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Indexed by:Journal Papers

Date of Publication:2015-12-01

Journal:APPLIED SURFACE SCIENCE

Included Journals:SCIE、EI、Scopus

Volume:357

Page Number:2131-2135

ISSN No.:0169-4332

Key Words:Cobalt ferrite; Graphene oxide; Nanocomposites; Sonochemical synthesis; Magnetorheological properties

Abstract:In this study, cobalt ferrite/graphene oxide (CoFe2O4/GO) nanocomposites were synthesized successfully by a facile sonochemical method. The microstructure and physical properties of CoFe2O4/GO nanocomposites were investigated in detail by TEM, XRD and SQUID. It was found that GO nanosheets were fully exfoliated and decorated homogeneously with CoFe2O4 nanoparticles having diameters of 8-15 nm. The field-dependent magnetization curve indicated superparamagnetic behavior of as-prepared CoFe2O4/GO with saturation magnetization (Ms) of 34.9 emu/g at room temperature. The ferrofluid was prepared by the obtained CoFe2O4/GO with 25 wt% particles and its magnetorheological (MR) properties were tested using a Physica MCR301 rheometer fitted with a magneto-rheological module. The CoFe2O4/GO-based ferrofluid exhibited typical MR effect with increasing viscosity, shear stress and yield stress depending on the applied magnetic field strength. (C) 2015 Elsevier B.V. All rights reserved.