Effect of dissolved salt on the anomalies of water at negative pressure

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Amer Inst Physics
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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.
We thank Mikhail A. Anisimov for helpful discussions on critical phenomena in solutions and Christoph Dellago and Andreas Singraber for providing the data used to plot Fig. 12. C.S.P.T. and F.C. acknowledge funding by the European Research Council under the European Community's FP7 Grant Agreement No. 240113. C.V. acknowledges funding from the Spanish Ministry of Education (Grant No. FIS2016-78847). A.Z. was funded by CONACYT (Ph.D. fellowship) and M.A.G. by the Spanish Ministry of Education (Juan de la Cierva fellowship).
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