Local time-dependent microstructure of aging TEMPO nanofibrillated cellulose gel

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorKoochi, Hakimehen_US
dc.contributor.authorMac Intyre, Jonatanen_US
dc.contributor.authorViitanen, Leevien_US
dc.contributor.authorPuisto, Anttien_US
dc.contributor.authorMaleki-Jirsaraei, Nahiden_US
dc.contributor.authorAlava, Mikkoen_US
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.groupauthorComplex Systems and Materialsen
dc.contributor.organizationAlzahra Universityen_US
dc.contributor.organizationVTT Technical Research Centre of Finlanden_US
dc.date.accessioned2023-01-18T09:29:48Z
dc.date.available2023-01-18T09:29:48Z
dc.date.issued2023-01en_US
dc.description.abstractThe aging behavior of TEMPO-CNF suspensions is investigated using rheological measurements and experiments involving the free-falling solid sphere. The properties of CNF suspensions, which are formed of water and cellulose fibers with a large aspect ratio, are fundamentally different from those commonly known as model low-density gels. We characterize their aging utilizing SAOS rheometry following a period of shear rejuvenation, measuring the effect of aging time on the observed stress overshoot, and additionally measure the rheological hysteresis under continuous shear. In addition to such tests, which probe the sample at the bulk level, we study their local aging behavior via the Stokes' experiment. During SAOS, the aging of the material results in a logarithmic growth of the elastic modulus over the first 50 minutes. In the Stokes' experiment, depending on the sphere size, we find a systematic decrease in the sphere velocity with aging times up to 16 days and identify a range of intermittent particle motion. Based on our experimental evidence, we propose that the aging effect within the TEMPO-CNFs occurs due to the restructuring of fibrous elements by Brownian diffusion and that the aging of the system does not develop homogeneously across the whole sample as a consequence of the wide size distribution of CNFs. Finally, we note that this may be one of the primary reasons why the rheological data on even the same batch of CNFs show a large scatter.en
dc.description.versionPeer revieweden
dc.format.extent14
dc.format.extent61-74
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationKoochi, H, Mac Intyre, J, Viitanen, L, Puisto, A, Maleki-Jirsaraei, N & Alava, M 2023, ' Local time-dependent microstructure of aging TEMPO nanofibrillated cellulose gel ', Cellulose, vol. 30, no. 1, pp. 61-74 . https://doi.org/10.1007/s10570-022-04900-3en
dc.identifier.doi10.1007/s10570-022-04900-3en_US
dc.identifier.issn0969-0239
dc.identifier.issn1572-882X
dc.identifier.otherPURE UUID: f0b9adef-4139-4a82-a571-3f6d76099a65en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/f0b9adef-4139-4a82-a571-3f6d76099a65en_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85141068138&partnerID=8YFLogxKen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/98114149/Local_time_dependent_microstructure_of_aging_TEMPO_nanofibrillated_cellulose_gel.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/119000
dc.identifier.urnURN:NBN:fi:aalto-202301181356
dc.language.isoenen
dc.publisherSPRINGER
dc.relation.ispartofseriesCelluloseen
dc.relation.ispartofseriesVolume 30, issue 1en
dc.rightsopenAccessen
dc.subject.keywordTEMPO-CNFsen_US
dc.subject.keywordAgingen_US
dc.subject.keywordThixotropyen_US
dc.subject.keywordRheologyen_US
dc.subject.keywordSphere settlingen_US
dc.subject.keywordRHEOLOGICAL PROPERTIESen_US
dc.subject.keywordAQUEOUS SUSPENSIONSen_US
dc.subject.keywordYIELD-STRESSen_US
dc.subject.keywordMOTIONen_US
dc.subject.keywordOXIDATIONen_US
dc.subject.keywordSPHEREen_US
dc.subject.keywordFLOWen_US
dc.titleLocal time-dependent microstructure of aging TEMPO nanofibrillated cellulose gelen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion

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