Characterising exfoliated few-layer graphene interactions in co-processed nanofibrillated cellulose suspension via water retention and dispersion rheology

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-03-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
15
37-51
Series
Materials Science and Engineering B: Solid-State Materials for Advanced Technology, Volume 242
Abstract
Few-layer graphene has been produced by mechanical delamination of exfoliated and naturally obtained graphite in aqueous suspension using the dispersion and suspension properties of nanofibrillated cellulose (NFC). Various degrees of graphene platelet integrity were obtained depending upon the processing conditions and the optional adoption of surfactant to aid dispersion of the hydrophobic agglomerates of nanometre-thin carbon material. The presence of NFC in the suspension acts similarly to the presence of surfactant, increasing the hydrodynamic coupling between the particles and water as a function of processing time, regardless of the graphene-comprising source. By fitting the stress growth region in the stress-shear rate relation to a concatenated series of single exponential functions of shear rate, the power law exponent and suspension consistency parameters (n and k), within a shear rate-localised Herschel-Bulkley (HB) expression, provide a straightforward characteristic for monitoring the desired suspension coupling response, and hence a measure of product constancy.
Description
Keywords
Coprocessing graphite delamination in cellulose, Few-layer graphene, Graphene-cellulose-water interaction under flow, Micro/nanofibrillar cellulose, Power law shear response, Quality parameterisation
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Citation
Dimi-Misic , K , Phiri , J , Nieminen , K , Maloney , T & Gane , P 2019 , ' Characterising exfoliated few-layer graphene interactions in co-processed nanofibrillated cellulose suspension via water retention and dispersion rheology ' , Materials Science and Engineering B: Solid-State Materials for Advanced Technology , vol. 242 , pp. 37-51 . https://doi.org/10.1016/j.mseb.2019.03.001