Results 201 to 210 of about 2,750 (239)

Mesoporous Silica Encapsulated Platinum-Tin Intermetallic Nanoparticles Catalyze Hydrogenation with an Unprecedented 20% Pairwise Selectivity for Parahydrogen Enhanced Nuclear Magnetic Resonance.

Journal of Physical Chemistry Letters, 2022
Supported noble metals offer key advantages over homogeneous catalysts for in vivo applications of parahydrogen-based hyperpolarization. However, their performance is compromised by randomization of parahydrogen spin order resulting from rapid hydrogen ...
Yong Du, R. Behera, Raghu V. Maligal-Ganesh, Minda Chen, T. Y. Zhao, Wenyu Huang, C. Bowers   +6 more
semanticscholar   +1 more source

The microscopic dynamics of condensed parahydrogen

Applied Physics A: Materials Science & Processing, 2002
We have measured the almost-pure incoherent scattering function of liquid and solid parahydrogen, using inelastic neutron scattering. The experiments were carried out on TOSCA, a time-of-flight, inverse-geometry, crystalanalyzer spectrometer, operating on the pulsed neutron source at ISIS (UK).
Celli M., Colognesi D., Zoppi M.
openaire   +3 more sources

Radiofrequency encoded Only Parahydrogen SpectroscopY

Journal of Magnetic Resonance, 2021
A new pulse sequence aimed to filter out NMR signals coming from thermally polarized protons in PHIP experiments based on the OPSY pulse sequence (Only Parahydrogen SpectroscopY) is presented. In analogy to OPSY, which removes thermal polarization by using a pair of magnetic field gradient pulses with an intensity ratio 1:2 and equal duration, the same
S, Bussandri, R H, Acosta, L, Buljubasich   +2 more
openaire   +2 more sources

Scanning Nuclear Spin Level Anticrossings by Constant-Adiabaticity Magnetic Field Sweeping of Parahydrogen-Induced 13C Polarization.

Journal of Physical Chemistry Letters, 2022
The polarization transfer between 1H protons and 13C heteronuclei is of central importance in the development of parahydrogen-based hyperpolarization techniques dedicated to the production of 13C-hyperpolarized molecular probes.
B. Joalland, E. Chekmenev
semanticscholar   +1 more source

65% Parahydrogen from a liquid nitrogen cooled generator.

Journal of magnetic resonance (San Diego, Calif. 1997 : Print), 2022
The isomeric enrichment of parahydrogen (pH2) gas is readily accomplished by lowering the gas temperature in the presence of a catalyst. This enrichment is often pursued at two distinct temperatures: ∼51% pH2 is generated at liquid nitrogen temperatures (
Yash Mhaske, Elodie Sutter, James Daley, C. Mahoney, Nicholas Whiting   +4 more
semanticscholar   +1 more source

Mechanisms of Methylenecyclobutane Hydrogenation over Supported Metal Catalysts Studied by Parahydrogen-Induced Polarization Technique.

ChemPhysChem, 2022
In this work the mechanism of methylenecyclobutane hydrogenation over titania-supported Rh, Pt and Pd catalysts was investigated using parahydrogen-induced polarization (PHIP) technique.
O. G. Salnikov, D. B. Burueva, L. Kovtunova, V. Bukhtiyarov, K. Kovtunov, I. Koptyug   +5 more
semanticscholar   +1 more source

Developing Analytical Applications for Parahydrogen Hyperpolarization: Urinary Elimination Pharmacokinetics of Nicotine.

Analytical Chemistry, 2021
Nuclear magnetic resonance spectroscopy (NMR) is a valuable analytical tool with applications in a vast array of research fields from chemistry and biology to medicine and beyond.
Nele Reimets, Kerti Ausmees, S. Vija, I. Reile   +3 more
semanticscholar   +1 more source

Toward Continuous-Flow Hyperpolarisation of Metabolites via Heterogenous Catalysis, Side-Arm-Hydrogenation, and Membrane Dissolution of Parahydrogen.

ChemPhysChem, 2021
Side-arm hydrogenation (SAH) by homogeneous catalysis has extended the reach of the parahydrogen enhanced NMR technique to key metabolites such as pyruvate.
William G. Hale, T. Y. Zhao, Diana Choi, M. Ferrer, Bochuan Song, Hanqin Zhao, Helena Hagelin-Weaver, C. Bowers   +7 more
semanticscholar   +1 more source

Surface-Mediated Hyperpolarization of Liquid Water from Parahydrogen

CheM, 2018
This article reports the discovery of surface-mediated parahydrogen-induced alignment of the proton magnetic moments in liquid water as well as methanol and ethanol.
Evan Wenbo Zhao, Yong Du, Tommy Yunpu Zhao   +2 more
exaly   +2 more sources

Anchored complexes of rhodium and iridium in the hydrogenation of alkynes and olefins with parahydrogen

Catalysis Science & Technology, 2022
Several catalysts synthesized by covalently binding Rh and Ir complexes to NH2- and PPh2- functional groups of the linker chains on functionalized silica gel surface were compared in gas-phase hydrogenation...
I. V. Skovpin, L. Kovtunova, A. Nartova, R. Kvon, V. Bukhtiyarov, I. Koptyug   +5 more
semanticscholar   +1 more source