Events:
Phosphoramidite compound identification and impurity...
ACS Spring 2023 – March...
Pittcon 2023 – We can’t...
News:
Structure Verification of...
Molecular weight determination...
Optimizing a two-step...

extern

NMR water self-diffusion and relaxation studies on sodium polyacrylate solutions and gels in physiologic ionic solutions

Water self‐diffusion coefficients and longitudinal relaxation rates in sodium polyacrylate solutions and gels were measured by NMR, as a function of polymer content and structure in a physiological concentration range of monovalent and divalent cations, Ca2+ and Na+. Several physical models describing the self‐diffusion of the solvent were applied and compared. A free‐volume model was found …

NMR water self-diffusion and relaxation studies on sodium polyacrylate solutions and gels in physiologic ionic solutions Read More »

Nuclear magnetic resonance profiling of chemical warfare agent simulant mass-transport through a multilayered polymeric coating

Temporary peelable coatings (TPCs) protect military equipment surfaces against chemical warfare agents (CWAs) by absorbing liquid contamination, thereby reducing the contact and vapor hazards to personnel. An understanding of the liquid CWA mass-transport mechanisms governing sorption is critical toward optimizing coating properties for reducing these hazards. We applied Nuclear Magnetic Resonance profiling to resolve mass-transport …

Nuclear magnetic resonance profiling of chemical warfare agent simulant mass-transport through a multilayered polymeric coating Read More »

Investigation of deformation mechanisms during latex film formation by combination of unilateral NMR and near infrared measurements

Unilateral solid state NMR and near infrared measurements are combined to study latex film formation at different temperatures and humidities in order to cover a broad parameter-space of film formation conditions. From analysis of nuclear magnetic resonance (NMR) data the time evolution of water and polymer fraction at different (vertical) positions in the film were estimated. The …

Investigation of deformation mechanisms during latex film formation by combination of unilateral NMR and near infrared measurements Read More »

NMR detection of thermal damage in carbon fiber reinforced epoxy resins

Composite materials of epoxy resins reinforced by carbon fibers are increasingly being used in the construction of aircraft. In these applications, the material may be thermally damaged and weakened by jet blast and accidental fires. The feasibility of using proton NMR relaxation times T1, T1ρ, and T2 to detect and quantify the thermal damage is investigated. In conventional spectrometers with homogeneous static magnetic fields, T1ρ is readily measured and is found to be …

NMR detection of thermal damage in carbon fiber reinforced epoxy resins Read More »

Sequence for simultaneous measurement of long-limit diffusion and longitudinal relaxation in unilateral NMR

When unilateral NMR is employed with large gradients (20 T/m), measurements of T1 using standard sequences become affected by Brownian motion of spins, particularly in samples with long spin-lattice relaxation times T1 (>2000 ms) and a large diffusion coefficient D (2*10−6 mm2/ms). In light of this, a modified saturation sequence which we have called GAUSS-SR is proposed that allows direct measurement of both D and T1 to be …

Sequence for simultaneous measurement of long-limit diffusion and longitudinal relaxation in unilateral NMR Read More »

Probing molecular dynamics with hyperpolarized ultrafast Laplace NMR using a low-field, single-sided magnet

Laplace NMR (LNMR) offers deep insights on diffusional and rotational motion of molecules. The so-called “ultrafast” approach, based on spatial data encoding, enables one to carry out a multidimensional LNMR experiment in a single scan, providing from 10 to 1000-fold acceleration of the experiment. Here, we demonstrate the feasibility of ultrafast diffusion–T2 relaxation correlation (D–T2) measurements …

Probing molecular dynamics with hyperpolarized ultrafast Laplace NMR using a low-field, single-sided magnet Read More »

Hydraulic characterisation of iron-oxide-coated sand and gravel based on nuclear magnetic resonance relaxation mode analyses

The capability of nuclear magnetic resonance (NMR) relaxometry to characterise hydraulic properties of iron-oxide-coated sand and gravel was evaluated in a laboratory study. Past studies have shown that the presence of paramagnetic iron oxides and large pores in coarse sand and gravel disturbs the otherwise linear relationship between relaxation time and pore size. Consequently, the …

Hydraulic characterisation of iron-oxide-coated sand and gravel based on nuclear magnetic resonance relaxation mode analyses Read More »

Measuring diffusion–relaxation correlation maps using non-uniform field gradients of single-sided NMR devices

Single-sided NMR systems are becoming a relevant tool in industry and laboratory environments due to their low cost, low maintenance and capacity to evaluate quantity and quality of hydrogen based materials. The performance of such devices has improved significantly over the last decade, providing increased field homogeneity, field strength and even controlled static field gradients. For …

Measuring diffusion–relaxation correlation maps using non-uniform field gradients of single-sided NMR devices Read More »

An estimation method of MR signal parameters for improved image reconstruction in unilateral scanner.

Unilateral NMR devices are a valuable tool in various applications such as non-destructive testing or well logging, but are not applied routinely for biomedical imaging. A low cost, unilateral and portable MRI can introduce MRI into clinical applications previously non-feasible, exploiting the advantages of the open architecture, the portability and affordable costs of these scanners. …

An estimation method of MR signal parameters for improved image reconstruction in unilateral scanner. Read More »

Quick finder

About us

Applications

Resources