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Effects of sulfuric acid and ammonium …

Allan K. Bertram [email protected] Department of Chemistry, University of British Columbia, British Columbia, Canada. Search for more papers by this author. ... Martin et …

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Predicting the relative humidities of liquid-liquid phase …

Increasing RH -ammonium sulfate particles. These transitions can occur as atmo-spheric relative humidity fluctuates between high and low values. Aqua, green, and red respectively represent …

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Secondary Organic Material Produced by the Dark

Bertram et al. (2011) suggested that the Gibbs–Duhem relation, which implies that an increase of organic to sulfate ratio increases the chemical potential of organics but decreases the chemical ...

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Partial crystallization and deliquescence of particles …

[1] The partial crystallization and deliquescence of ammonium sulfate (AS) particles internally mixed with malonic acid (MA), glutaric acid (GA), and succinic acid (SA) were …

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[PDF] Predicting the relative humidities …

This study investigates organic/electrolyte interactions of ammonium sulfate, nitrate and sodium chloride with substances containing carboxylic acids (COOH) and hydroxyl (OH) …

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Strong dependence of cubic ice formation on droplet ammonium to sulfate

[1] We show that the phase of ice that crystallizes in solution droplets, under conditions relevant for the upper troposphere (UT) and tropopause region (typically >188 K), is …

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Hygroscopic and phase separation properties of …

ammonium sulfate has been shown to be a poor nucleus for ... monium sulfate (Bertram et al., 2011; Buajarern et al., 2007). For systems in which phase separation does not occur, or-

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[PDF] Predicting the relative humidities …

Abstract. Individual particles that on a mass basis consist dominantly of the components ammonium sulfate, oxygenated organic material, and water are a common class of submicron …

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Images reveal that atmospheric particles can …

In a first set of measurements focused on the laboratory samples, we investigated the phase behavior of particles consisting of ammonium sulfate mixed with SOM that had been produced for conditions designed to simulate …

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Viscosity and physical state of sucrose mixed with ammonium sulfate …

Abstract. Although knowledge of the physical state of aerosol particles is essential to understand atmospheric chemistry model and measurements, information on the viscosity …

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Effects of sulfuric acid and ammonium sulfate coatings on …

[1] The onset conditions for ice nucleation on H 2 SO 4 coated, (NH 4) 2 SO 4 coated, and uncoated kaolinite particles at temperatures ranging from 233 to 246 K were …

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Ice nucleation in sulfuric acid and ammonium sulfate …

effective for measuring ice nucleation in sulfate aerosol [Bertram et al., 1996; Cziczo and Abbatt, 1999]. We deviate from earlier FTIR studies, however, in our method of ... ammonium sulfate …

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Liquid–liquid phase separation in particles containing …

mixed with ammonium sulfate, ammonium bisulfate, ammonium nitrate or sodium chloride Y. You, L. Renbaum-Wolff, and A. K. Bertram ... Bertram et al., 2011; Reid et al., 2011; Song et al., …

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Liquid–liquid phase separation in particles containing …

You, Y, Renbaum-Wolff, L, Bertram, AK: Journal: Atmospheric Chemistry and Physics: Volume: 13: Pagination: ... ammonium sulfate, ammonium bisulfate, ammonium nitrate and sodium …

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ACP

Liquid–liquid phase separation in particles containing organics mixed with ammonium sulfate, ammonium bisulfate, ammonium nitrate or sodium chloride ... Robert Wagner, Luisa Ickes, …

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Effects of Different Types of Sulphates and …

C. Sodium Sulphate (Na 2SO 4): The anhydrous form of sodium sulphate was used in the experiment, with a molar mass of 142.04g/mol and a percentage purity of 99%. Sodium …

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17 Advantages and Disadvantages of Ammonium …

Ammonium sulfate fertilizer is affordable for the average grower. The price of ammonium sulfate fertilizer is one of the primary reasons why some growers prefer to use this chemical product. Synthetic items are typically …

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Hygroscopic and phase separation properties of …

Ammonium sulfate aerosol mixed with organic polyols with different O : C ratios, including 1,4-butanediol, glycerol, 1,2,6-hexanel, 1,2-hexanediol, and 1,5-pentanediol have been investigated.

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ACP

Specifically these variables were used to predict the critical relative humidity of liquid-liquid phase separation (SRH), efflorescence (ERH), and deliquescence (DRH). Experiments were …

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Granulation by spray coating aqueous solution of ammonium sulfate …

Spherical 2–4 mm granules of ammonium sulfate (NH 4) 2 SO 4 are promising fertilizer for practical use, though only much smaller grains are being produced in industry. …

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Publications | Bertram Research Group

A.K. Bertram, and S.T. Martin, Deliquescence, efflorescence, and phase miscibility of mixed particles of ammonium sulfate and isoprene-derived secondary organic material.

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Hygroscopic and phase separation properties of …

Organics whose O V C ratio is bigger than 0.7, such as glycerol, were found by Bertram et al. (2011), in a study using optical microscopy, to lower the ERH and DRH of ammonium sulfate …

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Raman spectra of (a) a pure ammonium sulfate …

The Cryo- TEM results indicate that ammonium sulfate particles (or particles at least dominated by ammonium sulfate) are mixed with a secondary compound that separated during freezing in the TEM ...

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Deliquescence and Crystallization of Ammonium Sulfate Particles

The deliquescence and crystallization of ammonium sulfate particles internally mixed with water-soluble organic material have been studied, restricted to an organic mass …

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phase-separated organic-sulfate particles: effect of …

of ammonium sulfate (Bertram et al., 2011; Smith et al., 2011). Past work has shown that phase-separated particles containing two liquids can as- sume a number of partially engulfed …

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Viscosity and physical state of sucrose …

Abstract. Although knowledge of the physical state of aerosol particles is essential to understand atmospheric chemistry model and measurements, information on the …

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Deliquescence, efflorescence, and supercooling of ammonium sulfate

Ammonium sulfate aerosols exhibited significantly less than 39 deg of supercooling when referenced to the equilibrium freezing line. These results indicate that ammonium sulfate …

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(PDF) Predicting the relative humidities of liquid …

Here we use (1) the organic-to-sulfate (org:sulf) mass ratio of the overall particle and (2) the oxygen-to-carbon (O:C) elemental ratio of the organic component as input variables in...

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Hygroscopic and phase separation properties of …

Crystalline ammonium sulfate has been shown to be a poor nucleus for 15 subsequent heterogeneous nucleation of organics, which may serve to explain why certain 16 organics …

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Effects of molecular weight and temperature on …

at 273K and 290K for particles containing ammonium sul-fate and 1,2,6-hexanel (Bertram et al., 2011). Schill and Tolbert, 2013 reported that SRH results were similar for tem-peratures …