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Tactile Sensing Using Magnetic Foam.

Gildas Diguet^1,2, Joerg Froemel^1,2, Masanori Muroyama^1,3,4

¹Division for the Establishment of Frontier Sciences, Organization for Advanced Studies, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.

|February 26, 2022

Summary

Researchers developed a soft, biocompatible magnetic polymer composite sensor. This smart material detects and locates deformations by sensing changes in its magnetic properties when compressed up to 50%.

Keywords:

artificial skin deformation sensors magnetic composite

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Area of Science:

Materials Science
Biomedical Engineering
Polymer Science

Background:

Smart materials for biomedical applications require biocompatibility and softness.
Smart polymers are promising candidates due to their inherent properties.
Developing effective sensors for detecting deformation is crucial in biomedical fields.

Purpose of the Study:

To create a novel soft, biocompatible magnetic polymer composite for sensing applications.
To investigate the relationship between compression and magnetic property changes in the composite.
To demonstrate the sensor's capability in detecting and localizing applied deformation.

Main Methods:

Fabrication of a foam-based polymer composite incorporating magnetic particles.
Characterization of the composite's mechanical properties, including a small Poisson's ratio enabling up to 50% compression.
Utilizing a 3x3 array of sensing coils to detect alterations in magnetic properties induced by deformation.

Main Results:

The developed composite exhibited significant compressibility (up to 50%).
Compression induced detectable changes in the material's magnetic properties.
The 3x3 sensor array successfully detected and localized applied deformation.

Conclusions:

The magnetic polymer composite demonstrates potential as a soft, biocompatible sensor for biomedical applications.
The sensor's ability to detect and localize deformation through magnetic property changes is validated.
This material offers a promising approach for advanced soft robotics and medical device development.