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http://hdl.handle.net/10397/94291
Title: | Superinsulating BNNS/PVA composite aerogels with high solar reflectance for energy-efficient buildings | Authors: | Yang, J Chan, KY Venkatesan, H Kim, E Adegun, MH Lee, JH Shen, X Kim, JK |
Issue Date: | Dec-2022 | Source: | Nano-micro letters, Dec. 2022, v. 14, no. 1, 54 | Abstract: | With the mandate of worldwide carbon neutralization, pursuing comfortable living environment while consuming less energy is an enticing and unavoidable choice. Novel composite aerogels with super thermal insulation and high sunlight reflection are developed for energy-efficient buildings. A solvent-assisted freeze-casting strategy is used to produce boron nitride nanosheet/polyvinyl alcohol (BNNS/PVA) composite aerogels with a tailored alignment channel structure. The effects of acetone and BNNS fillers on microstructures and multifunctional properties of aerogels are investigated. The acetone in the PVA suspension enlarges the cell walls to suppress the shrinkage, giving rise to a lower density and a higher porosity, accompanied with much diminished heat conduction throughout the whole product. The addition of BNNS fillers creates whiskers in place of disconnected transverse ligaments between adjacent cell walls, further ameliorating the thermal insulation transverse to the cell wall direction. The resultant BNNS/PVA aerogel delivers an ultralow thermal conductivity of 23.5 mW m−1 K−1 in the transverse direction. The superinsulating aerogel presents both an infrared stealthy capability and a high solar reflectance of 93.8% over the whole sunlight wavelength, far outperforming commercial expanded polystyrene foams with reflective coatings. The anisotropic BNNS/PVA composite aerogel presents great potential for application in energy-saving buildings. | Keywords: | Boron nitride nanosheets Energy-saving buildings Solar reflectance Solvent-assisted freeze-casting Thermally insulating aerogel |
Publisher: | Springer | Journal: | Nano-micro letters | ISSN: | 2311-6706 | EISSN: | 2150-5551 | DOI: | 10.1007/s40820-022-00797-6 | Rights: | © The Author(s) 2022 This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The following publication Yang, J., Chan, K. Y., Venkatesan, H., Kim, E., Adegun, M. H., Lee, J. H., ... & Kim, J. K. (2022). Superinsulating BNNS/PVA Composite Aerogels with High Solar Reflectance for Energy-Efficient Buildings. Nano-micro letters, 14(1), 54 is available at https://doi.org/10.1007/s40820-022-00797-6 |
Appears in Collections: | Journal/Magazine Article |
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Yang_Superinsulating_Composite_Aerogels.pdf | 2.54 MB | Adobe PDF | View/Open |
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