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Temperature dependent dielectric of aqueous NaCl solution at microwave frequency

Wang Feng Jia Guo-Zhu Liu Li Liu Feng-Hai Liang Wen-Hai

Temperature dependent dielectric of aqueous NaCl solution at microwave frequency

Wang Feng, Jia Guo-Zhu, Liu Li, Liu Feng-Hai, Liang Wen-Hai
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  • Abstract views:  2115
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  • Received Date:  18 May 2012
  • Accepted Date:  14 September 2012
  • Published Online:  05 February 2013

Temperature dependent dielectric of aqueous NaCl solution at microwave frequency

  • 1. College of Physics and Electronics Engineering, Sichuan NormalUniversity, Chengdu 610066, China
Fund Project:  Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 61102044).

Abstract: 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.

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