Cement particles are coated with carbon nanofibers and nano fibers resist electromagnetic radiation

Tuesday March 5th, 2019

New construction materials against electromagnetic radiation with components including cement-based binders attached to carbon nanotubes and nanofibers on the surface of Russian scientists, will have applications widely in the construction of military and civil works.

According to the press release of St. Petersburg Polytechnic University, Russia, protecting people from electromagnetic radiation is a necessary and important condition in modern life. One of the ways of protection is to use construction materials that absorb radio waves. And such materials have been scientists at the Institute of Civil Engineering at St. Petersburg Polytechnic University, Russia developed within the framework of Project 5 – 100.

Researcher, Artemiy Cherkashin, has proposed a unique formula for composite construction materials with radio absorbing properties. And the level of wave absorption can be adjusted depending on construction conditions. The resulting material consists of a adhesives based on carbon-cement materials, water and functional additives, in which cement is attached to carbon nanotubes and nanowires on the surface.

Cement particles are coated with carbon nanotubes and nanofibers.

According to the developer, nanotube reinforcement technology is not new, but for the first time scientists have obtained both durable and absorbing radio waves. The author of the invention shares that, first of all, the military will be interested in inventions because materials can be used to disguise strategic military structures, avoiding detection radar types. However, materials can also be used in industrial and civil construction, where the impact of radio waves needs to be reduced.

The degree of absorption of radio waves in the material is adjusted by the thickness of the coating, the concentration and the ratio of the filler to the adhesive. The thicker the coating, the object becomes “invisible” to the radar. Thanks to the composition of the cement that has been implanted with nanotubes, the cost of producing new materials is significantly reduced.

The properties of the aforementioned materials have been tested on special measuring devices. The test results confirm radio wave absorption characteristics and demonstrate the ability to completely hide different objects (when needed) with such material from the electromagnetic field.

In the future, concrete producers will be able to adjust production and obtain materials with the necessary radio absorbing properties right at the stage of cement production at the factory, without having to mix Mix different additives later.

VLXD.org (TH)