Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201907562
Keywords
electrospinning; flexible membranes; photonic structures; radiative cooling
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Funding
- Foundation for National Natural Science Foundation of China [51425203, 51772191]
- Natural Science Foundation of Shanghai [17ZR1441100]
- Key Project of Intergovernmental International Scientific and Technological Innovation Cooperation [2017YFE0127100]
- Top Young Talents of Ten Thousand Talents Plan
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Passive radiative cooling technology can cool down an object by reflecting solar light and radiating heat simultaneously. However, photonic radiators generally require stringent and nanoscale-precision fabrication, which greatly restricts mass production and renders them less attractive for large-area applications. A simple, inexpensive, and scalable electrospinning method is demonstrated for fabricating a high-performance flexible hybrid membrane radiator (FHMR) that consists of polyvinylidene fluoride/tetraethyl orthosilicate fibers with numerous nanopores inside and SiO2 microspheres randomly distributed across its surface. Even without silver back-coating, a 300 mu m thick FHMR has an average infrared emissivity >0.96 and reflects approximate to 97% of solar irradiance. Moreover, it exhibits great flexibility and superior strength. The daytime cooling performance this device is experimentally demonstrated with an average radiative cooling power of 61 W m(-2) and a temperature decrease up to 6 degrees C under a peak solar intensity of 1000 W m(-2). This performance is comparable to those of state-of-the-art devices.
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