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  4. Propagation of Orientation Across Lengthscales in Sheared Self-Assembling Hierarchical Suspensions via Rheo-PLI-SAXS
 
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research article

Propagation of Orientation Across Lengthscales in Sheared Self-Assembling Hierarchical Suspensions via Rheo-PLI-SAXS

Ghanbari, Reza
•
Terry, Ann
•
Wojno, Sylwia
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December 25, 2024
Advanced Science

Simultaneous rheological, polarized light imaging, and small-angle X-ray scattering experiments (Rheo-PLI-SAXS) are developed, thereby providing unprecedented level of insight into the multiscale orientation of hierarchical systems in simple shear. Notably, it is observed that mesoscale alignment in the flow direction does not develop simultaneously across nano-micro lengthscales in sheared suspensions of rod-like chiral-nematic (meso) phase forming cellulose nanocrystals. Rather, with increasing shear rate, orientation is observed first at mesoscale and then extends to the nanoscale, with influencing factors being the aggregation state of the hierarchy and concentration. In biphasic systems, where an isotropic phase co-exists with self-assembled liquid crystalline mesophase domains, the onset of mesodomain alignment towards the flow direction can occur at shear rates nearing one decade before a progressive increase in preferential orientation at nanoscale is detected. If physical confinement prevents the full formation of a cholesteric phase, mesoscale orientation occurs in shear rate ranges that correspond to de-structuring at nanoscale. Interestingly, nano- and mesoscale orientations appear to converge only for biphasic suspensions with primary nanoparticles predominantly made up of individual crystallites and in a high-aspect ratio nematic-forming thin-wall nanotube system. The nano-micro orientation propagation is attributed to differences in the elongation and breakage of mesophase domains.

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Type
research article
DOI
10.1002/advs.202410920
Web of Science ID

WOS:001382676900001

PubMed ID

39721031

Author(s)
Ghanbari, Reza
•
Terry, Ann
•
Wojno, Sylwia
•
Bek, Marko
•
Sekar, Kesavan
•
Sonker, Amit
•
Nygard, Kim
•
Ghai, Viney
•
Bianco, Simona
•
Liebi, Marianne  
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Date Issued

2024-12-25

Publisher

WILEY

Published in
Advanced Science
Subjects

advanced rheological techniques

•

cellulose nanocrystals

•

liquid crystalline suspensions

•

multiscale orientation

•

polarized light imaging

•

small-angle X-ray scattering

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CAM-X  
FunderFunding(s)Grant NumberGrant URL

Stiftelsen Chalmers tekniska hgskola

2022143;20230947

Chalmers Foundation

2018-07152

Swedish Research Council

2018-04969

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Available on Infoscience
January 28, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/245823
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