FRACTAL ANALYSIS ON PORE STRUCTURE FOR ACTIVATED CARBON-FIBERS

Recently, the active carbon filter (ACF) has drawn attention because o f its usefulness in the electrical and electronics fields. To improve the quality of ACF, the microscopic structure of this material must be analyzed. One method is to observe the structure using a transmission electron microscope (TEM). Recently, the capability of the TEM has be en improved drastically. Not only can its molecular structure be obser ved but also numerous analytical equipment has been attached to it. AC F has been investigated by using a TEM, and it has been found that the ACF structure was so complex that quantitative analysis was impossibl e. Computer analysis of a TEM image has also been attempted. In this a nalysis, the TEM image was processed by the two-dimensional fast Fouri er transform and frequency analysis to investigate the distribution of the pore diameter of ACF. As a result, it was speculated that the por e shape was fractal. Then, it was shown that the contour of the pore c ross section was fractal and the fractal dimension was obtained. When the structure was too complex to analyze only by TEM analysis, the int roduction of the image processing method was effective.