Publications by authors named "Daniel P Watts"
This research uses perfluorocarbons (PFCs) as effective alternatives to traditional toxic solvents in reversible -hydrogen-induced polarization (PHIP) for NMR signal enhancement. Hydrogen solubility in PFCs is shown here to be an order of magnitude higher than in typical organic solvents by determination of Henry's constants. We demonstrate how this high H solubility enables the PFCs to deliver substantial polarization transfer from -hydrogen, achieving up to 2400-fold signal gains for H NMR detection and 67,000-fold (22% polarization) for N NMR detection at 9.
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- Researchers have provided the first precise experimental data on the quantum decoherence of entangled gamma rays produced from positron annihilation, focusing on triple Compton scattering.
- An entanglement witness (R) was established, showing enhanced azimuthal correlation in the scattering patterns, with measurements exceeding classical limits at certain angles (up to about 60°).
- These findings align with theoretical predictions and are significant for advancements in fundamental physics and potential applications in medical imaging techniques like positron emission tomography.
The neutral catalysts [IrCl(H)(NHC)(substrate)] or [IrCl(H)(NHC)(substrate)(sulfoxide)] are used to transfer polarization from hydrogen (H) to 3,5-dichloropyridine and 3,5-dibromopyridine substrates. This is achieved in a rapid, reversible, and low-cost process that relies on ligand exchange within the active catalyst. Notably, the sulfoxide-containing catalyst systems produced NMR signal enhancements between 1 and 2 orders of magnitude larger than its unmodified counterpart.
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