| 초록 |
In recent years, radiative cooling has been actively studied as a method of heat dissipation. This technology is an environmentally friendly method that is able to cool the objects without additional energy consumption. In addition, since it is highly possible to apply to many things in everyday life such as buildings, vehicles, and electronic devices, the color of coolers should vary to be more actively used. Therefore, reflection-based colorful radiative coolers are manufactured by self-assembly of silica nanoparticles. Silica opal which is composed of silica nanoparticles in the size of 200 nm to 300 nm can display selective color by Bragg scattering. Also, the siloxane bonding of the silica nanoparticles can cool the things by emitting mid-infrared electromagnetic waves which can well pass through the earth’s atmosphere. At the outdoor daytime experiment, the cooler lowering the temperature of the silicon substrate to a 13.5 °C under the solar irradiance of 912 W/m2 on average. |
