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Just like our Mums always said….

Silver nano wire

…turn the heating down and put another jumper on, except that now that extra jumper might be dip-coated in a silver nanowire solution that makes the fabric highly radiation insulating. It could even reflect back over 90% of a user’s body heat whereas the average item of clothing reflects around 20%. At the Yi Cui lab at Stanford University fabrics have been created that have silver nanowires embedded in them to reflect human body infrared radiation while maintaining the original breathability of the fabric. This doesn’t get around the problem of persuading someone to put a jumper on in the first place though….

Website link: Personal Thermal Management by Metallic Nanowire-Coated Textile, Nano Letters, 2014