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化学学报
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化学学报 ›› 2009, Vol. 67 ›› Issue (3): 191-196. 上一篇    下一篇

研究论文

水＋3-甲基吡啶＋溴化钠三元溶液动-静态光散射临界行为研究

王金收a 安学勤a,c 王 农b 彭旭红a
吕和坤a 柴守宁a 沈伟国*,a,b

  

  1. (a兰州大学化学化工学院 兰州 730000)
    (b华东理工大学化学系 上海 200237)
    (c南京师范大学化学与环境科学学院 南京 210097)

  • 投稿日期:2008-06-23 修回日期:2008-08-22 发布日期:2009-02-14
  • 通讯作者: 沈伟国

Investigation of the Critical Phenomena in Ternary Solutions of Water＋3-Methylpyridine＋Sodium Bromide by the Dynamic and Static Light Scattering

Wang, Jinshou a An, Xueqin a,c Wang, Nong b Peng, Xuhong a
Lü, Hekun a Chai, Shouning a Shen, Weiguo *,a,b
  

  1. (a Department of Chemistry, Lanzhou University, Lanzhou 730000)
    (b Department of Chemistry, East China University of Science and Technology, Shanghai 200237)
    (c College of Chemistry and Environment Science, Nanjing Normal University, Nanjing 210097)
  • Received:2008-06-23 Revised:2008-08-22 Published:2009-02-14
  • Contact: Shen, Weiguo

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被引次数

1

对水＋3-甲基吡啶＋溴化钠三元电解质溶液的临界跨接行为的认识存在着争议. 部分研究认为由于三甲基吡啶的聚集, 体系存在从非经典的3D-Ising(三维伊辛)行为向经典的平均场行为的非单调跨接; 另一部分研究发现该体系符合3D-Ising临界行为, 并不存在跨接. 采用动-静态光散射研究了溴化钠, 3-甲基吡啶和水三元溶液的临界性质, 得到动态关联长度和静态关联长度, 发现动态关联长度和静态关联长度一致, 且在实验温度范围内(离临界温度0.01～25 K), 体系不违背3D-Ising行为, 也观测不到显著的临界跨接现象.

关键词: 电解质溶液, 临界现象, 临界跨接, 动态光散射, 静态光散射

The critical crossover behavior in the ternary electrolyte solutions of water＋3-methylpyridine＋sodium bromide is a matter of debate. Some studies exhibited a crossover from asymptotic Ising behavior to mean-field critical behavior in this system, while the others showed universal Ising-like critical behavior without the evidence of the critical crossover. In this paper, the critical phenomena of those ternary mixtures with the critical composition have been studied by the dynamic and static light scattering. The dynamic and the static correlation lengths were measured and found to be consistent with each other. Moreover, the dynamic and static effective critical exponents exhibited the 3D-Ising value and the crossover was not observed in the temperature range we studied.

Key words: electrolyte solution, critical phenomenon, critical crossover, dynamic light scattering, static light scattering