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Microfluidic Generation of Microsprings with Ionic Liquid Encapsulation for Flexible Electronics.

Yunru Yu1, Jiahui Guo1, Lingyu Sun1

  • 1State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.

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|September 25, 2019
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Summary

Researchers developed novel hollow microsprings using microfluidics and ionic liquid encapsulation. These flexible microsprings demonstrate excellent conductivity for advanced stretchable electronics and sensors.

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Area of Science:

  • Materials Science
  • Microfluidics
  • Flexible Electronics

Background:

  • Plant vascular systems exhibit helical structures for flexibility.
  • Existing flexible electronics often lack robust mechanical properties.

Purpose of the Study:

  • To develop novel microsprings inspired by plant structures.
  • To create microsprings with ionic liquid encapsulation for enhanced electronic properties.
  • To investigate their potential in flexible and stretchable electronic applications.

Main Methods:

  • Utilized a coaxial capillary microfluidic device for microspring fabrication.
  • Consecutively spun poly(vinylidene fluoride) (PVDF) and ionic liquid.
  • Controlled helical structures and core-shell morphology via microfluidic parameters.

Main Results:

  • Successfully fabricated hollow microsprings with in-situ ionic liquid encapsulation.
  • Achieved precise control over microspring structure (pitch, core-shell).
  • Demonstrated excellent conductive performance in flexible devices under tensile stress and cyclic motion.

Conclusions:

  • The developed microsprings offer a promising platform for flexible and stretchable electronics.
  • Ionic liquid encapsulation enhances the electromechanical properties of the microsprings.
  • Potential applications include stretchable sensors, electronic skins, and wearable devices.