Reference

The properties and applications of the world's lightest and most reflective paint, often referred to as the "whitest paint," are quite remarkable. Developed by researchers at Purdue University, this paint reflects up to 98.1% of sunlight, significantly more than previous formulations which reflected about 95.5%. This incredible reflectivity not only enhances energy efficiency but also contributes to passive cooling, making it a valuable tool in combatting heat buildup in urban environments.

Properties:

1. High Reflectivity: The paint reflects more than 98% of solar radiation, which can help lower surface temperatures.
2. Cooling Effect: In practical applications, it can cool surfaces by up to 19°F at night and 8°F during the day compared to the surrounding ambient temperature.
3. Lightweight: The ultralight version of this paint has a surface density of only 0.4 g/m², making it about 400 times lighter than traditional paints. This feature could have significant implications for transportation and construction industries.

Applications:

1. Building Exteriors: Its high reflectivity can significantly reduce air conditioning costs in buildings, making it an eco-friendly choice for urban architecture.
2. Automobiles: The paint's lightweight and cooling properties make it suitable for automotive applications, potentially improving fuel efficiency and comfort.
3. Aerospace: Due to its lightweight nature, this paint could be advantageous in aerospace applications where weight is a critical factor.
4. Climate Change Mitigation: By reflecting sunlight and reducing heat absorption, this paint can contribute to urban heat island mitigation and overall energy conservation strategies.

For more detailed insights and studies, you can explore the following sources:

• Purdue University's research on the ultrawhite paint BBC News.
• The paint's climate implications discussed in Science Alert.
• The ultralight properties of the paint detailed in Science Advances.

This innovative development not only opens up new avenues for energy efficiency but also helps address pressing environmental concerns.