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Ultra-white paint can replace air conditioning

21.04.2021

Purdue University scientists have made an ultra-white paint that reflects 98,1 percent of sunlight and has a cooling effect on par with air conditioners.

Commercially available heat reflective paints are capable of reflecting 80 to 90 percent of sunlight. The new ink also has cooling properties thanks to particles of barium sulfate, a compound used in white photographic paper and cosmetics.

Scientists changed the size of the particles and were able to control the ability of each of them to scatter light. Spectral dispersion contributes to high reflectivity.

Experts have found that it keeps the surface temperature 10,5 degrees Celsius below ambient temperature at night and 8 degrees below daytime under sunlight.

"If this paint were applied to a roof area of about 1000 square feet (93 square meters), a cooling capacity of 10 kilowatts could be obtained. This is more than the air conditioners used in most homes," says Purdue University mechanical engineering professor Xiuling Ruan.

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Computer access under control 11.11.2004

To prevent the databases of the Criminal Investigation and other intelligence agencies from being sold openly, as happens in some countries, 160 senior Mexican law enforcement officials, including the Attorney General, received special implants.

A microcircuit the size of a grain of rice, planted under the skin of the wrist, responds to a radio signal sent by a special sensor in the office computer's keyboard and tells the computer the user's individual number. So access to official information on criminals from the database of the Ministry of Justice is received only by those who are allowed to do so.

Moreover, the computer registers who requested what data, and in case of leakage, the culprit will be found.

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