Determination and analysis of specific surface area and pore structure of graphite fibers

To quantitatively describe and analyze specific surface area and pore structure of graphite fibers,in this paper,nitrogen adsorption-desorption isotherms of graphite fibers were measured by low temperature nitrogen adsorption method at liquid nitrogen temperature and different pressures.It showed that graphite fibers are microporous material which contains a large number of microporous and a few of mesoporous;the BET specific surface area,total pore volume and average pore size of graphite fibers were 541.00m2/g,0.2436cm3/g and 1.8010nm,respectively,and the specific surface area,pore volume and pore diameter of its microporous were 535.53m2 / g,0.2331cm3/g and 0.9896nm,respectively;there is a narrow pore size distribution of graphite fibers,which are a large number of microporous about 1.4nm and a few of mesoporous about 2.0-7.7nm,and the microporous is the greatest contribution to the specific surface area and the pore volume.