Stay Cool (IMAGE) DOE/Sandia National Laboratories Caption Sandia National Laboratories materials physicist Paul Clem holds a sample of nanoparticle coated glass. Thermochromic nanoparticles switch from infrared transparent to infrared reflective when they heat up, which will help to keep office buildings, homes and even cars cool. Credit (Photo by Randy Montoya) Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.