Bioinspired Architectures of Cellulose Nanocomposites with Clay and Chitosan
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Tunicate nanocellulose has been highlighted for its straightness and high crystallinity. Here, we demonstrate the bio-inspired nanostructure of cellulose nanofiber (CNF) through two different assembly techniques. Firstly, a binary system of montmorillonite (MMT) and CNF forms the nanostructured film via vacuum filtration. The nanocomposite was fabricated with its hierarchically aligned structure of nacre. The superior mechanical properties and fire retardancy compare to pure CNF film have been shown, while maintaining high transparency and flexibility. Secondly, we prepared the layer-by-layer (LbL) film using chitosan and CNF. LbL film of chitosan/CNF shows varying transmittance and interference of reflected light depending on the number of bilayers. As a result, the controllable structural coloration was obtained with different thicknesses. The nanocomposite of eco-friendly biomaterials has the potential to be used in diverse industrial fields.