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Large-scale fabrication of structurally coloured cellulose nanocrystal films and effect pigments
Summary
Researchers used roll-to-roll deposition to produce large-area photonic films from cellulose nanocrystals — renewable, plant-based particles that self-assemble into structurally colored materials — demonstrating that the resulting effect pigments and glitters offer a biodegradable, non-toxic alternative to conventional microplastic-based glitters.
Cellulose nanocrystals are renewable plant-based colloidal particles capable of forming photonic films by solvent-evaporation-driven self-assembly. So far, the cellulose nanocrystal self-assembly process has been studied only at a small scale, neglecting the limitations and challenges posed by the continuous deposition processes that are required to exploit this sustainable material in an industrial context. Here, we addressed these limitations by using roll-to-roll deposition to produce large-area photonic films, which required optimization of the formulation of the cellulose nanocrystal suspension and the deposition and drying conditions. Furthermore, we showed how metre-long structurally coloured films can be processed into effect pigments and glitters that are dispersible, even in water-based formulations. These promising effect pigments are an industrially relevant cellulose-based alternative to current products that are either micro-polluting (for example, non-biodegradable microplastic glitters) or based on carcinogenic, unsustainable or unethically sourced compounds (for example, titania or mica).
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