The whitest paint in the world, created by researchers from the University of Perdew and entered the Guinness Book of Records, reflects so well the radiation that it can keep the surfaces cool and reduce the need for air conditioning, it is now known that researchers have developed new paint compositions that can be applied in a thinr layer to the surface being processed and used to remove heat from cars, trains and planes.
In the original whiteest paint in the world, barium nanoparticles were used to reflect 98.1% of sunlight, leaving the outer surface more than 4.5 °C colder than the ambient temperature.
The problem was that in order to achieve a high level of radiation cooling below ambient temperature, a layer of paint of at least 400 microns was required. This thickness was considered normal in the case of buildings, but in the case of more demanding designs, the paint should be thinner and lighter, so researchers created a new formula for the whitest paint, which made it thinner and easier.
A new version of paint can reflect 97.9% of sunlight with a layer thickness of 150 microns. Paint also has air voids, which makes it very porous in a nanoscale. Smaller density reduces weight, which is also an important aspect for further practical application of paint. According to available data, new paint weighs 80% less than analog based on barium sulfate, but has almost the same solar reflection rate.