Surface-Mediated Hyperpolarization of Liquid Water from Parahydrogen
| Autor: | Tao Ma, Raghu V. Maligal-Ganesh, Tian Wei Goh, Wenyu Huang, Evan Wenbo Zhao, Clifford R. Bowers, James H. P. Collins, Yong Du, Tommy Yunpu Zhao, Lin Zhou |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Spin polarization Proton General Chemical Engineering Biochemistry (medical) Nanoparticle 02 engineering and technology General Chemistry Mesoporous silica 010402 general chemistry 021001 nanoscience & nanotechnology Spin isomers of hydrogen Photochemistry 01 natural sciences Biochemistry 0104 chemical sciences Magnetization Materials Chemistry Environmental Chemistry Hyperpolarization (physics) Singlet state 0210 nano-technology |
| Zdroj: | Chem. 4:1387-1403 |
| ISSN: | 2451-9294 |
| Popis: | Summary 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. In this SWAMP (surface waters are magnetized by parahydrogen) effect, the spin polarization of the solvent protons is enhanced simply by the bubbling of parahydrogen through a suspension of Pt 3 Sn intermetallic nanoparticles (iNPs) encapsulated within a protectective mesoporous silica shell (Pt 3 Sn@mSiO 2 ). The conversion of singlet spin order into magnetization is mediated by symmetry-breaking interactions on the surface of the iNPs. Stimulated emission NMR signals of the exchangeable hydroxy protons are observed. Non-exchangeable methyl or methylene protons are also hyperpolarized, an observation that provides insight into the molecular mechanism. SWAMP has a myriad of potential applications, ranging from low-field MRI to drug discovery. |
| Databáze: | OpenAIRE |
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