用于被动日间辐射冷却的超发射 MgO-PVDF 聚合物纳米复合涂料,Advanced Materials Technologies

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用于被动日间辐射冷却的超发射 MgO-PVDF 聚合物纳米复合涂料
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2023-09-29 , DOI: 10.1002/admt.202301174
Prasanna Das _{1,

2,

3} , Sourav Rudra _{1,

2,

3} , Krishna Chand Maurya _{1,

2,

3} , Bivas Saha _{1,

2,

3}

Affiliation

被动式日间辐射冷却 (PDRC) 具有巨大的潜力，可以在炎热环境中提供低成本、无电冷却，并克服城市热岛效应。传统的辐射冷却装置由复杂的多层结构和反射背金属板组成，不适合家庭应用。大多数单层聚合物纳米复合材料由于成本高、脆弱且热发射率低而导致冷却性能欠佳，因此在实际中并不适用。在此，研究表明，超白、超发射氧化镁 (MgO)-聚偏二氟乙烯 (PVDF) 纳米复合材料在阳光直射下的平均温度比低于环境温度降低约 7°C。优化后的介电粒子尺寸约为 50 nm 的 MgO-PVDF 超材料由于米氏散射而表现出高达 96.3% 的太阳反射率，并且由于非谐多声子 Mg 而在大气传输窗口处表现出 98.5% 的创纪录高热发射率─ O 键振动，以及聚合物的其他拉伸/键合振动。该纳米复合涂料表现出耐水疏水性能，可以轻松涂覆在铺路材料、木棒等上，且均匀度高、附着力好。这项工作为摊铺机、瓷砖和建筑冷却应用提供了一种低成本、可扩展、溶液加工的纳米复合涂层，具有优异的冷却性能，特别是在赤道地区、东南亚、中东和非洲地区。

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Ultra-Emissive MgO-PVDF Polymer Nanocomposite Paint for Passive Daytime Radiative Cooling

Passive daytime radiative cooling (PDRC) holds enormous potential to provide low-cost, electricity-free cooling in hot environments and to overcome the urban heat island effects. Conventional radiative cooling devices consist of complicated multilayer structure, and reflective back metallic plates that are unsuitable for household applications. Most single-layer polymer nanocomposites are also not practically applicable due to their high cost, frailty, and sub-optimum cooling performances arising from low thermal emissivity. Herein, it is shown that ultra-white and ultra-emissive magnesium oxide (MgO)-polyvinylidene fluoride (PVDF) nanocomposite that exhibits an average ≈7°C temperature decrease below the sub-ambient conditions under direct sunlight. The optimized MgO-PVDF metamaterials with a dielectric particle size of ≈50 nm exhibit a large solar reflectance of 96.3% due to the Mie-scattering and a record high thermal emission of 98.5% at the atmospheric transmission window due to the anharmonic multiphonon Mg─O bond vibrations, and other stretching/bonding vibrations from the polymer. The nanocomposite paint exhibits water-resistant hydrophobic properties and can be easily coated on pavers, wood sticks, etc., with high uniformity and good adhesion. This work provides a low-cost, scalable, and solution-processed nanocomposite coating with excellent cooling performance for pavers, tiles, and building cooling applications, especially in equatorial regions, southeast Asia, middle-east, and African regions.

更新日期：2023-09-29

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