Ultra white: Researchers at Purdue University in the US have developed an ink that counteracts global warming. The ultra white dye can be used in buildings to reflect sunlight and radiate infrared heat.
In addition, it can keep surfaces cooler than room temperature. According to the inventors, the paint can cool the buildings to the point that it eliminates the need for air conditioning, thereby reducing carbon emissions.
In the tests conducted by the researchers, the ultra white dye was able to reflect 98.1% of the sunlight. In this way it can cool the surfaces to 4.5 ° C below room temperature.
White ink designed to resist heat typically reflects only 80% to 90% of light. In addition, they are not designed to make surfaces cooler than the environment.
“If you use this paint to cover a roof of about 90 square meters, it has a cooling capacity of 10 kilowatts. This is more powerful than central air conditioners in most homes, ”explains Xiulin Ruan, professor of engineering at Purdue.
The secret of cooling
The secret of the ultra white dye is barium sulfate. With different sizes, the high concentration of particles of the chemical compound gives the ink the widest spectral dispersion and helps to increase the reflection factor.
“We have analyzed various commercial products, basically anything that is white. We discovered that in theory you can make things much more reflective and whiter than they are with barium sulphate, ”explains researcher Xiangyu Li.
The dye is the result of six years of research and has already undergone several tests and proved to be more resistant than the paints available on the market. So the researchers have already filed a patent application with the Technology Commercialization Office.