Reconfigurable shape-morphing dielectric elastomers using spatially varying electric fields.

Area of Science:

• Materials Science
• Soft Robotics
• Actuator Technology

Background:

• Dielectric elastomers offer large strains under electric fields, enabling applications like tunable lenses and tactile actuators.
• A key limitation in dielectric elastomer actuators has been the inability to achieve generalizable shape morphing, particularly controlling Gaussian curvature.

Purpose of the Study:

• To overcome the limitation of shape morphing in dielectric elastomers by enabling control over Gaussian curvature.
• To demonstrate a generalizable method for achieving voltage-tunable positive and negative Gaussian curvatures.

Main Methods:

• A layer-by-layer fabrication method was employed, incorporating shaped, carbon-nanotube-based electrodes between thin elastomer sheets.
• This approach creates internal, spatially varying electric fields within the dielectric elastomer.
• The method allows for the application of voltages to different sets of internal electrodes to reconfigure shapes.

Main Results:

• The study successfully produced voltage-tunable shapes with both negative and positive Gaussian curvatures.
• Demonstrated reconfigurable shapes by selectively applying voltages to different internal electrode sets.
• All induced shape changes were shown to be reversible upon removal of the applied voltage.

Conclusions:

• A fundamental limitation in dielectric elastomer shape morphing has been overcome by controlling Gaussian curvature.
• The developed method offers a generalizable approach for creating complex, reconfigurable soft actuators.
• This breakthrough has significant implications for the design of advanced soft robotic systems and tunable optical devices.