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Dual-Mode Porous Polymeric Films with Coral-like Hierarchical Structure for All-Day Radiative Cooling and Heating
Mengke Shi1, Zifan Song1, Jiahao Ni1
1College of Materials Science and Engineering, Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou450001, China.
ACS Nano
|January 13, 2023
Summary
This study presents a novel dual-mode film for passive radiative cooling and heating. The innovative material offers adaptable, all-day temperature regulation, crucial for sustainable energy solutions.
Area of Science:
- Materials Science
- Sustainable Energy
- Nanotechnology
Background:
- Passive radiative cooling (PRC) and passive radiative heating (PRH) are sustainable thermal management strategies.
- Current PRC/PRH materials lack adaptability to changing environmental conditions.
Purpose of the Study:
- To develop an all-day, dual-mode film for both passive radiative cooling and heating.
- To create a material that can dynamically adapt to seasonal and weather variations.
Main Methods:
- Fabrication of a dual-mode film by decorating MXene nanosheets onto porous poly(vinylidene fluoride) with coral-like hierarchical structures via phase inversion.
- Characterization of optical properties including solar reflectivity, infrared emissivity, and solar absorptivity.
Main Results:
- The cooling side achieved 9.8 °C daytime and 11.7 °C nighttime subambient cooling with high solar reflectivity (96.7%) and infrared emissivity (96.1%).
- The heating side demonstrated 8.1 °C PRH capability with low infrared emissivity (11.6%) and high solar absorptivity (75.7%).
- The film can be easily flipped to switch between cooling and heating modes.
Conclusions:
- The developed dual-mode film offers a versatile solution for dynamic thermal management.
- This technology contributes to alleviating the energy crisis and reducing greenhouse gas emissions through sustainable heating and cooling.
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