June 25, 2024

A polymer film inspired by spider silk may connect biological tissues with electronic devices
Water-responsive shape-adaptive electrode array as implantable stimulation and recording electrodes.a, Schematic (top) and photograph (bottom) of a flexible WRAP-electrode array. b, Au film on dry polyacrylamide hydrogel and WRAP film. Wetting caused the contraction of WRAP-Au film and a slight increase in resistance. c, Optical microscope images of discontinuous Au domains on the isotropically swelled substrate (top) and continuous Au mesh on a PC-WRAP film (bottom). d, Impedance (solid plots) and phase angle (hollow plots) changes of the WRAP electrode under strain (20%, 40%). e, Voltage transients measuring Ema and Emc of WRAP electrode that should remain within the water electrolysis window (−0.6–0.8 V). f, Schematic showing that the implantation procedures of the WRAP electrodes are simpler and safer compared with those of the conventional electrodes. Credit: Nature (2023). DOI: 10.1038/s41586-023-06732-y

A team of materials scientists affiliated with several institutions in Singapore and China has developed a spider-silk-inspired polymer film that may be used to connect biological tissues with an electronic device. Their results are reported in the journal Nature. The editors at Nature have published a Research Briefing outlining the work in the same issue.

Scientists have been working to develop a material to connect biological tissue with an electronic device for quite some time—such a material would allow for that would not be rejected, for example, or connections of prosthetic limbs or devices to control organs, such as heart pacemakers. Most such efforts have fallen short, however, due to problems with stiffness and or the introduction of other safety issues.

One promising avenue of research has involved the study of soft, that could be applied to an organ, such as the heart, that would shrink-wrap upon application—similar to the way that plastics are used to shrink-wrap consumer products. Prior efforts have shown promise, but have suffered from firmness issues and a scarcity of materials that shrink when exposed to human body temperature or water. In this new effort, the research team has overcome these issues.

To create their film, the researchers looked to spider silk draglines, which shrink when exposed to or water. The team created a polymer with crystalline properties similar to silk draglines with an initial structure that remains in place until exposure to water—the water breaks down the , forcing the structure to contract.

The team named their product a water-responsive, shape-adaptive polymer (WRAP) film. Testing showed their films not only shrink but also conform to objects when stretched over them. The team next created electrodes for use with their WRAP by using electron-conductive metal layers with an insulating material covering them. They then applied the electrodes by encapsulating them using another insulation layer.

Thus far, the researchers have tested their film only in lab settings, but they are confident it will work well in the body, and once that is shown, products based on it should prove suitable for use in a wide variety of medical applications.

More information:
Junqi Yi et al, Water-responsive supercontractile polymer films for bioelectronic interfaces, Nature (2023). DOI: 10.1038/s41586-023-06732-y

Polymer films inspired by spider silk connect biological tissues and electronic devices, Nature (2023). DOI: 10.1038/d41586-023-03653-8

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Scientists develop a polymer film inspired by spider silk to connect biological tissues with electronic devices (2023, December 14)
retrieved 14 December 2023
from https://phys.org/news/2023-12-scientists-polymer-spider-silk-biological.html

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