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Differentiation of fentanyl analogues by low-field NMR spectroscopy
Analytica Chimica Acta, 2019Forensic laboratories commonly receive new psychoactive substances such as fentanyl analogues and other synthetic opioids that are difficult to identify. Slight changes to chemical structures, e.g. shifting the position of functional groups such as methyl groups or halogens on the aromatic ring, may not be distinguished using traditional methods.
Jonathan Duffy +4 more
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Development of Low-Field Pulsed NMR Instrument Probe
2021 IEEE 4th International Conference on Electronics Technology (ICET), 2021The probe is the most important and sensitive part of the low-field pulse nuclear magnetic resonance (NMR) instrument. Compared with probes of other shapes, the solenoid probes have the advantages of high Q (quality factor) value and good magnetic field uniformity.
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Optical Atomic Magnetometry for Ultra-Low-Field NMR Detection
2013Abstract This chapter deals with detection of nuclear magnetic resonance (NMR) signals in the ultra-low-field (ULF) regime, by means of optical atomic magnetometers (OAMs). A general introduction is provided about specific NMR features occurring when nuclei precess in microtesla fields, or weaker.
BEVILACQUA, GIUSEPPE +3 more
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Hyphenated low‐field NMR techniques: combining NMR with NIR, GPC/SEC and rheometry
Magnetic Resonance in Chemistry, 2015Hyphenated low‐field NMR techniques are promising characterization methods for online process analytics and comprehensive offline studies of soft materials. By combining different analytical methods with low‐field NMR, information on chemical and physical properties can be correlated with molecular dynamics and complementary chemical information.
Räntzsch, Volker +2 more
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Oil-Viscosity Predictions From Low-Field NMR Measurements
SPE Reservoir Evaluation & Engineering, 2005Summary Canada contains vast reserves of heavy oil and bitumen. Viscosity determination is key to the successful recovery of this oil, and low-field nuclear magnetic resonance (NMR) shows great potential as a tool for estimating this property. An NMR viscosity correlation previously had been developed that is valid for order-of-magnitude
J. Bryan, A. Kantzas, C. Bellehumeur
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Evaluation of Composites Miscibility by Low Field NMR
International Journal of Polymeric Materials, 2007Solid state nuclear magnetic resonance (NMR) is a powerful technique to analyze polymer composites. The use of proton relaxation data to evaluate the dispersity of the dispersion phase in the composite and its homogeneity are very wide. In this work PVC/silica composites were prepared using different ratios to obtain a new material to be used in ...
Maria Inês B. Tavares +5 more
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Analysis of freeze-thaw damage and pore structure deterioration of mortar by low-field NMR
Construction and Building Materials, 2022Yaozeng Wang +4 more
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