Stronger than spider silk: Bagworm silk enables strong conducting fibers

Stronger than Spider Silk: Bagworm Silk Enables Strong Conducting Fibers
Researchers at the University of Tsukuba have harnessed the strength of bagworm silk to produce a strong conductive fiber. To obtain this novel fiber, the research team combined bagworm silk with polyaniline as a conducting polymer. The composite fibers act as an optical waveguide and are suitable for use in textile transistors. This production of a bagworm silk/polyaniline composite will enable the use of biocompatible conducting fibers for applications ranging from microelectronics to biomedical engineering. Credit: University of Tsukuba

Think spider silk is strong? Recent work has shown that bagworm silk is superior to spider silk in both strength and flexibility. Building on these findings, a research team at the University of Tsukuba, led by Professor Hiromasa Goto, has harnessed the strength of bagworm silk to produce a strong, flexible, conductive fiber. This research may lead to new flexible electronic devices, such as wearable electronic materials.

Owing to its high flexibility and strength, has received much attention for uses ranging from medicine to aerospace applications. By combining natural silk, such as spider silk, with synthetic conductive polymers, researchers can produce textiles with conduction, light emission, and photovoltaic functions. It is also possible to create biocompatible materials that can be used in regenerative medicine and biomedical materials. "We've taken the next step from previous research efforts by utilizing the strongest known —bagworm silk," explains Professor Goto.

In this study, the research team combined polyaniline, a conducting polymer that can be easily synthesized, with bagworm silk obtained from a bagworm nest. The composite fibers obtained from the silk and polyaniline were 2 microns in diameter and acted as optical waveguides. The investigators demonstrated that green laser light propagates along these fibers, while remaining confined within each fiber. To determine the magnetic properties of the material, the investigators performed superconducting interference device (SQUID) measurements. The results revealed that the composite fibers can act as paramagnets: the fibers become magnetized when placed in an . By applying the bagworm silk/polyaniline composite in a field-effect transistor device, the research team also confirmed that the composite fiber is suitable for use in textile transistors.

As illustrated by this work, the strength of bagworm silk and the conductive properties of polyaniline can be combined, resulting in a new flexible material with desirable characteristics. "With the mass production of bagworm silk," says Professor Goto, "these fibers can be developed for various practical applications—for example, as electromagnetic inference shields, conductive textile wires, and anticorrosion textiles." This successful production of a strong conductive fiber comprised of bagworm and polyaniline will pave the path toward the application of these fibers in a variety of fields such as tissue engineering and microelectronics.  

The research was published in the Journal of Applied Polymer Science.

More information: Kyoka Komaba et al, Preparation of bagworm silk/polyaniline composite, Journal of Applied Polymer Science (2021). DOI: 10.1002/app.51791

Citation: Stronger than spider silk: Bagworm silk enables strong conducting fibers (2021, October 22) retrieved 27 November 2022 from https://phys.org/news/2021-10-stronger-spider-silk-bagworm-enables.html
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