Preparation of Magnetic Expanded Graphite by Sol-Gel Method and its Electromagnetic Properties

Abstract:

In order to transform the diamagnetism of expanded graphite (EG) to ferrimagnetism and improve its electromagnetic interferential capability, nano γ-Fe₂O₃/EG magnetic composite materials was prepared by sol-gel and low temperature self-combustion technique. The as prepared samples were characterized by SEM, XRD and Magnetic hysteresis cycle test. The results indicated that the composite materials had ferrimagnetism property after the embedding of γ-Fe₂O₃, but the average conductivity of the composites decreases gradually with the increase of γ-Fe₂O₃. Different mixing ratio of ferrite gel and graphite intercalation compounds produced ferric oxide with different crystal form and shape. When the content of ferrite sol was low, spherical γ-Fe₂O₃ with the mean size of 31.69nm was formed, and spread unevenly on the surface and interformational micelles of EG. High content of ferrite sol (83wt%) produced more perfect crystal γ-Fe₂O₃ of pentahedron shape with the mean size of 44.68nm, and a few of α-Fe₂O₃ occurred which lead to the decline of the magnetic property of the composite materials.

• Periodical: Advanced Materials Research (Volumes 295-297)
• Pages: 93-97
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.295-297.93
• Online since: July 2011
• Authors: Qian Zhang, Jun Yan, Tian Peng Li, Jing Wang
• Keywords: Composite Material, Electromagnetic Properties, Magnetic Expanded Graphite, Nano γ-Fe₂O₃, Sol-Gel Technology

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