Phase transitions of cellulose nanocrystal suspensions from nonlinear oscillatory shear
Journal article, 2022
Cellulose nanocrystals (CNCs) self- assemble in water suspensions into liquid crystalline assemblies. Here, we elucidate the microstructural changes associated with nonlinear deformations in (2–9 wt%) CNC suspensions through nonlinear rheological analysis, that was performed in paral- lel with coupled rheology—polarized light imaging. We show that nonlinear material parameters from Fourier-transform rheology and stress decomposition are sensitive to all CNC phases investigated, i.e. iso- tropic, biphasic and liquid crystalline. This is in con- trast to steady shear and linear viscoelastic dynamic moduli where the three-region behavior and weak strain overshoot cannot distinguish between biphasic and liquid crystalline phases. Thus, the inter-cycle and intra-cycle nonlinear parameters investigated are a more sensitive approach to relate rheological meas- urements to CNC phase behavior.
Birefringence
Stress decomposition
Self-assembly phases
Rheology
Fourier-transform rheology
CNC water suspensions
Cellulose nanocrystals (CNCs)
Author
Sylwia Wojno
Chalmers, Industrial and Materials Science, Engineering Materials
Wallenberg Wood Science Center (WWSC)
Mina Fazilati
Chalmers, Industrial and Materials Science, Engineering Materials
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Malmö university
Tiina Nypelö
Wallenberg Wood Science Center (WWSC)
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Gunnar Westman
Wallenberg Wood Science Center (WWSC)
Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry
Roland Kádár
Chalmers, Industrial and Materials Science, Engineering Materials
Wallenberg Wood Science Center (WWSC)
Cellulose
0969-0239 (ISSN) 1572882x (eISSN)
Vol. 29 7 3655-3673Advanced rheometry of CNC based systems
Wallenberg Wood Science Center (WWSC), 2019-01-01 -- 2024-12-31.
Subject Categories
Other Mechanical Engineering
Paper, Pulp and Fiber Technology
Other Materials Engineering
Areas of Advance
Materials Science
DOI
10.1007/s10570-022-04474-0