Water Adsorption vs Phase Transition of Aerosols Monitored by a Quartz Crystal Microbalance.

ABSTRACT: A quartz crystal microbalance (QCM) with a high sensitivity of 0.1 ng was applied to monitor the oscillation frequency variation (Δf) of standard single species, two-component systems with typical ambient aerosol compositions, and ambient aerosol filter samples as a function of relative humidity (RH) and determine their deliquescence RH (DRH) and phase transition. Δf is associated with the adsorption or desorption process of water molecules for solid samples and physical properties of the sample film during solid-to-aqueous phase transition (deliquescence). During the pre-deliquescence stage, the water adsorption process led to the increased mass with decreasing Δf, especially for the hydrates such as MgCl₂ and Ca(NO₃)₂, which have more

SUBMITTER: Chao HJ 

PROVIDER: S-EPMC7745410 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature