It is known that pores directly and significantly affect the thermal insulation of materials ,these pores are different shapes, and of necessity, this difference in their shapes affects the thermal insulation of the material unevenly, so what are the best forms of pores to improve the thermal insulation of materials
Bali,
This question has been addressed many times in the literature.
Tread carefully, Dow has this patented since 2016.
https://patents.google.com/patent/CN107454909B/en
And the literature is not void of such discussion:
https://www.sciencedirect.com/science/article/abs/pii/S1359431116304823
The science of effective conductivity of porous materials is well established: At high voidages it is the gas properties that dominate: at high temperatures the effective diameter of the solids is dominant. Accuracy is generally low as the conductivity depends on applied forces also, unless that material is very rigid. So, the answer depends on the material used and the construction of the layers.
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