物理化学学报 >> 2009, Vol. 25 >> Issue (09): 1906-1910.doi: 10.3866/PKU.WHXB20090922

研究论文 上一篇    下一篇

DMF水溶液的等效介电常数特异性

贾国柱, 黄卡玛, 杨晓庆, 宋建平, 杨利君   

  1. 四川大学电子信息学院, 成都 610065
  • 收稿日期:2009-03-31 修回日期:2009-06-09 发布日期:2009-09-03
  • 通讯作者: 贾国柱 E-mail:jia1689500@126.com

Specific Phenomenon of Effective Permittivity for DMF-H2O Solution

JIA Guo-Zhu, HUANG Ka-Ma, YANG Xiao-Qing, SONG Jian-Ping, YANG Li-Jun   

  1. School of Electronics and Information Engineering, Sichuan University, Chengdu 610065, P. R. China
  • Received:2009-03-31 Revised:2009-06-09 Published:2009-09-03
  • Contact: JIA Guo-Zhu E-mail:jia1689500@126.com

摘要:

在288、298和313 K三个温度和2.45 GHz频率下利用微扰谐振腔法测量N,N-二甲基甲酰胺(DMF)、水(H2O)及其混合溶液的等效介电常数过程中, 发现了混合溶液介电损耗虚部大于其中任一组分的介电损耗虚部的特异现象. 理论计算表明, 出现这种特异现象的原因是DMF 和水混合后其高频摩擦项引起的. 这就意味着在混合溶液中, 新的等效介电常数计算公式中必需引入氢键贡献来解释这种特异现象.

关键词: 混合溶液, 等效介电常数, 特异性, 混合物公式, 氢键

Abstract:

The permittivities of N,N-dimethylformamide (DMF), water (H2O), and DMF-H2O mixture solution were measured by a resonant cavity perturbation method at 2.45 GHz and 288, 298, and 313 K. The measured results showed a specific phenomenon wherein the imaginary part of the solution's permittivity was larger than that of each of the components. A theoretical calculation indicates that the reason for this phenomenon is high frequency friction increasing in the DMF and H2O mixture. This implies that a new formula needs to be formulated to include hydrogen bond contributions for the explanation of this specific phenomenon.

Key words: Mixture solution, Effective permittivity, Specific phenomenon, Mixture formula, Hydrogen bond

MSC2000: 

  • O646