Deliquescence of ammonium sulfate particles at sub-eutectic temperatures

Deliquescence Behavior of Organic/Ammonium Sulfate Aerosol

Infrared spectroscopic study of the low-temperature phase behavior of ammonium sulfate

[1] The low-temperature phase behavior of ammonium sulfate ((NH4)2SO4) films has been studied using Fourier transform infrared (FTIR) spectroscopy. While the deliquescence of ammonium sulfate aerosols is well characterized at temperatures above the eutectic of ice and anhydrous ammonium sulfate at 254 K, much less is known about the phase properties at lower temperatures. In the present study, ...

Deliquescence and efflorescence of small particles.

We examine size-dependent deliquescence/efflorescence phase transformation for particles down to several nanometers in size. Thermodynamic properties of inorganic salt particles, coated with aqueous solution layers of varying thickness and surrounded by vapor, are analyzed. A thin layer criterion (TLC) is introduced to define a limiting deliquescence relative humidity (RH(D)) for small particle...

Antihydrogen at sub-Kelvin temperatures

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Behavior of Calcium Sulfate at High Temperatures

Differential heating curves were used to study the behavior of calcium sulfate at high temperatures. After cooling, the material was examined by means of the petrographic microscope and by study of its X-ray pattern. It was found that the beta-to-alpha transition of calcium sulfate occurs at approximately 1,214° C, and the conclusion of i ts discoverer that the high temperature form is unstable...