Construction of materials absorbing electromagnetic waves

A new breakthrough in electromagnetic wave absorption building materials is envisioned in the Journal of Materials Science and Technology. Advanced cladding materials with green technology can make construction more durable for years to come.

To study: Green building materials illuminated by electromagnetic absorption function: a review. Image Credit: OlegRi / Shutterstock.com

Electromagnetic radiation in the building

Due to the widespread use of electronic equipment, electromagnetic (EM) radiation in buildings has exploded. EM radiation envelops human life from various sources of electronic transmission emission, accompanied by EM wave intervention, damage to human health, data security spills, residential pollution and others. problems.

Buildings can meet the basic living needs of human beings, while also realizing people’s desire for a living environment free from EM radiation. Buildings, as the main place of human daily life, are perfect supports for carrying out the damage preventive measures against electromagnetic radiation for humans. As a result, the advancement of building materials with functions of preventing the radioactivity of electromagnetic waves may be able to meet the demand.

Construction that absorbs waves

The use of building materials absorbing EM waves in the building structures sector can endow the building with protective characteristics against EM radiation, thereby improving the EM atmosphere of building structures.

This is essential for creating EM wave absorbing components for buildings, which are crucial components that bolster efforts in the field to improve EM protection, thereby achieving better and faster environmental sustainability for humans. The anti-EM radiation structures that prevent further electromagnetic pollution are mainly based on the concept of absorption. As a result, materials based on the absorption of EM waves have become the subject of study for EM radiation protection in buildings.

Precast concrete

Concrete is one of the most important components of civil engineering today. It is made up of a specific proportion of mixtures of concrete, agglomerates and water, is created by agitation and pulsation, and is successfully processed under specific conditions.

Due to their high tensile strength, resistance to water, fire, chemicals, alkali barrier properties, frost resistance and ease of cleaning, ceramics are frequently used in construction projects. The construction of easy-to-install, portable and beautiful prefabricated buildings has also attracted public interest.

Further reading of AZoM – Metamaterials: an overview

Prefabricated building materials can achieve complex structures while facilitating the integration of other elements. Electromagnetic waves capable of absorbing materials with good absorption and construction performance are constantly emerging, constantly interesting people’s perceptions of the material world.

Nickel metal as polymer composites

The magnetic force of metallic nickel is mainly attributed to the spin of charged particles in 3D. Without an external electromagnetic field, the magnetic particles revolve around the comparable anisotropic soil. Natural resonance frequency under the impact of damping whenever the frequency of the EM field implemented is equal to the recurrence of the rotation of the 3D electrons and a precession movement occurs near the comparable anisotropic field.

The loss of the permanent magnet can also be caused by dimensional resonance frequency, transfer resonance, and grain boundary resonance. The different types of EM polymer composite can realize the synergistic activity of electrical resistivity and magnetic loss, thereby improving the efficiency of EM wave attenuation. Meanwhile, hybridization of heterogeneous content will result in a capacitor-like structure.

Ceramic ecological building

Many factors are considered in the ratio of raw materials and structural system of ceramic-based construction requirements to ensure that the modulus of elasticity and water permeability are within the regulatory requirements.

At the same time, since ceramic materials are mainly used for exterior decoration of buildings, the effects of porous structure and water absorption on increasing ceramic surface density and stain removal should to be taken into account. Priority should be given to the introduction of innovative microcrystalline glass floor tiles with both decorative and electromagnetic wave absorption characteristics.

Intelligent EM materials in concrete

At present, the majority of intelligent EM materials for use in concrete are protective materials. Protective materials depend on reflection rather than absorption, and yet reflection does not really dissipate EM energy, it simply changes direction where most EM waves are transmitted, so EM contamination does not dissipate EM energy. is not completely eliminated.

Concrete has many applications in the construction industry. It is important to obtain concrete with EM wave absorption efficiency for anti-EM radiation buildings. Meanwhile, the amount content of cement as part of concrete is only about 30%, while the amount content of aggregate is about 60%. As a result, concrete with cement as the primary absorption component has a very narrow efficiency bandwidth.

Limits

There is a lack of adequate system assurances in terms of actual effect test results, demonstration and company strategy in related research in the area of ​​radioactivity anti-EM building materials. Optimizing the criteria for evaluating the absorption properties of electromagnetic waves for buildings on the basis of an overview of prospective work, technical assistance and a theoretical basis provides standards for implementation. comprehensive and feasible work for the research community.

At the same time, there is a need to establish the technology in the form of a framework for the development of anti-EM radioactivity in buildings on the basis of scientific and sensible preparation.

Reference

Liu, T., et al. (2021). Green building materials illuminated by electromagnetic absorption function: a review. Journal of Materials Science and Technology Available online December 28, 2021. https://www.sciencedirect.com/science/article/pii/S1005030221010562?via%3Dihub

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