File:Thermochromisme1-s2.0-S0300944023005246-gr2 lrg.jpg
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SEM micrographs of thermochromic pigments
vue au microscope électronique de pigments thermochromiques
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[edit]DescriptionThermochromisme1-s2.0-S0300944023005246-gr2 lrg.jpg |
Français : Vue au microscope électronique de pigments thermochromiques, montrant le pigment thermochromique, composé de particules sphériques d'un diamètre <10 μm, principalement constituées de carbone et d'oxygène, comme le révèle l'analyse élémentaire EDXS. La présence de particules sphériques dans la composition des pigments thermochromes a déjà été montrée dans des études antérieures qui ont démontré que les propriétés thermochromes de ces pigments résident dans la capacité des particules sphériques à passer d'un état coloré à un état incolore à une certaine température de transition (qui est ici de 28 °C : sous le seuil de 28 °C, les pigments apparaissent noirs, tandis qu'au-dessus de 28 °C, ils deviennent transparents blanchissant le matériau si une couche claire sous-jacente est présente.
Généralement, les pigments thermochromiques sont constitués de 3 composants différents, dont chacun joue un rôle spécifique : 1) le précurseur de couleur, qui fournit au pigment sa couleur fondamentale ; 2) le révélateur de couleur, qui confère le changement de couleur via des interactions d'acceptation/don d'électrons avec le précurseur de couleur ; 3) le solvant, capable de réguler la température de transition avec son point de fusion, favorisant la migration des composants ; Ce mélange est enfermé dans des microcapsules (cf. aspect poudreux du matériaux thermochromique dans le cas présent). English: SEM micrographs of thermochromic pigments, exhibits the thermochromic pigment, which is composed of spherical particles with a diameter <10 μm, mainly constituted of carbon and oxygen, as revealed by the EDXS elemental analysis. The presence of spherical particles in the composition of thermochromic pigments has been already detected in previous studies : indeed, the thermochromic properties of these pigments lie in the ability of the spherical particles to change from a colored state to a colorless condition at the transition temperature of 28 °C. In this specific case, beneath the threshold temperature of 28 °C the pigments appear as black, while above 28 °C they turn transparent. Typically, thermochromic pigments consist of 3 different components, each of which plays a specific role: 1) the color precursor, which supply the pigment with its fundamental color; 2) the color developer, which confers the color shift via electron acceptance/donation interactions with the color precursor ; 3) the solvent, able to regulate the transition temperature with its melting point, promoting component migration ; This blend is enclosed in microcapsules, similar to the spherical structures of the thermochromic powder characterized in this work, which must ensure the proper functioning of the pigments. |
Date | |
Source | https://www.sciencedirect.com/science/article/pii/S0300944023005246#f0015 (licence) |
Author | Massimo Calovi, Alessia Zanardi and Stefano Rossi (Departm)ent of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy |
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current | 12:41, 23 June 2024 | ![]() | 1,181 × 945 (370 KB) | Lamiot (talk | contribs) | Uploaded a work by Massimo Calovi, Alessia Zanardi and Stefano Rossi (Departm)ent of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy from https://www.sciencedirect.com/science/article/pii/S0300944023005246#f0015 ([https://creativecommons.org/licenses/by/4.0/ licence]) with UploadWizard |
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