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Open Access Nano Express

Rheological non-Newtonian behaviour of ethylene glycol-based Fe2O3 nanofluids

María Jose Pastoriza-Gallego, Luis Lugo, José Luis Legido and Manuel M Piñeiro*

Author Affiliations

Departamento de Física Aplicada, Facultade de Ciencias, Universidade de Vigo, E-36310 Vigo, Spain

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Nanoscale Research Letters 2011, 6:560  doi:10.1186/1556-276X-6-560

Published: 25 October 2011

Abstract

The rheological behaviour of ethylene glycol-based nanofluids containing hexagonal scalenohedral-shaped α-Fe2O3 (hematite) nanoparticles at 303.15 K and particle weight concentrations up to 25% has been carried out using a cone-plate Physica MCR rheometer. The tests performed show that the studied nanofluids present non-Newtonian shear-thinning behaviour. In addition, the viscosity at a given shear rate is time dependent, i.e. the fluid is thixotropic. Finally, using strain sweep and frequency sweep tests, the storage modulus G', loss modulus G″ and damping factor were determined as a function of the frequency showing viscoelastic behaviour for all samples.

Keywords:
nanofluid; rheology; hematite; ferrofluids; storage modulus; loss modulus; nanoparticles; shear thinning