Daytime Radiative Cooling Sheet Functionalized by Al2O3‐Assisted Organic Composite
Abstract Daytime radiative cooling presents a compelling technology, noted for its efficiency and environmental friendliness. Recent studies have focused on not only the cooling capacity but also the applicability and versatility of this technology. This study introduces a daytime radiative cooler a...
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| Format: | Article |
| Language: | English |
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Wiley
2025-03-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202417584 |
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| author | Jaein Park Dongwoo Chae Hangyu Lim Jisung Ha Seongwoo Park Hansang Sung Chanwoong Park Heon Lee |
| author_facet | Jaein Park Dongwoo Chae Hangyu Lim Jisung Ha Seongwoo Park Hansang Sung Chanwoong Park Heon Lee |
| author_sort | Jaein Park |
| collection | DOAJ |
| description | Abstract Daytime radiative cooling presents a compelling technology, noted for its efficiency and environmental friendliness. Recent studies have focused on not only the cooling capacity but also the applicability and versatility of this technology. This study introduces a daytime radiative cooler as a sheet with exceptional cooling performance. Its matrix is composed of polymethylmethacrylate (PMMA) and thermoplastic polyurethane (TPU), which are emerging organic materials suitable for radiative cooling. Furthermore, aluminum oxide (Al2O3) is employed as a supporting dielectric particle to enhance cooling performance. An Al2O3‐assisted organic composite (AOC) is created through electrospinning and hot‐pressing, resulting in a bendable sheet form. The AOC sheet demonstrates a light reflectance of 97.9% across the solar spectral region (0.3–2.5 µm) and an emissivity of 95.2% within the atmospheric transparency window (ATW) of 8–13 µm. The cooling power, derived from optical properties, is calculated to be 120.1 Wm−2. Experimental findings confirm the AOC sheet's capability to achieve 4.9 °C below ambient temperature and, when applied to a car model, to reduce the interior temperature by 12.7 °C. |
| format | Article |
| id | doaj-art-9dcdd1d4edea439a939ae0b0ba2288d1 |
| institution | OA Journals |
| issn | 2198-3844 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advanced Science |
| spelling | doaj-art-9dcdd1d4edea439a939ae0b0ba2288d12025-08-20T01:49:42ZengWileyAdvanced Science2198-38442025-03-011212n/an/a10.1002/advs.202417584Daytime Radiative Cooling Sheet Functionalized by Al2O3‐Assisted Organic CompositeJaein Park0Dongwoo Chae1Hangyu Lim2Jisung Ha3Seongwoo Park4Hansang Sung5Chanwoong Park6Heon Lee7Department of Materials Science and Engineering Korea University Anam‐ro 145 Seongbuk‐gu Seoul 02841 Republic of KoreaDepartment of Materials Science and Engineering Korea University Anam‐ro 145 Seongbuk‐gu Seoul 02841 Republic of KoreaDepartment of Materials Science and Engineering Korea University Anam‐ro 145 Seongbuk‐gu Seoul 02841 Republic of KoreaDepartment of Materials Science and Engineering Korea University Anam‐ro 145 Seongbuk‐gu Seoul 02841 Republic of KoreaDepartment of Materials Science and Engineering Korea University Anam‐ro 145 Seongbuk‐gu Seoul 02841 Republic of KoreaDepartment of Materials Science and Engineering Korea University Anam‐ro 145 Seongbuk‐gu Seoul 02841 Republic of KoreaDepartment of Materials Science and Engineering Korea University Anam‐ro 145 Seongbuk‐gu Seoul 02841 Republic of KoreaDepartment of Materials Science and Engineering Korea University Anam‐ro 145 Seongbuk‐gu Seoul 02841 Republic of KoreaAbstract Daytime radiative cooling presents a compelling technology, noted for its efficiency and environmental friendliness. Recent studies have focused on not only the cooling capacity but also the applicability and versatility of this technology. This study introduces a daytime radiative cooler as a sheet with exceptional cooling performance. Its matrix is composed of polymethylmethacrylate (PMMA) and thermoplastic polyurethane (TPU), which are emerging organic materials suitable for radiative cooling. Furthermore, aluminum oxide (Al2O3) is employed as a supporting dielectric particle to enhance cooling performance. An Al2O3‐assisted organic composite (AOC) is created through electrospinning and hot‐pressing, resulting in a bendable sheet form. The AOC sheet demonstrates a light reflectance of 97.9% across the solar spectral region (0.3–2.5 µm) and an emissivity of 95.2% within the atmospheric transparency window (ATW) of 8–13 µm. The cooling power, derived from optical properties, is calculated to be 120.1 Wm−2. Experimental findings confirm the AOC sheet's capability to achieve 4.9 °C below ambient temperature and, when applied to a car model, to reduce the interior temperature by 12.7 °C.https://doi.org/10.1002/advs.202417584atmospheric transparency windowdaytime radiative coolingelectrospinningmicrofiberssolar reflectance |
| spellingShingle | Jaein Park Dongwoo Chae Hangyu Lim Jisung Ha Seongwoo Park Hansang Sung Chanwoong Park Heon Lee Daytime Radiative Cooling Sheet Functionalized by Al2O3‐Assisted Organic Composite Advanced Science atmospheric transparency window daytime radiative cooling electrospinning microfibers solar reflectance |
| title | Daytime Radiative Cooling Sheet Functionalized by Al2O3‐Assisted Organic Composite |
| title_full | Daytime Radiative Cooling Sheet Functionalized by Al2O3‐Assisted Organic Composite |
| title_fullStr | Daytime Radiative Cooling Sheet Functionalized by Al2O3‐Assisted Organic Composite |
| title_full_unstemmed | Daytime Radiative Cooling Sheet Functionalized by Al2O3‐Assisted Organic Composite |
| title_short | Daytime Radiative Cooling Sheet Functionalized by Al2O3‐Assisted Organic Composite |
| title_sort | daytime radiative cooling sheet functionalized by al2o3 assisted organic composite |
| topic | atmospheric transparency window daytime radiative cooling electrospinning microfibers solar reflectance |
| url | https://doi.org/10.1002/advs.202417584 |
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