| Titre : |
Thermochromism technology in paint : A review |
| Type de document : |
texte imprimé |
| Auteurs : |
Dashrath Gangaram Salvi, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 70-78 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Pigments
Revêtements:Peinture
Thermochromie
|
| Index. décimale : |
667.6 Peintures |
| Résumé : |
Thermochromism is the property of substances to change color due to a change in temperature. A mood ring is an excellent example of this phenomenon, but thermochromism also has more practical uses, such as baby bottles which change to a different color when cool enough to drink, or kettles which change when water is at or near boiling point. Thermochromism is one of several types of ch romism
Thermochromic pigments are sensitive to temperature. They change colour when they are heated up or cooled down. This property is useful for indicating if the drink in a cup is hot, or if the water in a kettle is hot. Phosphorescent pigments glow in the dark. They are able to absorb light energy and store it.
Thermochromic paints use liquid crystals or leuco dye technology. After absorbing a certain amount of light or heat, the crystallic or molecular structure of the pigment reversibly changes in such a way that it absorbs and emits light at a different wavelength than at lowertemperatures.
A mood ring shown face front, showing a band of green color change across a brown background. |
| Note de contenu : |
- ORGANIC MATERIALS : Thermochromatic liquid crystals - Leuco dyes - How thermochromic liquid crystals work - How leucodyes work - Polymers - Thermochromic polymer systems based on bragg reflection - Liquid crystalline polymers with thermochromic properties - Thermochromic gel networks based on bragg reflection - Thermochromic polymer systems based on the absorption of light conjugated polymers - Gel networks - Inorganic thermochromic material - Irreversible inorganic thermochromes - Application of thermochromic technology
- Table 1 : Generic types of thermochromic polymers classified by the effect on light
- Fig. 1 : Molecular structure of the acrylates C6M and CBC
- Fig. 2 : Thermochromic switching from blue to colorless of a thermoplastic polymer foil
- Fig. 4 : Proton-transfer equilibrium between the phenol and phenolate form of the indicator dye 2,6-diphenyl-4-(2,4,6-triphenyl-1-pyridino)-phenol
- Fig. 5 : Thermochromic switching of a 3-mm-thick Cresol Red containing PVA/borax/surfactanthydrogel layer placed between two glass plates
- Fig. 6 : Visible absorption spectra of a 2,6-dipheny1-4-(2,4,6-tripheny1-1-pyridino)-phenolate containing PVA/borax/surfactant hydrogel in dependence on temperature (d = 1 cm). 100C (A); 20.0 (B); 30°C (C); 40.0 (D); 50.0 (E); 60.0 (F); 700C (G); 800C (H)
- Fig. 7 : UV-vis absorption spectra of a Cresol Red containing PVA/borax/surfactant hydrogel in dependence on temperature (d = 1 cm). 160C (A); 600C (B); 80.0
- Fig. 14 : Switching behavior of a sun protecting glazing (100 x 50 cm) containing a 2-mm-thick thermotropic hydrogel layer at 20.0 slightly above the switching temperature of 30.0 |
| En ligne : |
https://drive.google.com/file/d/1XPp0wItymGTheYsoucbfVO5Wy_fINow7/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36309 |
in PAINTINDIA > Vol. LXXI, N° 7 (07/2021) . - p. 70-78
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Thermochromism technology in paint : A review in PAINTINDIA, Vol. LXXI, N° 7 (07/2021)
