中文摘要：

采用热泳取样、高分辨率透射电镜和原子力显微镜，研究了CH4-O2预混火焰中火焰温度对碳烟颗粒纳观结构的影响规律．结果表明，低温火焰中生成的碳烟颗粒的微晶长度短，微晶片层杂乱无序，没有明确的中心，而高温火焰生成的碳烟颗粒的微晶片层明显增大，微晶尺寸变长，边缘更为清晰，有明显的同心片层组织结构．基本粒子平均粒径都随火焰高度（height above burner，HAB）的增加而增加，而随着火焰温度升高而减小．初生碳烟颗粒呈扁平状，随着玩。增加，碳烟颗粒由于生长渐趋成熟，并呈现为球形或椭球形，基本粒子粒径分布变宽且出现双峰分布．

英文摘要：

Soot particles formed in premixed methane-oxygen flames at the same C/O ratio were sampled on TEM grids and AFM （atomic force microscopy） substrates by thermophoretic sampling method, and the size distribution, morphological characterization and nanostructure of the nanoparticles are measured by HRTEM （high resolution trans- mission electron microscopy） and AFM. Results show that the nanoparticles formed in low temperature flames are of short and disordered lattice fringes, while those formed in high temperature flames show obvious concentric organi- zation or shell/core structure and are of longer and well-organized fringes. The size of primary particles decreases as flame temperature increases, but increases as HAB （height above burner） increases. AFM probing of the same particles shows that the nascent soot particles detected at 5 mm above the burner are extremely flattened in form and with a narrow size distribution, and with the increase OfHAB, they grow and the size distribution gets broadened.