物理化学学报 >> 2006, Vol. 22 >> Issue (07): 888-890.doi: 10.3866/PKU.WHXB20060724

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水+3-甲基吡啶+溴化钠三元溶液临界跨接现象

高学艺;安学勤;王农;马兴科;沈伟国   

  1. 兰州大学化学化工学院, 兰州 730000; 南京师范大学化学与环境科学学院, 南京 210097; 华东理工大学化学系, 上海 200237
  • 收稿日期:2005-12-19 修回日期:2006-03-14 发布日期:2006-06-27
  • 通讯作者: 沈伟国 E-mail:shenwg@lzu.edu.cn

Critical Crossover Phenomena in Ternary Solutions of Water+3-methylpyridine+Sodium Bromide

GAO Xue-Yi;AN Xue-Qin;WANG Nong;MA Xing-Ke;SHEN Wei-Guo   

  1. College of Chemistry & Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China; College of Chemistry and Environment Science, Nanjing Normal University, Nanjing 210097, P. R. China; Department of Chemistry, East China University of Science and Technology, Shanghai 200237, P. R. China
  • Received:2005-12-19 Revised:2006-03-14 Published:2006-06-27
  • Contact: SHEN Wei-Guo E-mail:shenwg@lzu.edu.cn

摘要: 采用折射率法在较宽温度范围内研究了溴化钠、3-甲基吡啶和水的临界质量分数分别为0.240、0.192和0.568体系的临界性质, 发现在近临界点临界指数为0.365, 与Fishe重整化值一致. 有效临界指数随着温度逐渐远离临界点, 从0.365下降到0.20左右, 但当排除了“正规项”的影响后, 展现出向平均场理论值0.5单调跨接的行为.

关键词: 电解质溶液, 临界现象, 临界跨接, 共存曲线, 折射率

Abstract: The critical phenomena of water + 3-methylpyridine + sodium bromide system, with the mass fractions of sodium bromide, 3-methylpyridine, and water being 0.240, 0.192, and 0.568, respectively, have been studied by measuring refractive indexes in two coexisting phases. It was found that the effective critical exponent was 0.365 near the critical point, which is in well agreement with the Fisher renormalization value. As the distance from the critical point increased, the effective critical exponent decreased from 0.365 to 0.20, but it exhibited crossover from Ising to mean-field critical behavior after the regular term was subtracted.

Key words: Electrolyte solution, Critical phenomena, Critical crossover, Coexistence curve, Refractive index