Low-field single-sided NMR for one-shot 1D-mapping: Application to membranes

Judeinstein, Patrick; Ferdeghini, Filippo; Oliveira‐Silva, Rodrigo de; Zanotti, Jean-Marc; Sakellariou, Dimitrios

doi:10.1016/j.jmr.2017.02.003

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…Many single sided NMR systems have been proposed in the literature [13]. Our approach to magnet design is based on the Spherical Harmonic Decomposition methodology to lead to a 12-fold cylindrically symmetric one-sided constant-gradient magnet without pole pieces [14,15], which has been used already to measure onedimensional proton density profiles as well as relaxations and diffusions [16,17]. Our permanent magnet is a cylinder of 24 cm in diameter, 22 cm in height containing NdFeB magnets and weights ∼ 40 kg.…”

Section: A Home-made Portable Single-sided Nmr Setupmentioning

confidence: 99%

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Coupling NMR to SANS: Addressing at once structure and dynamics in soft matter

Oliveira‐Silva

Bélime

Cœur

et al. 2020

JNR

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In soft condensed matter, Small Angle Neutron Scattering (SANS) is a central tool to probe structures with characteristic sizes ranging from 1 to 100 nm. However, when used as a standalone technique, the dynamic properties of the sample are not accessible. Nuclear Magnetic Resonance (NMR) is a versatile technique which can easily probe dynamical information. Here, we report on the coupling of a low-field NMR system to a SANS instrument. We show that this original setup makes it possible to obtain structural information and to simultaneously extract in situ on a same sample, long-range translational diffusion coefficient, T 1 and T 2 nuclear spin relaxation times. Such a feature is of major interest when a sample experiences a transient physical state or evolves rapidly. We illustrate the capabilities of alliancing these experimental methods by following the critical temperature-induced phase separation of a concentrated Poly(Methacrylic Acid) solution at its Lower Critical Solution Temperature. The characteristic size related to the domain growth of the polymer-rich phase of the gel is monitored by the evolution of the SANS spectra, while the dynamics of the sol phase (H 2 O and polymer) is simultaneously characterized by NMR by measuring T 1 , T 2 and the diffusion coefficient. Great care has been taken to design a cell able to optimize the thermalization of the sample and in particular its equilibration time. Details are given on the sample cell specifically designed and manufactured for these experiments. The acquisition time needed to reach good signal-to-noise ratios, for both NMR and SANS, match: it is of the order of one hour. Altogether, we show that in situ low-field NMR/SANS coupling the NMR is meaningful and is a promising experimental approach.

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Section: A Home-made Portable Single-sided Nmr Setupmentioning

confidence: 99%

“…This device produces a magnetic field strength of ∼0.3 T at 2 cm far from its upper surface which has a linear magnetic field gradient g = 3.43 T/m [17]. A photo of the magnet as well as a field mapping above its surface can be seen on Fig.…”

Section: A Home-made Portable Single-sided Nmr Setupmentioning

confidence: 99%

Coupling NMR to SANS: Addressing at once structure and dynamics in soft matter

Oliveira‐Silva

Bélime

Cœur

et al. 2020

JNR

Self Cite

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“…The aim is often a cost‐efficient online monitoring of processes. [ 7–13 ] Factors that are not easily accessible by conventional analytical tools are often addressed and investigated. A static magnetic field gradient is prominent in most of these sensors.…”

Section: Introductionmentioning

confidence: 99%

Dedicated NMR sensor to analyze relaxation and diffusion in liquids and its application to characterize lubricants

Rudszuck¹,

Zick

Gross

et al. 2021

Magnetic Reson in Chemistry

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A dedicated nuclear magnetic resonance (NMR) sensor was designed for the analysis of liquids. The magnets are arranged in a V shape, creating a spatially dependent magnetic field in the gap. Measurements of samples with diverse diameters are possible underdefined magnetic field gradients at a given position. The magnet thus combines properties of single sided NMR with high static magnetic field gradients and classical time domain (TD) devices with lower to almost zero gradients. The sensor can easily be adapted to the requirements of the considered investigation; probes can be customized. On the example of lubricants and their aging, the added value and applicability of this sensor in quality control are highlighted in this publication. Relaxation and diffusion were measured by Carr–Purcell–Meiboom–Gill (CPMG) while varying the echo time τe and quantified via numerical modeling. Especially, relaxation shows a high sensitivity towards aging of lubricants such as particulate abrasion and changes in molecular dynamics induced, for example, by additive depletion. The applicability of this NMR sensor in quality control is demonstrated on the example of engine and transmission oils as well as of lubrication greases.

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“…Recent studies have investigated the feasibility of low-field systems for imaging organs including the brain, lungs, heart, and musculoskeletal [19][20][21][22]. Additionally, custom-built magnet systems and detectors were widely used in nuclear magnetic resonance (NMR) systems for producing uniform magnetic fields in medical, biological and chemical analysis applications [23][24][25][26][27]. While these systems generate relatively uniform magnetic fields in small volumes between 100-200mm, they are not capable of relatively larger volumes.…”

Section: Introductionmentioning

confidence: 99%