Multiscale flow alignment in cellulose nanocrystals controlled by surface topology
Artikel i vetenskaplig tidskrift, 2026
We address how surface topology controls the multiscale flow alignment of cellulose nanocrystal (CNC) suspensions using a single in-situ experiment that combines rheology, polarized light imaging (PLI), and small-angle X-ray scattering (SAXS). Across a series of azetidinium-based dialkyl linker topologies, we resolve the propagation of alignment from the mesoscale (PLI) to the nanoscale (SAXS). While pristine CNC suspensions exhibit nearly-simultaneous onset of mesoscale birefringence and nanoscale alignment, surface-modified systems show a pronounced decoupling between these processes. In particular, the appearance of the Maltese-cross pattern in PLI systematically precedes detectable nanoscale alignment in SAXS. This is strongly dependent on linker topology. Extending the analysis beyond the Hermans parameter, S2, to higher-order anisotropy parameters and benchmarking their evolution against a generalized Maier-Saupe-type anisotropy distribution function, we show that higher-order anisotropy parameters qualitatively distinguish alignment regimes that are indistinguishable from S2 alone. The work establishes linker topology as a controlling variable for multiscale flow alignment in CNC systems and highlights the higher-order character of their alignment behavior.
Small-angle x-ray scattering
Polarized light imaging
Rheology
Cellulose nanocrystals
Surface linkers
Azedidinium salts
Författare
Ases Akas Mishra
Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial
Amit Kumar Sonker
Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial
Teknologian Tutkimuskeskus (VTT)
Kesavan Sekar
Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial
Marko Bek
Lund Institute of Advanced Neutron and X-ray Science (LINXS)
Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial
Max IV-laboratoriet
Ann Terry
Max IV-laboratoriet
Lund Institute of Advanced Neutron and X-ray Science (LINXS)
Kim Nygård
Lund Institute of Advanced Neutron and X-ray Science (LINXS)
Max IV-laboratoriet
Stuart Ansell
Lund Institute of Advanced Neutron and X-ray Science (LINXS)
Max IV-laboratoriet
Gunnar Westman
Chalmers, Kemi och kemiteknik, Kemi och biokemi
Roland Kádár
Computational Mechanics and Materials Engineering
Lund Institute of Advanced Neutron and X-ray Science (LINXS)
Max IV-laboratoriet
Journal of Colloid and Interface Science
00219797 (ISSN) 10957103 (eISSN)
Vol. 723 140913Styrkeområden
Nanovetenskap och nanoteknik
Produktion
Materialvetenskap
Ämneskategorier (SSIF 2025)
Den kondenserade materiens fysik
Annan fysik
Fysikalisk kemi
DOI
10.1016/j.jcis.2026.140913
PubMed
42341728