Measurement of two solvation regimes in water-ethanol mixtures using x-ray compton scattering.
Measurement of two solvation regimes in water-ethanol mixtures using x-ray compton scattering.
复制标题
使用 X 射线康普顿散射测量水-乙醇混合物中的两种溶剂化状态。
DOI：
--
复制
发表时间：
2011
影响因子：
8.6
通讯作者：
M. Hakala
中科院分区：
文献类型：
--
作者：
I. Juurinen;K. Nakahara;N. Ando;T. Nishiumi;H. Seta;N. Yoshida;T. Morinaga;M. Itou;T. Ninomiya;Yoshiharu Sakurai;E. Salonen;Kai Nordlund;K. Hämäläinen;M. Hakala
水-乙醇混合物在其宏观性质中表现出有趣的异常。尽管进行了大量的研究，但异常的起源和微观结构本身仍然远未完全了解。我们利用同步辐射X射线康普顿散射技术从一个新的实验角度阐明了乙醇水溶液的结构。该技术是唯一敏感的局部分子几何形状在埃和亚埃尺度。实验揭示了两种不同的混合制度的几何形状：稀释的5摩尔%和浓缩的>15摩尔%的制度。通过与纯液体比较，前者的特点是分子内和后者的分子间的变化。这一发现为评价稀浓度下笼形结构形成的假说提供了新的思路。
Water-ethanol mixtures exhibit interesting anomalies in their macroscopic properties. Despite a lot of research, the origin of the anomalies and the microscopic structure itself is still far from completely known. We have utilized the synchrotron x-ray Compton scattering technique to elucidate the structure of aqueous ethanol from a new experimental perspective. The technique is uniquely sensitive to the local molecular geometries at the angstrom and subangstrom scales. The experiments reveal two distinct mixing regimes in terms of geometry: the dilute 5 mol % and the concentrated >15 mol % regimes. By comparing with pure liquids, the former regime is characterized by an intramolecular and the latter by an intermolecular change. The findings bring new light to evaluating the hypothesis of formation of clathratelike structures at the dilute concentrations.
影响因子：
3.3
作者：
Noskov, SY;Lamoureux, G;Roux, B
通讯作者：
Roux, B