UV rays which are present in sunlight are the electromagnetic radiations of wavelength 100nm to 400nm. UV rays are subdivided into UVA, UVB and UVC. All UVC (very short wavelength UV) is absorbed by the atmosphere and does not reach the earth’s surface. UVB is biologically damaging, causing sun burns, cancer, etc. but most of this is absorbed by the atmosphere. Long wavelength UVA is the most intense UV reaching the earth and can penetrate furthest into tissue, but it is not as biologically damaging as UVB.
Ozone layer (molecular oxygen present in upper atmosphere) is an effective absorber of UV rays. Depletion of the ozone layer results in people and the environment being exposed to higher intensities of UV, particularly UVB.
This problem was met with a solution in nanotechnology. Nanotechnology involves the design, production, and application of materials in the size range of 1–100 nm.
Zinc oxide nanoparticles and Titanium di oxide nanoparticles embedded in polymer matrices like soluble starch are a good example of functional nanostructures with potential for applications such as UV-protection ability in textiles and sunscreens.
Bulkier particles of zinc oxide and titanium dioxide have been used in sunscreens for decades to reflect or absorb cancer-causing ultraviolet light. But when these sunscreen ingredients are manufactured into nanoparticles – usually 25 to 50 nanometres wide – they behave differently. Despite clumping together when mixed into sunscreen, nanoparticles of titanium dioxide and zinc oxide not only retain their highly effective UV light-absorbing capacity, but also absorb and scatter visible light, rendering them transparent on the skin. And in comparison to other UV filters, they are more stable – requiring less reapplication – and are low irritant and low allergen materials.
Nowadays, UV block coatings are also designed to provide protection to various surfaces like wood, metal, glass, plastic, painted surfaces from deterioration caused by UV radiation. Conventional organic UV absorbers used in these coatings are prone to degradation and do not provide the long-term protection. To overcome this problem, inorganic UV absorbers like nanoparticles of titanium dioxide (TiO2) and zinc oxide (ZnO) are used in these coatings to provide protection against UVA and UVB. They attenuate UV light by absorption and scattering.
Architectural Paint: Painted Surfaces exposed to UV radiation are tending to have some chemical modification resulting in change of color, loss of gloss, chalking and flaking. UV resistant coating absorbs UV rays and protects the painted surface from destruction.
Glass: Transparent UV block coating can be coated on glass surfaces to reduce the amount of ultraviolet rays that passing through that particular surface. These coatings have been widely used in eyeglasses and automotive windows. Electronic devices like computer screens, keyboards and other gadgets can also be treated with UV protective coating.
Plastic Surface: Many auto body components which are made of plastic such as Interior covering, dashboards, cable insulation, etc. If these components are exposed to UV rays there degradation is accelerated. To protect these components from the harmful effect of UV irradiation, they are coated with UV block coatings.
Wooden Surface: Wood exposed to sunlight turns yellow. This yellowing of wood is the result of photochemical decomposition of lignin triggered by the ultra violet rays present in the sunlight. Lignin is one of the main components of wood and due to its aromatic structure it is able to absorb radiation below 440 nm. Thus, the transparent UV protected coatings are required to retain the natural appearance of wood.
Metal Surfaces: In the presence of UV radiations, metal dissolution and corrosion rate tends to increase. So, UV resistant coatings can be applied on metal surfaces to provide them protection from deterioration caused by UV radiations.
Reinste Nano Ventures is the manufacturer, importer, distributor and supplier of superior grade Nanomaterials and high quality cost effective nanocoatings in India. These coatings are based on nanotechnology and are cost effective, easy to apply, for both household and industrial use.
Reinste provides different coatings for various surfaces which can effectively resist UV radiations and protect the surface from the harmful effect of UV rays. Besides giving protection from UV these coatings can also make these surfaces water repellent, dirt repellent and easy to clean.
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