中文摘要：

应用场发射扫描电镜（FESEM）和热重分析仪（TGA）等仪器及分形理论，研究柴油机高低负荷工况下不同粒径级颗粒物的表观形态及对有机可溶成分（SOF）吸附能力的影响。研究结果表明：高负荷工况下，随粒径级减小，SOF含量从20．31％增长到37．90％。由分形理论计算得到的盒维数亦对应地呈现增大趋势，而在相同粒径级下，由于低负荷工况时吸附较多的SOF使颗粒物粘结更紧密，其盒维数也大于高负荷工况。

英文摘要：

The apparent morphology of diesel PM with various particle sizes and its effect on the adsorption ability for soluble organic fractions were investigated using field emission scanning microscope（FESEM）, thermo- gravimetric analyzer（TGA） and fractal theory at both high and low loads. Results show that the mass fraction of soluble organics increases from 20.31% to 37.90%with the decrease in particle size at high load. Correspondingly, the box dimension number calculated by fractal theory also presents an increasing tendency. Under the same particle size, the particle adhesion is more compact and the box dimension number at low load is larger than that at high load mainly due to the adsorption of more SOF at low load.