Abstract
In this work, the influence of cellulose nanofibers (CNFs) on the rheological behavior of silica-based shear-thickening fluid (STF) is investigated. CNFs of 150–200 nm in diameter were extracted from cotton fibers using a supermasscolloider. CNF-reinforced STF of different concentrations (0.1–0.3 wt.%) was prepared via an ultrasonication technique. The presence of CNFs and their interaction with the silica nanoparticles in the STF were analyzed using SEM and FTIR. The addition of a minute quantity of CNF to the STF (0.3% CNF-reinforced STF) caused a marked increase in the peak viscosity, from 36.8 (unmodified STF) to 139.0 Pa s (0.2% CNF-reinforced STF), and a concomitant decrease in the critical shear rate from 33.45 to 14.8 s−1 . The presence of a large number of hydroxyl groups on the CNFs enhanced their interaction with the nanoparticles via hydrogen bonding, which induced shear thickening. The mechanism of the interaction between silica nanoparticles and CNF was also demonstrated. Oscillatory dynamic rheological analysis showed that the addition of even a small amount of CNF led to higher elastic behavior in the system at lower shear rates. In contrast, a more viscous nature was demonstrated at higher angular frequencies. As the concentration of nanofibers in the STFs increased, the crossover point between storage and loss modulus shifted to higher angular frequencies, implying stronger interaction between the constituents of the STF. The dynamic viscosity profile of all samples also exhibited shear-thickening behavior.
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The research was financially supported by CSIR (Project No. 22/664/14/EMR-II) and DRDO (Project No. ST-13/TBR-1298).
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Ghosh, A., Chauhan, I., Majumdar, A. et al. Influence of cellulose nanofibers on the rheological behavior of silica-based shear-thickening fluid. Cellulose 24, 4163–4171 (2017). https://doi.org/10.1007/s10570-017-1440-5
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DOI: https://doi.org/10.1007/s10570-017-1440-5