چکيده
Millions of dollars are paid annually to import electromagnetic absorbers to make
rooms and non-reflective coatings. Likewise, electromagnetic coatings, by reflecting or
absorbing electromagnetic waves and reducing their passage through the coating are
significant areas.
The negative impact of waves emitted by electronic devices on living tissues makes the
subject necessary to cover more than before. Electromagnetic waves cover a wide range
from radio waves to gamma rays and cosmic rays. The electromagnetic spectrum for any
object, is a sign of the scattering of electromagnetic rays absorbed or generated by an
object, and depending on their frequency are called by different names. Radars detect
objects by emitting electromagnetic waves and receiving bounced off waves, which in
turn the absorption of these waves is important.
Electromagnetic waves are applied variously in the telecommunications industry (fiber
optics, waveguides, satellites, etc.), military industries (radar, bombs, missile trackers,
etc.), medicine (photography, radiology, sonography, X-ray and gamma in medical
physics, ...), industries (laser cutting, magnetic train and chair, etc.) and in astronomy
(studying the structure of celestial bodies, etc.). Today, the construction of surfaces to
deal with harmful waves caused by mobile phones and other sources of production of
harmful waves for humans, isolation of research laboratories against undesirable waves
and also prevention of disruption in experiments, aircraft coverage, etc. are among the
applications of these absorbers.
In the field of textiles, the UV-resistant nano-coating created on textiles like curtains
prevents ultraviolet light from entering the indoor space, prevents damage to the skin
and eyes, and prevents the color of the textiles from turning white. Zinc oxide and
titanium dioxide are some of the nanomaterials used to make such textiles. Zinc nanoxide
provides effective photocatalytic properties upon exposure to light and is used as an
antimicrobial and self-cleaning property in textiles. Textiles containing metal
nanostructures are also considered as a protective coating against electromagnetic
waves. With the increasing interest of industry in the use of nano, of course, in this
seminar special effort has been made to interpret, the types and performances of
nanomaterials absorbing electromagnetic waves and some related fields will be
discussed.
