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Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...

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Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets

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Soft strain-insensitive bioelectronics featuring brittle materials.

Yichao Zhao^1,2, Bo Wang³, Jiawei Tan^3,2

¹Interconnected and Integrated Bioelectronics Lab (I²BL), Department of Electrical and Computer Engineering, Samueli School of Engineering, University of California, Los Angeles, CA, USA.

Science (New York, N.Y.)

|December 15, 2022

Summary

This summary is machine-generated.

Researchers developed new stretchable bioelectrodes that maintain stable electrochemical performance despite mechanical strain. These advanced materials enable reliable tissue sensing and neuromodulation for improved medical electronics.

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A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials

A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials

Published on: May 18, 2015

Area of Science:

Biomedical Engineering
Materials Science
Neuroscience

Background:

Current bioelectronic devices face challenges in simultaneously meeting electrochemical, electrical, and mechanical requirements for tissue interaction.
Existing rigid clinical bioelectrodes are mechanically incompatible with soft tissues.
Stretchable conductive materials often suffer from performance degradation due to strain and corrosion during electrochemical tissue probing.

Purpose of the Study:

To design and develop novel bioelectrodes that overcome the limitations of current technologies.
To create stretchable, conductive, and strain-insensitive bioelectrodes for reliable electrochemical sensing and neuromodulation.
To maintain the electrochemical functionality of clinically relevant interfacial materials under mechanical strain.

Main Methods:

A layered architectural composite design was employed, integrating strain-induced cracked films with strain-isolated conductive pathways.
In-plane nanowire networks were utilized to mitigate strain effects on electrochemical performance.
A library of bioelectrodes using iridium-oxide, gold, platinum, and carbon was fabricated and tested with amperometry, voltammetry, and potentiometry.

Main Results:

Developed stretchable, highly conductive, and strain-insensitive bioelectrodes.
Demonstrated elimination of strain effects on device electrochemical performance.
Achieved strain-insensitive sensing of multiple biomarkers and successful in vivo neuromodulation.

Conclusions:

The novel layered composite design effectively decouples mechanical strain from electrochemical functionality.
The developed bioelectrodes offer a promising platform for advanced, reliable tissue-interfacing electronic devices.
These strain-insensitive bioelectrodes pave the way for next-generation implantable and wearable medical technologies.