Concentration fluctuation in alcohol-water mixture : Is the structural aspect of poly-disperse mass-fractal universal?

醇-水混合物的中尺度结构以浓度波动或微观非均匀性为特征。然而，浓度波动的结构细节和波动的分子起源仍然不清楚。需要对醇混合物的介观结构进行更详细的结构研究。我们以前报道过的1-丙醇-水混合物的介观结构的特点是多分散质量分形通过一个新开发的可视化分析的小角中子散射强度。本研究的目的是检查是否这种结构方面的多分散质量分形是常见的在其他酒精-水混合物。为此，我们对叔丁醇-水进行了小角中子散射测量。从分形的角度分析了混合物的浓度波动。浓度波动的结构已通过一个可视化的方法， ...更多信息 大规模反向蒙特卡罗技术。可视化结构的逾渗分析表明，浓度波动的特点是多分散质量分形，这已被发现的1-丙醇-水混合物。这些发现强烈地表明多分散质量分形是各种醇-水混合物的共同结构特征。我们还将可视化技术应用于液体Rb-Se和Bi-Br混合物，以了解这些液体的短程和中程结构。结果发现，在Rb-Se混合物的可视化模型结构中存在许多空洞。从空洞分析使用Delaunay simplices它已被揭示，所观察到的前峰对应于一个前峰的浓度-浓度结构因子由于化学有序包装的空隙和Se链的结构。我们强调，可视化的介观结构是至关重要的，以了解在各种液体混合物的复杂性。少

The mesoscale structure of alcohol-water mixtures is characterized by concentration fluctuation or micro-heterogeneity. However the structural details of the concentration fluctuation and the molecular origin of the fluctuation are still obscure. More detailed structural studies on the mesoscale structure of the alcohol mixtures are needed. We reported previously that the mesoscale structure of the 1-propanol-water mixtures was characterized by poly-disperse mass-fractals by means of a newly developed visualization-analysis of small angle neutron scattering intensity. The purpose of this study is to examine whether this structural aspect of the poly-disperse mass-fractals is commonly observed in other alcohol-water mixtures. For this purpose we have carried out small angle neutron scattering measurement on tert-butyl alcohol-water. Concentration fluctuation of the mixture has been analyzed in terms of fractal. Structure of the concentration fluctuation has been visualized by means of a … More large-scale reverse Monte Carlo technique. Percolation analysis of the visualized structure shows that the concentration fluctuation is characterized by poly-disperse mass fractals, which has been found for 1-propano-water mixture. These findings strongly suggest that the poly-disperse mass-fractal is a common structural characteristic in various alcohol-water mixtures.We have also applied the visualization technique to liquid Rb-Se and Bi-Br mixtures in order to understand the short-range and intermediate-range structures of these liquids. It was found that there were many voids in the visualized model structure of Rb-Se mixtures. From the void analysis using Delaunay simplices it has been revealed that the observed pre-peak corresponds to a pre-peak in the concentration-concentration structure factor due to the chemically ordered packing of the voids and Se chains in the structure.We emphasize that the visualization of the mesoscale structure is essentially important to understand the complexity in various liquid mixtures. Less