Understanding ion-induced assembly of cellulose nanofibrillar gels through shear-free mixing and in situ scanning-SAXS

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Understanding ion-induced assembly of cellulose nanofibrillar gels through shear-free mixing and in situ scanning-SAXS

Rosén, Tomas, 1985- (author): KTH,Fiberprocesser,Wallenberg Wood Science Center,Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, USA;Department of Fiber and Polymer Technology, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;Wallenberg Wood Science Center, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden

Wang, Ruifu (author): Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, USA

He, HongRui (author): Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, USA

Zhan, Chengbo (author): Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, USA

Chodankar, Shirish (author): National Synchrotron Light Source II, Brookhaven National Lab, Upton, NY, USA

Hsiao, Benjamin S. (author): Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, USA

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2021
2021
English.
In: Nanoscale Advances. - : Royal Society of Chemistry (RSC). - 2516-0230. ; 3:17, s. 4940-4951

Related links:: https://doi.org/10.1...; show more...; https://pubs.rsc.org...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

During the past decade, cellulose nanofibrils (CNFs) have shown tremendous potential as a building block to fabricate new advanced materials that are both biocompatible and biodegradable. The excellent mechanical properties of the individual CNF can be transferred to macroscale fibers through careful control in hydrodynamic alignment and assembly processes. The optimization of such processes relies on the understanding of nanofibril dynamics during the process, which in turn requires in situ characterization. Here, we use a shear-free mixing experiment combined with scanning small-angle X-ray scattering (scanning-SAXS) to provide time-resolved nanoscale kinetics during the in situ assembly of dispersed cellulose nanofibrils (CNFs) upon mixing with a sodium chloride solution. The addition of monovalent ions led to the transition to a volume-spanning arrested (gel) state. The transition of CNFs is associated with segmental aggregation of the particles, leading to a connected network and reduced Brownian motion, whereby an aligned structure can be preserved. Furthermore, we find that the extensional flow seems to enhance the formation of these segmental aggregates, which in turn provides a comprehensible explanation for the superior material properties obtained in shear-free processes used for spinning filaments from CNFs. This observation clearly highlights the need for different assembly strategies depending on morphology and interactions of the dispersed nanoparticles, where this work can be used as a guide for improved nanomaterial processes.

Subject headings

NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Keyword

Nanofibers
nanostructures
X-ray scattering
SAXS
flow
nanoscale assemblies
Fiber- och polymervetenskap
Fibre and Polymer Science
Material and Nano Physics
Material- och nanofysik

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ref (subject category)
art (subject category)

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By the author/editor: Rosén, Tomas, 19 ...; Wang, Ruifu; He, HongRui; Zhan, Chengbo; Chodankar, Shiri ...; Hsiao, Benjamin ...

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NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Physical Chemist ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

Articles in the publication: Nanoscale Advanc ...

By the university: Royal Institute of Technology

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