Two new directions for the characterization of aerosol chemistry and dynamics will be reviewed in this presentation. In the first instance, a new single-particle dust accelerator/decelerator will be discussed.1 This apparatus allows the examination of the impact dynamics of micron and sub-micron-sized nanoparticles. The mass and charge of single nanoparticles can be measured using charge detection mass spectrometry and particles are then accelerated or decelerated to controlled final velocities for studies of particle impact with surfaces. Results on measurements of the coefficient of restitution for polystyrene latex spheres, tin nanoparticles, and ice and mixed ice/organic solute particles will be presented. Applications to contamination mitigation in semiconductor processing and validation of environmental and planetary probes will be discussed. In the second instance, a new electrodynamic balance apparatus optimized for the study of the spectroscopy and phase-change dynamics of aqueous particles relevant to sea-spray aerosol will be discussed. Approximately 50 micron sized droplets of model compounds are trapped with atmospheric control for the relative humidity, gas composition and temperature with this device. Initial measurements examining the translational diffusion of D2O through H2O in sucrose, citric acid and ternary sucrose-salt solutions will be presented, illustrating the extremely slow kinetics that are exhibited by highly viscous aerosol.

Aerosol spectroscopy and the dynamics of nanoparticle collisions

2019 Fall National Meeting

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