Anisotropic thermally superinsulating boron nitride composite aerogel for building thermal management

Miracle Hope Adegun, Kit Ying Chan, Jie Yang, Harun Venkatesan, Eunyoung Kim, Heng Zhang, Xi Shen, Jinglei Yang, Jang Kyo Kim

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

Thermally insulating materials are commonly used to reduce energy consumption in buildings. Most commercial products possess only low thermal conductivities but poor insulating capabilities in the daytime with little sunlight reflectance and thermal emittance. It is challenging to achieve all traits in the same material. Herein, anisotropic boron nitride nanosheet (BNNS)/polyvinyl alcohol composite aerogels are developed using the unidirectional freeze-casting technique. Benefitting from the aligned porous structure, the composite aerogel with an optimal BNNS content exhibits a combination of an ultralow TC of 20.3 mW/mK in the through-thickness direction, a high solar-weighted reflectance of 95.0 % over the whole sunlight wavelength and a high emittance of above 93 % within the atmospheric transparency window. These exceptional thermo-optical properties enable the composite aerogel to maintain the interior temperature much cooler than commercially available foams, making them promising candidates as superinsulating envelopes for energy saving in buildings towards carbon neutrality.

Original languageEnglish
Article number107522
JournalComposites Part A: Applied Science and Manufacturing
Volume169
DOIs
Publication statusPublished - Jun 2023

Keywords

  • Aerogel
  • Boron nitride nanosheets
  • Freeze-casting
  • Thermal insulation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials

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