Measurement of Two Solvation Regimes in Water-Ethanol Mixtures Using X-Ray Compton Scattering

被引：48

作者：

Juurinen, I. ^{[1
]}

Nakahara, K. ^{[2
]}

Ando, N. ^{[2
]}

Nishiumi, T. ^{[2
]}

Seta, H. ^{[2
]}

Yoshida, N. ^{[2
]}

Morinaga, T. ^{[2
]}

Itou, M. ^{[3
]}

Ninomiya, T. ^{[3
]}

Sakurai, Y. ^{[3
]}

Salonen, E. ^{[4
]}

Nordlund, K. ^{[1
]}

Hamalainen, K. ^{[1
]}

Hakala, M. ^{[1
]}

机构：

[1] Univ Helsinki, Dept Phys, FI-00014 Helsinki, Finland

[2] Suntory Business Expert Ltd, Proc Dev Dept, Nakahara Ku, Kawasaki, Kanagawa 2110067, Japan

[3] JASRI, Kouto, Hyogo 6795198, Japan

[4] Aalto Univ Sch Sci & Technol, Dept Appl Phys, FI-00076 Aalto, Finland

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 19期

基金：

芬兰科学院;

关键词：

MOLECULAR-DYNAMICS; BINARY-MIXTURES; HYDROGEN-BOND; RAMAN; SPECTROSCOPY; ASSOCIATION; ENERGETICS; HYDRATION; IR;

D O I：

10.1103/PhysRevLett.107.197401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5

共 38 条

[11] FREE VOLUME AND ENTROPY IN CONDENSED SYSTEMS .3. ENTROPY IN BINARY LIQUID MIXTURES - PARTIAL MOLAL ENTROPY IN DILUTE SOLUTIONS - STRUCTURE AND THERMODYNAMICS IN AQUEOUS ELECTROLYTES [J].