Huazhong University of Science and Technology and other research and development of charcoal sponges for sensors

Light wood is moderately soft and can be used to make model airplanes and full-size wind turbine blades. Recently, a Sino-US joint research team has transformed the balsa wood into a "charcoal sponge" capable of withstanding repeated compression and other extreme mechanical conditions by combining its natural structure with chemical and physical properties, opening up the application of balsa wood. New Field. Related research results have been published on Chemistry.

The research team at Huazhong University of Science and Technology collaborated with the University of Maryland in the United States to destroy the hard hemicellulose and lignin fibers by using common chemicals, thereby obtaining a flexible sponge structure and maintaining the normal cell wall structure of balsa wood. It is then heated to 1000 ° C to turn the organic matter into carbon.

The researchers pointed out that ordinary carbonized wood has undergone only a heating step without any chemical modification. It is very fragile and can be crushed by appropriate external force. The charcoal sponge has undergone up to 10,000 consecutive "tempering" before deformation. ", its performance is very good.

The experimental results show that the hard and incompressible balsa wood can be chemically treated and carbonized to produce a charcoal sponge with mechanical compressibility, fatigue resistance and electrical response sensitivity over most compressible carbonaceous materials. Since the sponge is made entirely of natural wood, it is simple and cost-effective and therefore renewable and sustainable.

After further mechanical and electrical testing of the sponge, the researchers used it in the finger strain sensor prototype. This material can also be used in water purification devices, energy storage and communication technologies such as supercapacitors and rechargeable batteries.

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