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发布时间：2019-03-09

论文类型：期刊论文

发表时间：2015-12-01

发表刊物：APPLIED SURFACE SCIENCE

收录刊物：Scopus、EI、SCIE

卷号：357

页面范围：2131-2135

ISSN号：0169-4332

关键字：Cobalt ferrite; Graphene oxide; Nanocomposites; Sonochemical synthesis; Magnetorheological properties

摘要：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.