Structural study of low concentration LiCl aqueous solutions in the liquid, supercooled, and hyperquenched glassy states.
Structural study of low concentration LiCl aqueous solutions in the liquid, supercooled, and hyperquenched glassy states.
复制标题
液态、过冷和超淬火玻璃态低浓度 LiCl 水溶液的结构研究。
作者：
K. Winkel;M. Seidl;T. Loerting;L. Bove;S. Imberti;V. Molinero;F. Bruni;R. Mancinelli;M. Ricci
报道了在经验势能结构修正框架下，在常温、过冷和过淬态条件下对LiCl水溶液(R=40)进行的中子衍射实验。在所研究的所有热力学状态下，都能找到在如此少量的盐存在下改变溶剂微观结构的证据。另一方面，尽管径向分布函数的所有峰在本情况下都更宽，但很明显，超淬火的盐样的结构类似于纯低密度无定形水的结构。离子水化壳层和接触过冷或过淬灭时的变化是有限的，这些状态下分离现象的证据并不清楚，尽管具有相同符号的离子之间存在水分离接触是有趣的。
Neutron diffraction experiments on a solution of LiCl in water (R = 40) at ambient conditions and in the supercooled and hyperquenched states are reported and analyzed within the empirical potential structure refinement framework. Evidence for the modifications of the microscopic structure of the solvent in the presence of such a small amount of salt is found at all investigated thermodynamic states. On the other hand, it is evident that the structure of the hyperquenched salty sample is similar to that of pure low density amorphous water, although all the peaks of the radial distribution functions are broader in the present case. Changes upon supercooling or hyperquenching of the ion's hydration shells and contacts are of limited size and evidence for segregation phenomena at these states does not clearly show up, although the presence of water separated contacts between ion of the same sign is intriguing.