中国物理B ›› 2018, Vol. 27 ›› Issue (5): 55101-055101.doi: 10.1088/1674-1056/27/5/055101

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Accurate quantification of hydration number for polyethylene glycol molecules

Wei Guo(郭伟), Lishan Zhao(赵立山), Xin Gao(高欣), Zexian Cao(曹则贤), Qiang Wang(王强)   

  1. 1 Department of Physics, University of Guizhou, Guiyang 550025, China;
    2 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2018-01-19 修回日期:2018-02-08 出版日期:2018-05-05 发布日期:2018-05-05
  • 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 and 11290161) and the Knowledge Innovation Project of Chinese Academy of Sciences on Water Science Research (Grant No.KJZD-EW-M03).

Accurate quantification of hydration number for polyethylene glycol molecules

Wei Guo(郭伟)1,2, Lishan Zhao(赵立山)2, Xin Gao(高欣)1, Zexian Cao(曹则贤)2, Qiang Wang(王强)2   

  1. 1 Department of Physics, University of Guizhou, Guiyang 550025, China;
    2 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2018-01-19 Revised:2018-02-08 Online:2018-05-05 Published:2018-05-05
  • Contact: Qiang Wang E-mail:qwang@iphy.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos.11474325 and 11290161) and the Knowledge Innovation Project of Chinese Academy of Sciences on Water Science Research (Grant No.KJZD-EW-M03).

摘要:

Hydration water can even decide the physicochemical properties of hydrated organic molecules. However, by far the most important hydration number for organic molecules, in particular polyethylene glycol which we are concerned with here, usually suffers from a large discrepancy. Here, we provide a scheme for accurate and unambiguous quantification of the hydration number based on the universal water-content dependence of glass transition temperature for aqueous solutions, testified by experimental results for polyethylene glycol molecules of a molar weight ranging from 200 to 20000. Moreover, we also clarify the fundamental misunderstanding lying in the definition and quantification of hydration water for PEG molecules in the literature, therein the hydration number for PEG in water-rich solutions has been determined at a critical concentration, across which the properties of the solution display obviously distinct water-content dependence.

关键词: hydration number, aqueous solution, polyethylene glycol, vitrification and crystallization

Abstract:

Hydration water can even decide the physicochemical properties of hydrated organic molecules. However, by far the most important hydration number for organic molecules, in particular polyethylene glycol which we are concerned with here, usually suffers from a large discrepancy. Here, we provide a scheme for accurate and unambiguous quantification of the hydration number based on the universal water-content dependence of glass transition temperature for aqueous solutions, testified by experimental results for polyethylene glycol molecules of a molar weight ranging from 200 to 20000. Moreover, we also clarify the fundamental misunderstanding lying in the definition and quantification of hydration water for PEG molecules in the literature, therein the hydration number for PEG in water-rich solutions has been determined at a critical concentration, across which the properties of the solution display obviously distinct water-content dependence.

Key words: hydration number, aqueous solution, polyethylene glycol, vitrification and crystallization

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)