Fig. 2: Structural characteristics of HIP thermochromic films.
From: Hydrated ionic polymer for thermochromic smart windows in buildings
a Photographs of HIP thermochromic films transitioning between colored and transparent states in vacuum and air over time. b FTIR spectra comparison of PVP and HIP thermochromic films at 20 °C and 60 °C. c, d Peak fitting of octahedral and tetrahedral nickel complex species. e Schematic illustrating thermochromism caused by hydration and dehydration.
