Phase transitions of cellulose nanocrystal suspensions from nonlinear oscillatory shear
Artikel i vetenskaplig tidskrift, 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)

Författare

Sylwia Wojno

Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial

Wallenberg Wood Science Center (WWSC)

Mina Fazilati

Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Malmö universitet

Tiina Nypelö

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Tiina Nypelö Group

Gunnar Westman

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi och kemiteknik, Kemi och biokemi

Roland Kádár

Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial

Wallenberg Wood Science Center (WWSC)

Cellulose

0969-0239 (ISSN)

Vol. In press

Advanced rheometry of CNC based systems

Wallenberg Wood Science Center (WWSC), 2019-01-01 -- 2024-12-31.

Ämneskategorier

Annan maskinteknik

Pappers-, massa- och fiberteknik

Annan materialteknik

Styrkeområden

Materialvetenskap

DOI

10.1007/s10570-022-04474-0

Mer information

Senast uppdaterat

2022-03-10