Nakada Masaru, Maruyama Kenji, Yamamuro Osamu, Misawa Masakatsu
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan.
J Chem Phys. 2009 Feb 21;130(7):074503. doi: 10.1063/1.3073881.
The dynamics of water molecules in the n-propyl alcohol-water mixtures is investigated by using quasielastic neutron scattering measurements. The dynamic structure factor S(Q,E) obtained from incoherent scattering of hydrogen atoms of water is fitted with jump diffusion and relaxing cage models. The diffusion constant obtained from the relaxing cage model, which gives better fitting with S(Q,E), shows better agreement to the experimental value than that of jump diffusion model. The dependence of translational relaxation time tau(T)(Q) and stretched exponent beta(T)(Q) on the fraction of hydrophobic hydrating water molecules in the solution is discussed.
通过准弹性中子散射测量研究了正丙醇 - 水混合物中水分子的动力学。从水分子氢原子的非相干散射获得的动态结构因子S(Q,E) 采用跳跃扩散和弛豫笼模型进行拟合。从弛豫笼模型获得的扩散常数与S(Q,E) 的拟合效果更好，与实验值的一致性比跳跃扩散模型更好。讨论了平移弛豫时间tau(T)(Q) 和拉伸指数beta(T)(Q) 对溶液中疏水水合水分子分数的依赖性。
