Dynamics of water in the partially crystallized gelatin water mixture

Abstract

Dielectric relaxation process of water was investigated for 30 wt% gelatin-water mixture at frequencies between 1 MHz and 50 GHz in subzero temperatures down to -50 C. Below the melting temperature Tm, part of water crystallized and another part of water, uncrystallized water (UCW) , remained in a liquid state with gelatin in an uncrystallized phase. At Tm, the relaxation strength, relaxation time, and relaxation time distribution change adruptly, and their subsequent changes with decreasing temperature are larger than those above Tm. These large temperature dependences below Tm can explained by the increase in gelatin concentration in the uncrystallized phase Cg,UCP with decreasing temperature.