Imagine if your clothing could, on demand, release just enough heat to keep you warm, allowing you to lower your thermostat and still stay comfortable. Or picture a car windshield that stores the sun’s energy and then releases it to melt away a layer of ice. A team of MIT researchers says both scenarios may be possible soon, thanks to a new material that can store solar energy during the day and release it as heat whenever it’s needed. A transparent polymer film, it could be applied to many different surfaces, such as window glass or clothing.
The key to long-term, stable storage of solar heat is a chemical change, say MIT professor Jeffrey Grossman and postdoc David Zhitomirsky, who published their findings earlier this year. Whereas heat itself inevitably dissipates over time no matter how good the insulation around it, a chemical storage system can retain the energy indefinitely in a stable molecular configuration, until its release is triggered by a small jolt of heat (or light or electricity).
The system uses a type of molecule that can remain stable in either of two different configurations. When it’s exposed to sunlight, the energy in that light kicks the molecules into their “charged” configuration, and they can stay that way for long periods until their energy is released on demand.
Already, the preliminary system might be a significant boon for electric cars, which devote so much energy to heating and to deicing windshields that their driving range can drop by 30 percent in cold conditions. The new polymer could significantly reduce that drain, Grossman says.
10 Breakthrough Technologies 2024
Every year, we look for promising technologies poised to have a real impact on the world. Here are the advances that we think matter most right now.
Scientists are finding signals of long covid in blood. They could lead to new treatments.
Faults in a certain part of the immune system might be at the root of some long covid cases, new research suggests.
AI for everything: 10 Breakthrough Technologies 2024
Generative AI tools like ChatGPT reached mass adoption in record time, and reset the course of an entire industry.
OpenAI teases an amazing new generative video model called Sora
The firm is sharing Sora with a small group of safety testers but the rest of us will have to wait to learn more.
Get the latest updates from
MIT Technology Review
Discover special offers, top stories, upcoming events, and more.