2020/01/31 by Alberto Zaragoza, Chandra Shekhar Pati Tripathi, Miguel A. Gonzalez +3
Biochemistry, Genetics and Molecular Biology · Materials Science · Physics and Astronomy · #Anomaly (physics) #Aqueous solution #Chemical and Physical Studies #Material Dynamics and Properties #Molality #Salt (chemistry) #Salt water #Sodium #Spectroscopy and Quantum Chemical Studies #Speed of sound #cond-mat.soft #cond-mat.stat-mech #physics.chem-ph
paper · pdf · doi:10.1063/5.0002745
published as J. Chem. Phys. 152, 194501 (2020) · 10 pages, 13 figures, 1 appendix. Added minor simulation details
openalex created_date 2020/02/07 · arxiv created 2020/04/20 · openalex publication_date 2020/05/19 · arxiv updated 2020/07/20 · openalex updated_date 2026/08/05
Adding salt to water at ambient pressure affects its thermodynamic properties. At low salt concentration, anomalies such as the density maximum are shifted to lower temperature, while at large enough salt concentration, they cannot be observed any more. Here, we investigate the effect of salt on an anomaly recently observed in pure water at negative pressure: the existence of a sound velocity minimum along isochores. We compare experiments and simulations for an aqueous solution of sodium chloride with molality around 1.2 mol kg−1, reaching pressures beyond −100 MPa. We also discuss the origin of the minima in the sound velocity and emphasize the importance of the relative position of the temperatures of sound velocity and density anomalies.