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

Abstract:

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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.

Info:

Periodical:

Advanced Materials Research (Volumes 295-297)

Edited by:

Pengcheng Wang, Liqun Ai, Yungang Li, Xiaoming Sang and Jinglong Bu

Pages:

93-97

DOI:

10.4028/www.scientific.net/AMR.295-297.93

Citation:

Q. Zhang et al., "Preparation of Magnetic Expanded Graphite by Sol-Gel Method and its Electromagnetic Properties", Advanced Materials Research, Vols. 295-297, pp. 93-97, 2011

Online since:

July 2011

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Price:

$35.00

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