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Published in: Cellulose 16/2020

08-09-2020 | Original Research

Yield stress analysis of cellulose nanocrystalline gels

Authors: Behzad Zakani, Dana Grecov

Published in: Cellulose | Issue 16/2020

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Abstract

The yield stress is an important rheological property which can be used to identify the suitability of a material for a wide range of applications. There is no consensus on the definition of the yield point nor on its measurement technique. Thus, defining a unique value for yield point would be crucial but a challenging task. Although rheology of Cellulose Nanocrystalline (CNC) suspensions has been widely studied, less attention has been paid to the yielding behavior of CNC gels. In this study, the authors performed different rheological tests on highly concentrated CNC suspensions to investigate their yielding behavior. Creep results demonstrated a clear viscosity bifurcation and its corresponding true yield stress. Reproducible values for static and dynamic yield points were obtained by adjusting the appropriate conditions for rotational and oscillatory rheometries. Stress ramp rheometry was demonstrated as the most proper method for determining the static and dynamic yield stress. Rheometry results also revealed that the yield points scale linearly with CNC concentration and there exists a critical concentration where yield stress reaches to zero.

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Metadata
Title
Yield stress analysis of cellulose nanocrystalline gels
Authors
Behzad Zakani
Dana Grecov
Publication date
08-09-2020
Publisher
Springer Netherlands
Published in
Cellulose / Issue 16/2020
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-020-03429-7

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