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Stretchable Electrets: Nanoparticle-Elastomer Composites.

Shuwen Zhang^1,2, Yecheng Wang¹, Xi Yao^1,3

¹John A. Paulson School of Engineering and Applied Sciences, Kavli Institute for Bionano Science and Technology, Harvard University, Cambridge, Massachusetts 02138, United States.

|May 16, 2020

Summary

This summary is machine-generated.

Researchers developed long-lived, stretchable electrets by embedding hard electret nanoparticles into a flexible dielectric elastomer. This composite material overcomes the traditional trade-off between electret longevity and stretchability, opening new application possibilities.

Keywords:

Elastomers Electrets Electromechanical transduction Nanoparticles Net charge

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Area of Science:

Materials Science
Polymer Science
Dielectric Materials

Background:

Electrets are dielectrics that store trapped charges or dipoles, crucial for applications like electrophotography and energy harvesting.
Traditional electrets prioritize charge longevity using hard dielectrics, limiting their flexibility.
Existing stretchable dielectrics often exhibit short charge retention, creating a conflict between longevity and stretchability.

Purpose of the Study:

To develop novel stretchable electrets that combine long-term charge storage with high elasticity.
To overcome the inherent limitations of conventional electret materials regarding flexibility and durability.

Main Methods:

A composite approach was employed, immobilizing nanoparticles of a hard electret material within a stretchable dielectric elastomer matrix.
Silica nanoparticles were dispersed in a polydimethylsiloxane elastomer to create the functional composite electret.

Main Results:

The developed composite electret demonstrated a charge density of approximately 4 × 10^-5 C m^-2.
The electret maintained its charge for over 60 days, exhibiting significant longevity.
The material successfully combined both stretchability and long-term charge retention.

Conclusions:

The composite design effectively separates the functions of charge trapping (longevity) and mechanical stretchability.
This approach significantly expands the range of materials available for creating high-performance, stretchable electrets.
The resulting long-lived, stretchable electrets present extensive opportunities for advanced technological applications.