Related Experiment Video
Updated: Jul 2, 2026

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
Published on: October 9, 2020
Spin-diffusion NMR at low field for the study of multiphase solids
M Mauri1, Y Thomann, H Schneider
1Institut für Physik, Martin-Luther Universität Halle-Wittenberg, Friedemann-Bach-Platz 6, D-06108 Halle, Germany.
Spin-diffusion NMR can now accurately measure domain sizes in heterogeneous polymers, even at low magnetic fields. This new method accounts for T(1) relaxation, improving domain size analysis.
Area of Science:
- Materials Science
- Polymer Science
- Nuclear Magnetic Resonance (NMR) Spectroscopy
Background:
- Spin-diffusion NMR is a valuable tool for determining domain sizes in multiphase materials, especially heterogeneous polymers.
- Existing analytical solutions are often limited to high magnetic fields where T(1) relaxation is negligible.
- Extending spin-diffusion NMR to low-field conditions, where T(1) relaxation is significant, is crucial for broader applicability.
Purpose of the Study:
- To comprehensively study magnetization diffusion in a model copolymer at low magnetic field, considering the impact of T(1) relaxation.
- To develop and validate a numerical simulation for spin-diffusion NMR that incorporates longitudinal relaxation.
- To assess and improve correction strategies for initial-slope analysis in the presence of T(1) effects.
Main Methods:
- Developed a numerical simulation based on the diffusion equation, including longitudinal relaxation (T(1)).
- Investigated magnetization diffusion in a model copolymer at low magnetic field.
- Compared results with Transmission Electron Microscopy (TEM) and full simultaneous fitting of spin-diffusion and saturation-recovery curves.
Main Results:
- A novel strategy accurately reproduces domain sizes determined by TEM and full fitting methods.
- The developed numerical simulation effectively accounts for T(1) relaxation effects.
- Simultaneous fitting of spin-diffusion and saturation-recovery data yields accurate domain sizes, T(1) relaxation times, and spin-diffusion coefficients.
Conclusions:
- The developed numerical approach extends spin-diffusion NMR to low-field applications with significant T(1) relaxation.
- Accurate domain size measurements are achievable by accounting for T(1) effects and using simultaneous data fitting.
- The study provides practical insights into analyzing complex NMR signals from heterogeneous materials.
More Related Videos
08:55Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
14:55Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
Published on: September 17, 2017
Related Concept Videos
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Atomic Nuclei: Nuclear Spin State Population Distribution
NMR Spectroscopy: Spin–Spin Coupling
Two-Dimensional (2D) NMR: Overview
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
Spin–Spin Coupling Constant: Overview
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
Other Nuclides: 31P, 19F, 15N NMR
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a high...