Qinglong Hu,Ruiming Tan,Pengjie Zhong,Keyu Han,Yinyan Li,Peng Xue,Gongxun Bai
Passive daytime radiative cooling (PDRC) presents an effective strategy for mitigating the global greenhouse effect. However, some existing PDRC systems necessitate complex designs and are limited to selectively radiate heat into outer space. To improve the performance of PDRC systems, we have developed a multifunctional rare earth phosphor film that integrates particle scattering, fluorescence emission and broadband radiation capabilities. Outdoor tests conducted under an average solar radiation of 644 W m−2 indicated that the film achieved a sub-ambient cooling temperature of 8.26 °C with a net cooling power reaching up to 101 W m−2. During night tests, the SM film's average cooling was only 0.29 °C, which is promising for real-life nighttime comfort and building service life. Given its superior performance and multifunctionality, the composite film demonstrates significant potential for application in contemporary green development initiatives.
Multilayer materials attracted intense scientific interests in view of their special interlayer structure and potential application in diverse fields. Different from the conventional approach of layer-by-layer assembly, in this study we proposed an engineering approach of layer-by-layer curing from polydimethylsiloxane (PDMS) elastomer and rigid cellulose nanocrystals (CNC). The covalent-bonding from the crosslinking curing reaction as the driving force ensured the strong interlayers adhesion, and meanwhile the nanoreinforcing effect from silylated CNC in the composite layers provided the tailor-made physicochemical properties for the fabricated multilayer membranes. The multilayer structures indicating the good interlayers' adhesion and structural integrity of the di- and tri-layer membranes were observed from the microscopy characterization. In comparison with the monolayer PDMS membrane, the developed CPC trilayer membrane (possessing the sandwiched structure of two composite layers and one neat layer) exhibited the advancement on the storage modulus , special optical scattering and hazing, dielectric permittivity and barrier performance, derived from the nanoscaled reinforcing and obstruction effects of rod-like natural nanoparticles (Si CNC).
危险品化学品经营许可证（带存储）