Figure 8.

Thermal Buddha Board effects on different candidate materials. M1–M3 are square pillars moulded on PE with either 10 (m1, m2) or 13 (m3) µm heights. The largest difference in thermal attenuation is seen for M3 when wetted and the pillar height has a more substantial impact than width. The nanoporous PE decreases in thermal transparency when mineral oil is added because the overall thickness is increased compared with the initial 12 µm and thermal transparency is already extremely high because the pore size is substantially smaller than IR wavelength.