抄録
In the foregoing study [J. Adv. Sci. 7, 1 (1995)] supercooling solidifications of NaCl aqueous solution, as an example, were reported. In the present study, the solidification of other two kinds of binary solution such as aqueous solutions of sucrose and ethylne glycol has been investigated. Liquid layer is about 0.2mm thick. Fractal analyses are made for dendrite-patterns obtained for various concentrations of these solution. Dendrite grown from these solutions are found to be fractal over two orders of dimensions, and their fractal dimensions D are determined by the use of the box-counting method. The fractal dimension D changes their values as they grow. They vary according as a kind of saturation curve. D approaches a constant D∞. Values of D∞ for these two solutions are alomost the same: D∞=1.919 for ethylene glycol and 1.917 for sucrose aqueous solutions in case of the concentration of 8.0wt%. In the case of thick layer of 0.08mm, dendritic ices grow which forms multilayer dendrites. Therefore, dendrites have a slightly larger D value for those grown in the thick liquid layer than in a thin layer.
