在酸含量不同的原材料中,通过爆轰的方法制备纳米石墨粉,并利用BET方程以及BJH方法对所得纳米石墨粉进行比表面积和孔径分布分析.分析结果表明,所得爆轰产物中有的比表面积大致为天然鳞片石墨的5.3～9.2倍,而且随酸含量的增大逐渐增大,产物的等温线中存在吸附滞后现象.其中,增大的比表面积主要由分布在3 nm至7 nm之间的孔引起的,而且在爆轰后,孔径4 nm左右的孔,其数量达到最大值.通过对纳米石墨粉的研究,分析了酸在爆轰过程中的积极作用,并为纳米石墨粉的进一步应用提供了结构信息.%N2 adsorption/desorption isotherms and pore diameter distribution of the porous graphite nanopowders,prepared by detonation splitting technique with different acid content in raw materials,were analyzed using Brunauer-Emmet-Teller(BET) equation and Barrett-Joyner-Halenda(BJH) method.The results indicate that there exists hysteresis phenomenon in the product isotherms and the corresponding BET surface area is 5.3～9.2 times of the natural flake graphite which is increasing with the acid content in raw materials.The difference of the BET surface area among the detonation soot is mainly caused by the pore of which diameter distributes between 3 nm and 7 nm.Moreover,the amount of the pore size at about 4 nm arrived at the maximum after detonation.In addition,the research provides sorption capacity information for application and at the same time it also proves that acid has perfect impact on preparing graphite nanopowders.
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