Unique cooperative motion of water-Liquid to glass of aqueous solutions

在1 MHz-30 GHz的频率范围内，在80K-300K的温度范围内对各种水溶液进行了宽带介电测量。为水溶液引入的溶质有甘油、丙醇、乙二醇、乙二醇齐聚物、果糖、聚合物和蛋白质。在玻璃化转变温度附近，均观察到水分子和溶质分子的协同运动引起的一次弛豫和水分子局部运动引起的二次弛豫。由于水合蛋白质、水溶液和van der Waals液体混合物的性质相似，我们将在最后一个系统的研究中获得的理论理解依次转移到另外两个日益复杂的系统。初级过程和次级过程是不可分割或共生的过程。

Broadband dielectric measurements were performed at temperatures between 80K and 300K in the frequency range of 1 mHz-30 GHz for various kinds of aqueous solutions. The solutes introduced for the aqueous solutions were glycerol, propanol, ethylene glycol, ethyleneglycol oligomers, fructose, polymers, and proteins. The primary relaxation originated from cooperative motion of water and solute molecules and the secondary relaxation due to local motion of water molecules were observed at around the glass transition temperature for all the aqueous solutions. Since the properties of hydrated proteins, aqueous solutions, and the mixtures of van der Waals liquids are similar, we transfer the theoretical understanding gained in the study of the last systems sequentially to the two other increasingly more complex systems. The primary and secondary processes are inseparable or symbiotic processes.