Viscosity of aqueous ammonium nitrate–organic particles: equilibrium partitioning may be a reasonable assumption for most tropospheric conditions DOI Creative Commons
Liviana K. Klein, Allan K. Bertram, Andreas Zuend

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(23), P. 13341 - 13359

Published: Dec. 3, 2024

Abstract. The viscosity of aerosol particles determines the critical mixing time gas–particle partitioning volatile compounds in atmosphere. semi-volatile ammonium nitrate (NH4NO3) might alter highly viscous secondary organic during their lifetimes. In contrast to particles, data on internally mixed inorganic–organic are scarce. We determined an aqueous ternary system consisting NH4NO3 and a proxy compound for organic, sucrose. Three techniques were applied cover atmospherically relevant humidity range: viscometry, fluorescence recovery after photobleaching, poke-flow technique. show that NH4NO3–sucrose–H2O with inorganic dry mass ratio 4:1 is 4 orders magnitude lower than sucrose under low-humidity conditions (30 % relative (RH), 293 K). By comparing predictions rules those Aerosol Inorganic–Organic Mixtures Functional groups Activity Coefficients Viscosity (AIOMFAC-VISC) model, we found rule based mole fractions performs similarly when from corresponding binary subsystems available. Applying this rule, estimated characteristic internal indicating significantly faster mixtures compared electrolyte-free especially at RH. Hence, assumption global atmospheric chemistry models quasi-instantaneous equilibrium reasonable single-phase containing dissolved electrolytes (but not necessarily phase-separated particles), most planetary boundary layer. Further needed see whether holds entire troposphere midlatitudes RH > 35 %.

Language: Английский

Viscosity of aqueous ammonium nitrate–organic particles: equilibrium partitioning may be a reasonable assumption for most tropospheric conditions DOI Creative Commons
Liviana K. Klein, Allan K. Bertram, Andreas Zuend

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(23), P. 13341 - 13359

Published: Dec. 3, 2024

Abstract. The viscosity of aerosol particles determines the critical mixing time gas–particle partitioning volatile compounds in atmosphere. semi-volatile ammonium nitrate (NH4NO3) might alter highly viscous secondary organic during their lifetimes. In contrast to particles, data on internally mixed inorganic–organic are scarce. We determined an aqueous ternary system consisting NH4NO3 and a proxy compound for organic, sucrose. Three techniques were applied cover atmospherically relevant humidity range: viscometry, fluorescence recovery after photobleaching, poke-flow technique. show that NH4NO3–sucrose–H2O with inorganic dry mass ratio 4:1 is 4 orders magnitude lower than sucrose under low-humidity conditions (30 % relative (RH), 293 K). By comparing predictions rules those Aerosol Inorganic–Organic Mixtures Functional groups Activity Coefficients Viscosity (AIOMFAC-VISC) model, we found rule based mole fractions performs similarly when from corresponding binary subsystems available. Applying this rule, estimated characteristic internal indicating significantly faster mixtures compared electrolyte-free especially at RH. Hence, assumption global atmospheric chemistry models quasi-instantaneous equilibrium reasonable single-phase containing dissolved electrolytes (but not necessarily phase-separated particles), most planetary boundary layer. Further needed see whether holds entire troposphere midlatitudes RH > 35 %.

Language: Английский

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