What is photochromism?
Photochromism is a reversible color change, specifically a process that describes the change in color in the presence of ultraviolet (UV), visible and infrared (IR) light. This phenomenon is commonly observed in transitional lenses, which are types of lenses with glasses that darken in the outdoor sunlight and clarify in the inner light. Photochromic substance shows a change in color in the presence of certain types of light, such as UV sunlight that activates transient lenses. This phenomenon occurs due to the absorption characteristics of molecular material in response to the radiation of the wavelength. Different materials can respond with their own characteristic transmission spectra, which are transformed in the presence of variations of light. It is also Credited with the discovery of Radium F, Isotope of Pierre and Marie Curie Polonio during his work at the University of Berlin. Although the photochromic phenomenon was observed by others as early as 1867, Marckwald was in his studio of benzo-1-nafyrodin and Tetrachloro-1,2-Keto-In fact, naphtalenone determined in the light.
Simply put, the chemical compound exposed to the light is transformed into another chemical compound. In the absence of light, it transforms back to the original compound. These are marked as forward and back reactions.
Color shifts can occur in organic and artificial compounds and also take place in nature. The key criterion is the reversibility in the name of this process, although irreversible photchromism may occur if the materials undergo a permanent color change with an exposure to ultraviolet radiation. However, this falls under the umbrella of the photomaster.
Numerous photochromic molecules are categorized in several classes; These include Spiropyrans, Diarylethhenes and photchromic chinons. Inorganic photochromy may include silver, silver chloride and zinc halogenides. A silver chloride is a compound that is usually used in the eagleBoth photochromic lenses.
6 Three -dimensional optical data storage uses photochromism to create memory drives capable of holding a tertiac data or essentially 1,000 gigabytes. Many products use this change to create attractive functions for toys, textiles and cosmetics.observation of photochromic belts in some parts of the light spectrum allows non -destructive monitoring of processes and transitions related to light. Nanotechnology relies on photchromism in the production of thin filmup. The effect may correlate with colored responses to the surface area of the film, which can be used in any number of optical or material thin -layer applications; For example, the use includes the production of semiconductors, filters and other technical surface treatments.
Usually, photochromic systems are based on unimolecular reactions that occur between two states with particularly different absorption spectra. The process is often a reversible shift in thermalradiation or heat as well as visible spectral light. The use of this phenomenon for consumer products and industrial technologies involves tying these natural molecular changes to the desired transmission and absorption of light for many desired effects. Energy band engineering of products and technologies is significantly reinforced between light, materials and elements with these modifications.