Fig. 5: Thermal insulation performance of the dual-gradient nanofiber aerogel.
From: Gradient nanofiber aerogels for extreme cryogenic and thermal environments
a Schematic diagram of the heat transfer mechanism of the dual-gradient aerogel. Temperature-time curves of the top and bottom surfaces of (b) the dual-gradient aerogel and (c) the non-gradient aerogel. d Thermal conductivity of different materials as a function of volume density. e Temperature-time curves of the dual-gradient aerogel and cold plate upon injection of liquid nitrogen. f Thermal infrared image of the dual-gradient aerogel under a simulated light source. Compression recovery images of the dual-gradient aerogel (g) on a 200 °C hot plate and (h) in −196 °C liquid nitrogen. i Surface temperature of the aerogel (15.0 mm thick) placed on the palm. j Change in surface temperature of the aerogel and palm over time. Source data are provided as a Source Data file.
