The elegance of simplicity: a cost-effective Janus membrane for all-day radiative thermal management inspired by complementary photothermal design

A MXene/Nylon66 Janus membrane enables bidirectional thermal regulation via flipping: subambient cooling (−14.8 °C) and solar heating (+36.4 °C). Its simple, low-cost fabrication offers strong potential for scalable use in space and buildings.