Characterization of porous media using NMR methods

Barrie, Patrick J.

doi:10.1016/s0066-4103(00)41011-2

Cited by 102 publications

(85 citation statements)

References 286 publications

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“…Given the single measurable T2 component, the water molecules in the first monolayer, which have their own surface relaxation time, are in rapid exchange with the water molecules of the other layer(s) (Zimmerman and Brittin, 1957, Barrie, 2000, Mitchell et al, 2005. The characterization of the individual layers is therefore not possible by T 2 relaxation time measurements, at room temperature, when these populations are in contact.…”

Section: Nmr Results On Hydrated Samplesmentioning

confidence: 99%

Porosities accessible to HTO and iodide on water-saturated compacted clay materials and relation with the forms of water: A low field proton NMR study

Montavon

Guo

Tournassat

et al. 2009

Geochimica et Cosmochimica Acta

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. Porosities accessible to HTO and iodide on water-saturated compacted clay materials and relation with the forms of water: A low field proton NMR study. Geochimica et Cosmochimica Acta, Elsevier, 2009, 73 (24) AbstractThe aim of the present work was to quantify accessible porosities for iodide and for a water tracer (HTO) on water-saturated compacted clay samples (illite, montmorillonite and MX-80 bentonite) and to relate these macroscopic values to the forms of water in these porosities (surface/bulk water, external/internal water). Low field proton NMR was used to characterize and quantify the forms of water. This enabled the three different populations (structural OH, external surface and internal surface water) to be differentiated on hydrated clays by considering the difference in proton mobility. An accurate description of the water forms within the different populations did not appear possible when water molecules of these populations were in contact because of the occurrence of rapid exchange reactions. For this 2 reason, it was not possible to use the low resolution NMR method to quantify external surface and bulk water in fully water-saturated compacted clay media at room temperature. This latter information could however be estimated when analyzing the samples at -25°C. At this temperature, a distinction based on the difference in mobility could be made since surface water remained in a semi-liquid state whereas bulk water froze. In parallel, accessible porosities for anions and HTO were determined by an isotopic dilution method using capillaries to confine the materials. HTO was shown to probe the whole pore volume (i.e. the space made of surface and bulk water). When the surface water volume was mainly composed of interlayer water (case of montmorillonite and bentonite), iodide was shown to be located in the pore space made of bulk water. When the interlayer water was not present (case of illite), the results showed that iodide could access a small fraction of the surface water volume localized at the external surface of the clay particles.

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Section: Nmr Results On Hydrated Samplesmentioning

confidence: 99%

Porosities accessible to HTO and iodide on water-saturated compacted clay materials and relation with the forms of water: A low field proton NMR study

Montavon

Guo

Tournassat

et al. 2009

Geochimica et Cosmochimica Acta

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“…These techniques range from the simplistic, such as crushing, imbibition, and microscopy (optical or electron), to the most complex Small-Angle Neutron Scattering (SANS) measurements requiring the use of a particle accelerator or nuclear reactor. Pore size distributions can be obtained using gas adsorption (usually with nitrogen) (Brunauer et al, 1938;Barrett et al, 1951), Differential Scanning Calorimetry (DSC) thermoporosimetry (Brun et al, 1977), Mercury Intrusion Porosimetry (MIP) (Ritter and Drake, 1945), SANS (Feigin and Svergun, 1987), and various Nuclear Magnetic Resonance (NMR) techniques (Watson and Chang, 1997;Barrie, 2000). Some of these methods, notably gas adsorption, DSC thermoporosimetry, and most NMR measurements, probe the surface-to-volume (S/V ) ratio of the pore structure and assumptions have to be made about the pore geometry to derive a characteristic length scale (radius or diameter) for the porous matrix.…”

Section: Introductionmentioning

confidence: 99%

Nuclear magnetic resonance cryoporometry

2008

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Nuclear Magnetic Resonance (NMR) cryoporometry is a technique for non-destructively determining pore size distributions in porous media through the observation of the depressed melting point of a confined liquid. It is suitable for measuring pore diameters in the range 2 nm -1 µm, depending on the absorbate. Whilst NMR cryoporometry is a pertabative measurement, the results are independent of spin interactions at the pore surface and so can offer direct measurements of pore volume as a function of pore diameter. Pore size distributions obtained with NMR cryoporometry have been shown to compare favourably with those from other methods such as gas adsorption, DSC thermoporosimetry, and SANS. The applications of NMR cryoporometry include studies of silica gels, bones, cements, rocks and many other porous materials. It is also possible to adapt the basic experiment to provide structural resolution in spatially dependent pore size distributions, or behavioural information about the confined liquid.

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“…The relative simplicity and non-invasive character of PGSE measurements made them an attractive and efficient tool for characterizing porous media (17,18). This tool is largely used in various application fields, from lung or brain diffusion-weighted imaging in medicine (19,20) to sedimentary rock analysis in oilrecovery industry (21,22).…”

Section: Restricted Diffusionmentioning

confidence: 99%

Use, misuse, and abuse of apparent diffusion coefficients

Grebenkov

2010

Concepts Magnetic Resonance

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ABSTRACT:The notion of effective, time-dependent or, equivalently, apparent diffusion coefficient (ADC) and its use for characterization of porous media are revisited. It is argued that the dynamic ADC, quantifying the mean-square displacement of spin-bearing particles, should not be confused with its counterpart measured by a pulsed gradient spin echo technique. The former is an intrinsic characteristic of the medium, independent of the applied magnetic field. In contrast, the spin-echo ADC depends on the experimental setup (e.g., gradient intensity and temporal profile), raising potential ambiguities in the interpretation of diffusion-weighted measurements, which may be strongly misleading when the Gaussian phase approximation (GPA) does not hold. The oversimplified use of a single b-value is criticized. Several fitting models beyond the GPA are discussed.

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Characterization of porous media using NMR methods

Cited by 102 publications

References 286 publications

Porosities accessible to HTO and iodide on water-saturated compacted clay materials and relation with the forms of water: A low field proton NMR study

Porosities accessible to HTO and iodide on water-saturated compacted clay materials and relation with the forms of water: A low field proton NMR study

Nuclear magnetic resonance cryoporometry

Use, misuse, and abuse of apparent diffusion coefficients

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