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- W4255931486 abstract "Publisher SummaryThis chapter introduces the diffusion propagator that is used to consider the dephasing and the refocusing of spins in a T2 measurement in restricted geometries. The chapter focuses on the intrinsic T2 due to volume or surface sinks only and assumes that the field is homogeneous and that the phases of all spins are identical. The chapter considers the effect of diffusion of spins in a fluid-saturated porous medium where the magnetic field is non-uniform. The chapter explains that the average of this propagator can be found by measuring an nuclear magnetic resonance (NMR) spin echo in a “pulsed-field-gradient-spin-echo (PFGSE)” experiment. This is a powerful experimental technique that and is frequently used for measuring the microstructure and diffusion properties of porous media: as the time and spatial dependence of G reflect the detailed microstructure of the pore space, such measurements can provide rather detailed information about that microstructure. Even the more conventional measurements of NMR spin echoes in the presence of a fixed gradient of the polarizing field provide some information about the microstructure and the diffusion in such media." @default.
- W4255931486 created "2022-05-12" @default.
- W4255931486 date "2002-01-01" @default.
- W4255931486 modified "2023-09-27" @default.
- W4255931486 title "Chapter 7 Theory of NMR in fluid-saturated porous media" @default.
- W4255931486 doi "https://doi.org/10.1016/s0950-1401(02)80010-6" @default.
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