Thousand-folded crane made of silk fibroin/calcium ion conductor film.
In science fiction movies or novels, in addition to having very good elasticity, the skin of future intelligent robots can automatically repair injuries. It can be flame-retardant when it is burned at high temperatures, and it can also transmit signals and connect with wireless terminals to implement early warning. This scenario may not be a dream in the future. Ling Shengjie, a professor at the School of Material Science and Technology at Shanghai University of Science and Technology, has successfully developed a new ionic skin material i-skin. The research results were recently published in the "Material Letter of the American Chemical Society".
"The organism transmits signals through ion transport." Ling Shengjie told the China Science Journal that the researchers used natural silk fibroin (SF) and calcium ions as raw materials to prepare a transparent and stretchable material through different synthesis strategies. , Self-repairing, high biosafety, flame retardant and conductive ionic skin material i-skin (SFCIS), and developed an alarm system that can transmit warning information through wireless signals under extreme conditions (fire).
The preparation method of SFCIS is simple and can be applied in large-scale production. SFCIS itself has high transparency and good flexibility. By adjusting the calcium ion content, the mechanical properties of SFCIS in different environments can be controlled. In a high-humidity environment, SFCIS has good adhesion and self-healing properties, and can also achieve good stretchability at different temperatures and humidity, with an elongation of up to 1200%, matching mechanical modulus and biological tissue modulus At the same time, the conductivity can reach 1.96 milli-Siemens per centimeter to meet the needs of wearable devices.
In order to explore the chemical reaction of materials during the combustion process, the researchers used the TGA-MS characterization method to analyze the changes in the material composition at different reaction stages. By comparing the maps of the pure silk protein system and the SFCIS system, it can be clearly drawn that after the addition of calcium ions, a series of flame retardant processes occurred in SFCIS. The researchers further explored the electrical behavior of SFCIS ion conductors under extreme conditions. When the flame burns, the resistance value of SFCIS will drop rapidly in the initial period, and maintain a long stable period, during which it can still conduct electricity. Based on this special nature, the research team designed and developed a fire alarm system that can transmit information wirelessly.
"This study used a simple method to prepare an ion conductor membrane based on natural silk protein, which has good electrical conductivity, adjustable mechanical properties, self-healing properties and flame retardancy." Ling Shengjie said that this achievement is to study such The combustion mechanism of the material provides a feasible solution, and also provides a new idea for the design of a new type of artificial skin based on ion conductors. (Reporter Huang Xin)
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