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Soft Elastomers with Ionic Liquid-Filled Cavities as Strain Isolating Substrates for Wearable Electronics.

Yinji Ma1, Matt Pharr2, Liang Wang3

  • 1Department of Civil and Environmental Engineering, Mechanical Engineering, and Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA, Department of Engineering Mechanics, Center for Mechanics and Materials, Tsinghua University, Beijing 100084, China.

Small (Weinheim an Der Bergstrasse, Germany)
|December 28, 2016
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Summary

This study introduces ionic liquids within microfluidic channels for wearable electronics, enhancing stretchability and preventing leakage. This innovation improves the mechanical compatibility between electronic components and soft biological tissues.

Keywords:
flexible electronicsionic liquidstretchable electronicswearable electronics

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Electronics

Background:

  • Mechanical mismatch between rigid electronics and soft tissues hinders wearable device development.
  • Existing strain-isolation methods using liquids face challenges with vapor pressure and permeability.

Purpose of the Study:

  • To develop a novel strain-isolation system for wearable electronics using ionic liquids.
  • To enhance wearability and stretchability of electronic devices by addressing mechanical mismatch.
  • To prevent liquid leakage and evaporation in microfluidic wearable systems.

Main Methods:

  • Utilized ionic liquids instead of traditional liquids to eliminate leakage and evaporation.
  • Integrated liquid within an enclosed, elastomeric microfluidic space, isolated from active electronic components.
  • Combined experimental and theoretical analyses to understand strain-isolation effects and cavity collapse.

Main Results:

  • Demonstrated effective strain-isolation by positioning ionic liquid between electronics and skin.
  • Eliminated leakage and evaporation issues associated with traditional liquids.
  • Identified key factors influencing the mechanical stability of the fluid-filled microfluidic cavity.

Conclusions:

  • Ionic liquid-based microfluidic systems offer a robust solution for mechanical mismatch in wearable electronics.
  • This approach significantly enhances device wearability, stretchability, and long-term reliability.
  • Successfully applied the technology in skin-mounted wireless temperature sensors and wired mechano-acoustic sensors.