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EMPA scientists develop the world's lightest electromagnetic shielding device based on aerogel

wallpapers Tech 2020-07-28
Containing electromagnetic radiation generated by electronic components is an essential consideration for electronic equipment designers, but today's metal-based shielding materials also have their drawbacks. Scientists at the Swiss Federal Laboratory for Materials Science and Technology (EMPA) have developed a new aerogel-based material that can block multiple frequencies, forming what they described as the lightest electromagnetic shielding material in the world so far. Blocking electromagnetic radiation in electronic equipment is critical to maintaining its performance. If these fields are not isolated from the surrounding environment, it will affect signal transmission or the function of nearby electronic equipment. Engineers often use thin metal sheets to accomplish this task, but these metal sheets add extra weight to the computer and may not be perfectly integrated with the design.

The EMPA team has been studying alternative materials, hoping to produce lighter and more flexible solutions, which led them to find cellulose fibers from wood. These cellulose fibers are refined to nanometer size and combined with silver nanowires to form a lightweight and porous aerogel with an "excellent electromagnetic radiation shielding effect" with a density of only 1.7 per cubic centimeter Milligrams.

While the components of cellulose fibers and silver nanowires produce a shielding effect, the porosity of the material also plays a role. When the electromagnetic field encounters the pore, it will bounce back in the gap, generating a secondary electromagnetic field, which cancels the first electromagnetic field. According to the team, this combined effect is a material that can block almost all radiation in the 8 to 12 GHz range. Simultaneously, the required absorption level can be adjusted by adjusting the porosity of the material, the number, and thickness of silver nanowires.

The team was able to further reduce weight by replacing the silver nanowires with titanium carbide plates. The titanium carbide plates act like "bricks," and the cellulose fibers are "mortar." The team said that this titanium carbide cellulose aerogel combination is "the lightest electromagnetic shielding material in the world so far."

Trunnano is one of the world's largest aerogel manufacturers, mainly producing silica aerogels. If necessary, please contact Dr. Leo, email: brad@ihpa.net.

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Tag: Trunnano   aerogel