Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Molecular dynamics simulations of NMR relaxation and diffusion of bulk hydrocarbons and water

Journal Article · · Journal of Magnetic Resonance
Molecular dynamics (MD) simulations are used to investigate 1H nuclear magnetic resonance (NMR) relaxation and diffusion of bulk n-C5H12 to n-C17H36 hydrocarbons and bulk water. The MD simulations of the 1H NMR relaxation times T1,2 in the fast motion regime where T1 = T2 agree with measured (de-oxygenated) T2 data at ambient conditions, without any adjustable parameters in the interpretation of the simulation data. Likewise, the translational diffusion DT coefficients calculated using simulation con gurations are well-correlated with measured diffusion data at ambient conditions. The agreement between the predicted and experimentally measured NMR relaxation times and diffusion coefficient also validate the force elds used in the simulation. The molecular simulations naturally separate intramolecular from intermolecular dipole-dipole interactions helping bring new insight into the two NMR relaxation mechanisms as a function of molecular chain-length (i.e. carbon number). Comparison of the MD simulation results of the two relaxation mechanisms with traditional hard-sphere models used in interpreting NMR data reveals important limitations in the latter. With increasing chain length, there is substantial deviation in the molecular size inferred on the basis of the radius of gyration from simulation and the tted hard-sphere radii required to rationalize the relaxation times. This deviation is characteristic of the local nature of the NMR measurement, one that is well-captured by molecular simulations.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1543565
Alternate ID(s):
OSTI ID: 1416639
Journal Information:
Journal of Magnetic Resonance, Journal Name: Journal of Magnetic Resonance Journal Issue: C Vol. 277; ISSN 1090-7807
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (30)

Walter Pohl / Gerda Heydemann (Eds.), Post-Roman Transitions. Christian and Barbarian Identities in the Early Medieval West. (Cultural Encounters in Late Antiquity and the Middle Ages, Vol. 14.) Turnhout, Brepols Publishers 2013 journal April 2015
Test liquids for quantitative MRI measurements of self-diffusion coefficient in vivo journal March 2000
Relaxation mechanisms and shales: RELAXATION MECHANISMS AND SHALES journal May 2014
Dispersion of T 1 and T 2 Nuclear Magnetic Resonance Relaxation in Crude Oils journal June 2014
Scalable molecular dynamics with NAMD journal January 2005
PACKMOL: A package for building initial configurations for molecular dynamics simulations journal October 2009
Temperature-Dependent Oxygen Effect on NMR D-$$T_2$$ Relaxation-Diffusion Correlation of n-Alkanes journal September 2016
Numerical integration of the cartesian equations of motion of a system with constraints: molecular dynamics of n-alkanes journal March 1977
Characterization of biomolecular structure and dynamics by NMR cross relaxation journal January 1994
Semi-classical nuclear spin relaxation theory revisited for use with biological macromolecules journal April 2002
Internal motions in proteins and interference effects in nuclear magnetic resonance journal December 2002
NMR measurement of bitumen at different temperatures journal June 2008
Low-field permanent magnets for industrial process and quality control journal January 2014
Evidence of Aromaticity-Specific Maltene NMR Relaxation Enhancement Promoted by Semi-immobilized Radicals journal December 2015
Molecular Dynamics and NMR Spin Relaxation in Proteins journal June 2002
Molecular Modeling of the Volumetric and Thermodynamic Properties of Kerogen: Influence of Organic Type and Maturity journal December 2014
Model-free approach to the interpretation of nuclear magnetic resonance relaxation in macromolecules. 1. Theory and range of validity journal August 1982
System-Size Dependence of Diffusion Coefficients and Viscosities from Molecular Dynamics Simulations with Periodic Boundary Conditions journal October 2004
1 H Nuclear Spin Relaxation of Liquid Water from Molecular Dynamics Simulations journal January 2015
Revised Parameters for the AMOEBA Polarizable Atomic Multipole Water Model journal September 2014
Nonexponential Relaxation of Three‐Spin Systems in Nonspherical Molecules journal August 1969
Proton Spin—Lattice Relaxation of n ‐Paraffins in Solution journal July 1964
Molecular dynamics simulation of a polymer chain in solution journal November 1993
Relaxation Effects in Nuclear Magnetic Resonance Absorption journal April 1948
Nuclear Spin Relaxation by Translational Diffusion journal November 1953
Nuclear magnetic resonance relaxometry of water in two and quasi-two dimensions journal June 2013
Avogadro: an advanced semantic chemical editor, visualization, and analysis platform journal August 2012
Microscopic Dynamics of Water and Hydrocarbon in Shale-Kerogen Pores of Potentially Mixed Wettability journal February 2014
Effect of Capillary Condensation on Gas Transport in Shale: A Pore-Scale Model Study journal April 2016
Mixing Rules and Correlations of NMR Relaxation Time With Viscosity, Diffusivity, and Gas/Oil Ratio of Methane/Hydrocarbon Mixtures journal March 2002

Cited By (9)

Rotational and Translational Diffusion of Proteins as a Function of Concentration journal November 2019
Modulation of Hydrophobic Interaction by Mediating Surface Nanoscale Structure and Chemistry, not Monotonically by Hydrophobicity journal August 2018
Modulation of Hydrophobic Interaction by Mediating Surface Nanoscale Structure and Chemistry, not Monotonically by Hydrophobicity journal August 2018
Direct Correlation between Adsorption Energetics and Nuclear Spin Relaxation in a Liquid-saturated Catalyst Material journal September 2018
Fluid-solid phase transition of n-alkane mixtures: Coarse-grained molecular dynamics simulations and diffusion-ordered spectroscopy nuclear magnetic resonance journal January 2019
Role of internal motions and molecular geometry on the NMR relaxation of hydrocarbons journal April 2018
NMR spin-rotation relaxation and diffusion of methane journal May 2018
Direct Correlation between Adsorption Energetics and Nuclear Spin Relaxation in a Liquid-saturated Catalyst Material. text January 2018
NMR Spin-Rotation Relaxation and Diffusion of Methane text January 2018

Similar Records

NMR spin-rotation relaxation and diffusion of methane
Journal Article · Mon May 21 20:00:00 EDT 2018 · Journal of Chemical Physics · OSTI ID:1543861

Molecular Modes Elucidate the Nuclear Magnetic Resonance Relaxation of Viscous Fluids
Journal Article · Thu Aug 08 20:00:00 EDT 2024 · Journal of Physical Chemistry. B · OSTI ID:2429825

Molecular-Level Insights into the NMR Relaxivity of Gadobutrol Using Quantum and Classical Molecular Simulations
Journal Article · Tue Apr 08 20:00:00 EDT 2025 · Chemical & Biomedical Imaging · OSTI ID:2573493