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

Autor: Ioan Ardelean, Aleš Mohorič, Janez Stepišnik
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Nuclear and High Energy Physics
Self-diffusion
Materials science
metoda MGSE
Biophysics
magnetic field
010402 general chemistry
01 natural sciences
Biochemistry
porozne snovi
030218 nuclear medicine & medical imaging
03 medical and health sciences
Molecular dynamics
0302 clinical medicine
porous media
Impurity
Condensed Matter::Superconductivity
magnetna susceptibilnost
very in-homogeneous magnetic field
molecular velocity auto-correlation
MGSE method
self-diffusion measurement
magnetic impurities
Condensed matter physics
Doping
self-diffusion
Condensed Matter Physics
Magnetic susceptibility
0104 chemical sciences
Magnetic field
jedrska magnetna resonanca
lastna difuzija
nuclear magnetic resonance
NMR spin echo
magnetno polje
udc:537.635
Spin echo
Condensed Matter::Strongly Correlated Electrons
Porous medium
magnetic susceptibility
Zdroj: Journal of magnetic resonance, vol. 328, no. 106981, 2021.
ISSN: 1090-7807
Popis: 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.
Databáze: OpenAIRE
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