A perfect insulator, or a material that reflects heat while absorbing none of it, has been created by scientists at the Massachusetts Institute of Technology and Sandia National Laboratories.
"All the heat that hits it gets shot back in the other direction," said Edwin Thomas, a scientist at MIT and co-author of a recent paper in the journal ACS Nano Letters describing the creation of a low-temperature perfect insulator. "If you could put the right material on the wall (of a home), the heat from your body would be enough to heat it."
Now the MIT scientists have created structures 10 nanometers across that manipulate even tinier hypersonic waves gigahertz in size. Most people know hypersonic waves by a different name however: heat. When a sound wave becomes incredibly tiny, it actually functions as a heat wave.
"Once you get into the regimen where you can affect a material's thermal properties this leads to other exciting possibilities," said Oskar Painter, a scientist at Caltech who wasn't involved with the MIT research.
Perfect Insulators Now Only Work at Below Freezing Temps
Sound could control heat. Light could control electricity. A whole realm of new devices could arise from this technology said Painter, but it will take years before they end up in consumer's hands.
MIT isn't the only group working on perfect insulators. Another group of scientists from Sandia National Laboratories and the University of New Mexico are also hard at work creating new heat-controlling materials.
"We will soon start to make devices for manipulating photons, phonons and electrons, all at the same time," said Roy Olsson, a scientist at Sandia National Laboratories.
Right now the perfect insulators created by the MIT, Sandia, the University of New Mexico and other scientists only work at below freezing temperatures. The colder the temperature, the longer the wavelength, and the easier it is to manipulate the wave.
The Technology Could Also Produce More Efficient Cell Phones
To reflect heat at room temperature, the scientists will have to pattern structures between one and 10 nanometers. Olsson and his team have theoretical evidence that this is possible, and will build and test a room-temperature heat reflector within the next several months.
Intel, the computer chip manufacturer, can already mass produce patterns at about 30 nanometers. However, Intel isn't likely to get into the housing insulation market any time soon, adds Olsson.
The technology to produce chips with nanoscale patterns is still expensive -- too expensive to cover the walls of most homes.
For orbiting satellites that must maintain a constant temperature, however, a perfect insulator would be ideal to lower satellite's weight, launch cost and energy requirements. Closer to home, heat manipulating chips would cool down hot laptops and extend a battery's charge. The insulator could also be used produce cooler, more energy efficient cell phones and allow cell towers to squeeze in more phone calls or more data.