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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

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Published on: December 4, 2017

Low-temperature water dynamics in an aqueous methanol solution.

C E Bertrand¹, W-S Chiang, M Tyagi

¹Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

The Journal of Chemical Physics

|July 5, 2013

Summary

Quasielastic neutron scattering reveals water dynamics in methanol solutions. A transition to sub-Arrhenius behavior suggests the formation of small crystallites, indicating mixture structuring.

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Area of Science:

Physical Chemistry
Materials Science
Neutron Scattering

Background:

Understanding the dynamics of aqueous solutions is crucial for various chemical processes.
Methanol-water mixtures exhibit complex behavior due to hydrogen bonding.

Purpose of the Study:

To investigate the single-particle dynamics of water in an aqueous methanol solution.
To explore the temperature dependence of relaxation times and identify structural transitions.

Main Methods:

Quasielastic neutron scattering (QENS) was employed to study water dynamics.
Deuterated methanol was used to isolate the dynamics of single water particles.
Data was compared with molecular dynamics simulations and nuclear magnetic resonance (NMR) measurements.

Main Results:

A smooth dynamic transition to a sub-Arrhenius temperature dependence was observed in water relaxation times.
This transition is associated with the formation of small crystallites within the methanol-water mixture.
Dynamic signatures of structuring in the mixture were discussed.

Conclusions:

The study provides insights into the dynamic behavior of water in aqueous methanol solutions.
Evidence suggests the formation of micro-structured domains, possibly crystallites, influencing water dynamics.
QENS is a powerful technique for probing molecular dynamics and structural changes in liquid mixtures.