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The structure of cellulose nanofibril networks at low concentrations and their stabilizing action on colloidal particles
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Fibre Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-1402-2679
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Coating Technology.ORCID iD: 0000-0003-4388-8970
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-1924-6954
KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences (SCI), Applied Physics, Biophysics.ORCID iD: 0000-0002-1850-5440
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2022 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 297, p. 120046-, article id 120046Article in journal (Refereed) Published
Abstract [en]

The structure and dynamics of networks formed by rod-shaped particles can be indirectly investigated by measuring the diffusion of spherical tracer particles. This method was used to characterize cellulose nanofibril (CNF) networks in both dispersed and arrested states, the results of which were compared with coarse-grained Brownian dynamics simulations. At a CNF concentration of 0.2 wt% a transition was observed where, below this concentration tracer diffusion is governed by the increasing macroscopic viscosity of the dispersion. Above 0.2 wt%, the diffusion of small particles (20-40 nm) remains viscosity controlled, while particles (100-500 nm) become trapped in the CNF network. Sedimentation of silica microparticles (1-5 mu m) in CNF dispersions was also determined, showing that sedimentation of larger particles is significantly affected by the presence of CNF. At concentrations of 0.2 wt%, the sedimentation velocity of 5 mu m particles was reduced by 99 % compared to pure water.

Place, publisher, year, edition, pages
Elsevier BV , 2022. Vol. 297, p. 120046-, article id 120046
Keywords [en]
Cellulose nanofibrils, Colloid stability, Simulations, Diffusion, Sedimentation, Models
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-319717DOI: 10.1016/j.carbpol.2022.120046ISI: 000860482300005PubMedID: 36184183Scopus ID: 2-s2.0-85137161224OAI: oai:DiVA.org:kth-319717DiVA, id: diva2:1704203
Note

QC 20221017

Available from: 2022-10-17 Created: 2022-10-17 Last updated: 2022-12-12Bibliographically approved

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Nordenström, MalinBenselfelt, TobiasHollertz, RebeccaWennmalm, StefanLarsson, Per A.Söderberg, DanielWågberg, Lars

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Nordenström, MalinBenselfelt, TobiasHollertz, RebeccaWennmalm, StefanLarsson, Per A.Söderberg, DanielWågberg, Lars
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Fibre TechnologyWallenberg Wood Science CenterCoating TechnologyFibre- and Polymer TechnologyScience for Life Laboratory, SciLifeLabBiophysicsVinnExcellence Center BiMaC InnovationLinné Flow Center, FLOWEngineering MechanicsFiberprocesser
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Carbohydrate Polymers
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