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Only a thin coating of 1μm can realize all-weather human precision heating

Time : 2021-07-26 Hits : 11

Normally, the body loses about 50 percent of its heat by radiating out mid-infrared rays. To reduce infrared radiation loss, an effective strategy is to regulate the mid-infrared emissivity of textile and clothing, so as to realize passive radiation heating (PRH) of human body. Compared with traditional heating strategies, PRH has the advantages of no energy consumption, more accurate and efficient. However, PRH's maximum thermal insulation ability is limited in outdoor environment, especially in the case of day and night and weather changes greatly, it is difficult to achieve accurate heating of the human body. Therefore, the development of materials and systems that can accurately heat the human body in an energy-efficient manner, all day long, is essential to mitigate the energy crisis and global warming.


To solve these problems, the Zhengzhou University research team reported an energy-efficient all-weather personal precision heating strategy: Three heating modes, namely PRH without energy consumption, energy saving solar heating and compensative Joule heating, were successfully integrated into wearable Mxene /nanoPE textile (12 μm) system by coating thin Ti3C2Tx Mxene coating (1 μm) on inexpensive nanopore polyethylene (nanoPE) textile.

In the preparation process, the researchers first polymerized a layer of polydopamine (PDA) on the surface of nanoPE fabric in situ to form a hydrophilic surface. The PDA-modified nanoPE fabric is then simply coated with MXene solution to produce MXene/ nanoPE textiles. The method is simple, feasible and suitable for large-scale preparation of MXene/nanoPE textiles.


Schematic diagram of human skin heat transfer covered with traditional textiles and MXene/nanoPE textiles and preparation process and characterization of MXene/nanoPE textiles

MXene/nanoPE textiles not only have excellent indoor PRH properties, but also exhibit excellent active solar heating (73.5℃) and joule heating (55℃, 5V) capabilities thanks to MXene's low mid-infrared emissionability, high photothermal conversion efficiency and electrical conductivity. Moreover, the three heating modes can be easily switched or combined, enabling MXene/nanoPE textiles to accurately heat the human body all day in a variety of scenarios.

In addition, the obtained MXene/nanoPE textiles also show excellent wearable and wear resistance properties, including mechanical strength, air permeability, wind resistance, flame retardant, electromagnetic interference shielding, antibacterial properties, fast drying properties, etc., making them ideal candidate materials and systems for precise thermal management of human body in the future.


Wearable performance of MXene/nanPE textiles

Ti3C2Tx Mxene-decorated Nanoporous Polyethylene for Passive and Active Personal Precision Heating It was published in ACS Nano.

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