Dual Stimuli-Responsive Smart Fluid of Graphene Oxide-Coated Iron Oxide/Silica Core/Shell Nanoparticles

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• 作者：Seungae Lee ; Jungchul Noh ; Seunghee Hong ; Yun Ki Kim ; Jyongsik Jang
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：April 26, 2016
• 年：2016
• 卷：28
• 期：8
• 页码：2624-2633
• 全文大小：716K
• 年卷期：0
• ISSN：1520-5002

文摘

The graphene oxide-coated iron oxide/silica core/shell nanoparticles (Fe₃O₄/SiO₂/GO NPs) are successfully fabricated and adopted as the dual stimuli-responsive smart fluid. The Fe₃O₄/SiO₂/GO NPs exhibit both electrorheological (ER) and magnetorheological (MR) characteristics, attributed to the SiO₂/GO layer in the shell part and Fe₃O₄ in the core part, respectively. Particularly, the ER efficiency of the Fe₃O₄/SiO₂/GO NPs-based ER fluid is ca. 191 at the applied electric field of 3 kV mm^–1. Moreover, the MR performance of the Fe₃O₄/SiO₂/GO NPs-based MR fluid is significantly enhanced up to 135-fold at the applied magnetic field of 1 T compared to the zero-field stress. Furthermore, it is remarkable that the Fe₃O₄/SiO₂/GO NPs represent high colloidal stability and outstanding antisettling property because of the electrostatic repulsion between oxygen functional groups on GO nanosheets and the relatively low density compared with other magnetic particles. Dual stimuli-responsive characteristics in addition to the excellent antisedimentation property of the Fe₃O₄/SiO₂/GO NPs-based smart fluid would provide a feasible candidate for practical applications.