TY - JOUR ID - 10.1016/S1001-0742(13)60378-2 TI - Hygroscopicity and optical properties of alkylaminium sulfates AU - Dawei Hu AU - Chunlin Li AU - Hui Chen AU - Jianmin Chen AU - Xingnan Ye AU - Ling Li AU - Xin Yang AU - Xinming Wang AU - Abdelwahid Mellouki and Zhongyang Hu VL - 26 IS - 1 PB - SP - 37 EP - 43 PY - JF - Journal of Environmental Sciences JA - J. Environ. Sci. UR - http://www.jesc.ac.cn/jesc_en/ch/reader/view_abstract.aspx?file_no=2014260105&flag=1 KW - hygroscopicity;optical properties;alkylaminium sulfates KW - hygroscopicity;optical properties;alkylaminium sulfates AB - The hygroscopicity and optical properties of alkylaminium sulfates (AASs) were investigated using a hygroscopicity tandem differential mobility analyzer coupled to a cavity ring-down spectrometer and a nephelometer. AAS particles do not exhibit a deliquescence phenomenon and show a monotonic increase in diameter as the relative humidity (RH) ascends. Hygroscopic growth factors (GFs) for 40, 100 and 150 nm alkylaminium sulfate particles do not show an apparent Kelvin effect when RH is less than 45%, whereas GFs of the salt aerosols increase with initial particle size when RH is higher than 45%. Calculation using the Zdanovskii-Stokes-Robinson mixing rule suggests that hygroscopic growth of triethylaminium sulfate-ammonium sulfate mixtures is non-deliquescent, occurring at very low RH, implying that the displacement of ammonia by amine will significantly enhance the hygroscopicity of (NH4)2SO4 aerosols. In addition, light extinction of AAS particles is a combined effect of both scattering and absorption under dry conditions, but is dominated by scattering under wet conditions. ER -