Smart garments warming in the cold andcooling in the heat are not new on the market. However, all existing smart clothing models require external energy sources. Scientists are working on creating innovative textiles with unique physical properties that allow the use of the internal energy of the material to regulate the heat transfer of the user.
Researchers from china university of science andHuazhong technology developed a fabric based on yarn from silk and chitosan, found in the shells of crustaceans. As a result, fibers with a microstructure are formed, the pores of which are filled with an artificial material - polyethylene glycol (PEG). The PEG material is able to change the state of aggregation with slight temperature fluctuations - to harden in cold weather and to melt in heat.
Outside, textile fibers are coated with organicpolymer - polydimethylsiloxane, creating an airtight shell that does not allow the molten PEG to flow out. The created composite water-repellent material is presented in the form of threads of high strength and flexibility.
During testing gloves from innovativetissues were first placed in a chamber with air heated to a temperature of 50 degrees Celsius. As a result of the transition to a liquid state, the tissue elements absorbed energy from the environment and cooled the surface in contact with the hands. Changing the regime and lowering the temperature to 10 degrees Celsius led to hardening of the substance and the release of energy, which, in turn, contributed to the heating of the outer layer of gloves in contact with hands.
According to the developers, the production of such a fabric, called "phase", should not cause difficulties for the modern textile industry.