物理化学学报 >> 2008, Vol. 24 >> Issue (01): 20-24.doi: 10.3866/PKU.WHXB20080104

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微波频率下氯化钠溶液电导率的非线性特性

黄卡玛; 贾国柱; 杨晓庆   

  1. 四川大学电子信息学院, 成都 610064
  • 收稿日期:2007-06-20 修回日期:2007-09-17 发布日期:2008-01-05
  • 通讯作者: 黄卡玛 E-mail:kmhuang@scu.edu.cn

Nonlinear Characteristics of Conductivity in Aqueous NaCl Solution at Microwave Frequency

HUANG Ka-Ma; JIA Guo-Zhu; YANG Xiao-Qing   

  1. College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, P. R. China
  • Received:2007-06-20 Revised:2007-09-17 Published:2008-01-05
  • Contact: HUANG Ka-Ma E-mail:kmhuang@scu.edu.cn

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摘要： 在微波频段研究了电磁场对氯化钠溶液电导率的影响. 运用不对称周期双阱势函数和Langvin方程描述了恒温条件下氯化钠溶液团簇结构中平均氢键的动力学行为, 由Bertolini公式建立团簇的平均氢键形成的概率变化与电导率变化的关系. 计算结果表明, 在恒温条件下, 当微波场的场强达到10 kV·m-1 时, 微波能会部分转化为团簇里分子间势能, 使得氯化钠溶液的电导率与电场强度有关, 这一结果与实验结果符合. 这种微波与氯化钠溶液的相互作用表现出强烈的非线性变化, 应该属于微波的非热效应范畴.

关键词: 微波, 氯化钠水溶液, Langvin方程, 团簇, 氢键, 非热效应

Abstract: The influence of electromagnetic fields on conductivity of aqueousNaCl solution at microwave frequency was studied. The Langvin equation was performed by using an asymmetrical double-well and periodic potential. All runs were started from describing the average hydrogen-bond of cluster configuration in aqueous NaCl solution under the constant temperature conditions. The relation between the conductivity and the probability of hydrogen bonding formation was established by using Bertolini function. When the intensity of microwaves was above 10 kV·m-1, the calculation indicated that microwave energies were partly transformed to intermolecular energies of cluster, which made conductivity interrelated with intensity of microwave. The results agreed well with experiments. The strongly nonlinear change was categorized as one of microwave nonthermal effects.

Key words: Microwaves, Aqueous NaCl solution, Langvin equation, Cluster, Hydrogen-bond, Nonthermal effects