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  

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

作　　者：王金收[1] 安学勤[1,2] 王农[3] 彭旭红[1] 吕和坤[1] 柴守宁[1] 沈伟国[1,3] 

机构地区：[1]兰州大学化学化工学院,兰州730000 [2]南京师范大学化学与环境科学学院,南京210097 [3]华东理工大学化学系,上海200237

出　　处：《化学学报》2009年第3期191-196,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.20173024,20603014,20673059);国家教育部基金(No.105074);上海科学技术委员会(Nos.0652nm010,08jc1408100)资助项目

摘　　要：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0.01～25K),体系不违背3D-Ising行为,也观测不到显著的临界跨接现象。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.

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 

分 类 号：O626.32[理学—有机化学]