Porous media characterization by PFG and IMFG NMR

Mutina, Albina; Skirda, V. D.

doi:10.1016/j.jmr.2007.05.007

Cited by 6 publications

(4 citation statements)

References 26 publications

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“…However, PFG NMR is not restricted to this field of application as these methods have been used in a pilot study of the pore structure of unconsolidated sediments [Vogt et al, 2002]. Further NMR approaches are diffusion tensor methods or double wave vector diffusionweighting experiments, but also magnetization decay due to diffusion in internal magnetic fields or the combination of NMR relaxation with partial desaturation of the porous media [Basser et al, 1994;Kershaw et al, 2013;Koch and Finsterbusch, 2008;Mitra, 1995;Mohnke, 2014;Mutina and Skirda, 2007;Song, 2003].…”

Section: Introductionmentioning

confidence: 99%

In situ determination of surface relaxivities for unconsolidated sediments

Duschl

Galvosas

Brox

et al. 2015

Water Resources Research

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NMR relaxometry has developed into a method for rapid pore-size determination of natural porous media. Nevertheless, it is prone to uncertainties because of unknown surface relaxivities which depend mainly on the chemical composition of the pore walls as well as on the interfacial dynamics of the pore fluid. The classical approach for the determination of surface relaxivities is the scaling of NMR relaxation times by surface to volume ratios measured by gas adsorption or mercury intrusion. However, it is preferable that a method for the determination of average pore sizes uses the same substance, water, as probe molecule for both relaxometry and surface to volume measurements. One should also ensure that in both experiments the dynamics of the probe molecule takes place on similar length scales, which are in the order of some microns. Therefore, we employed NMR diffusion measurements with different observation times using bipolar pulsed field gradients and applied them to unconsolidated sediments (two purified sands, two natural sands, and one soil). The evaluation by Mitra's short-time model for diffusion in restricted environments yielded information about the surface to volume ratios which is independent of relaxation mechanisms. We point out that methods based on NMR diffusometry yield pore dimensions and surface relaxivities consistent with a pore space as sampled by native pore fluids via the diffusion process. This opens a way to calibrate NMR relaxation measurements with other NMR techniques, providing information about the pore-size distribution of natural porous media directly from relaxometry.

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Section: Introductionmentioning

confidence: 99%

In situ determination of surface relaxivities for unconsolidated sediments

Duschl

Galvosas

Brox

et al. 2015

Water Resources Research

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“…For porous systems, which can be considered models of biological cells, it is possible to estimate their size and permeability. In this case, the dependence of the SDC Ds on the diffusion time td is analyzed under the conditions of the limited diffusion of water in the microvolume of membrane systems [13][14][15][16][17][18][19]. There are three modes of the dependence o the SDC Ds on the diffusion time td: short-term, intermediate, and long-term dependence The ideal form of such a dependence is shown in Figure 3.…”

Section: Figurementioning

confidence: 99%

“…Since in permeable systems (biological cells) there is no mode of completely limited diffusion, i.e., dependence D s ( t d ) ∝

, where n < 1, it is impossible to directly use Equation (3) to determine the pore size a . This situation was considered in detail in [ 14 , 16 , 19 ], where the scaling approach proposed by Skirda V.D. et al was used to analyze the D s ( t d ) dependence.…”

Section: Pulsed Field Gradient Nmr In the Study Of Biological Systemsmentioning

confidence: 99%

Water and Molecular Exchange in Biological Cells Studied Using 1H Pulsed Field Gradient NMR

Avilova

Volkov

2023

Membranes

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This review presents the results of studies of molecular exchange processes in various biological systems (erythrocytes, yeast, liposomes, etc.) performed using pulsed field gradient NMR (PFG NMR). The main theory of processing necessary for the analysis of experimental data is briefly presented: the extraction of self-diffusion coefficients, calculation of cell sizes, and permeability of cell membranes. Attention is paid to the results of assessing the permeability of biological membranes for water molecules and biologically active compounds. The results for other systems are also presented: yeast, chlorella, and plant cells. The results of studies of the lateral diffusion of lipid and cholesterol molecules in model bilayers are also presented.

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“…Its idea is based on analysis of how the diffusion decay curve depends on the diffusion time. In Figure A2 idealized S-shape dependence of the self-diffusion coefficient D s of diffusant molecules on the diffusion time t d in porous systems with permeable walls is shown [ 82 , 83 , 174 , 175 , 183 , 184 , 185 ]. It is known from the literature that the dependence of the SDC of water molecules on the diffusion time in porous systems and biological cells is S-shaped, as shown in Figure A2 .…”

Section: Pulsed Field Gradient Nmr Techniquementioning

confidence: 99%

Molecular and Ionic Diffusion in Ion Exchange Membranes and Biological Systems (Cells and Proteins) Studied by NMR

et al. 2021

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The results of NMR, and especially pulsed field gradient NMR (PFG NMR) investigations, are summarized. Pulsed field gradient NMR technique makes it possible to investigate directly the partial self-diffusion processes in spatial scales from tenth micron to millimeters. Modern NMR spectrometer diffusive units enable to measure self-diffusion coefficients from 10−13 m2/sec to 10−8 m2/sec in different materials on 1 H, 2 H, 7 Li, 13 C, 19 F, 23 Na, 31 P, 133 Cs nuclei. PFG NMR became the method of choice for reveals of transport mechanism in polymeric electrolytes for lithium batteries and fuel cells. Second wide field of application this technique is the exchange processes and lateral diffusion in biological cells as well as molecular association of proteins. In this case a permeability, cell size, and associate lifetime could be estimated. The authors have presented the review of their research carried out in Karpov Institute of Physical Chemistry, Moscow, Russia; Institute of Problems of Chemical Physics RAS, Chernogolovka, Russia; Kazan Federal University, Kazan, Russia; Korea University, Seoul, South Korea; Yokohama National University, Yokohama, Japan. The results of water molecule and Li+, Na+, Cs+ cation self-diffusion in Nafion membranes and membranes based on sulfonated polystyrene, water (and water soluble) fullerene derivative permeability in RBC, casein molecule association have being discussed.

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Porous media characterization by PFG and IMFG NMR

Cited by 6 publications

References 26 publications

In situ determination of surface relaxivities for unconsolidated sediments

In situ determination of surface relaxivities for unconsolidated sediments

Water and Molecular Exchange in Biological Cells Studied Using 1H Pulsed Field Gradient NMR

Molecular and Ionic Diffusion in Ion Exchange Membranes and Biological Systems (Cells and Proteins) Studied by NMR

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