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Microwave peak absorption frequency of liquid

Microwave peak absorption frequency of liquid,10.1007/s11433-008-0144-0,Science China-physics Mechanics & Astronomy,Guangze Han,Mingdong Chen

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Microwave peak absorption frequency of liquid   (Citations: 1)
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Microwave-assisted extraction is a new effective method which has practical applications in many fields. Microwave heating is one of its physical mechanisms, and it also has the characteristic of selectivity. When the applied microwave frequency equals a certain absorption frequency of the material (or specific component), the material will intensively absorb microwave energy. This is also known as resonant absorption, and the frequency is called the peak absorption frequency which depends on the physical structure of the material. In this work, dynamic hydrogen bond energy was included in molecular activation energy; with the liquid cell model, the expression of interaction energy between dipolar molecules was derived. The rotational relaxation time was gotten from the Eyring viscosity formula. Then based on the relationship between dielectric dissipation coefficient and relaxation time, the expression of microwave peak absorption frequency as a function of the material physical structure, rotational inertia and electrical dipole moment of molecules was established. These theoretical formulas were applied to water and benzene, and the calculated results agree fairly well with the experimental data. This work can not only deepen the study of the interaction between microwave and material, but also provide a possible guide for the experiment of microwave-assisted extraction.
Journal: Science China-physics Mechanics & Astronomy - SCI CHINA-PHYS MECH ASTRON , vol. 51, no. 9, pp. 1254-1263, 2008
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