Ionic Electroactive Polymer Actuator with Plasma-Treated Electrodes
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Solution Overview
Problem
Existing electrically driven mechanochemical actuators face limitations such as requiring high voltages, achieving only small length changes, and needing a wet environment to function, which restricts their application and reliability.
Innovation Solution
An electrically driven mechanochemical actuator using an ionic electroactive polymer with electrodes treated by plasma or electrical etching, encased in an elastomeric 'skin' with an electrolyte solution, allowing for significant elongation without high voltage requirements and operation outside a liquid environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If ionic electroactive polymers are used to achieve significant elongation, then the actuator can function without high voltage, but the electrode-material connection becomes unstable over time
Solution Approach 1:
The electrodes are pre-treated with plasma or electrical etching before assembly to create permanent surface modifications that ensure stable connection. This preliminary action prevents future connection failures by establishing strong adhesion sites before the actuator begins operation.
Solution Approach 2:
The invention uses composite structures combining treated electrodes with ionic electroactive polymers and electrolyte solutions. The plasma-treated or etched electrode surfaces create composite interfaces that maintain stable electrical and mechanical communication between dissimilar materials under mechanical motion.
2Reliability
If ionic electroactive polymers are used in wet environment, then the actuator functions properly, but the device complexity increases due to encasement requirements
Solution Approach 1:
The invention uses flexible encapsulating coatings or elastomeric skins to contain the electrolyte solution and protect the ionic electroactive polymer. These thin film encasements maintain the necessary wet environment while adding minimal structural complexity and allowing the actuator to function outside liquid environments.
Solution Approach 2:
The electrolyte solution acts as an intermediary medium that enables ionic conduction within the polymer while the elastomeric skin serves as an intermediary barrier that contains the liquid without preventing the electrochemical reactions necessary for actuation.
3Device complexity
If traditional electrodes are used with electroactive material, then the assembly is simple, but the electrical and mechanical communication disconnects during motion
Solution Approach 1:
The electrodes undergo preliminary plasma treatment or electrical etching to modify their surface properties before assembly. This creates permanent adhesion sites that ensure the electrode remains electrically and mechanically connected to the electroactive material during subsequent motion and deformation.
Solution Approach 2:
The invention changes the surface parameters of the electrodes through plasma treatment or etching, modifying surface energy, roughness, or chemical composition to enhance adhesion. These parameter changes ensure stable electrical and mechanical communication without complicating the overall assembly process.
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 solution enables actuators with greater than a few percent elongation, improved electrode-material communication, and the ability to function in various environments, enhancing their suitability for prosthetics, robotics, and other applications.
Implementation Method 1
An ionic electroactive polymer-based material... converts electrical energy into mechanical energy in the form of movement
Implementation Method 2
ionized poly(acrylamide) gels, immersed in 50% acetone and 50% water mixture, collapsed and physically shrunk in the presence of an electric field
Implementation Method 3
electrodes that have been treated by exposure to a plasma or exposure to electrical etching
Implementation Method 4
exposure to electrical etching
Implementation Method 5
means to encase the ionic electroactive polymer material and the electrolyte solution in an elastomeric 'skin'
Data Source
AI summary
This invention describes an electrically driven mechanochemical actuator comprising an electroactive material capable of converting electrical to mechanical energy in communication with a first electrode and a second electrode, the electroactive material immersed in an electrolyte, the electroactive material and electrolyte surrounded by a flexible encapsulating coating, wherein a portion of the first electrode and a portion of the second electrode penetrate there through.