Fabrication Process of Silicone-based Dielectric Elastomer Actuators

Area of Science:

• Materials Science
• Polymer Science
• Robotics

Background:

• Dielectric elastomer transducers (DETs) are soft, stretchable capacitors with large actuation strains.
• Traditional DET fabrication using acrylic elastomers and hand-applied electrodes results in poor reproducibility, viscoelastic creep, and short device lifetimes.
• Existing DETs have diverse applications, including tunable optics, haptic devices, energy harvesting, and soft robotics.

Purpose of the Study:

• To develop a reproducible and reliable fabrication process for dielectric elastomer transducers (DETs).
• To address the limitations of existing DETs, such as poor reproducibility and short lifetimes.
• To enable high-performance soft actuators for various advanced applications.

Main Methods:

• Fabrication of thin silicone membranes cast on polyethylene terephthalate (PET) substrates with a water-soluble sacrificial layer.
• Release and prestretching of silicone membranes.
• Patterning of robust, compliant electrodes using carbon black particles dispersed in a silicone matrix via a stamping technique.
• Assembly and testing of the fabricated DETs.

Main Results:

• Demonstrated a complete process flow for reproducible DET fabrication using silicone films.
• Developed precisely-defined compliant electrodes with high adhesion to the silicone membrane.
• Achieved reliable DETs that overcome the limitations of previous acrylic-based actuators.

Conclusions:

• The presented silicone-based DET fabrication process offers a reliable and reproducible method for creating high-performance soft actuators.
• This advancement facilitates the development of advanced applications requiring compliant and durable soft robotic components.
• The improved fabrication method paves the way for wider adoption of DETs in various technological fields.