Effect of Anisotropy of Cellulose Nanocrystal Suspensions on Stratification, Domain Structure Formation, and Structural Colors

Biomacromolecules
Konrad W KlockarsOrlando J Rojas

Abstract

Outstanding optical and mechanical properties can be obtained from hierarchical assemblies of nanoparticles. Herein, the formation of helically ordered, chiral nematic films obtained from aqueous suspensions of cellulose nanocrystals (CNCs) were studied as a function of the initial suspension state. Specifically, nanoparticle organization and the structural colors displayed by the resultant dry films were investigated as a function of the anisotropic volume fraction (AVF), which depended on the initial CNC concentration and equilibration time. The development of structural color and the extent of macroscopic stratification were studied by optical and scanning electron microscopy as well as UV-vis spectroscopy. Overall, suspensions above the critical threshold required for formation of liquid crystals resulted in CNC films assembled with longer ranged order, more homogeneous pitches along the cross sections, and narrower specific absorption bands. This effect was more pronounced for the suspensions that were closer to equilibrium prior to drying. Thus, we show that high AVF and more extensive phase separation in CNC suspensions resulted in large, long-range ordered chiral nematic domains in dried films. Additionally, the average...Continue Reading

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Citations

Mar 31, 2020·International Journal of Biological Macromolecules·Keya GangulyKi-Taek Lim
Dec 11, 2020·Annual Review of Food Science and Technology·Long BaiOrlando J Rojas
Apr 27, 2021·Biomacromolecules·Livia K BastNico Bruns
May 4, 2021·Journal of Colloid and Interface Science·Soo-Ah JinRichard J Spontak
Aug 7, 2021·Biotechnology for Biofuels·Lisanne de VriesShawn D Mansfield
Feb 28, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Pascal BertschPeter Fischer
Dec 1, 2020·Biomacromolecules·Kevin J De FranceGustav Nyström
Jan 8, 2019·The Journal of Physical Chemistry Letters·Orla O'KeeffeMark J MacLachlan

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Methods Mentioned

BETA
EISA
scanning electron microscopy
membrane filtration
dynamic light scattering

Software Mentioned

ImageJ

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