Large-Scale Nanofiber Manufacturing| Stretchable ThermoplasticPolyurethane/Boron Nitride NanosheetFabrics with Highly Anisotropic ThermalConductivityforMulti-scenario PassiveRadiative Cooling

Prof. Liu Chuntai at Zhengzhou University Adv. Fiber Mater. (IF 17.2): Stretchable Thermoplastic Polyurethane/Boron Nitride Nanosheet Textiles for Multi-Scenario Passive Radiative Cooling

Challenge:Passive radiative cooling textiles with high solar reflectance and mid-infrared emissivity show great promise for personal cooling applications. However, most current passive radiative cooling textiles neglect their intrinsic thermal conductivity, resulting in ineffective heat transfer from human skin to the environment.

Method: Prof. Liu Chuntai's team at Zhengzhou University prepared highly anisotropic thermally conductive thermoplastic polyurethane/boron nitride nanosheet (TPU/BNNS) textiles via one-step electrospinning, introducing conductive cooling mechanisms into passive radiative cooling textiles.

Innovation 1: This high anisotropy enables rapid in-plane heat transfer for heat dissipation while blocking external heat penetration through the thickness direction, achieving effective conductive cooling. Additionally, BNNS incorporation increases solar radiation scattering sites, further enhancing the textile's solar reflectance to 95%.

Innovation 2: Combined with the high emissivity (92.9%) provided by intrinsic groups of TPU and BNNS, the textile exhibits excellent radiative cooling capability. Through dual mechanisms of passive radiative cooling and conductive cooling, the TPU/BNNS textile achieves 12.4°C sub-ambient cooling and 10.7°C personal cooling.