Composition and temperature dependence of the deliquescence properties of hygroscopic aerosols

Tang, I.N.; Munkelwitz, H.R.

doi:10.1016/0960-1686(93)90204-c

Cited by 467 publications

(436 citation statements)

References 20 publications

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“…NaCl crystals deliquesce 68,69 at RH between 72 and 81% and crystallization/effluorescence 68,70 occurs at 42% RH. Experiments in the presence of water vapor were therefore carried out at RH r25% in order to maintain the integrity of the solid required for DRIFTS.…”

Section: O 3 Reaction In the Presence Of Added Water Vapormentioning

confidence: 99%

A new mechanism for ozonolysis of unsaturated organics on solids: phosphocholines on NaCl as a model for sea salt particles

Karagulian

Lea

Dilbeck

et al. 2008

Phys. Chem. Chem. Phys.

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PERSPECTIVEThe ozonolysis of an approximately one monolayer film of 1-oleoyl-2-palmitoyl-sn-glycero-3-phosphocholine (OPPC) on NaCl was followed in real time using diffuse reflection infrared Fourier transform spectrometry (DRIFTS) at 23 1C. Matrix-assisted laser desorption/ionization (MALDI) mass spectrometry and Auger electron spectroscopy were used to confirm the identification of the products. Ozone concentrations ranged from 1.7 Â 10 12 to 7.0 Â 10 13 molecules cm À3 (70 ppb to 2.8 ppm). Upon exposure to O 3 , there was a loss of CQC accompanied by the formation of a strong band at B1110 cm À1 due to the formation of a stable secondary ozonide (1,2,4-trioxolane, SOZ). The yield of the SOZ was smaller when the reaction was carried out in the presence of water vapor at concentrations corresponding to relative humidities between 2 and 25%.

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Section: O 3 Reaction In the Presence Of Added Water Vapormentioning

confidence: 99%

A new mechanism for ozonolysis of unsaturated organics on solids: phosphocholines on NaCl as a model for sea salt particles

Karagulian

Lea

Dilbeck

et al. 2008

Phys. Chem. Chem. Phys.

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“…There are diverse methods to measure aerosol water content, e.g., gravimetric analysis to determine the amount of water associated with the mass of aerosol on a filter (McInnes et al, 1996;Lee and Hsu, 2000;Spindler et al, 2012), optical methods using Nephelometers or extinction cells (Carrico et al, 2000;Nessler et al, 2005;Kim et al, 2006), microscopy such as scanning electron microscope (SEM) and environmental transmission electron microscope (ETEM) (Ohta et al, 1998;Ebert et al, 2002;Wise et al, 2005), electrodynamic balance to study properties of single droplets of multicomponent systems (Tang and Munkelwitz, 1993;Tong et al, 2011;Davies et al, 2013;Zuend et al, 2013). Among all, the most frequently used is the hygroscopic tandem differential mobility analyzer (H-TDMA) (Liu et al, 1978;Rader and McMurry, 1986), which measures hygroscopic growth by size-selecting individual particles with a Differential Mobility Analyzer (DMA), exposing them to elevated or reduced RH and then measuring aerosol diameter change using a second DMA (Swietlicki et al, 2008;Kitamori et al, 2009;Ye et al, 2011;Wang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Continuous Measurement of Ambient Aerosol Liquid Water Content in Beijing

Fajardo

Jiang

Hao

2016

Aerosol Air Qual. Res.

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The amount of liquid water present on ambient aerosol particles influences its radiative properties, the partitioning of gas-phase organic and inorganic compounds to the condensed phase, and the assessment of particle health effects upon inhalation. An improved home-made Dry-Ambient Aerosol Size Spectrometer (DAASS) was implemented and deployed at a sampling site in Beijing to measure water content and volumetric growth factor of fine ambient aerosol during clean and polluted days. Aerosol chemical composition was characterized by an aerosol chemical speciation monitor (ACSM). Meteorological conditions were also assessed to trace origin of the air masses arriving at the site. A thermodynamic model, ISORROPIA II, was used to predict aerosol water content based on inorganic compositions measured by ACSM. It was then compared with the aerosol water content measured by DAASS. During the two-week sampling period, an aerosol efflorescence behavior was observed around 50% relative humidity (RH). Aerosol at the sample location was predominantly alkaline, with an average acidity ratio of 1.3 during the polluted days but very variable during the clean days. This fact coupled with generally low ambient RH resulted in low amounts of liquid water detected during the campaign. When RH reached its maximum of 87% and aerosol appeared to be more acidic, the maximum amount of aerosol water content measured was 1.3 µg m -3 (44.9% wt of DAASS measured ambient aerosol). Measured aerosol water content and model predictions seem to show a better agreement during the more polluted days, but during the clean days aerosol organic fraction appears to have an important contribution in the water content. We argue that the organicassociated water is comparable with that associated with inorganic compositions during the clean periods at low ambient RH conditions.

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“…When the continental air enters marine environment of the Gulf of Maine the temperature lowers significantly and the relative humidity (RH) reaches quickly the deliquescence relative humidity (DRH) and a fog is formed. The temperature dependence of DRH has been derived by Tang and Munkelwitz (1993) of the sample calculations are presented on Figs. (1-4) in a form of 3-D plots of the enhancement of the rate of Brownian capture of primary soot particles by condensing marine droplets at vapor pressures exceeding the deliquescence point for NaCl.…”

Section: Enhancement Of Capture Of Primary Soot Particles By Condensimentioning

confidence: 99%

Brownian Coagulation of Knudsen Particles on Evaporating/Condensing Aerosol Droplet; Modeling of Capture of Soot Particles by Marine Fog

Sitarski

2012

Aerosol Air Qual. Res.

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The theoretical model presented in this work allows quantitative prediction of the rate of Brownian coagulation of pollutant particles on a condensing aerosol droplet. The coupling of the processes of condensation and Brownian coagulation is established through the hydrodynamic-diffusiophoretic force acting upon the Brownian particles in the vicinity of the droplet. The new analytical approach is based on the Grad's moment method of solution to the Fokker Planck equation. The aerosol system is assumed to be isothermal and close to the thermodynamic equilibrium (i.e., the condensation and coagulation fluxes are small). The numerical predictions of the diffusiophoretic enhancement of Brownian coagulation rates are provided for NaCl-water droplets capturing small (primary) soot particles. The results of calculations show substantial enhancement (10 to 200 times) of the capture of soot particles by the condensing marine droplets for typical conditions that occur on the north-eastern coast of the U.S.A.

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Composition and temperature dependence of the deliquescence properties of hygroscopic aerosols

Cited by 467 publications

References 20 publications

A new mechanism for ozonolysis of unsaturated organics on solids: phosphocholines on NaCl as a model for sea salt particles

A new mechanism for ozonolysis of unsaturated organics on solids: phosphocholines on NaCl as a model for sea salt particles

Continuous Measurement of Ambient Aerosol Liquid Water Content in Beijing

Brownian Coagulation of Knudsen Particles on Evaporating/Condensing Aerosol Droplet; Modeling of Capture of Soot Particles by Marine Fog

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