The experimental double-sided fabric keeps the wearer warm in the cold and cool in the heat. The novelty is presented to the journal of the American Chemical Society.
An experimental double-sided fabric developed by scientists from China Zhejiang University and Westlake University can both warm and cool the wearer. Janus multilayer textiles consist of ePTFE (expanded polytetrafluoroethylene) polymer fibers. Nanoparticles are attached to them, due to which the fabric on one side warms the user, and on the other – remains cool.
Polytetrafluoroethylene (or simply PTFE) is a polymerization product of tetrafluoroethylene, better known in technical circles as “fluoroplastic”. PTFE was discovered in 1938, and now it is almost impossible to imagine some mechanisms without it. This chemically produced plastic is used in the automotive, chemical, and food industries, hydraulics and even medicine.
When worn with the warming side out, the zinc and copper nanoparticles on the garment absorb solar energy and reduce the amount of heat that goes away from the body. When the wearer turns the garment inside out, the porous coating of PMMA (polymethyl methacrylate) polymer on the now facing outward cooling side reflects sunlight and helps dissipate body heat.
Polymethyl methacrylate, or organic glass, is a synthetic vinyl polymer of methyl methacrylate, a thermoplastic transparent plastic known as plexiglass, acrima, novattro, plexime, limacryl, plascryl, acrylex, acrylite and others.
In tests carried out under natural sunlight, the heating side raised the temperature of the simulated leather more than black cotton. When the fabric was turned over, the cooling side reduced the temperature of the skin more than the white fabric.