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Equilibrium Composition of Aerosol Particles

Equilibrium Composition of Aerosol Particles. Equilibrium: What are x X , x Y , and x Z ?. Some time scale. Z. X. New particle. Y. p B. p B. p A. p A. 0. 0. 1. 1. x A. x A. Ideal and Non-Ideal Behavoir of Solutions. Question.

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Equilibrium Composition of Aerosol Particles

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  1. Equilibrium Composition of Aerosol Particles Equilibrium: What are xX, xY, and xZ? Some time scale Z X New particle Y

  2. pB pB pA pA 0 0 1 1 xA xA Ideal and Non-Ideal Behavoir of Solutions

  3. Question Consider an air parcel at T = 300 K and 30% RH with 20 ppb HNO3 and 20 ppb NH3 in the gas-phase. Will NH4NO3 particles form? If so, what is the NH4NO3 aerosol mass concentration if no other particulate matter exists? Assume only solid particles (no aqueous solutions).

  4. Deliquescence – Efflorescence of a Single Component System (NaCl) efflorescence deliquescence Tang, JGR-D 1997

  5. Gsolution Solid favored Gsolid Solution favored DRH Free Energy of Deliquescence - Efflorescence Gibbs Free Energy RH

  6. Evolution of Water Activity in Atmospheric Particle Often requires knowledge of RH-histroy RH>80% RH<40% RH=70% RH=80% Ocean Land

  7. Deliquesence-Efflorescence of Complex Compositions Lightstone, et al. JPC 2000 Schlenker, et al. JPC 2005

  8. Kelvin Effect: Physical Cartoon Equilibrium vapor pressure is higher over a curved surface than a flat one. Important for nucleation of new particles, lifetime of small droplets.

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