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Gels have been recently introduced in conservation to better control the cleaning action. The slow solvent release is of the utmost importance to selectively remove varnish layers of few microns thickness, applied on painting layers which may have similar chemical properties. To evaluate the interactions of the underlying painting with solvents, diagnostic methods should study …

Cleaning oil paintings: NMR relaxometry and SPME to evaluate the effects of green solvents and innovative green gels Read More »

Understanding the detection volume of a unilateral NMR sensor is crucial to interpret acquired data appropriately. Whereas this is easily done in the sensor’s axial dimension by running a depth profile on a well-defined sample, the lateral dimension is commonly characterized with very small samples, where each position along a regular grid is scanned individually, …

Visualizing the detection area of a unilateral NMR sensor using deconvolution and back-projection Read More »

Objective The study aim was to evaluate a small low-field NMR (nuclear magnetic resonance) scanner, the NMR-MOUSE®, for detecting changes in intestinal diffusion under different (patho-) physiological perfusion states. Methods Laparotomy was performed on 8 female landrace pigs (body weight 70±6 kg) and the feeding vessels of several intestinal loops were dissected. Successively, the intestinal …

Evaluation of the NMR-MOUSE as a new method for continuous functional monitoring of the small intestine during different perfusion states in a porcine model Read More »

Nowadays most low-field NMR sensors, such as the single-sided Profile NMR-MOUSE®, still suffer from poor sensitivity, either resulting from low magnetic field strengths and correspondingly low NMR frequencies, or lack of sensitivity. Generally, micro-coils can improve sensitivity, but due to their small size, and thus small inductance, they are mainly used for high-field NMR. Their main application field is parallel …

Miniaturized multi-coil arrays for functional planar imaging with a single-sided NMR sensor Read More »

As Magnetic Resonance Imaging devices are becoming more and more powerful, resolutions as small as 10 μm can now be obtained. But, this is only possible when systems with slow transverse relaxation rates, like living tissues, are investigated. In this case, the time available for gradients space-encoding is long, and high k values can be reached in the …

Micrometer scale resolution of materials by stray-field Magnetic Resonance Imaging Read More »

The single-sided NMR-MOUSE sensor that operates in highly inhomogeneous magnetic fields is used to record a CPMG 1H transverse relaxation decay by CPMG echo trains for a series of cross-linked natural rubber samples. Effective transverse relaxation rates 1/T2,short and 1/T2,long were determined by a bi-exponential fit. A linear dependence of transverse relaxation rates on cross-link density is observed for medium to large …

Distributions of transverse relaxation times for soft-solids measured in strongly inhomogeneous magnetic fields Read More »

Initiated by the use of NMR for well logging, portable NMR instruments are being developed for a variety of novel applications in materials testing and process analysis and control. Open sensors enable non‐destructive testing of large objects, and small, cup‐size magnets become available for high throughput analysis by NMR relaxation and spectroscopy. Some recent developments of mobile NMR are reviewed which delineate the direction into which portable NMR is moving. Blümich, F. Casanova, E. Danieli, Q. Gong, M. Greferath, A. Haber, …

Moving NMR Read More »