Local time-dependent microstructure of aging TEMPO nanofibrillated cellulose gel

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorKoochi, Hakimeh
dc.contributor.authorMac Intyre, Jonatan
dc.contributor.authorViitanen, Leevi
dc.contributor.authorPuisto, Antti
dc.contributor.authorMaleki-Jirsaraei, Nahid
dc.contributor.authorAlava, Mikko
dc.contributor.departmentDepartment of Applied Physics
dc.contributor.departmentComplex Systems and Materials
dc.contributor.departmentVTT Technical Research Centre of Finland
dc.contributor.departmentAlzahra University
dc.date.accessioned2023-01-18T09:29:48Z
dc.date.available2023-01-18T09:29:48Z
dc.date.issued2023-01
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/pdf
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/s10570-022-04900-3
dc.identifier.issn0969-0239
dc.identifier.issn1572-882X
dc.identifier.otherPURE UUID: f0b9adef-4139-4a82-a571-3f6d76099a65
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/f0b9adef-4139-4a82-a571-3f6d76099a65
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85141068138&partnerID=8YFLogxK
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/98114149/Local_time_dependent_microstructure_of_aging_TEMPO_nanofibrillated_cellulose_gel.pdf
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-CNFs
dc.subject.keywordAging
dc.subject.keywordThixotropy
dc.subject.keywordRheology
dc.subject.keywordSphere settling
dc.subject.keywordRHEOLOGICAL PROPERTIES
dc.subject.keywordAQUEOUS SUSPENSIONS
dc.subject.keywordYIELD-STRESS
dc.subject.keywordMOTION
dc.subject.keywordOXIDATION
dc.subject.keywordSPHERE
dc.subject.keywordFLOW
dc.titleLocal time-dependent microstructure of aging TEMPO nanofibrillated cellulose gelen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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