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Photochromism - Wikipedia

Photochromism is the reversible transformation of a chemical species between two forms by the absorption of electromagnetic radiation (photoisomerization), where the two forms have different absorption spectra. In plain language, this can be described as a reversible change of colour upon exposure to light.

Photochromism | ScienceDirect

Photochromism is simply defined as the light induced reversible change of colour. The field has developed rapidly during the past decade as a result of attempts to improve the established materials and to discover new devices for applications. As photochromism bridges molecular, supramolecular and solid state chemistry, as well as organic, inorganic and physical chemistry, such a treatment requires a multidisciplinary approach and a broad presentation. The first edition (1990) provided an ...

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Photochromism - Fundamentals and Applications

Photochromism A B hν hν’ Photoreceptor : Rhodopsin (Chlamydomonas) Bacteriorhodopsin Phytochrome Mineral : Sodalite Natural Artificial Dyes : Spirobenzopyran, Azobenzene・・・ Matel-oxide Glass Chalcogenide Glass X X Y Y 514 nm 366 nm 300 350 400 450 500 550 600 λ / nm Abso r bance 0.4 0.3 0.2 0.1 II I I I I I I I I

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What Is Photochromism? - wiseGEEK

Mal Baxter Last Modified Date: August 23, 2020 . Photochromism is a reversible change of color, specifically a process that describes a change of color in the presence of ultraviolet (UV), visible, and infrared light.This phenomenon is commonly seen in transitional lenses, which are the kinds of eyeglass lenses that turn dark in outdoor sunlight and become clear in indoor light.

Photochromism: Memories and SwitchesIntroduction ...

Photochromism is defined as a reversible phototransformation of a chemical species between two forms having different absorption spectra. During the photoisomerization, not only the absorption spectra but also various physicochemical properties change, such as the refractive index, dielectric constant, oxidation/reduction potential, and geometrical structure.

Taking Photochromism beyond Visible: Direct One‐Photon NIR ...

Taking Photochromism beyond Visible: Direct One‐Photon NIR Photoswitches Operating in the Biological Window. Kristin Klaue. Department of Chemistry & IRIS Adlershof, Humboldt-Universitat zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany. Search for more papers by this author. Yves Garmshausen . Department of Chemistry & IRIS Adlershof, Humboldt-Universitat zu Berlin, Brook-Taylor ...

Photochromic Coatings | SpringerLink

Photochromism is a part of photochemistry dealing with reversible photochemical reactions. Photochromism was first reported by Fritsche in 1867 [1], who observed that tetracene with air and light produced a colorless material which regenerated to tetracene by heating. Since its discovery, photochromism has received considerable attention and it ...

Photochromism of molybdenum oxide - ScienceDirect

Since photochromism of MoO 3 can occur even in vacuum, it has been suggested that ambient water vapor does not seem to be an essential factor. The photochromic reaction for MoO 3 in vacuum is believed to occur as indicated by Eq. (13). In fact, this is a photodecomposition reaction, which is quite different from the coloration mechanism in air described above. Furthermore, the coloration state ...

Photochromism definition and meaning | Collins English ...

Photochromism definition: the reversible transformation of something's colour due to exposure to electromagnetic... | Meaning, pronunciation, translations and examples

Photochromism : molecules and systems in SearchWorks catalog

Photochromism is a part of photochemistry dealing with reactions which are thermally or photochemically reversible. It has received considerable attention ever since its discovery in 1876 and still is an active field of research because of its actual and potential applications and its paramount importance in biological phenomena. The book reflects the state of art in the different areas of ...

Photochromism - chemeurope.com

Photochromism is the reversible transformation of a chemical species between two forms by the absorption of electromagnetic radiation, where the two forms have different absorption spectra. Trivially, this can be described as a reversible change of color upon exposure to light. The phenomenon was discovered in the late 1880s, including work by Markwald, who studied the reversible change of color of 2,3,4,4-tetrachloronaphthalen-1(4H)-one in the solid state. He labeled this phenomenon ...

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Photochromism is a phenomenon that was discovered in the late 1880s by Markwald. Markwald called the process phototropy until the 1950s, when Yehuda Hirshberg proposed the use of the term photochromism. Basically, the degree of photochromism is molecular dependent. That is, the nature or type of molecules on the surface will determine the sensitivity of the photochromic material. Since then ...

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Define photochromism. photochromism synonyms, photochromism pronunciation, photochromism translation, English dictionary definition of photochromism. adj. Of or relating to a substance or object whose color changes on exposure to light: photochromatic glasses that darken in sunlight. pho′to·chro′mism n. Photochromism - definition of photochromism by The Free Dictionary . https://www ...

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Solid-state stimuli-responsive materials are attracting increasing attention due to their broad prospects in the field of functional materials, but there are still some challenges. We design and synthesize two efficient solid-state stimuli-responsive materials SP-TPEm (m = 4, 6) based on TPE covalent connection with N-position of spiropyran through different lengths of alkyl spacers.

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photochromism; References in periodicals archive? - - By smart glass technology segments (SPD, electrochromic, PDLC, thermochromic, photochromatic) Denmark Energy Efficient Glass Industry Business and Investment Opportunities Databook 2016-2018 & 2019-2025. Black Gold's Pro sight features first-, second- and third-axis adjustability, Skycoil technology for super-bright pins and the company's ...

Photochromic paint - Stardust Colors

Photochromic paint is in addition to other special paints that "react", among the reaction-effect paints. If you don't know what it is, do you know those glasses lenses that change color depending on the light?

PHOTOCHROMISME : Définition de PHOTOCHROMISME

photoélectron, photo-électron, subst. masc. Électron expulsé dans l'effet photoélectrique. Lorsque la fréquence est supérieure à la fréquence seuil, les électrons expulsés par l'action de la lumière (photoélectrons) sortent de la matière avec une énergie cinétique d'autant plus grande que la fréquence dépasse davantage la fréquence seuil (L. de Broglie, Théorie quanta, 1959 ...

Photochromism: Molecules and Systems - 1st Edition

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In its entire journey of development, Sunphey can exercise control over the production process and supply chain from raw materials to finished lenses, including the customized melting, grinding, polishing, edge cutting and hardening of optical glass, photochromism, film coating, assembly of diffusers, marking, hydrophobic oleophobic treatment.

PHOTOCHROMIC INK - ENGINEERING

PDF FILE - CLICK HERE FOR PRINTABLE WORKSHEET: Photochromic ink darkens, as the light level increases. Some photochromic inks change colour. In fact, it is UV light that causes the darkening of the ink, which means the ink works best in natural light.

photochromism - Wiktionary

photochromism. Definition from Wiktionary, the free dictionary. Jump to navigation Jump to search. English . English Wikipedia has an article on: photochromism. Wikipedia . Noun . photochromism (countable and uncountable, plural photochromisms) The reversible transformation of the optical properties of a material when exposed to electromagnetic radiation, especially the reversible darkening of ...

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Aggregation-promoted photochromism As shown in Fig. 3A, the colorless needle-shaped crystals of BDPM-DHT exhibit blue emission under UV lamp irradiation (365 nm) in accordance with their AIE characteristics.It was unexpectedly found that the colorless crystals became red when the UV lamp was removed, even after a very short irradiation time (∼1 second).

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Dr. Robert Göstl | DWI

Robert Göstl studied chemistry at Humboldt-Universität zu Berlin and has been involved in photochromism research in the group of Prof. Stefan Hecht since 2009. There, he obtained his diploma degree in 2011 working on sterically crowded cyclopentene-bridged dithienylethenes for enhanced photoswitching performance. In 2014, he finished his doctoral research on furylthienylethenes for ...

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Photochromism estas la reigebla transformo de kemia specio inter du formoj per la sorbado de elektromagneta ondo, kie la du formoj havas malsamajn sorbadspektrojn. [1] [2] Sensignife, tio povas esti priskribita kiel reigebla ŝanĝo de koloro sur eksponiĝo al lumo. La fenomeno estis malkovrita en la malfruaj 1880-aj jaroj, inkluzive de laboro fare de Markwald, kiu studis la reigeblan ŝanĝon ...

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Photochromism of yellow azo dyes: a specific phenomenon of ...

Furthermore photochromism decreases with increasing size of the aromatic moieties attached to the azo group, as well as with the increasing number of substituents located ortho to the azo linkage. Finally the photochromism of dyeings with the golden yellow chromophore of structure IV was reduced when they were finished with certain Knittex brands.

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Photochromic | Definition of Photochromic at Dictionary.com

Photochromic definition, (of chemically treated glass or plastic) capable of darkening or changing color when exposed to light. See more.

Photochromism | Article about Photochromism by The Free ...

photochromism[¦fōd·ō′krō‚miz·əm] (chemistry) The ability of a chemically treated plastic or other transparent material to darken reversibly in strong light. Photochromism the ability of a substance to undergo a reversible transformation, upon exposure to optical radiation, from one state to any other state in which an optical absorption ...

Photochromism of Spiropyrans - web.calpoly.edu

Photochromism is the process of inducing color changes in a medium by incident electromagnetic radiation.1 While many different compounds have been shown to exhibit photochromism, the class of molecules called spiropyrans have been the most extensively studied over the past several decades. Since the discovery of the photochromic reactions of spiropyrans in 1952 by Fisher and Hirshberg2,3 ...

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Photochromism

Photochromism is the reversible transformation of a chemical species between two forms by the absorption of electromagnetic radiation, where the two forms have different absorption spectra.

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Photochromic dental material - Ivoclar AG

Photochromism is understood to be a reversible transition of a chemical substance between two states with different absorption spectra, the transition being caused at least in one direction by electromagnetic radiation. ##STR1## When irradiated with light in the wavelength range of the absorption maximum λ1 of the starting state A, the substance changes to the higher-energy intensively ...

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