离子对液态水缔合构造影响的能量表征

引用本文: 和劲松, 杨宏伟, 甘晓玲, 蔡然, 朱松明, 于勇, 李建平, 木泰华, 祝万鹏. 离子对液态水缔合构造影响的能量表征[J]. 物理化学学报, 2011, 27(11): 2499-2504. doi: 10.3866/PKU.WHXB20111102 shu

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

离子对液态水缔合构造影响的能量表征

和劲松 ^1,2, ,
杨宏伟 ^2, ,
甘晓玲 ^1, ,
蔡然 ^2, ,
朱松明 ^1, ,
于勇 ^1, ,
李建平 ^1, ,
木泰华 ^3, ,
祝万鹏 ^2,

基金项目:
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)

摘要: 利用差示扫描量热法(DSC), 从能量变化的角度研究了在0-1.0 mol·L^-1浓度范围内, KCl、MgCl₂与CaCl₂对液态水缔合构造的影响, 并与¹⁷O-NMR化学位移δ(¹⁷OH₂)的分析结果进行比较. 随KCl、MgCl₂与CaCl₂浓度的升高, 液态水的δ(¹⁷OH₂)呈线性增加, 而表观活化能(-E'/R)呈线性减小. 并且δ(¹⁷OH₂)与-E'/R对盐类浓度的变化率的大小满足如下顺序: KCl < MgCl₂ < CaCl₂. 基于二态模型, 可以证明伴随盐类浓度的改变, 液态水化学位移的变化量Δδ与其摩尔内能的变化量ΔE满足线性关系. 以上结果表明, KCl、MgCl₂与CaCl₂对水分子的构造化具有促进作用, 在对水分子缔合构造的表征上, 液态水的内能变化与¹⁷O-NMR化学位移具有等效性.

关键词:

盐类
/ 水
/ 缔合构造
/ 氢键
/ 能量表征

English

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: 01 June 2011
Available Online: 27 October 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

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:

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沈阳化工大学材料科学与工程学院沈阳 110142

离子对液态水缔合构造影响的能量表征

English

Energy Characterization of Effect for Ions on the Structure of Water

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

离子对液态水缔合构造影响的能量表征

English

Energy Characterization of Effect for Ions on the Structure of Water

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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