NMR Based Diffusion Pore Imaging by Double Wave Vector Measurements

TL;DR

This paper introduces a novel NMR diffusion technique using double wave vector measurements with short gradient pulses, enabling direct pore shape determination without prior knowledge, and offering greater flexibility in sequence design.

Contribution

The method allows for shape determination of arbitrary closed pores using only short diffusion pulses, reducing relaxation time constraints and enabling flexible NMR sequences.

Findings

Successfully reveals pore shapes without prior assumptions.

Reduces requirements on relaxation times.

Enables use of stimulated echoes in NMR sequences.

Abstract

In porous material research, one main interest of nuclear magnetic resonance (NMR) diffusion experiments is the determination of the exact shape of pores. It has been a longstanding ques-tion if this is achievable in principle. In this work, we present a method using short diffusion gradient pulses only, which is able to reveal the shape of arbitrary closed pores without rely-ing on a priori knowledge. In comparison to former approaches, the method has reduced de-mands on relaxation times and allows for a more flexible NMR sequence design, since, for example, stimulated echoes can be used.