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Lamprey-Inspired Amphibious Suction Disc with Hybrid Adhesion Mechanism.

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Researchers developed a novel hybrid suction disc inspired by lampreys. This bioinspired adhesive uses a shape-memory polymer and vacuum suction for robust, reversible adhesion on diverse surfaces, both in air and underwater.

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Area of Science:

  • Robotics and Materials Science
  • Bioinspired Engineering
  • Adhesion Science

Background:

  • Existing robotic grippers often rely on single adhesion mechanisms, limiting adaptability to varied surfaces and environments.
  • Developing robust, reversible, and cross-medium adhesion is crucial for advanced robotic manipulation.

Purpose of the Study:

  • To create a hybrid suction disc inspired by the lamprey oral sucker for enhanced robotic adhesion.
  • To integrate a thermally switchable shape-memory polymer (SMP) with vacuum suction for adaptive gripping.

Main Methods:

  • Designed a hybrid disc combining a shape-memory polymer (SMP) for surface conformity and a silicone lip for vacuum suction.
  • Investigated adhesion performance in air and underwater on smooth and rough surfaces.
  • Evaluated shear friction and long-term adhesion stability.

Main Results:

  • The hybrid disc achieved high pull-off forces (562 N in air, 590 N underwater), exceeding 850 times its weight.
  • Adhesion improved significantly with SMP integration (377% in air, 270% underwater) compared to vacuum alone.
  • Demonstrated robust adhesion on rough surfaces and secure attachment for over 26 hours.

Conclusions:

  • The lamprey-inspired hybrid suction disc offers superior, adaptable, and reversible adhesion across diverse conditions.
  • This technology enables advanced robotic gripping and manipulation, particularly for amphibious applications.
  • Paves the way for multimodal adhesion systems and amphibious robots.