Low-temperature water dynamics in an aqueous methanol solution

被引：5

作者：

Bertrand, C. E. ^{[1
]}

Chiang, W. -S. ^{[1
]}

Tyagi, M. ^{[2
,3
]}

Chen, S. -H. ^{[1
]}

机构：

[1] MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA

[2] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[3] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

来源：

JOURNAL OF CHEMICAL PHYSICS | 2013年 / 139卷 / 01期

基金：

美国国家科学基金会;

关键词：

NUCLEAR-MAGNETIC-RESONANCE; STRONG LIQUID TRANSITION; X-RAY-DIFFRACTION; WATER/METHANOL MIXTURES; CONFINED WATER; NEUTRON; SEGREGATION; CROSSOVER; ETHANOL; MODEL;

D O I：

10.1063/1.4812286

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

An aqueous methanol solution (x(MeOH) = 0.30) has been studied by quasielastic neutron scattering. The single-particle water dynamics were effectively isolated by employing deuterated methanol. A smooth dynamic transition to a sub-Arrhenius temperature dependence has been observed in the relaxation times. We associate this behavior with the formation of small crystallites in the system. These findings are compared with molecular dynamics simulations and previous nuclear magnetic resonance measurements. We discuss possible dynamic signatures of structuring in the mixture. (C) 2013 AIP Publishing LLC.

引用

页数：8

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