Molecular self-diffusion in internal magnetic fields of porous medium investigated by NMR MGSE method

Stepišnik, Janez (author), Ardelean, Ioan (author), Mohorič, Aleš (author)

Inhomogeneous magnetic fields generated in porous media due to differences in magnetic susceptibility at solid/liquid interfaces and due to intrinsic or artificially doped magnetic impurities can be used to gain insight into the molecular dynamics of fluid in the structure of a porous medium using the concept of NMR modulated gradient spin echo method. We extended the theory of this method to the case of an inhomogeneous magnetic field that cannot be approximated by an uniform gradient, in order to explain the CPMG measurements of self-diffusion in water soaked ceramics, which are doped with magnetic impurities of different contents. The new interpretation provides the spin relaxation times, the average pore size and their distribution, as well as the strength of the internal magnetic gradient fields in the doped ceramics.

• Language: English
• Keywords: nuclear magnetic resonance, MGSE method, magnetic field, magnetic susceptibility, self-diffusion, porous media, NMR spin echo, self-diffusion measurement, very in-homogeneous magnetic field, molecular velocity auto-correlation, magnetic impurities
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: 10 str.
• Numbering: Vol. 328, art. 106981
• PID: 20.500.12556/RUL-138677
• UDC: 537.635
• ISSN on article: 1090-7807
• DOI: 10.1016/j.jmr.2021.106981
• COBISS.SI-ID: 62304515
• Publication date in RUL: 09.08.2022

Record is a part of a journal

• Title: Journal of magnetic resonance
• Shortened title: J. magn. reson.
• Publisher: Elsevier
• ISSN: 1090-7807
• COBISS.SI-ID: 562788

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: jedrska magnetna resonanca, metoda MGSE, magnetno polje, magnetna susceptibilnost, lastna difuzija, porozne snovi

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P1-0060
• Name: Eksperimentalna biofizika kompleksnih sistemov in slikanje v biomedicini

• Funder: Other - Other funder or multiple funders
• Funding programme: Romania, National Authority for Scientific Research
• Project number: PN-III-P4-ID-PCE-2020-0533