ABSTRACT

The solubility of NaCl in water is one of the most important thermo-physical properties. However, the solubility behavior of NaCl in water is poorly understood at high pressure and low temperature. Herein, we performed high pressure neutron diffraction and Raman scattering to investigate the solubility of NaCl in water and the corresponding structural change, respectively. With the pressure increasing, the solubility almost increases linearly below 0.2 GPa, beyond which it starts to level off and reaches its maximum at about 0.61 GPa. The Raman spectra suggested that the deformation of the hydrogen-bonded network in the NaCl aqueous solution promotes the formation of ions pairing and is responsible for the solubility increase of NaCl in water. Finally, we used a two-dimensional Mercedes-Benz model to descript the picture of solubility behavior of NaCl in water at high pressure.

抽象的

NaCl在水中的溶解度是最重要的热物理性质之一。然而，在高压和低温下对NaCl在水中的溶解行为了解得很少。本文中，我们进行了高压中子衍射和拉曼散射研究，分别研究了氯化钠在水中的溶解度和相应的结构变化。随着压力的增加，低于0.2 GPa时溶解度几乎呈线性增加，超过此水平它开始趋于平稳并在约0.61 GPa达到最大值。拉曼光谱表明，NaCl水溶液中氢键网络的形变促进了离子配对的形成，并导致NaCl在水中的溶解度增加。最后，