(Reporter Li Zhe) If there is a piece of smart clothes, you can sense the surface moisture of the skin. When sweating, the long sleeves become short sleeves, and when the sweat is dry, it will be as original as it is. Today, this vision has become possible. Professor Liu Zunfeng from the State Key Laboratory of Medicinal Chemistry Biology of Nankai University has developed a green and pure silk “artificial muscle” that can automatically expand and contract by sensing humidity. This new "artificial muscle" can be applied to soft robots to develop and manufacture smart fabrics. A few days ago, the paper introducing the results was published in the international authoritative journal “Advanced Functional Materials” in the field of materials.

The Liu Zunfeng team used natural silk to prepare a new type of “artificial muscle” fiber through conventional industrial processes such as degumming, twisting, plying, and heat setting, which can be twisted, stretched and shrunk driven by water mist and humidity. The team of Liu Zunfeng developed a torque-balanced fiber structure that folds and plies the twisted fibers to achieve self-balancing of the silk fibers, enabling reversible driving without external fixation. When exposed to water mist, the artificial muscle fibers are twisted to achieve a fully reversible torsional stroke. When the relative humidity was changed from 20% to 80%, the contraction rate of the silk stretch muscle was 70%. "This excellent actuability is due to the loss of intracellular hydrogen bonds induced by silk fibers and the associated structural transformation, and is confirmed by molecular dynamics simulation, X-ray diffraction and macroscopic characterization." Liu Zunfeng said.

The reporter saw in the laboratory that the researchers used a silk-stretching muscle to weave a doll-sized smart top. When the ambient humidity increased, the sleeve length of the smart top was shrunk to half the original length; when the humidity dropped, it returned to its original state. This moisture-sensitive textile can effectively achieve moisture and heat management functions by changing macroscopic shapes.

Source: Health News

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