Abstract
Dielectric properties [dielectric constant (e') and loss factor (e″)] of 8 % and 10% (w/v) bentonite pastes at 2450 MHz were measured from −25C to 90C by the cavity perturbation technique. The dielectric constant decreased as moisture content decreased and temperature increased (temperature ≤ 0C). The relationships between loss factor, moisture content, and temperature were not straight-forward due to the ionic loss (d. c. conductivity). Because of the similarities between bentonite pastes and most food materials in dielectric constant, loss factor, and penetration depth, bentonite pastes can be good model food systems to study microwave heating
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