High-pressure low-field 1H NMR relaxometry in nanoporous materials

Horch, Carsten; Schlayer, Stefan; Stallmach, Frank

doi:10.1016/j.jmr.2014.01.002

Cited by 27 publications

(19 citation statements)

References 41 publications

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“…1). This polymer has no influence on the NMR results because its protons exhibit a very low mobility [38]. In addition, PEEK provides a high mechanical strength to the set up.…”

Section: Strained Nmr Setupmentioning

confidence: 99%

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Microstructure and deformation mechanisms of a solid propellant using 1 H NMR spectroscopy

Azoug

Constantinescu

Nevière

et al. 2015

Fuel

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“…1). This polymer has no influence on the NMR results because its protons exhibit a very low mobility [38]. In addition, PEEK provides a high mechanical strength to the set up.…”

Section: Strained Nmr Setupmentioning

confidence: 99%

“…In addition, PEEK provides a high mechanical strength to the set up. Several teams have built similar setups dedicated to NMR spectrometry of strained specimens [21,28,[38][39][40][41].…”

Section: Strained Nmr Setupmentioning

confidence: 99%

Microstructure and deformation mechanisms of a solid propellant using 1 H NMR spectroscopy

Azoug

Constantinescu

Nevière

et al. 2015

Fuel

View full text Add to dashboard Cite

“…Among existing analytical technics, nuclear magnetic resonance (NMR) has strongly advanced our understanding about the MOF materials in terms of structure, dynamics of the linker, and motion and diffusion of adsorbed molecules by taking advantage of dedicated high-field NMR devices and sophisticated experimental techniques [36][37][38][39][40][41][42][43]. Yet, useful microscopic information can also be gained with the help of less expensive compact low-field NMR sensors with open and closed magnet geometries.…”

Section: Introductionmentioning

confidence: 99%

Screening Metal–Organic Frameworks for Separation of Binary Solvent Mixtures by Compact NMR Relaxometry

et al. 2021

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Metal–organic frameworks (MOFs) have great potential as an efficient alternative to current separation and purification procedures of a large variety of solvent mixtures—a critical process in many applications. Due to the huge number of existing MOFs, it is of key importance to identify high-throughput analytical tools, which can be used for their screening and performance ranking. In this context, the present work introduces a simple, fast, and inexpensive approach by compact low-field proton nuclear magnetic resonance (NMR) relaxometry to investigate the efficiency of MOF materials for the separation of a binary solvent mixture. The mass proportions of two solvents within a particular solvent mixture can be quantified before and after separation with the help of a priori established correlation curves relating the effective transverse relaxation times T2eff and the mass proportions of the two solvents. The new method is applied to test the separation efficiency of powdered UiO-66(Zr) for various solvent mixtures, including linear and cyclic alkanes and benzene derivate, under static conditions at room temperature. Its reliability is demonstrated by comparison with results from 1H liquid-state NMR spectroscopy.

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“…Gas adsorption to nanoporous materials and shales have has been previously studied [4,5]. These studies showed it was possible to identify three distributions of methane including 1) methane adsorbed in the micropores, 2) adsorbed methane in fast exchange with the surrounding mesopore network, and 3) adsorbed methane in exchange with the interparticle void space of the adsorbent beds by characteristic relaxation times and pressure dependencies in the relaxation time distributions.…”

Section: Introductionmentioning

confidence: 99%

Methane Isotherms and Magnetic Resonance Imaging in Shales

Dick¹,

Heagle

Veselinović³

et al. 2020

E3S Web Conf.

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Adsorption isotherms of light hydrocarbons on reservoir rocks are key data used to quantify the total gas content in reservoirs and isotherms are now being used to improve our understanding of the processes affecting subsurface gas flow associated with gas injection from Enhanced Oil Recovery techniques. This project combined elements of the traditional pressure-volume gas adsorption isotherm technique and an NMR-based adsorption isotherm approach to determine the adsorption isotherms of light hydrocarbons on to tight rocks from oil and gas reservoirs. The new approach allows isotherms to be derived from NMR data. First, a T2 distribution of the gas is determined over a range of gas pressures. Next, the volume of pore gas is estimated using the pore volume of the rock and the Van der Waals gas equation. The adsorbed gas content is then calculated by subtracting pore gas content from the total gas content. This is repeated for a range of gas pressures to determine the adsorption isotherm. This project used the NMR method described above and measured the gas pressure decay in the NMR cell. This combined approach includes the advantages of the NMR method but it also produces a pressure-time curve that can be used to identify when equilibrium is attained in low permeability rocks and can be used to compare adsorption kinetics of different gases. The advantages of our approach are that 1) the samples remain intact and the measurements provide information on the pore size distribution; 2) analyses can be carried out at reservoir pressures; 3) isotherms can be measured for any gas containing hydrogen atoms; and 4) the results can be used to examine the processes controlling gas flow through the rock. Future work to develop this technique will improve our quantification of the amount of pore gas in the cell, which will improve our partitioning between adsorbed gas and pore gas as well as allow for an improved analysis of the pressure response of the sample after degassing.

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High-pressure low-field 1H NMR relaxometry in nanoporous materials

Cited by 27 publications

References 41 publications

Microstructure and deformation mechanisms of a solid propellant using 1 H NMR spectroscopy

Microstructure and deformation mechanisms of a solid propellant using 1 H NMR spectroscopy

Screening Metal–Organic Frameworks for Separation of Binary Solvent Mixtures by Compact NMR Relaxometry

Methane Isotherms and Magnetic Resonance Imaging in Shales

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