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Experimental studies of dynamic compression of cellulose pulp fibers
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0003-0723-5593
KTH, School of Engineering Sciences (SCI), Engineering Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-4236-2793
Wallenberg Wood Sci Ctr, S-11428 Stockholm, Sweden..
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences (SCI), Engineering Mechanics.ORCID iD: 0000-0002-2504-3969
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2023 (English)In: Sustainable Materials and Technologies, ISSN 2214-9937, Vol. 38, article id e00774Article in journal (Refereed) Published
Abstract [en]

The ability to control the structure of the wood-pulp fiber cell wall is an attractive means to obtain increased accessibility to the fiber interior, providing routes for functionalization of the fibers that support further processing and novel material concepts, e.g. improved degree of polymerization, nanofiltration as demonstrated in previous studies. It has been proposed that dynamic compression and decompression of the cellulose pulp fibers in the wet state make it possible to modify the cell wall significantly. We hypothesize that hydrostatic pressure exerted on fibers fully submerged in water will increase the accessibility of the fiber wall by penetrating the fiber through weak spots in the cell wall. To pursue this, we have developed an experimental facility that can subject wet cellulose pulp samples to a pressure pulse -10 ms long and with a peak pressure of -300 MPa. The experiment is thus specifically designed to elucidate the effect of a rapid high-pressure pulse passing through the cellulose sample and enables studies of changes in structural properties over different size ranges. Different characterization techniques, including Scanning electron microscopy, X-ray diffraction, and wide- and small-angle X-ray scattering, have been used to evaluate the material exposed to pulsed pressure. The mechanism of pressure build-up is estimated computationally to complement the results. Key findings from the experiments consider a decrease in crystallinity and changes in the surface morphology of the cellulose sample.

Place, publisher, year, edition, pages
Elsevier BV , 2023. Vol. 38, article id e00774
Keywords [en]
Cellulose fiber modification, Dynamic compression, Accessibility, Cell wall, High-pressure, X-ray scattering, Computations
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-341813DOI: 10.1016/j.susmat.2023.e00774ISI: 001122972200001Scopus ID: 2-s2.0-85179623066OAI: oai:DiVA.org:kth-341813DiVA, id: diva2:1823717
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QC 20240103

Available from: 2024-01-03 Created: 2024-01-03 Last updated: 2024-01-03Bibliographically approved

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Apazidis, NicholasLundell, FredrikSöderberg, Daniel

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Kulkarni, Rohan AjitApazidis, NicholasLundell, FredrikSöderberg, Daniel
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Fluid Mechanics and Engineering AcousticsLinné Flow Center, FLOWWallenberg Wood Science CenterEngineering MechanicsFiberprocesser
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Sustainable Materials and Technologies
Paper, Pulp and Fiber Technology

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