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Updated: May 28, 2026

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
Published on: September 4, 2015
Solid/Liquid phase diagram of the ammonium sulfate/maleic acid/water system
Keith D Beyer1, Jason R Schroeder, Christian S Pearson
1Department of Chemistry, University of Wisconsin-La Crosse, La Crosse, Wisconsin 54601, USA. Beyer.Keit@uwlax.edu
Abstract:
We have studied the low temperature phase diagram and water activities of the ammonium sulfate/maleic acid/water system using differential scanning calorimetry and infrared spectroscopy of thin films. Using the results from our experiments, we have mapped the solid/liquid ternary phase diagram, determined the water activities based on the freezing point depression, and determined the ice/maleic acid phase boundary as well as the ternary eutectic composition and temperature. We also compare our results to the predictions of the extended AIM aerosol thermodynamics model and find good agreement for the ice melting points in the ice primary phase field of this system; however significant differences were found with respect to phase boundaries, maleic acid dissolution, and ammonium sulfate dissolution.
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