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Interplay of ethaline and water dynamics in a hydrated eutectic solvent: Deuteron and oxygen magnetic resonance studies of aqueous ethaline.
J Chem Phys
December 2024
Fakultät Physik, Technische Universität Dortmund, D-44221 Dortmund, Germany.
For many technological processes, the impact of water addition on the properties of deep eutectic solvents is of central importance. In this context, the impact of hydration on the reorientational dynamics of the deep eutectic solvent (DES) ethaline, a 2:1 molar mixture of ethylene glycol and choline chloride, was studied. Its overall response was explored by means of shear mechanical rheology.
View Article and Find Full Text PDFFirst in-human evaluation of [1-C]pyruvate in DO for hyperpolarized MRI of the brain: A safety and feasibility study.
Magn Reson Med
June 2024
Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York, USA.
Purpose: To investigate the safety and value of hyperpolarized (HP) MRI of [1-C]pyruvate in healthy volunteers using deuterium oxide (DO) as a solvent.
Methods: Healthy volunteers (n = 5), were injected with HP [1-C]pyruvate dissolved in DO and imaged with a metabolite-specific 3D dual-echo dynamic EPI sequence at 3T at one site (Site 1). Volunteers were monitored following the procedure to assess safety.
2H and 13C nuclear spin relaxation unravels dynamic heterogeneities in deep eutectic solvents of ethylene glycol, glycerol, or urea with choline chloride.
J Chem Phys
December 2023
Fakultät Physik, Technische Universität Dortmund, D-44221 Dortmund, Germany.
Using deuteron spin-lattice and spin-spin relaxometry, the reorientational dynamics of ethaline (choline chloride/ethylene glycol) and reline (choline chloride/urea) are studied in a component-selective, isotope-edited manner over a wide temperature range, thereby complementing previous work on glyceline (choline chloride/glycerol). Differences in the hydrogen bond propensities effectuate that in reline and glyceline, the choline ions move faster than the hydrogen bond donors, glycerol and urea; in ethaline, the ethylene glycol molecules are reorienting faster. For glyceline and reline, the increase in the corresponding time scale ratio indicates a pronounced strengthening of the glycerol and urea networks upon cooling, while in ethaline, the time scale ratio remains essentially constant.
View Article and Find Full Text PDFNuclear Magnetic Resonance Studies of Bicontinuous Liquid Crystalline Phases of Cubic Symmetry: Transport Properties from H Nuclear Magnetic Resonance Relaxation Rates.
Langmuir
July 2023
Division of Physical Chemistry, Lund University, P. O. Box 124, SE-22100 Lund, Sweden.
The ternary system didodecyltrimethylammonium bromide, 1-decanol, and water forms an extended reversed continuous phase of cubic symmetry at 25 °C. The cubic phase belongs to the space group 3, as shown by small-angle X-ray experiments. We present extensive deuterium NMR relaxation data from this cubic phase for 1-decanol, deuterated at the carbon adjacent to the hydroxyl carbon position.
View Article and Find Full Text PDFMagnetic functionalization of ZnO nanoparticles surfaces via optically generated methyl radicals.
J Chem Phys
May 2023
Aix Marseille University, CNRS, IM2NP, Marseille, France.
The combination of nuclear and electron magnetic resonance techniques, in pulse and continuous wave regimes, is used to unravel the nature and features of the light-induced magnetic state arising at the surface of chemically prepared zinc oxide nanoparticles (NPs) occurring under 120 K when subjected to a sub-bandgap (405 nm) laser excitation. It is shown that the four-line structure observed around g ∼ 2.00 in the as-grown samples (beside the usual core-defect signal at g ∼ 1.
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