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Giant magnetoelastic effect in soft systems for bioelectronics.

Yihao Zhou1, Xun Zhao1, Jing Xu1

  • 1Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, USA.

Nature Materials
|October 1, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a soft magnetoelastic composite with a giant magnetoelastic effect, four times greater than rigid materials. This breakthrough enables new wearable and implantable bioelectronic devices for power generation and sensing.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Physics

Background:

  • The magnetoelastic effect, crucial for bioelectronics, is typically found in rigid alloys.
  • The mechanical mismatch between rigid alloys and human tissues limits their biomedical applications.

Purpose of the Study:

  • To investigate a giant magnetoelastic effect in a soft composite material.
  • To develop stretchable and water-resistant magnetoelastic generators for bioelectronics.

Main Methods:

  • Fabrication of a soft composite with dispersed micromagnets in a silicone matrix.
  • Utilized a wavy chain model to interpret the magnetoelastic effect.
  • Integrated liquid-metal coils on polydimethylsiloxane for magnetic induction.

Main Results:

  • Observed a giant magnetoelastic effect in the soft composite, exceeding rigid counterparts by four times.
  • Demonstrated that mechanical stress alters micromagnet spacing and dipole alignment.
  • Developed conformable, stretchable, and water-resistant magnetoelastic generators.

Conclusions:

  • The soft magnetoelastic composite offers a promising platform for bioelectronic applications.
  • The developed generators are suitable for wearable or implantable power generation and biomedical sensing.
  • This research opens new avenues for human-body-centered electronic devices.