Nonlinear rheological characterization of cellulose nanocrystals based systems
Licentiate thesis, 2021
In this framework, the PhD project focuses on investigating the relevance of nonlinear material rheological parameters on flow-field CNC interactions. Two water based CNC systems were characterized in this licentiate.
The first was CNCs with a lower ionic strength able to self-assemble from an isotropic phase with increasing CNC concentration into biphasic and liquid crystalline phases. The second one, CNCs with higher ionic strength, did not self-assemble. Instead, CNC suspensions with a higher sulfate content agglomerate into isotropic and isotropic gel phases. As nonlinear rheological characterization methods Fourier-Transform Rheology (FT-Rheology) and stress decomposition analysis were performed, to our knowledge, for the first time on the CNC systems analyzed. To investigate the dependence of concentration on self-assembled phase transitions in CNC suspensions, the rheological analysis was complemented by Rheo-PLI.
Chalmers, Industrial and Materials Science, Engineering Materials
Other Chemistry Topics
Areas of Advance
Nordanvinden/Sunnanvinden, Hörsalsvägen 5
Opponent: Dr Tiffany Abitbol, Senior Researcher at RISE Bioeconomy