Dielectric studies of glycine-ethylene glycol-water solutions using time domain reflectometry

被引:4
|
作者
Chaudhari, A
Shankarwar, AG
Arbad, BR
Mehrotra, SC
机构
[1] Dr BAM Univ, Dept Elect & Comp Sci, Aurangabad 431004, Maharashtra, India
[2] Dr BAM Univ, Dept Chem, Aurangabad 431004, Maharashtra, India
关键词
dielectric relaxation; time domain reflectometry; water-ethylene glycol-glycine solutions;
D O I
10.1023/B:JOSL.0000026643.44056.f2
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Time domain reflectometry (TDR) has been used for dielectric relaxation measurements on the glycine-ethylene glycol-water ternary system (TDR) at 25, 30, 35, and 40degreesC in the frequency range from 10 MHz to 10 GHz. Glycine-ethylene glycol-water solutions are prepared with different concentrations of ethylene glycol (0, 5, 10, 15, 20, and 30%) and also for different glycine molar concentrations (0, 0.2, 0.4, 0.6, 0.8, and 1 M). The dielectric relaxation parameters are measured for aqueous glycine solutions also to compare the results with those for the glycine-ethylene glycol-water ternary system. For all the solutions considered, only one relaxation peak was observed in this frequency range. The complex permittivity spectra for the aqueous glycine solutions can be well described by the Cole-Davidson expression, whereas that for the ternary system can be well described by the Havriliak-Negami expression. The logarithm of the relaxation time log(tau) shows a nonlinear relation with the glycine molar concentration that implies a change in the relaxation mechanism with glycine concentration. The dielectric strength Deltaepsilon increases with an increase in glycine molar concentration, whereas it decreases with an increase in ethylene glycol concentration.
引用
收藏
页码:23 / 31
页数:9
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