Engineered pigments based on iridescent cellulose nanocrystal films
| Autor: | Stéphane Coindeau, Raphael Bardet, Julien Bras, Naceur Belgacem, F. Roussel |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Optical Phenomena Vacuum Polymers and Plastics Pigmentation Osmolar Concentration Organic Chemistry Water Nanocellulose Iridescence Suspension (chemistry) chemistry.chemical_compound chemistry Nanocrystal Ionic strength Materials Chemistry Nanoparticles Degradation (geology) Extrusion sense organs Cellulose Composite material |
| Zdroj: | Carbohydrate Polymers. 122:367-375 |
| ISSN: | 0144-8617 |
| Popis: | A simple method to produce biobased iridescent pigments from cellulose nanocrystal (CNC) films is reported. The process consists of forming nanostructured films from a CNC liquid-crystalline suspension and an appropriate dry grinding. The features of the iridescent pigments are described; they have a flake-like morphology with a thickness of 25 μm. However, because of the presence of sulfate groups, thermal degradation and high redispersion in water occur, which affect the iridescent property of these biobased pigments. To overcome such limitations, two post-treatments are proposed. The sulfate ester groups are removed from the iridescent pigments with vacuum overdrying. The mass loss of iridescent pigment in water is reduced with an increase of the ionic strength in the aqueous medium by NaCl addition. These post-treatments have proven to be efficient and engineered pigments based on CNC films can be used to add anticounterfeiting features to packaging manufactured by classical paper techniques or extrusion. |
| Databáze: | OpenAIRE |
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