Magnetic resonance diffusion and relaxation characterization of water in the unfrozen vein network in polycrystalline ice and its response to microbial metabolic products

Brown, Jennifer R.; Brox, Timothy I.; Vogt, Sarah J.; Seymour, Joseph D.; Skidmore, M. L.; Codd, Sarah L.

doi:10.1016/j.jmr.2012.09.011

Cited by 15 publications

(12 citation statements)

References 62 publications

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“…3 and measured T 2 values to calculate ρ via the relationship 1/ T 2 ∼ ρS / V p . This is possible, despite the inherent relaxation weighting in PGSE NMR measurements of diffusion that is not present in T 2 relaxation measurements [35], due to the low susceptibility between solid ice and liquid water [18]. Further, the value of ρ was found at both short and long aging times (Fig.…”

Section: Resultsmentioning

confidence: 98%

“…have shown the utility of NMR to monitor the composition of the unfrozen water phase during the formation of cryogels in situ [15], [16]. We utilize NMR magnetic relaxation time and molecular diffusion measurements, which are proven robust in probing pore structure in porous media [17] and sensitive to vein dimensions [18], to provide a novel method for monitoring ice structure and its evolution with time. This provides a new analytical method for quantitative characterization of ice structure during biotechnological freezing processes.…”

Section: Introductionmentioning

confidence: 99%

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Recrystallization inhibition in ice due to ice binding protein activity detected by nuclear magnetic resonance

Brown

Seymour

Brox

et al. 2014

Biotechnology Reports

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HighlightsMR techniques can quantitatively characterize ice liquid vein network structure.MR techniques can non-invasively monitor ice recrystallization processes with time.Bacterial ice binding protein results in persistent small ice crystal structure.MR is a new method to quantify ice structure during biotechnological processes.Results demonstrate potential of MR in biotechnology process monitoring.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Recrystallization inhibition in ice due to ice binding protein activity detected by nuclear magnetic resonance

Brown

Seymour

Brox

et al. 2014

Biotechnology Reports

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“…[55,56] The fitting of the self-diffusion data to the normalized ratios D app (Δ)/D 0 was performed using a Python nonlinear leastsquares fitting routine for the two-point Padé approximation [Eqn (7)]. [46] To compare the surface to volume ratios determined with NMR diffusion experiments, the specific surface of the porous media was also measured with krypton BET. [57]…”

Section: Methodsmentioning

confidence: 99%

“…However, this turns out to be difficult in practice for samples with a broad range of pore sizes. From the short-time and the long-time limits, it is possible to extrapolate to the real relationship using a two-point Padé approximation [46,47]…”

Section: Nmr Relaxation Measurements In Unconsolidated Sedimentsmentioning

confidence: 99%

Effect of magnetic pore surface coating on the NMR relaxation and diffusion signal in quartz sand

Duschl

Pohlmeier

Brox

et al. 2016

Magnetic Reson in Chemistry

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Magnetic impurities are ubiquitous in natural porous media such as sand and soil. They generate internal magnetic field gradients because of increased magnetic susceptibility differences between solid and liquid phase in the pore space and because of the presence of magnetic centers. These internal gradients accelerate NMR relaxation rates and thus might limit the possibility of pore space characterization using NMR. In this study, we investigate the effects of coating the surface of natural sands by the antiferromagnetic iron oxyhydroxide goethite on NMR relaxation and diffusion properties. We found a non-quadratic dependence of the relaxation time distributions on the echo time indicating that the relaxation experiments were not performed in the fast diffusion limit, while the weak dependence on the external magnetic field strength is explained by the preponderance of the surface relaxation over the effect of diffusion in internal gradients. The surface to volume ratio of the pore space, determined by NMR diffusimetry ((S/V) ) remains approximately constant, whereas the same quantity, determined from gas adsorption ((S/V) ) increases proportional to the coating density. This is because gas adsorption measures surface roughness on sub-nanometer scale, whereas NMR diffusimetry averages over structures smaller than few microns. This has consequences for the calculation of the surface relaxivities. The usage of the (S/V) leads to constant values, whereas the usage of (S/V) leads to apparently decreasing relaxivities with increasing coating, which is unrealistic. Copyright © 2016 John Wiley & Sons, Ltd.

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“…The capacity of atomic nuclei to absorb and transmit electromagnetic energy of a specific frequency, which is different for different nuclei, renders this phenomenon selectively sensitive to different types of material. NMR is reported to be an efficient tool for investigating water in ice and permafrost samples (Callaghan et al 1999;Brown et al 2012;Brox et al 2015). The magnetic resonance sounding (MRS) method is a geophysical application of the NMR phenomenon employing hydrogen nuclei (H 1 ) in water molecules.…”

Section: Magnetic Resonance Soundingmentioning

confidence: 99%

Investigating a firn aquifer near Helheim Glacier (South‐Eastern Greenland) with magnetic resonance soundings and ground‐penetrating radar

Legchenko

Miège

Koenig

et al. 2018

Near Surface Geophysics

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We apply the magnetic resonance sounding (MRS) method to investigate a firn aquifer in the south‐east region of the Greenland ice sheet. Our study aims to delineate and estimate the volume of the recently discovered water stored within the firn (compacted snow) that remains liquid throughout the year. We develop and test successfully a methodology for joint use of MRS and ground‐penetrating radar (GPR). This non‐invasive geophysical approach is particularly well‐adapted to glacier conditions and has a promising future for in situ investigation of water distribution in glaciers. At our field site, MRS showed an aquifer located at variable depths between 20 and 30 m beneath the ice‐sheet surface. At the monitoring site, both MRS and GPR show an increase in the water volume stored between April 2015 and July 2016. MRS estimates suggest that the volume increased by approximately 28%.

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Magnetic resonance diffusion and relaxation characterization of water in the unfrozen vein network in polycrystalline ice and its response to microbial metabolic products

Cited by 15 publications

References 62 publications

Recrystallization inhibition in ice due to ice binding protein activity detected by nuclear magnetic resonance

Recrystallization inhibition in ice due to ice binding protein activity detected by nuclear magnetic resonance

Effect of magnetic pore surface coating on the NMR relaxation and diffusion signal in quartz sand

Investigating a firn aquifer near Helheim Glacier (South‐Eastern Greenland) with magnetic resonance soundings and ground‐penetrating radar

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