Abstract
In order to know the growth shapes of ice crystals in supercooled aqueous solutions of trehalose, in-situ
observations of growing ice crystals were performed varying the concentrations of trehalose and the degrees
of supercooling (ΔT). The ice crystals were covered with transparent thin glassy films and the surfaces of
frozen solutions were smooth enough to focus on the entire visual field of an optical microscope. The
shape of each ice crystal was usually dendritic and the diameter of each branch became smaller with
increasing concentrations of trehalose and ΔT. In case of 3.18 molal and ΔT=21.8 K, the shape of each ice
crystal was small and spherical, and such ice crystals were separated with each other by a thin transparent
glassy film.
