The Lawrence Berkeley National Laboratory in the United States has developed a smart glass that can make doors and windows smarter with the help of nanocrystal technology. An ultra-thin nano-coating is embedded in this glass, which can adjust the light entering the glass as needed. It can be controlled in light and dark, adjustable in heat and cold, and is expected to greatly reduce the cost of air conditioning and lighting in buildings. Related research was published in the journal Nature.
Different from the existing technology, the coating can achieve selective control of visible light and heat-generating near-infrared (NIR) light, so as to maximize comfort and save energy under different climatic conditions.
Delia Millerong, a chemist at Lawrence Berkeley National Laboratory who led the project, said: "In the United States, about a quarter of all the energy we consume is used for lighting, heating and cooling of buildings. Currently in cities Many buildings are covered by a lot of glass, and the use of new materials will greatly improve the energy efficiency of such buildings. "
Mi Lirong's research team was previously known for the development of heat-shielding glass that blocks near-infrared light and allows visible light to pass through. The key to this technology is the electrochromic effect. The new research requires their technology to reach a new height and achieve independent control of visible and near-infrared light. This means that users can ensure indoor lighting without adding extra heat, thereby reducing their dependence on air conditioning and artificial lighting.
The core of the new technology is a redesigned electrochromic material consisting of indium tin oxide nanocrystals and niobium oxide embedded in a glass matrix. In addition to controlling visible light and near-infrared light separately, windows using this technology can also switch to shading mode (shielding near-infrared light and visible light at the same time) or full-light mode (so that all light enters the room without obstruction) as needed.
The researchers found that the synergistic interaction of nanocrystals in tiny areas of glass can enhance the electrochromic effect, which means that the thickness of the coating can be further reduced without sacrificing performance. The most important thing is that the atomic connection method of the nanocrystalline glass interface leads to the rearrangement of the glass matrix structure, which expands the internal space of the glass matrix and makes the movement and entry and exit of charges easier. This is also the research and development of new battery materials. Provides ideas. From the point of view of material design, they have proved that they can be given new characteristics by adding different materials to a single homogeneous material.
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