A mobile one-sided NMR sensor with a homogeneous magnetic field: The NMR-MOLE

Manz, B.; Coy, Andrew; Dykstra, Robin; Eccles, C.D.; Hunter, Mark; Parkinson, Ben; Callaghan, Paul T.

doi:10.1016/j.jmr.2006.07.017

Cited by 101 publications

(64 citation statements)

References 15 publications

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“…As an example, consider portable NMR devices (Eidmann et al, 1996;Prado, 2003;Blümich et al, 2002;Manz et al, 2006;Marble et al, 2006;Marko et al, 2007;McDonald et al, 2007) which opened up the possibility to examine samples on the spot, be it in the field or in archives. While these devices are currently far from capable of producing images comparable to those presented here, the characteristic relaxation parameters or spectral fingerprints they already can measure could become a valuable non-invasive categorisation tool when screening rock samples for embedded fossils.…”

Section: Perspectives For Fossil Mrimentioning

confidence: 99%

Three-dimensional Magnetic Resonance Imaging of fossils across taxa

Mietchen

Aberhan²,

Manz

et al. 2008

Biogeosciences

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Abstract. The frequency of life forms in the fossil record is largely determined by the extent to which they were mineralised at the time of their death. In addition to mineral structures, many fossils nonetheless contain detectable amounts of residual water or organic molecules, the analysis of which has become an integral part of current palaeontological research. The methods available for this sort of investigations, though, typically require dissolution or ionisation of the fossil sample or parts thereof, which is an issue with rare taxa and outstanding materials like pathological or type specimens. In such cases, non-destructive techniques could provide a valuable methodological alternative. While Computed Tomography has long been used to study palaeontological specimens, a number of complementary approaches have recently gained ground. These include Magnetic Resonance Imaging (MRI) which had previously been employed to obtain three-dimensional images of pathological belemnites non-invasively on the basis of intrinsic contrast. The present study was undertaken to investigate whether 1 H MRI can likewise provide anatomical information about nonpathological belemnites and specimens of other fossil taxa. To this end, three-dimensional MR image series were acquired from intact non-pathological invertebrate, vertebrate and plant fossils. At routine voxel resolutions in the range of several dozens to some hundreds of micrometers, these images reveal a host of anatomical details and thus highlight the potential of MR techniques to effectively complement existing methodological approaches for palaeontological investigations in a wide range of taxa. As for the origin of the MR signal, relaxation and diffusion measurements as well as 1 H and 13 C MR spectra acquired from a belemnite suggest intracrystalline water or hydroxyl groups, rather than organic residues.

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Section: Perspectives For Fossil Mrimentioning

confidence: 99%

Three-dimensional Magnetic Resonance Imaging of fossils across taxa

Mietchen

Aberhan²,

Manz

et al. 2008

Biogeosciences

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“…While this facilitates high signal-to-noise, geometrically correct, spatially resolved magnetic resonance imaging (MRI), it limits the range of samples that can be examined. In recent years, this limitation has been addressed by development of portable or unilateral NMR [22][23][24]. The geometry of portable NMR sensors, in which the object is exposed to the stray field of the magnet, is referred to as open geometry.…”

Section: Portable Single-sided Nmr Sensors With Open Geometrymentioning

confidence: 99%

“…Sensors based on permanent magnets have been developed during the last years covering applications involving relaxometry, imaging and even spectroscopy with hand-held systems [20][21][22][23]. These devices require low maintenance costs and allow easy sample access, which makes them attractive for quality and process control in industrial environments.…”

Section: Introductionmentioning

confidence: 99%

Portable NMR in food analysis

Capitani

Sobolev

Tullio

et al. 2017

Chem. Biol. Technol. Agric.

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Low-field 1 H NMR relaxometry is an important tool used to investigate on the most abundant components of intact foodstuffs based on relaxation parameters and amplitude of the NMR signals. In particular, information on water compartments, diffusion and movement can be obtained by detecting proton signals prevalently ascribable to H 2 O contained in foodstuffs. The main advantage of this technique is that it does not require any pretreatment of the sample and once developed, standard protocols based on rapid measurements can be easily transferred to quality control applications. An actual breakthrough for the low-field NMR application to food science has certainly been the development of unilateral NMR sensors. These devices present an attractive option for non-invasive assessment of compositional and microstructure of food materials. They are portable and allow easy sample access, which makes them attractive for quality control in industrial environments and directly on sealed packaged foods. A price to pay is the inhomogeneity of the magnetic field, which compromises the sensitivity of these devices. However, recent developments in unilateral magnets design offer larger sensitive volume, higher sensitivity and shorter dead times. In this brief review, we highlight the different uses of unilateral NMR devices in food analysis.

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“…There are several designs [15][16][17] of relatively inexpensive NMR instrument that use permanent magnets to provide a strong polarising field and on which a sample may be placed for unilateral (one-sided) NMR imaging. In our profile NMR MOUSE ® a strong (11.4 T/m) magnetic field gradient resides across the selected slice.…”

Section: Nmr Instrumentmentioning

confidence: 99%

Quantitative NMR monitoring of liquid ingress into repellent heterogeneous layered fabrics

Bencsik¹,

Adriaensen²,

Brewer³

et al. 2008

Journal of Magnetic Resonance

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Fabrics which are water repellent and repellent to other liquids are often constructed using multiple layers of material. Such a construction is preferable to a single layer of a liquid repellent textile because, under the action of an applied pressure, ingress of a liquid through the first layer can be halted by the second or subsequent layers. In the quantitative investigation of this problem, current techniques provide limited information on the progress and distribution of the liquid as it ingresses into a fabric. Moreover, many techniques require that the material is delaminated prior to analysis, and cannot be conducted in real time to measure the progress of a liquid through the textile substrate. In this work we demonstrate that unilateral NMR, which allows signal to be collected from a volume of interest in a material residing above the instrument, can be a powerful tool to quantitatively monitor the ingress of a liquid through a layered sample exhibiting pronounced heterogeneities in repellency. A known volume of oil was placed on the top of a model textile sample composed of three 80 µm thick layers. Spatially resolved one dimensional vertical NMR profiles of the system were acquired as a function of the pressure vertically applied to the top of the sample. These profiles show that the absolute liquid volume present in each layer of textile can routinely be measured within 4 minutes with a spatial resolution of 15 µm. If each individual layer exhibits different repellency to the test liquid, the complexity of the dynamics of the ingress can be investigated in great detail. An elegant application of the unilateral instrument was obtained in which the sensitive volume matched the region of interest of the individual layers of the textile under investigation.

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A mobile one-sided NMR sensor with a homogeneous magnetic field: The NMR-MOLE

Cited by 101 publications

References 15 publications

Three-dimensional Magnetic Resonance Imaging of fossils across taxa

Three-dimensional Magnetic Resonance Imaging of fossils across taxa

Portable NMR in food analysis

Quantitative NMR monitoring of liquid ingress into repellent heterogeneous layered fabrics

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