Issue 48, 2013

Study of viscoelastic properties of magnetic nanofluids: an insight into their internal structure

Abstract

Three magnetic nanofluids were prepared as colloidal suspensions in ethylene glycol using two types of Fe3O4 ferrimagnetic nanoparticles (MGMFs)—one of them commercial (CMGMFs) and the other synthesized in our laboratory (SMGMFs)—and from one type of Fe2O3 nanoparticle (HMF). Using a shear stress controlling rheometer, they were characterized in order to comparatively analyze their viscoelastic behavior and structure. Effects of magnetic particle size and nature on elastic and viscous moduli were determined. The static yield stress and the percolation concentration were also obtained. The fractal dimension (Df) was estimated from the suspension static yield-stress and volume fraction (ϕ) dependence, and was determined to be Df ≈ 2.3 for SMGMFs and CMGMFs, and Df ≈ 1.5 for HMFs. The corresponding aggregation models and structures were discussed. Finally, master curves were obtained for the magnetic fluids under study, which provide valuable information to estimate the material response for any concentration.

Graphical abstract: Study of viscoelastic properties of magnetic nanofluids: an insight into their internal structure

Article information

Article type
Paper
Submitted
17 Jul 2013
Accepted
16 Oct 2013
First published
18 Oct 2013

Soft Matter, 2013,9, 11690-11698

Study of viscoelastic properties of magnetic nanofluids: an insight into their internal structure

M. J. Pastoriza-Gallego, M. Pérez-Rodríguez, C. Gracia-Fernández and M. M. Piñeiro, Soft Matter, 2013, 9, 11690 DOI: 10.1039/C3SM51952J

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