Phase-Change Composite Electroactive Actuator for High-Frequency Deformation
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Solution Overview
Problem
Conventional electroactive polymer materials used in devices like VR/AR eyewear have limited deformation amplitudes and stresses, which restrict their actuation efficiency and frequency, making it difficult to achieve large deformation without compromising switching speed and efficiency.
Innovation Solution
An electroactive device with a composite polymer material that includes a polymer matrix and inclusions of a deformable medium, such as a phase change material, dispersed throughout, allowing for reversible volume changes and enhanced actuation characteristics like high frequency, efficiency, amplitude, and stress when subjected to voltage, radiation, or temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional voltage-stimulated electroactive polymer materials are used, then rapid and efficient switching between un-deformed and deformed states is achieved, but the amplitude of deformation and the attendant stress are limited
Solution Approach 1:
The patent applies composite materials by combining electroactive polymer materials with deformable medium inclusions (such as liquid, gas, or liquid-gas mixtures) dispersed throughout the polymer matrix. This composite structure enables the material to achieve both rapid switching frequency and large deformation amplitude with high stress, resolving the contradiction between switching speed and deformation magnitude.
2Shape
If conventional electroactive polymer materials are used, then efficient actuation is achieved, but large deformation amplitudes cannot be achieved without compromising switching frequency
Solution Approach 1:
The composite polymer material combines the fast response characteristics of electroactive polymers with the large volume change capability of deformable medium inclusions. The inclusions undergo reversible volume changes in response to external stimuli (voltage, radiation, temperature, or pressure changes), enabling large deformation amplitudes while the electroactive polymer matrix maintains rapid actuation frequency, thus resolving the contradiction between deformation amplitude and actuation frequency.
3Speed
If conventional electroactive polymer materials are used, then rapid switching is achieved, but actuation stress is limited
Solution Approach 1:
The composite structure leverages the electroactive polymer matrix for rapid response and the deformable medium inclusions for generating high actuation stress through reversible volume changes. The interaction between the matrix and inclusions enables simultaneous achievement of fast switching speed and high actuation stress, resolving the contradiction between these two parameters.
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 electroactive device achieves actuation frequencies of at least 1 MHz, efficiencies of at least 20%, amplitudes of at least 100%, and stresses of at least 1 MPa, enabling larger deformations while maintaining rapid switching and efficiency.
Implementation Method 1
the deformable medium may be a phase change material that is adapted to undergo a reversible volume change incident to a phase transformation
Implementation Method 2
a dimension of the electroactive polymer element may be changed by applying a voltage between the primary electrode and the secondary electrode
Data Source
AI summary
A device, such as an electroactive device, may include primary electrode and a secondary electrode overlapping at least a portion of the primary electrode. An electroactive polymer element may include a composite polymer material and is disposed between and abuts each of the primary electrode and the secondary electrode. A phase change or other deformable medium such as a liquid, a gas, or a liquid-gas mixture may be disposed as inclusions within the polymer material. The device can be actuated by the application of a voltage between the electrodes and the attendant formation of a Maxwell stress, exposing the deformable medium to a source of radiation, changing a pressure of the deformable medium, or changing a temperature of the deformable medium, e.g., about a phase transformation temperature of the phase change medium.