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Coconut pollen paper soft actuator: tunable shape morphism driven by vapor.

Sarah Ahmad Siraj1,2, Vipin Kumar1,2, Akash Patil3,2

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This study presents a novel soft actuator made from coconut pollen that changes shape in response to water and alcohol vapors. This eco-friendly material offers potential for responsive and adaptive systems.

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Area of Science:

  • Materials Science
  • Soft Robotics
  • Biomaterials

Background:

  • Developing sustainable materials for energy conversion is critical.
  • Pollen grains offer a durable, eco-friendly, and abundant resource.
  • Soft actuators responding to environmental stimuli are key for new technologies.

Purpose of the Study:

  • To create a flexible, multi-vapor-responsive soft actuator using pollen.
  • To investigate shape morphing triggered by water and alcohol vapor evaporation.
  • To explore methods for controlling actuator bending direction and behavior.

Main Methods:

  • Fabrication of a paper-like soft actuator from *Cocos nucifera* pollen grains.
  • Utilizing natural evaporation of water and alcohol vapors as stimuli.
  • Employing surface structuring techniques to control bending direction.
  • Conducting finite element analysis to understand mechanical responses.
  • Assessing mechanical integrity under prolonged water vapor exposure.

Main Results:

  • The pollen actuator exhibits reversible shape changes (smiley/sad faces) based on vapor type.
  • Actuator geometry and ambient humidity influence shape morphing.
  • Surface corrugations effectively control the direction of bending.
  • The material demonstrates good mechanical integrity with water vapor.

Conclusions:

  • Coconut pollen can be engineered into responsive soft actuators.
  • Environmental stimuli and structural design are crucial for actuator performance.
  • This work demonstrates potential for pollen-based materials in adaptive systems.