Open AccessTemperature dependent dielectric of aqueous NaCl solution at microwave frequency
Author(s) -
Feng Wang,
Guozhu Jia,
Liu Li,
Fenghai Liu,
Liang Wen-Hai
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.048701
Subject(s) - aqueous solution , materials science , dielectric , microwave , dissipation factor , oscillation (cell signaling) , atmospheric temperature range , dielectric loss , analytical chemistry (journal) , thermodynamics , chemistry , optoelectronics , physics , biochemistry , chromatography , quantum mechanics
Dielectric properties of aqueous NaCl solution, which are dependent on temperature (293-353 K), with a concentration in a range of 0.001-0.5 mol/L at microwave frequencies ranging from 200 MHz to 6.25 GHz are studied experimentally. The results indicate that imaginary part decreases with frequency increasing, and tetrahedral structure of H2O and hydrogen bond of aqueous NaCl solution is broken by high temperature, leading to the decreasing of real part of dielectric. The loss angle tangent in solution obviously decreases in a low frequency zone at 353 K compared with that in pure water. Temperature window effect that complex dielectric increases or decreases with temperature varying at 2.45 GHz and 5.8 GHz, thereby leading to the oscillation of dissipation power in microwave heating process and the nonequilibrium distribution of temperature is also confirmed.