TED-AJ03-274 Dielectric Property of Ice for Rapid and Uniform Dielectric Heating : for thawing ice crystals in biological materials

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The thawing of ice without the thermal runaway is very important for thawing frozen foods, cells and tissues. An alternative current (AC) electric field of specific frequency depending on dielectric property spectrum might allow ice to be heated selectively. Although 70% of foods or biomaterials are composed of electric conductive electrolytes solution (about 300mosmol/kg), ice crystals in biomaterials rarely include other components. Therefore, it is very important to know electric property of ice itself in order to control phase change of ice crystals in biomaterials. In the present study, the dielectric loss spectrum of ice was measured at various temperatures using the experimental setup shown in Fig. A-1 (-60℃ to -2℃). To confirm the dielectric loss spectrum, high power AC electric fields of several frequencies were applied to ice, with which heat-generation spectrum pattern of ice were roughly obtained. In addition, a numerical simulation of one-dimensional heat transfer regarding heat generation due to dielectric loss was performed. The measurement of ice dielectric-loss spectrum showed the relaxation-loss around 100Hz to 10kHz depending on its temperature (Fig. A-2). A weak resonance-like-loss was also detected at 3MHz. Though the mechanism of this resonance-like-loss is unknown, heat-generation spectrum was compatible with its dielectric-loss spectrum. The numerical simulation suggested the possibility of rapid and uniform heating of ice with alternative electric fields of specific frequency where the dielectric loss decreases as temperature increases. It is analytically proved that the resonance-loss shows decrease of dielectric loss as temperature increases.[figure]
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TED-AJ03-274 Dielectric Property of Ice for Rapid and Uniform Dielectric Heating : for thawing ice crystals in biological materials

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