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Digital color in cellulose nanocrystal films.

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Dumanli, Ahu Gümrah 
van der Kooij, Hanne M 
Kamita, Gen 
Baumberg, Jeremy J 


Cellulose nanocrystals (CNCs) form chiral nematic phases in aqueous suspensions that can be preserved upon evaporation of water. The resulting films show an intense directional coloration determined by their microstructure. Here, microreflection experiments correlated with analysis of the helicoidal nanostructure of the films reveal that the iridescent colors and the ordering of the individual nematic layers are strongly dependent on the polydispersity of the size distribution of the CNCs. We show how this affects the self-assembly process, and hence multidomain color formation in such bioinspired structural films.



Cellulose, Color, Microscopy, Electron, Scanning, Nanoparticles, Polystyrenes

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ACS Appl Mater Interfaces

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American Chemical Society (ACS)
Biotechnology and Biological Sciences Research Council (BB/K014617/1)
Engineering and Physical Sciences Research Council (EP/G060649/1)
Engineering and Physical Sciences Research Council (EP/H00338X/2)
European Research Council (320503)
The research leading to these results has received funding from the BBSRC David Phillips fellowship (BBSRC David Phillips, BB/K014617/1) and Next Generation fellowship (to S.V.) and the Schlumberger Foundation (Faculty for Future fellowship to A.G.D.), the EPSRC Carreer Acceleration Fellowship (EP/ H00338X/2) the Royal Society (E.R.), EPSRC grant EP/ G060649/1 (to U.S. and J.J.B.), and ERC LINASS 320503 (to J.J.B.).