Release Time:2019-03-09  Hits:

Indexed by: Journal Papers

Date of Publication: 2015-12-01

Journal: APPLIED SURFACE SCIENCE

Included Journals: Scopus、EI、SCIE

Volume: 357

Page Number: 2131-2135

ISSN: 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.