Dear Sirs,
I know the works by Mitra (surface to volume ratio in porous media) on diffusion coefficient dependence on short times. See
P. P. Mitra, P. N. Sen, L. M. Schwartz, Short-time behavior of the diffusion coefficient as a geometrical probe of porous media, Phys. Rev. B, Vol. 47, pp. 8565-8574 (1993)
There are also theories of long range diffusion which together with Mitra`s theory help to determine the pore radius for glass packs. See
L.L. Latour et al., Pore-size distributions and tortuosity in heterogeneous porous media. J. Magn. Reson. Ser. A 112(1), 83–91 (1995)
I have the following questions.
Could we account for the adsorption at the pore surface for real pore geometry?
Could we determine the mean pore size in case of the arbitrary pore geometry or for some sorts of pores geometries?
I would be very appreciate for modern review on PFG NMR restricted diffusion determination of structure of porous media. Thank you for an advance!!
The publication below might help you too. It is not directly related to pores; however the concepts are derived from the same papers above. The good point of our notation(i. e. introduction of parameter alpha) is that restriction is viewed from two perspectives: diffusion time and cavity size.
DOI: 10.1002/mrm.26230
Dear Mr. Nima Gilani,
I would be appreciate if you could send your article. Thank you for an advance.
Anatoly A. Khripov
Dear Dr. Khirpov,
I just sent the paper(s). I read your interesting work "METHOD OF RAPID REMOTE CONTROL OF CASEIN CONCENTRATION IN DAIRY PRODUCTS IN UNOPENED PACKAGES". In the results and discussion section, you have hypothesized that we have two different diffusion coefficients in the solution, one is the free water and the other one is slow moving protons constrained by casein micelles. How do you prove that? Does it mean in solutions, we have different diffusion coefficients, or could we have a uniform diffusion coefficient in the solution? Is there any observation of these two different diffusion coefficients?
Best Regards
Nima
Dear Sirs,
Could anybody share his work on PFG NMR study in porous media, particularly in the ureter and other human body parts? Thank you for an advance
I know another two ways of interpreting the time dependence diffusion experiment to pore size determine:
1) determination of the size of steric restrictions in the limit of long diffusion times (so called long-time )diffusion regime) by Skirda V.D. et al.
2) generalization of Mitra's and Skirda's solutions for full diffusion times range by Loskutov et al.
Morove, there are solutions to determine the S/V ratio in the limit of infinite diffusion times by Strange et al, and Loskutov et. al
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