The universal characteristic water content of aqueous solutions

doi:10.1088/1674-1056/28/6/065101

中国物理B ›› 2019, Vol. 28 ›› Issue (6): 65101-065101.doi: 10.1088/1674-1056/28/6/065101

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇下一篇

The universal characteristic water content of aqueous solutions

Xiao Huang(黄晓), Ze-Xian Cao(曹则贤), Qiang Wang(王强)

1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100190, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

收稿日期:2019-03-07 修回日期:2019-03-22 出版日期:2019-06-05 发布日期:2019-06-05
通讯作者: Qiang Wang E-mail:qwang@iphy.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11474325, 11474335, and 51172272), the Fund from the Chinese Academy of Sciences (Grant No. 1731300500030), and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB07030100).

The universal characteristic water content of aqueous solutions

Xiao Huang(黄晓)^1,2, Ze-Xian Cao(曹则贤)^1,2,3, Qiang Wang(王强)¹

1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100190, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

Received:2019-03-07 Revised:2019-03-22 Online:2019-06-05 Published:2019-06-05
Contact: Qiang Wang E-mail:qwang@iphy.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11474325, 11474335, and 51172272), the Fund from the Chinese Academy of Sciences (Grant No. 1731300500030), and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB07030100).

摘要/Abstract

摘要：

Raman measurements at room temperature reveal a characteristic concentration for a series of aqueous solutions of electrolytes, through which O-H stretching vibration of H₂O or dilute HDO obviously changes their concentration dependence. This characteristic concentration is very consistent with another, through which the solutions undergo an abrupt change in their glass-forming ability. Interestingly, the molar ratio of water to solute at these two consistent concentration points is almost solute-type independent and about twice the hydration number of solutes. We suggest that just when the concentration increases above this characteristic concentration, bulk-like free water disappears in aqueous solutions and all water molecules among closely-packed hydrated solutes exhibit the characteristics of confined water.

关键词: aqueous solutions, stretching vibration of water, concentration dependence, hydration number

Abstract:

Key words: aqueous solutions, stretching vibration of water, concentration dependence, hydration number

中图分类号: (Thermodynamic properties, equations of state)

51.30.+i

64.70.D- (Solid-liquid transitions) 65.20.-w (Thermal properties of liquids)

黄晓, 曹则贤, 王强. The universal characteristic water content of aqueous solutions[J]. 中国物理B, 2019, 28(6): 65101-065101.

Xiao Huang(黄晓), Ze-Xian Cao(曹则贤), Qiang Wang(王强). The universal characteristic water content of aqueous solutions[J]. Chin. Phys. B, 2019, 28(6): 65101-065101.

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