Some experts have studied the thermal insulation coating prepared by hydrothermal treatment of Cs0.32WO3 nanoparticles under different acetic acid concentrations. They also used the ratio k as the parameter to evaluate the transparent thermal insulation properties of the coating. Here, k is a ratio of the transmittance maximum value Tmax in the visible light band to the transmittance T1100nm at 1100nm. They found that:
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The k value of the untreated Cs0.32WO3 powder is the smallest, and its transparent heat insulation performance is the worst. By comparing the k of the hydrothermally treated Cs0.32WO3 powder at different acetic acid concentrations, it was found that the synthesized powder k was the largest at an acetic acid concentration of 5mol/L. This is because acetic acid has a certain degree of reducibility, which promotes the conversion of W6+ to W5+ in CsxWO3 particles during the reaction, increases the carrier concentration in the nanorods, and improves the transparent heat insulation performance of the powder. At 10mol/L, the excessive concentration of acetic acid inhibits the H+ ionization of acetic acid, which in turn reduces the reducibility of the reaction system.
