Hygroscopic growth of ultrafine ammonium sulphate aerosol measured using an ultrafine tandem differential mobility analyzer
Tóm tắt
An ultrafine tandem differential mobility analyzer has been developed for measurements of the hygroscopicity of ultrafine aerosol particles, between 8 and 50 nm in mobility diameter. In this paper, the main operation features of the device are presented along with a detailed evaluation for the limits of its operation. The instrument is suitable for both laboratory‐generated and atmospheric aerosol measurements. Hygroscopic growth data are presented for ammonium sulphate particles in the ultrafine size range, and comparisons are made with both experimental literature data and with theory. The data include determination of hygroscopic growth curves, deliquescence behavior, and hysteresis. These data will find applications in studies of the formation and growth of atmospheric aerosols.
Từ khóa
Tài liệu tham khảo
Gurovich B. M., 1983, Koefficient poverhnostnogo natiazenia vodnih rastvorov K2CO3, KON, (NH4)2SO4 i NH4NO3, Zh. Prikl. Khim., 56, 2612
Pruppacher H. R., 1997, Microphysics of Clouds and Precipitation
Svenningsson I. B. Hygroscopic growth of atmospheric aerosol particles and its relation to nucleation scavenging in clouds Doctoral thesis Dep. of Nuclear Phys. Univ. of Lund Lund Sweden 1997.