Pore structure and fractal characteristics of activated carbon fibers characterized by using HRTEM.

The pore microstructures in two viscouse rayon-based ACF samples were characterized by nitrogen adsorption and HRTEM. For TEM, a two-dimensional fast Fourier transform (FFT) of the original TEM images was performed, and pores in different size ranges were extracted by the inverse FFT (IFFT) operation. The surface fractal dimensions of the samples were evaluated by using both N(2) adsorption and TEM image analysis. The results show that TEM can portray the shapes of the pore, and it can give a quantitative evaluation of surface irregularity that is consistent with nitrogen adsorption results.

[1]  Huang,et al.  Influence of Calcination Procedure on Porosity and Surface Fractal Dimensions of Silica Xerogels Prepared under Different Evaporation Conditions. , 2000, Journal of colloid and interface science.

[2]  M. Dresselhaus,et al.  Visualized observation of pores in activated carbon fibers by HRTEM and combined image processor , 1998 .

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

[4]  Peter Pfeifer,et al.  Fractal Analysis and Surface Roughness of Nonporous Carbon Fibers and Carbon Blacks , 1994 .

[5]  Bidyut Baran Chaudhuri,et al.  An efficient approach to estimate fractal dimension of textural images , 1992, Pattern Recognit..

[6]  Wu,et al.  Multilayer adsorption on a fractally rough surface. , 1989, Physical review letters.

[7]  Peter Pfeifer,et al.  Molecular fractal surfaces , 1984, Nature.

[8]  Peter Pfeifer,et al.  Chemistry in noninteger dimensions between two and three. I. Fractal theory of heterogeneous surfaces , 1983 .

[9]  G. Sandí,et al.  Determination of fractal dimensions of solid carbons from gas and liquid phase adsorption isotherms , 2000 .

[10]  D. Do,et al.  The preparation of active carbons from coal by chemical and physical activation , 1996 .

[11]  A. Ōya,et al.  Formation of mesopores in phenolic resin-derived carbon fiber by catalytic activation using cobalt , 1995 .

[12]  J. Economy,et al.  Elucidating the pore structure of activated carbon fibers through direct imaging using scanning tunneling microscopy (STM) , 1995 .

[13]  Motoyuki Suzuki.  Activated carbon fiber: Fundamentals and applications , 1994 .

[14]  M. Jaroniec,et al.  Surface fractal dimension of microporous carbon fibres by nitrogen adsorption , 1991 .

[15]  J. Fryer.  The micropore structure of disordered carbons determined by high resolution electron microscopy , 1981 .