| Titre : |
Structural colours inspired by nature : Nanostructures found in plants and insects have useful commercial applications |
| Type de document : |
texte imprimé |
| Auteurs : |
Hendrik Hölscher, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 36-41 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Chimie biomimétique
Couleur
Couleur -- Analyse
Nanostructures
Polyméthacrylate de méthyleLe poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec.
vision des couleurs
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Some plants and animals display vibrant colours that are produced by nanostructures not pigments. Recent advances in nano-analytics and fabrication reveal the physics behind these structural colours. Structural colours have several advantages over conventional pigments as they are very efficient in terms of brightness and material usage, and do not fade. These natural structures therefore make ideal prototypes for new types of colourfull materials and coatings. |
| Note de contenu : |
- Photonic crystal structures for consistent colour
- Commercial application not yet cost effective
- Colour shifts with shape memory opals
- Near-perfect whiteness inspired by nature
- Foamed PMMA scatters light of all wavelengths
- Fig. 1 : Peacock feathers contain voids [inset] which act as photonic crystals, producing the iridescent colours
- Fig. 2 : 3D cinema glasses reveal that the green rose chafer beetle only reflects left circularised light. It appears green through the left lens and black through the right
- Fig. 3 : a) The chitin nanostructure in this Morpho rhetenor produces its bright blue colouring. The smaller artificiel butterfly is another example of this type of nanostructure. b) High-resolution electron microscopy reveals this Christmas-tree like structure with its "branches" being only 50-70 nm thick. c) 80-year-old pendant demonstrates the longevity of structural colour
- Fig. 4 : Fabrication process of shape memory polymers opals (SMPOs)
- Fig. 5 : Demonstration of the colour change of a SMPO from orange/brown to green by mechanical stretching
- Fig. 6 : a) The white beetle Cyphochilus insulanus is well-known for its white appearance caused by its nearly perfectly scattering white scales ; b) The inner structure of the scales contains a random structure of nanoscale fibrils
- Fig. 7 : A process to fabricate a white PMMA coating by infiltrating supercritical CO2 |
| En ligne : |
https://drive.google.com/file/d/1PA_1jnSH6glqrtj8C_BlbOcbCpWjoGzt/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31220 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 11 (11/2018) . - p. 36-41
Aller sur edunet
Accueil
Structural colours inspired by nature in EUROPEAN COATINGS JOURNAL (ECJ), N° 11 (11/2018)
