Fig. 2: Statistical analysis on the porous structure of porous polymer coating (PPC) and fumed silica added porous polymer coating (FSPPC).
From: Humidity-tolerant porous polymer coating for passive daytime radiative cooling
Scanning electron microscope (SEM) cross-section images of (a) PPC dried at 33, 46, and 64 RH% and (b) FSPPC dried at 34, 46, and 59 RH% from top, respectively. Spheroidal modeling of the pore and definition of horizontal diameter (Lh) and vertical diameter (Lv) are illustrated in yellow ellipsoid. Structural parameters such as geometric mean diameter (LGMD) (c) and aspect ratio γ (d) of micropores in PPC and FSPPC depending on drying humidity. Error bar means the standard deviation of the size distribution. e, f Thickness and volumetric density of dried PPC and FSPPC depending on the drying-humidity. The error bars represent standard deviation of five independent measurements for each sample. g Thermal emissivity of PPC and FSPPC depending on the drying humidity. All scalebars in (a, b) are 10 μm. Source data are provided as a Source Data file.
