DMF水溶液的等效介电常数特异性  

Specific Phenomenon of Effective Permittivity for DMF-H_2O Solution

作　　者：贾国柱[1] 黄卡玛[1] 杨晓庆[1] 宋建平[1] 杨利君[1] 

机构地区：[1]四川大学电子信息学院,成都610065

出　　处：《物理化学学报》2009年第9期1906-1910,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金重点项目(60531010)资助~~

摘　　要：在288、298和313K三个温度和2.45GHz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.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.

关 键 词：混合溶液 等效介电常数 特异性 混合物公式 氢键 

分 类 号：O621.2[理学—有机化学]