Pore structure analysis of exfoliated graphite using image processing of scanning electron micrographs

Pore structure, distributions of area, length of major and minor axes, and aspect ratio of ellipsoidal pores, were examined on four exfoliated graphite samples, two being industrial samples and two laboratory-made ones, from a large number of scanning electron micrographs of fractured cross-sections of their worm-like particles by using image processing. The procedure to obtain fractured cross-section of exfoliated graphite particles was established. Two industrial samples showed distinct differences in distribution of pore area and also in those of the major and minor axis lengths. From laboratory samples, extending the residence time from 20 to 60 s at 1000°C made little effect on pore structure, with only a small increase in pore size. No difference in the distribution of aspect ratio was observed among the four samples.

[1]  Yasuhiro Yamada,et al.  TEM lattice images and their evaluation by image analysis for activated carbons with disordered microtexture , 1998 .

[2]  M. Dresselhaus,et al.  Analysis of pore structure of activated carbon fibers using high resolution transmission electron microscopy and image processing , 1995 .

[3]  M. Inagaki,et al.  Pore Analysis of Isotropic Graphite using Image Processing of Optical Micrographs , 1996 .

[4]  M. Inagaki,et al.  Quantitative assessment of pores in oxidized carbon spheres using scanning tunneling microscopy , 1999 .

[5]  Michio Inagaki,et al.  Exfoliated graphite from various intercalation compounds , 1991 .

[6]  M. Toyoda,et al.  Heavy oil sorption using exfoliated graphite: New application of exfoliated graphite to protect heavy oil pollution , 2000 .

[7]  M. Toyoda,et al.  Sorption of Heavy Oil into Exfoliated Graphite-Influence of Bulk Density and Pore for Sorption , 1999 .

[8]  M. Toyoda,et al.  Sorption and recovery of heavy oils by using exfoliated graphite Part I: Maximum sorption capacity , 2000 .

[9]  F. Kang,et al.  Electrochemical synthesis and characterization of formic acid-graphite intercalation compound , 1997 .

[10]  M. Toyoda,et al.  Sorption and recovery of heavy oils by using exfoliated graphite. Part III : Trials for practical applications , 2000 .

[11]  M. Toyoda,et al.  Sorption and recovery of heavy oil by using exfoliated graphite , 1998 .

[12]  F. Kang,et al.  Studies of Exfoliated Graphite (EG) for Heavy Oil Sorption , 2000 .

[13]  M. Toyoda,et al.  Sorption and recovery of heavy oils by using exfoliated graphite Part II: Recovery of heavy oil and recycling of exfoliated graphite , 2000 .