# Viscous Rheological Behavior of Nanosuspensions of Fumed Silica Nanoparticles and Cellulose Nanocrystals

## 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.

## Key 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 became more shear-thinning with the increases in N20 and NCC concentrations. The shear-thinning of suspensions was due to two different mechanisms: the orientation of rod-shaped cellulose nanocrystals in the flow direction with the increase in shear rate and the break-up of large agglomerates of fumed silica aggregates with the increase in shear rate.