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Related Experiment Video

Updated: Nov 17, 2025

Microfluidic Dry-spinning and Characterization of Regenerated Silk Fibroin Fibers
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Microfluidic Dry-spinning and Characterization of Regenerated Silk Fibroin Fibers

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Rapid Moisture-Responsive Silk Fibroin Actuators.

Ganesan Manikandan1,2, Aathira Murali3, Ravi Kumar2

  • 1Soft Materials Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India.

ACS Applied Materials & Interfaces
|February 12, 2021
PubMed
Summary

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Silk fibroin films actuate rapidly using moisture, demonstrating reversible, durable performance. These soft biopolymer actuators can lift significant weight and have potential applications in smart textiles and robotics.

Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Soft Robotics

Background:

  • Soft actuators are crucial for advanced robotics and wearable technology.
  • Biopolymers offer sustainable and biocompatible alternatives for actuator fabrication.
  • Silk fibroin, a protein from Bombyx mori silk, possesses unique mechanical and responsive properties.

Purpose of the Study:

  • To investigate the actuation characteristics of moisture-driven soft biopolymer films made from silk fibroin.
  • To evaluate the performance, durability, and potential applications of these novel silk-based actuators.

Main Methods:

  • Fabrication of Bombyx mori silk fibroin films using a facile solution-casting technique.
  • Characterization of actuation response to water vapor.
Keywords:
moisture responsivenesssilk fibroin filmsmart textilesoft actuatorsoft roboticsultrafast actuation

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  • Testing of durability through over a thousand continuous actuation cycles.
  • Demonstration of weight-lifting capabilities and prototype applications (intelligent textiles, autonomous crawler).

    • Main Results:

    • The silk films exhibit instantaneous, reversible actuation driven by moisture-induced stress gradients.
    • Subsecond response and actuation times were achieved.
    • Exceptional durability was confirmed with over a thousand cycles without fatigue.
    • The actuators demonstrated significant weight-lifting capacity (hundreds of milligrams lifted by microgram quantities of water).
    • Functional prototypes, including a moisture-responsive textile and an autonomous crawler, were successfully demonstrated.

    Conclusions:

    • Silk fibroin films present a promising platform for developing high-performance, durable, and moisture-responsive soft actuators.
    • The facile fabrication method allows for scalability and potential for widespread application in smart materials and devices.
    • These actuators offer a unique combination of responsiveness, strength, and biocompatibility for future innovations.