Fractional rheology of colloidal hydrogels with cellulose nanofibers

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Cellulose, Volume 31, issue 3, pp. 1545-1558
Abstract: Colloidal gels are soft solids composed of particles dispersed in a fluid phase. Their rheological behavior highly depends on the particle concentration, but establishing a relationship can be challenging. This article showcases the potential of fractional rheology to model and predict linear viscoelastic responses of colloidal hydrogels containing TEMPO-oxidized cellulose nanofibers. Cellulose nanofiber hydrogels are soft solids whose rheology is directly related to the particle concentration. Therefore, this work defined the rheological behavior of the hydrogels using a fractional order derivative analytically solved to determine rheological responses in frequency, stress relaxation, and creep. Using two parameters, it evaluated the rheology of cellulose nanofiber hydrogels and established tests that predict rheological behaviors for given particle concentrations. The findings suggested that the fractional approach could become a standard method for characterizing cellulose nanofiber hydrogels in the reported concentration regime. The two parameters of the fractional model build a comparison framework to assess the rheology of different viscoelastic materials. Graphic abstract: [Figure not available: see fulltext.]
Funding Information: Open Access funding provided by Aalto University. I.M-V. thanks to the Finnish Ministry of Education and Culture for financial support via its Finland Fellowship scholarship program. M.J.A. and J.K. thank FinnCERES flagship (151830423), Business Finland (211835), and Future Makers programs. M.J.A., T.M. and I.M-V. thank Business Finland (211909). Publisher Copyright: © 2024, The Author(s).
Cellulose nanofibers, Colloidal gel, Fractional rheology, Linear viscoelasticity, Scott-Blair model
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Miranda-Valdez, I Y, Sourroubille, M, Mäkinen, T, Puente-Córdova, J G, Puisto, A, Koivisto, J & Alava, M J 2024, ' Fractional rheology of colloidal hydrogels with cellulose nanofibers ', Cellulose, vol. 31, no. 3, pp. 1545-1558 .