A material capable of cooling without energy And without heating the surrounding environment? It is not science fiction, but an all -Italian discovery. THE’AENEASthe National Agency for New Technologies, Energy and Sustainable Economic Development, has developed a revolutionary metamaterial which could change the way we conceive cooling.
This special material is able to reflect solar radiation and emit heat directly into space, exploiting a physical phenomenon known as passive radiative cooling. The result? A lowering of the temperature up to 12 ° C compared to the external environmentwithout any energy consumption.
Still in the experimental phase, this technology could find application in theThermal insulation of buildingsin the sector textilein the’food industry And in many other areas, offering an innovative and sustainable solution to counter global warming.
How the Enea metamaterial works works
To understand the operation of this extraordinary material, you have to start from a key concept: Passive radiative cooling. It is a natural process with which a body gives heat in the form of infrared electromagnetic radiationreducing your temperature.
A striking example is our planet: at night, without the sunlight to warm it, the earth releases warmth in the space, contributing to the lowering of the temperature. The metamaterial patented by Enea exploits this same principle: reflects solar radiationpreventing the heat from being absorbed, and at the same time it emits through an atmospheric windowsending it directly into the universe.
What makes this mechanism possible is his engineered compositionwhich gives him two fundamental properties:
To fully understand the functioning of this material, it is necessary to introduce a key concept of atmospheric physics: The atmosphere transparency windows. Not all electromagnetic radiation manage to cross the earth’s atmosphere. Some frequencies are blocked by atmospheric gases, while others manage to go freely to space.
The metamaterial of Aeneas uses one of these windows, in particular that between 8 and 13 micronsFor emit the heat without being absorbed by the atmosphere. In this way, the heat does not accumulate in the environment, but comes directly expelled in the cold spaceallowing the material of cool down without the need for external energy. To make this phenomenon possible is the presence of spectralely selective surfacesable to manage infrared radiation with extreme precision.
How metamaterial is produced and what materials make it up
The realization of this innovative material takes place through a process called sputteringa technique of deposition of thin layers on adhesive surfaces.
During the experimentation, the metamaterial was deposited on a metal substratethen enclosed in a transparent envelope To create an isolated environment. At first glance, the object seems to be a simple Empty rectangular boxbut inside it contains acrylic slabs filled with kryptona noble gas that minimizes the loss of heat by convection.
The materials used include Silver, aluminum nitride, aluminum oxide and silicon nitrurizearranged in a precise order. Everything was designed thanks to Sophisticated simulation softwarewhich have made it possible to optimize the configuration of the material to obtain the desired properties.
From the first tests, the metamaterial has shown that it can maintain a temperature up to 12 ° C lower than the environmental oneconfirming its enormous potential for practical applications.
What could be the future applications of this technology?
The main advantage of this technology is its ability to guarantee Passive coolingwithout consuming energy. If further developed, it could revolutionize numerous sectors:
At the moment, the material is still being tested and has not been tried outdoors. Enea is leading new research to verify her behavior in direct sunlight and to explore its effectiveness without the use of noble gases.
If the results continue to be positive, this technology could represent a real carried out in the fight against global warmingoffering an ecological cooling method, sustainable and completely zero impact.
