April 27, 2024

New progress in intelligent fiber research at Donghua University School of Materials

The clothes can be changed automatically according to the surrounding environment like chameleons. The insole can autonomously generate electricity by walking on the human body through walking. The curtains can adjust the shading capacity according to the strength of external light.... Research Institute of Material Science and Technology of Donghua University in Smart Fiber The research field has made new progress. These seemingly distant high-tech technologies are becoming more and more close to our lives as the fiber materials become increasingly functional and intelligent.

Smart fiber, in layman's terms, is the fiber that can actively perceive and respond to the external environment. The commonly used things like clothing, accessories, home textiles, etc., if they transform themselves into smart fibers, they may generate electricity, emit light, heat, and change color. In the State Key Laboratory for Modification of Fiber Materials at Donghua University, Prof. Wang Hongzhi's team has repeatedly experimented to achieve autonomous discoloration of the fibers in the energized environment.

As long as the low voltage stimulus of 2-3v is introduced, the fiber can achieve red, yellow, and blue color changes in milliseconds and can maintain color for half an hour. Even when twisted, knotted, and woven, the fiber can still change color. “This will not only help us realize our dream of being dressed in a neon dress, but it will also have great application value in military camouflage and other fields. We believe that in the future our soldiers will be able to freely transform themselves in deserts, jungles and oceans wearing uniforms. Professor Wang Hongzhi introduced.

How to make the energy supply of smart clothing more portable and use it longer? Researchers at the School of Materials at Donghua University want to start with the “roots” of fiber—to increase the electrical conductivity and electrical storage properties of the fiber while allowing it to have good weavability. They aim at graphene, which the industry has called “super materials” that can trigger new changes in materials science. Since 2009, they have organized research and development efforts.

The innovation team headed by Dean of the Materials Institute and Changjiang Scholar Professor Zhu Meifang has been making continuous efforts in high-value and intelligent research of general-purpose fibers. At present, wet spinning can be used to produce graphene fibers with a length of several kilometers. This kind of fiber not only has the highest conductivity of the same kind of product, but also has an internationally leading level of strength. It can be very easily woven into the desired fabric type and maintain the desired electrical conductivity and strength. The team has cooperated with relevant domestic and foreign research groups and successfully assembled graphene fibers into supercapacitors. Braiding these capacitors into fabrics will enable smart clothing to store and transmit electric energy at the same time.

In addition, the college has also made important breakthroughs in the development of "fibrous flexible solar cells." According to researcher Chen Zhigang of the institute, a fibrous flexible solar cell has been developed in the laboratory. "Importantly, in the future, fibrous solar cells can be used to weave fabrics, and clothes can convert solar energy into electricity by themselves." Chen Zhigang also frankly stated that due to the relatively high cost and the need for energy conversion efficiency to be improved, it will take time for these batteries to “fly into” the homes of ordinary people from the laboratory. “We will keep a close eye on this 'hard bone' and work tirelessly to do it. Go on." (Reporter Wu Shanyang)

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