
Data Source
AI summary
An ion-immobilized metal oxide particle includes a metal oxide particle and an anion that itself includes a) a reactive group that consists of an alkoxysilyl group and b) an anionic group consisting of a carboxylate (—COO−) group or a sulfonate (—SO3−) group, the anion being immobilized to the metal oxide particle via a silanol group derived from the reactive group. An elastomer includes the ion-immobilized metal oxide particle, and a transducer includes the elastomer.