Viscous Rheological Behavior of Nanosuspensions of Fumed Silica Nanoparticles and Cellulose Nanocrystals
Rajinder Pal, Hanie Alizadeh
TL;DR
This paper studies how mixtures of fumed silica and cellulose nanocrystals behave under shear stress, showing they become more fluid when stirred.
Contribution
The study reveals two distinct mechanisms causing shear-thinning behavior in mixed nanosuspensions.
Findings
Suspensions of fumed silica and cellulose nanocrystals exhibit non-Newtonian shear-thinning behavior.
The power-law model accurately describes the viscosity-shear rate relationship of the suspensions.
Shear-thinning is caused by nanocrystal orientation and fumed silica agglomerate breakup.
Abstract
The viscous rheological behavior of suspensions of mixtures of fumed silica nanoparticles (N20) and rod-shaped cellulose nanocrystals (NCC) were studied experimentally. The fumed silica concentration varied from 2 to 11.3 wt% and the NCC concentration varied from 0.99 to 6.73 wt%. The suspensions of pure fumed silica, pure NCC, and mixtures of N20 and NCC were non-Newtonian shear-thinning in nature. The viscosity versus shear rate data of all suspensions of pure and mixed additives could be described satisfactorily by a power-law model. The consistency and flow behavior indices of the suspensions were strongly dependent on the concentrations of both N20 and NCC. While the consistency index increased sharply with the increases in additive (N20 and NCC) concentrations, the flow behavior index generally decreased with the increases in N20 and NCC concentrations. Thus, the suspensions…
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Taxonomy
TopicsAdvanced Cellulose Research Studies · Polysaccharides and Plant Cell Walls · Lignin and Wood Chemistry