Dynamic Bonding Enabled Ambient-Driven Motors.

Area of Science:

• Materials Science
• Soft Robotics
• Supramolecular Chemistry

Background:

• Living systems efficiently convert low-density energy into motion, a feat challenging for artificial systems due to high energy demands and complex controls.
• The Salmonella bacterium's dynamic ion-binding coordination inspires novel approaches for continuous motion in artificial systems.

Purpose of the Study:

• To introduce a novel concept of self-oscillating motors that harvest ambient energy using molecular-level dynamic bonding.
• To develop a coordination motorized oscillator (CoMO) capable of powering macroscopic, self-sustained behavior from trivial energy sources.
• To demonstrate the potential for creating ambient-driven robots with advanced locomotion capabilities.

Main Methods:

• Development of a novel supramolecular polydimethylsiloxane (PDMS) material for the coordination motorized oscillator (CoMO).
• Utilizing the material's significant thermo-inflation ability (25-fold normal PDMS, ~2000-fold passive layer) for energy harvesting.
• Employing reversible dissociation of coordination crosslinks triggered by ambient energy (e.g., body temperature) to generate macroscopic oscillation.

Main Results:

• The CoMO successfully harvests ambient energy, transforming molecular transitions into sustained macroscopic oscillation.
• Demonstrated amplification of macroscopic motion through the collective behavior of multiple CoMO units.
• Enabled the development of ambient-driven coordination motored robots (CoMbot) exhibiting multi-modal locomotion and terrain adaptability.

Conclusions:

• The developed CoMO principle offers a new paradigm for chemo-mechanical coupling in self-sustained systems.
• This approach paves the way for robust transition-mechanical transducing materials.
• Highlights potential for creating advanced soft machineries with unprecedented capabilities driven by ambient energy.