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Thermochromic coatings are characterized as active, dynamic and adaptive materials that can adjust their optical properties according to external stimuli, usually temperature. Thermochromic coating modulate their reflectance as a function of their temperature, making them an appropriate solution for combating cooling loads, without diminishing ...
The spiro form of an oxazine is a colorless leuco dye; the conjugated system of the oxazine and another aromatic part of the molecule is separated by an sp 3-hybridized "spiro" carbon.
In chemistry, chromism is a process that induces a change, often reversible, in the colors of compounds.In most cases, chromism is based on a change in the electron states of molecules, especially the π- or d-electron state, so this phenomenon is induced by various external stimuli which can alter the electron density of substances.
Thermochromic ink (also called thermochromatic ink) is a type of dye that changes color in response to a change in temperature. [ 1 ] [ 2 ] [ 3 ] It was first used in the 1970s in novelty toys like mood rings, but has found some practical uses in things such as thermometers, product packaging, and pens. [ 4 ]
Thermochromic and photochromic are classified as passive technologies. [ 2 ] When installed in the envelope of buildings, smart glass helps to create climate adaptive building shells , [ 3 ] which benefits include things such as natural light adjustment, visual comfort, UV and infrared blocking, reduced energy use, thermal comfort, resistance ...
Organic ammonium salts of the type (R 3 NH) 2 [NiCl 4] are often thermochromic (R = Me, Et, Pr). Near room temperature, these salts are yellow , but these solids become blue when heated to near 70 °C. The bright blue color is characteristic of tetrahedral [NiCl 4] 2−, the intensity being a consequence of the Laporte selection rule. The ...
A liquid crystal thermometer, temperature strip or plastic strip thermometer is a type of thermometer that contains heat-sensitive (thermochromic) liquid crystals in a plastic strip that change colour to indicate different temperatures. [1] Liquid crystals possess the mechanical properties of a liquid, but have the optical properties of a ...
A receipt printed on thermal paper. A heat source near the paper will color the paper. Paper roll for thermal fax machine. Thermal paper (often supplied in roll form, and sometimes referred to as an audit roll) is a special fine paper that is coated with a material formulated to change color locally when exposed to heat.