离子对液态水缔合构造影响的能量表征

doi:10.3866/PKU.WHXB20111102

Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (11): 2499-2504.doi: 10.3866/PKU.WHXB20111102

• THERMODYNAMICS, KINETICS, AND STRUCTURAL CHEMISTRY • Previous Articles Next Articles

Energy Characterization of Effect for Ions on the Structure of Water

HE Jin-Song^1,2, YANG Hong-Wei², GAN Xiao-Ling¹, CAI Ran², ZHU Song-Ming¹, YU Yong¹, LI Jian-Ping¹, MU Tai-Hua³, ZHU Wan-Peng²

1. College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, P. R. China;
2. Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, P. R. China;
3. Institute of Agro-Food Science & Technology, Chinese Academy of Agricultural Sciences, Beijing 100094, P. R. China

Received:2011-06-01 Revised:2011-07-15 Published:2011-10-27
Contact: ZHU Song-Ming, MU Tai-Hua E-mail:zhusm@zju.edu.cn; mutaihua@126.com
Supported by:
The project was supported by the Key Scientific and Technological Innovation Team Project of Zhejiang Province, China (2009R50001) and Department of Education of Zhejiang Province, China (Y201018520).

Abstract

Abstract: At a concentration of 0-1.0 mol·L^-1 the effect of salts (KCl, MgCl₂, and CaCl₂) on the structure of water was studied from the viewpoint of energy change using differential scanning calorimetry (DSC) and the results were compared with that obtained by the analysis of the chemical shift obtained by ¹⁷O-NMR (δ(¹⁷OH₂)). A linear increase in the δ(¹⁷OH₂) of water and a linear decrease in the apparent activation energy (-E'/R) of water with an increase in the concentration of salt was obtained. In addition, the rate of change of δ(¹⁷OH₂) and -E'/R increased as follows: KCl22. Based on a two-state model, we demonstrate that the change in δ(¹⁷OH₂) of water (Δδ) is proportional to the change in molar energy of water (ΔE). These results indicate that KCl, MgCl₂, and CaCl₂ promote the formation of the water cluster structure and the energy change of water is equivalent to the chemical shift obtained by ¹⁷ONMR for the characterization of the water cluster structure.

Key words: Salt, Water, Cluster structure, Hydrogen bond, Energy characterization

MSC2000:

O645

HE Jin-Song, YANG Hong-Wei, GAN Xiao-Ling, CAI Ran, ZHU Song-Ming, YU Yong, LI Jian-Ping, MU Tai-Hua, ZHU Wan-Peng. Energy Characterization of Effect for Ions on the Structure of Water[J].Acta Phys. -Chim. Sin., 2011, 27(11): 2499-2504.

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Energy Characterization of Effect for Ions on the Structure of Water

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