Abstract
Two crystallization exotherms during warming observed with the certain compositions of NaCl-glucose aqueous solution, were investigated by X-ray diffraction. From the results, lower and higher temperature crystallizations are identified as ice and ice/NaCl・2H_2O eutectic formation, respectively. In the case of KCl-glucose aqueous solutions, on the other hand, two kinds of crystallization during warming were observed dependent on their compositions. They are also identified by X-ray diffraction as ice/KCl eutectic formation with a lower glucose concentration solution and ice formation with a higher glucose concentration solution, respectively. A double glass transition phenomenon was observed for the certain compositions of NaCl-glucose aqueous solution vitrified during cooling. The phenomenon was taken as an evidence for the liquid-liquid immiscibility at low temperatures.
