Abstract
Unique rheological and phase behaviors of rod-like nanocrystalline cellulose (NCC) suspensions in aqueous media are revealed in the present article. Specifically, the NCC aqueous suspension remained isotropic in a wide NCC concentration range in which the suspension underwent transition from dilute solution to gel, and the relative viscosity of the NCC suspension could be well fitted by the Sato-Teramoto theory in the full concentration range tested. Correspondingly, both zero-shear viscosity and complex viscosity increased monotonically with NCC concentration, and no maximum value was observed along the curves of zero-shear viscosity or complex viscosity versus NCC concentration, indicating a deviation from the lyotropic system. However, a shear-induced birefringence phenomenon was observed, indicating the NCC suspension formed a temporary ordered structure in the external force field but was unable to form an anisotropic (liquid crystalline) phase. The Cox-Merz rule was not applicable for the NCC suspension as a result of oriented domains, i.e., rod-like NCC particles. Moreover, time-concentration superposition was successfully applied to both the storage and loss modulus, attributed to the isotropic feature of the NCC suspension in the tested concentration range. The reason why this NCC suspension remained isotropic could be because of the strong electrostatic repulsions between NCC particles and the weak tendency or driving force of anisotropy formation as a result of the small aspect ratio of NCC particles, Na+ counterions and large amounts of negative charges along the NCC particles. The results suggested that not all the rod-like particles were able to form an anisotropic phase in aqueous suspension, but dominated by various factors.
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Acknowledgments
The work was financially supported by Alberta Innovates-BioSolutions (which includes the former Alberta Forestry Research Institute) and the National Natural Science Foundation of China (51203122). SEM measurements were performed at the National Institute for Nanotechnology of the National Research Council of Canada. We thank Dr. Christophe Danumah for the SEM micrographs, DLS and zeta potential measurements. We also thank Prof. Jeremy P. Richards for providing the polarized optical microscopy equipment in his laboratory.
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Lu, A., Hemraz, U., Khalili, Z. et al. Unique viscoelastic behaviors of colloidal nanocrystalline cellulose aqueous suspensions. Cellulose 21, 1239–1250 (2014). https://doi.org/10.1007/s10570-014-0173-y
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DOI: https://doi.org/10.1007/s10570-014-0173-y