Prasanna Das, Sourav Rudra, Krishna Chand Maurya, Bivas Saha
{"title":"用于日间被动辐射冷却的超辐射氧化镁-PVDF 聚合物纳米复合涂料","authors":"Prasanna Das, Sourav Rudra, Krishna Chand Maurya, Bivas Saha","doi":"10.1002/admt.202301174","DOIUrl":null,"url":null,"abstract":"<p>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.</p>","PeriodicalId":7292,"journal":{"name":"Advanced Materials Technologies","volume":null,"pages":null},"PeriodicalIF":6.4000,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Ultra-Emissive MgO-PVDF Polymer Nanocomposite Paint for Passive Daytime Radiative Cooling\",\"authors\":\"Prasanna Das, Sourav Rudra, Krishna Chand Maurya, Bivas Saha\",\"doi\":\"10.1002/admt.202301174\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>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.</p>\",\"PeriodicalId\":7292,\"journal\":{\"name\":\"Advanced Materials Technologies\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":6.4000,\"publicationDate\":\"2023-09-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Advanced Materials Technologies\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/admt.202301174\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Materials Technologies","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/admt.202301174","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
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.
期刊介绍:
Advanced Materials Technologies Advanced Materials Technologies is the new home for all technology-related materials applications research, with particular focus on advanced device design, fabrication and integration, as well as new technologies based on novel materials. It bridges the gap between fundamental laboratory research and industry.