According to a report by the Physicist Organization Network on July 3 (Beijing time), an international joint research team led by researchers at Northwestern University claimed that they have developed an electronic material that can be stretched like a rubber band. Even if this material is bent or stretched to 200% of its original size, it can work normally, and it has a wide range of applications in the fields of medical devices and consumer electronic device manufacturing.
For patients with heart disease, hypertension, diabetes, etc., going to the hospital regularly for physical examination is almost a part of life. This not only takes time and effort but also consumes a lot of medical resources. Scientists have long proposed that it is possible to design a miniature medical monitoring device that can be implanted into the human body. This is convenient for both the patient and the doctor, and can be discovered in a timely manner if any. However, the problem of materials has become a major obstacle to the development of the technology. Currently, most of the electronic components are based on silicon, and they are too rigid to perform this task.
The project leader is Huang Yonggang, a professor of environmental engineering and mechanical engineering at Northwestern University. In order to overcome this difficulty, he and his team have developed electronic components with an extension rate of up to 50% over the past five years, but they are still struggling before many valuable applications are needed. One of the challenges is the serious loss of conductivity caused by the extension. At present, circuits made of solid metal in the market are experiencing this difficulty without exception.
In the new study, Huang Yonggang team came up with a new method to solve this problem. First, they used a polymer called polydimethylsiloxane (PDMS) to create a porous, three-dimensional polymer that could be stretched to three times its original size. After that, the liquid metal (EGaIn) is poured into the pores of the polymer material so that the current will not be interrupted even if the high-strength material is stretched. With this method, they created materials that are both highly extensible and have excellent electrical conductivity.
Huang Yonggang said: “The key to this technology is the combination of porous polymer and liquid metal. By this method, we have successfully achieved a 200% extension of this material. With this material, we manufacture electrons that stretch like rubber bands. Equipment will be possible."
Also involved in this research are scientists from the Korea Advanced Institute of Science and Technology, Dalian University of Technology, China, and the University of Illinois at Urbana-Champaign. The related papers were published in Nature News, published on June 26th. (Reporter: Wang Xiaolong)
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