期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 12, 页码 14550-14560出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c25037
关键词
polymer photonic crystals; thermal shielding; solar irradiation; heating; near infrared; dielectric mirror; sustainability
资金
- University of Genoa [3384]
- European Union [FRA2019, FRA2020]
Preventing solar heating is crucial for energy savings and health preservation. The use of polymer dielectric mirrors can effectively reduce and control the light absorbed by materials, playing a significant role in energy saving and health preservation.
Preventing solar heating is nowadays of paramount interest in energy savings and health preservation. For instance, in building thermalization solar heating consumes an excess of energy leading to harmful CO2 emissions, while in food and beverage packaging it may lead to variation of organoleptic properties or even health issues. The phenomenon is attributed to the large presence of moieties with highly absorbing vibrational overtones and combination bands in the near-infrared spectral region that induces heating in water, moisture, and in polymers used in packaging. Thus, reducing and controlling the light absorbed by these materials with effective low-cost passive systems can play a major role in energy saving and health preservation. In this work, different polymer dielectric mirrors are reported, made of poly(N-vinylcarbazole) and either cellulose acetate or poly(acrylic acid), and able to selectively reflect near-infrared radiation while maintaining high transparency in the visible range. To this end, simple, tandem, and superperiodic mirrors are used to shield radiation impinging on samples of water and paraffin, demonstrating shielding efficiencies up to 52% with respect to unshielded references, promising a new paradigm to solve thermal management issues.
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