Temperature effects on sulfuric acid aerosol nucleation and growth : initial results from the TANGENT study
Date of Award
Master of Science (MS)
Arastoo Pour Biazar
Nucleation., Particles., Aerosols., Sulfuric acid.
New particle formation (NPF) consists of two steps: nucleation and growth. At present, mechanisms governing these processes are not well understood. Here, we report results obtained from the TANGENT (Tandem Aerosol Nucleation and Growth Environment Tube) experiments. The TANGENT apparatus enables us to study these processes independently. Our results show that lower temperatures enhance both the nucleation and growth rate of sulfuric acid particles. However, at temperatures below 268 K the effects of temperature on the nucleation rate become less significant, indicating that particle formation takes place via barrierless nucleation at lower temperatures. We examined the growth of newly formed particles under differing temperature conditions for nucleation and growth. Our results show that newly nucleated clusters formed at low temperatures can survive evaporation and grow in a warmer environment in the presence of SO2 and ozone, implying that some heterogeneous reactions involving nanoparticles affect their growth.
Tiszenkel, Lee, "Temperature effects on sulfuric acid aerosol nucleation and growth : initial results from the TANGENT study" (2019). Theses. 275.