Researchers from Donghua University (China) have developed synthetic fabric to actively cool the body without using energy sources. It's all about the chemical properties of new materials, the combination of which allows you to achieve a complex effect - and impressive performance. The new tissue does not block the body's natural functions - on the contrary, it helps it to more easily get rid of excess heat and moisture.
It is based on an old and proven durable polyurethane. To this is added a layer of fluorinated polyurethane with strong hydrophobic properties. The third layer is made of boron nitride and has excellent heat transfer characteristics. All three materials are combined into nanometer-diameter fibers, from which a fabric with large meshes is woven.
When the human body warms up and begins to sweat, sweat is released through the pores. At the same time, boron nitride removes heat so efficiently that the surface of the fabric heats up more than a degree higher than the body itself. This heat heats the air and creates a steady air flow from the surface of the body to the outside, which accelerates the evaporation of sweat. Any liquid trapped outside is repelled by the fluorinated polyurethane and drips off the fabric, leaving it dry.
To demonstrate the outstanding qualities of the fabric, the developers placed it as a bridge in a vessel where water was poured on top and air remained below. The force of water pressure was not enough for it to seep through the fabric even in the form of drops, and when the compressor was turned on, the air from below began to pierce through the fabric and penetrate into the water in the form of bubbles. The fabric developers say that in addition to solving cooling problems, the new material can also serve as the basis for filtration systems.