Citation: 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 Physico-Chimica Sinica, ;2011, 27(11): 2499-2504. doi: 10.3866/PKU.WHXB20111102 shu

Energy Characterization of Effect for Ions on the Structure of Water

1.
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 Date: 1 June 2011
Available Online: 26 August 2011
Fund Project: 浙江省重点科技创新团队(2009R50001)与浙江省教育厅(Y201018520)资助项目 (2009R50001)与浙江省教育厅(Y201018520)

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.
- Salt,
- Water,
- Cluster structure,
- Hydrogen bond,
- Energy characterization
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