Low-field permanent magnets for industrial process and quality control

Mitchell, Jonathan; Gladden, Lynn F.; Chandrasekera, Thusara C.; Fordham, E.J.

doi:10.1016/j.pnmrs.2013.09.001

Cited by 244 publications

(159 citation statements)

References 519 publications

Supporting

Mentioning

155

Contrasting

Unclassified

Order By: Relevance

“…Time-domain nuclear magnetic resonance (TD-NMR) is a versatile analysis tool for determining the chemical and physical properties of a wide variety of materials with a constantly growing area of application, including laboratory and industrial analyses [14,15], although TD-NMR does not give the same level of detail of chemical structures as high-resolution NMR spectroscopy. However, TD-NMR has proven usable in industrial applications due to its mobility, low price, robustness, non-destructive analysis, and lack of sample preparation [11,15,16].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Molecular Properties of Fatty Acid Mixtures Estimated by Online Time-Domain NMR

Nikolskaya

Hiltunen

2018

Appl Magn Reson

View full text Add to dashboard Cite

An approach based on time-domain nuclear magnetic resonance (TD-NMR) enables the estimation of the molecular properties of fatty acid mixtures-kinematic viscosity (µ), heating value (δ), cetane number (CN), and carbon chain length (CL). In this approach, the 1 H NMR spin-spin relaxation rates R 2 or times T 2 were used to determine these molecular properties. Online monitoring of the µ, δ, CN, and CL of fatty acid mixtures was performed using an online TD-NMR system that had been modified for flowing samples. The presented results show the potential of TD-NMR for online quality control during the production of liquid fuels.

show abstract

Section: Introductionmentioning

confidence: 99%

“…However, TD-NMR has proven usable in industrial applications due to its mobility, low price, robustness, non-destructive analysis, and lack of sample preparation [11,15,16]. Furthermore, online process monitoring by NMR is also an increasingly used technique [11,12,17].…”

Section: Introductionmentioning

confidence: 99%

Molecular Properties of Fatty Acid Mixtures Estimated by Online Time-Domain NMR

Nikolskaya

Hiltunen

2018

Appl Magn Reson

View full text Add to dashboard Cite

show abstract

“…Interesting applications of portable single-sided NMR sensors to food matrices have been reported in literature [24,35]. Despite the inhomogeneous field generated by these open geometry sensors, their potentiality for food analysis and control has been explored.…”

Section: Application Of Single-sided Nmr Sensors To Food Matricesmentioning

confidence: 99%

“…At this aim, two methods [35] were applied. One is based on differences in relaxation times which depend on molecular mobility and, consequently on the molecular structure (relaxation weighted method), whereas the other one exploits the fact that the diffusion coefficients of water and fat differ by more than an order of magnitude (diffusionweighted method).…”

Section: Application Of Single-sided Nmr Sensors To Food Matricesmentioning

confidence: 99%

Portable NMR in food analysis

Capitani

Sobolev

Tullio

et al. 2017

Chem. Biol. Technol. Agric.

View full text Add to dashboard Cite

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.

show abstract

“…Because superconducting magnets can produce high and stable magnetic fields up to about 24 T [1], they are used for high-end NMR spectrometers and MRI systems. On the other hand, because permanent magnets need no liquid cryogen, they have been used in various applications including mobile and outdoor NMR and MRI systems [2][3][4][5]. However, permanent magnets have disadvantages in relation to the field strength (upper limit about 2 T [6]) and stability of the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Development of a superconducting bulk magnet for NMR and MRI

Nakamura

Tamada

Yanagi³

et al. 2015

Journal of Magnetic Resonance

107

View full text Add to dashboard Cite

A superconducting bulk magnet composed of six vertically stacked annular single-domain c-axis-oriented Eu-Ba-Cu-O crystals was energized to 4.74 T using a conventional superconducting magnet for high-resolution NMR spectroscopy. Shim coils, gradient coils, and radio frequency coils for high resolution NMR and MRI were installed in the 23 mm-diameter room-temperature bore of the bulk magnet. A 6.9 ppm peak-to-peak homogeneous region suitable for MRI was achieved in the central cylindrical region (6.2 mm diameter, 9.1 mm length) of the bulk magnet by using a single layer shim coil. A 21 Hz spectral resolution that can be used for high resolution NMR spectroscopy was obtained in the central cylindrical region (1.3 mm diameter, 4 mm length) of the bulk magnet by using a multichannel shim coil. A clear 3D MR image dataset of a chemically fixed mouse fetus with (50 μm)(3) voxel resolution was obtained in 5.5 h. We therefore concluded that the cryogen-free superconducting bulk magnet developed in this study is useful for high-resolution desktop NMR, MRI and mobile NMR device.

show abstract

Low-field permanent magnets for industrial process and quality control

Cited by 244 publications

References 519 publications

Molecular Properties of Fatty Acid Mixtures Estimated by Online Time-Domain NMR

Molecular Properties of Fatty Acid Mixtures Estimated by Online Time-Domain NMR

Portable NMR in food analysis

Development of a superconducting bulk magnet for NMR and MRI

Contact Info

Product

Resources

About