Propagation of Orientation Across Lengthscales in Sheared Self-Assembling Hierarchical Suspensions via Rheo-PLI-SAXS
Artikel i vetenskaplig tidskrift, 2025
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.
rheology
ForMAX
multiscale analysis
small-angle x-ray scattering
polarized light imaging
MAX IV
combined rheological methods
CoSAXS
cellulose nanocrystals
hyphenated rheology
orientation
Författare
Reza Ghanbari
Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial
Max IV-laboratoriet
Ann Terry
Lund Institute of Advanced Neutron and X-ray Science (LINXS)
Max IV-laboratoriet
Sylwia Wojno
Wallenberg Wood Science Center (WWSC)
Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial
Marko Bek
Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial
Lund Institute of Advanced Neutron and X-ray Science (LINXS)
Kesavan Sekar
Wallenberg Wood Science Center (WWSC)
Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial
Kim Nygård
Lund Institute of Advanced Neutron and X-ray Science (LINXS)
Viney Ghai
Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial
Simona Bianco
University of Glasgow
Marianne Liebi
Chalmers, Fysik, Materialfysik
Aleksandar Matic
Chalmers, Fysik, Materialfysik
Gunnar Westman
Chalmers, Kemi och kemiteknik, Kemi och biokemi
Tiina Nypelö
Wallenberg Wood Science Center (WWSC)
Lund Institute of Advanced Neutron and X-ray Science (LINXS)
Roland Kádár
Lund Institute of Advanced Neutron and X-ray Science (LINXS)
Wallenberg Wood Science Center (WWSC)
Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial
Advanced Science
2198-3844 (ISSN) 21983844 (eISSN)
Vol. 12 7 2410920Advanced rheometry of CNC based systems
Wallenberg Wood Science Center (WWSC), 2019-01-01 -- 2024-12-31.
2D material-baserad teknologi för industriella applikationer (2D-TECH)
GKN Aerospace (2D-tech), 2021-01-01 -- 2024-12-31.
VINNOVA (2019-00068), 2020-05-01 -- 2024-12-31.
VINNOVA (2024-03852), 2023-11-01 -- 2029-12-31.
Development of a new rheometer system at MAX IV
Stiftelsen Chalmers tekniska högskola, 2019-03-01 -- 2021-12-31.
Max IV-laboratoriet, 2019-03-01 -- 2021-12-31.
Ämneskategorier (SSIF 2011)
Annan maskinteknik
Annan fysik
Nanoteknik
Annan materialteknik
Den kondenserade materiens fysik
Styrkeområden
Nanovetenskap och nanoteknik
Materialvetenskap
DOI
10.1002/advs.202410920