中文摘要：

为研究黑碳气溶胶粒子在附着三甘醇后吸湿性的变化,通过采用反向扩散燃烧器制取黑碳气溶胶,并运用自主搭建的吸湿性串联差分电迁移率分析仪对黑碳气溶胶进行粒径筛选、热消解和三甘醇附着,同时结合扫描电镜仪和气溶胶质量分析仪观察分析黑碳气溶胶在附着三甘醇前后形态结构和吸湿性的变化.分别筛选粒径为100,200,300nm的黑碳气溶胶粒子进行了三甘醇附着模拟实验.实验结果表明,三甘醇附着能够改变黑碳气溶胶粒径和吸湿特性,在相同条件下黑碳气溶胶附着少量三甘醇后就能出现显著的粒径变化.由于三甘醇具有一定的吸水性且其表面张力小于相同室温条件下水的表面张力,因此附着了三甘醇的黑碳气溶胶在不同相对湿度条件下将会发生进一步的粒径变化.因而,大气中少量存在的三甘醇能够在一定程度上促进黑碳气溶胶微物理特性的改变,进而改变黑碳气溶胶对大气环境的影响.

英文摘要：

In this study,the effect of tri-ethylene glycol(TEG)coating on the hygroscopicity property of soot aerosol particle was investigated.Size-classified soot aerosol from an inverted diffusion burner was coated with TEG and its properties were characterized by mass-mobility measurements using a Hygroscopic Tandem Differential Mobility Analyzer(HTDMA)coupled with an Aerosol Particle Mass analyzer(APM).Additionally,the soot aerosol sample was characterized using Scanning Electron Microscopy(SEM).Different Particle sizes,including100nm,200nm and300nm,were selected into simulated TEG coating measurement.Significant restructuring of soot aggregates was observed in the presence of sub-nanometer layers of TEG.Due to the hygroscopic property of TEG and lower surface tension(σ)than water at room temperature,the presence of TEG made soot aggregates hygroscopic and further promoted their restructuring at higher relative humidity(RH).The condensation of small amounts of TEG may induce a significant restructuring of atmospheric soot aggregates,altering their properties and atmospheric impacts.