Glass Transition in Fructose‐Water Mixture Studied by Broadband Dielectric Spectroscopy

Broadband dielectric measurements for 86.5, 88.2, and 94.6wt% fructose‐water mixtures were carried out in the frequency range of 2mHz to 20GHz in the temperature range of −30°C to 45°C. Two relaxation processes were observed, in addition to the low frequency electrode polarization and contribution of dc conductivity. The high‐frequency process (β‐process) was observed in the frequency range between 100kHz and 100MHz. The low‐frequency process (α‐process) was observed in the frequency range between 100mHz and 10MHz. The relaxation strength of the β‐process increases and that of the α‐process decreases with increasing water content. Even in the fructose‐water mixture, the each component do not show the respective relaxation process, i. e., the primary α‐process results from the cooperative motion of two components and the β‐process is dominated by the local motion of water molecules.