Impact of pore structure on the thermal conductivity of glass foams

Research output: Contribution to journalLetterpeer-review


  • Martin B. Østergaard
  • Rasmus R. Petersen
  • Jakob König
  • Peter D. Lee
  • Yuanzheng Yue

Colleges, School and Institutes


The thermal conductivity (λ) of glass foams is thought to depend on pore size. We report on the impact of pore size, determined using X-ray microtomography, and percentage porosity on the λ of glass foams. Glass foams were prepared by heating powder mixtures of obsolete cathode ray tube (CRT) panel glass, Mn3O4 and carbon as foaming agents, and K3PO4 as additive, to a suitable temperature above Tg, and subsequent cooling. Here, we report for the first time a correlation between λ and pore size in the range 0.10–0.16 mm showing a decrease from 57–49 mW m-1 K-1 with increasing the pore for glass foams with porosities of 87–90 %. This indicates that the pore structure should be optimized in order to improve the insulating performance of glass foams.


Original languageEnglish
Pages (from-to)72-74
Number of pages3
JournalMaterials Letters
Early online date26 Apr 2019
Publication statusPublished - 1 Sep 2019


  • Amorphous materials, Porous materials, Thermal propertiesX-ray techniques