Superinsulating BNNS/PVA Composite Aerogels with High Solar Reflectance for Energy-Efficient Buildings

Jie Yang, Kit Ying Chan, Harun Venkatesan, Eunyoung Kim, Miracle Hope Adegun, Jeng Hun Lee, Xi Shen, Jang Kyo Kim

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

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.[Figure not available: see fulltext.]

Original languageBritish English
Article number54
JournalNano-Micro Letters
Volume14
Issue number1
DOIs
StatePublished - Dec 2022

Keywords

  • Boron nitride nanosheets
  • Energy-saving buildings
  • Solar reflectance
  • Solvent-assisted freeze-casting
  • Thermally insulating aerogel

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