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Chin. Phys. B, 2019, Vol. 28(6): 065101    DOI: 10.1088/1674-1056/28/6/065101

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

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.

Keywords:  aqueous solutions      stretching vibration of water      concentration dependence      hydration number  
Received:  07 March 2019      Revised:  22 March 2019      Accepted manuscript online: 
PACS:  51.30.+i (Thermodynamic properties, equations of state)  
  64.70.D- (Solid-liquid transitions)  
  65.20.-w (Thermal properties of liquids)  

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).

Corresponding Authors:  Qiang Wang     E-mail:

Cite this article: 

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

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