Complex permittivities of cyclomaltooligosaccharides (cyclodextrins) over microwave frequencies to 26 GHz

摘要

Complex permittivities (#epsilon#~*)for microwave radiation between 0.5 and 26 GHz have been determined for #alpha#-,#beta#-,and #gamma#-cyclodextrins in the solid state at room temperature. For the real component of #epsilon#~*, maxima occur near 0.6 GHz, and the relation #beta#>#alpha#>#gamma# is evident across the full-frequency spectrum. Dielectric loss is significant only between 5 and 12 GHz for #beta#- and #gamma#-cyclodextrins with maxima near 7.5 GHz.