Researchers at Donghua University have developed a new type of fabric, which they claim can cool the wearer. This material is made of several different polymers in a relatively simple way, which can effectively transfer heat and absorb sweat, while still being waterproof from the outside. The material is mainly composed of three parts: polyurethane constituting the basic structure, waterproof fluorinated polyurethane and thermally conductive boron nitride nanosheets. The three are combined and run through an electrospinning instrument to form a nano-fiber membrane.
The resulting film takes the form of polymer nanofibers coated with boron nitride, giving the material three-component characteristics. Boron nitride helps to transfer the heat of the human body to the outside; the large pores between the fibers allow air to circulate to the skin, while helping to evaporate and discharge water; despite the large pores, due to the effect of fluorine-containing polyurethane, the material outside Still waterproof.
The team conducted multiple tests to prove the capabilities of the material. In one of the tests, they stretched a sample between two rooms-one room was filled with air underneath, and one room was filled with water. This material prevents water from soaking and dripping into the lower room, while allowing the air below to pass through and emerge from the water.
In another test, the team placed a sample of the material on a small heater, which simulates the heat of the human body, and then they measured the amount of heat it transfers over time and compared it with another A sample of a material without boron nitride was compared. Then, they measured how much heat it transferred over time and compared it with another sample of material that did not contain boron nitride. The heat conduction efficiency of the new material is higher-after 40 seconds, its surface temperature is about 1.2°C higher than that of the other material.
This may not be the smartest cooling material, but the team says it is relatively easy to produce. In addition to clothes used to help the wearer cool down, the team said that this new material can also be used to cool electronic products and improve equipment that collects solar energy or desalinates seawater.
The research was published in the journal ACS Applied Materials and Interface. The team describes this work in the video below.
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