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Scalable Film Based on Thermochromic and Radiative Cooling Effects for Anti-Counterfeiting and Low Temperature Preservation

Bo Xiang,Luyao Xu,Yufei Li,Liyuan Jiao,Rong Zhang

Thermochromism and radiative cooling have received extensive attention as two popular research areas in recent years. However, how to effectively combine the two remains a challenge. Herein, we present a well-designed polymethylpentene (TPX)/silicon dioxide (SiO2)/thermochromic microcapsule (TSTM) hybrid film, which effectively integrates both thermochromic and radiative cooling capabilities. Notably, the thermochromic capability gives the TSTM film excellent anticounterfeiting performance by inducing a temperature-dependent change in solar transmittance. Furthermore, the TSTM film exhibits a high average infrared emittance (ˉεIR${\overline{\epsilon }}_{\mathrm{IR}}$) value of ∼94% at low temperatures and achieves a cooling effect exceeding 5C under a solar intensity (Isolar) of ∼900 W m–2, indicating an excellent radiative cooling property and potential for effective low-temperature preservation under sunlit conditions. Additionally, the TSTM film demonstrates outstanding durability, while a simple and straightforward fabrication process allows for large-scale production. Such a scalable, durable, and dual-functional hybrid film demonstrates an innovative and effective design, holding promise for expanding its application in the fields of anticounterfeiting and low temperature preservation.