Microstructure and Millimeter-Wave Attenuation Performance of Exfoliated Graphite with Different Expanding Volume

Ji Jin Zhao; Xiao Xia Li; Yu Xiang Guo; De Yue Ma; Li Yang

doi:10.4028/www.scientific.net/KEM.609-610.3

Paper Titles

Preface

Microstructure and Millimeter-Wave Attenuation Performance of Exfoliated Graphite with Different Expanding Volume
p.3

Influence on Friction Material Performance of Nano-MMT Composites of PF by In Situ Method
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Effects of Different Preparation Parameters on the Properties of MAO Coatings
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Characterization of Ag-TiO₂ Electronic Structures and Nanotubes Based on First-Principles Calculation
p.20

Improved Study on the Performance of Polyacrylamide/Attapulgite Clay Composite Material Removing Copper (II) Ions from Aqueous Solution
p.26

The Experiment Research of Gas-Assisted Ion Etching Nanograting
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Design and Fabrication of a Micro Spring with Steel Structures for the Microtensile Testing of Thin Films
p.39

Comparative Photocatalytic Properties of Cu₂O from Octahedron to Sphere Structures
p.45

HomeKey Engineering MaterialsKey Engineering Materials Vols. 609-610Microstructure and Millimeter-Wave Attenuation...

Microstructure and Millimeter-Wave Attenuation Performance of Exfoliated Graphite with Different Expanding Volume

Abstract:

Exfoliated graphite with different expanding volume (EV) was prepared by two-step intercalation, in which the mixture of nitric acid and phosphoric acid, and that of nitric acid and acetic acid were employed as intercalating agent step by step, and potassium permanganate was used as oxidant. Its microstructure was analyzed by scanning electron microscope, and its millimeter-wave attenuation performance was measured by a static method. The results show that the exfoliated graphite forms more microcellular structures and its layers become thinner with the increasing of EV, the interlayers are fully opened and there are more tiny graphite flakes with size distribution between several microns and several ten microns. The millimeter-wave attenuation performance enhances with the increasing of EV, and the 3mm wave attenuation value rises from 5.7dB to 8.68dB When EV increases from 233ml/g to 450ml/g, which is mainly attributed to the full expansion of exfoliated graphite to form larger scattering cross section and the absorption of more tiny graphite flakes with size distribution between several microns and several ten microns.

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Periodical:

Key Engineering Materials (Volumes 609-610)

Pages:

3-7

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.609-610.3

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Online since:

April 2014

Authors:

Ji Jin Zhao, Xiao Xia Li, Yu Xiang Guo, De Yue Ma, Li Yang

Keywords:

Attenuation Performance, Exfoliated Graphite, Expanding Volume, Microstructure, Millimeter-Wave

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