Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Dynamics of Molecular Associates in Methanol/Water Mixtures



Yanqin Zhai, Peng Luo, Jackson Waller, Jeffrey L. Self, Leland Harriger, Y. Z., Antonio Faraone


The dynamics of molecular associates in methanol/water mixtures was investigated using quasielastic neutron scattering. By measuring the signal from four methanol/water samples differing only by their isotopic composition, the relative motion of the water to methanol molecules, i.e. their mutual dynamics, was measured at the nanoscale. The thus obtained nanoscopic mutual diffusion coefficient signals a significantly slower process than the single particle diffusion of either methanol or water in the system as well as than their macroscopic mutual diffusion. The data do not provide any indication of microsegregation in this preeminent alcohol/water mixture; however, they do indicate the existence of long lived but dynamic molecular associates of water and methanol molecules. Analysis of the structural relaxation shows that the lifetime of molecular association through hydrogen bonding determines the fact that viscosity of the mixtures at intermediate concentrations is higher than that of both pure components.
Physical Chemistry Chemical Physics


Water, methanol, association, hydrogen bond


Zhai, Y. , Luo, P. , Waller, J. , Self, J. , Harriger, L. , Z., Y. and Faraone, A. (2022), Dynamics of Molecular Associates in Methanol/Water Mixtures, Physical Chemistry Chemical Physics (Accessed May 30, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created January 25, 2022, Updated November 29, 2022