The experimental materials individually came from the soot formed in diffusion flame in natural gas, candle or butane, and a kind of bituminous coal coke was also taken as experimontal material.

• 实验材料为在扩散火炬中取样得到的天然气炭黑、蜡烛炭黑、丁烷火焰炭黑，同时还选用了一种烟煤焦炭。