Hyperpolarization of Frozen Hydrocarbon Gases by Dynamic Nuclear Polarization at 1.2 K - Laboratoire de Chimie, Catalyse, Polymères et Procédés, UMR 5265
Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2016

Hyperpolarization of Frozen Hydrocarbon Gases by Dynamic Nuclear Polarization at 1.2 K

David Gajan
Sami Jannin

Résumé

We report a simple and general method for the hyperpolarization of condensed gases by dynamic nuclear polarization (DNP). The gases are adsorbed in the pores of structured mesoporous silica matrices known as HYPSOs (HYper Polarizing SOlids) that have paramagnetic polarizing agents covalently bound to the surface of the mesopores. DNP is performed at low temperatures and moderate magnetic fields (T = 1.2 K and B0 = 6.7 T). Frequency-modulated microwave irradiation is applied close to the electron spin resonance frequency (f = 188.3 GHz), and the electron spin polarization of the polarizing agents of HYPSO is transferred to the nuclear spins of the frozen gas. A proton polarization as high as P(1H) = 70% can be obtained, which can be subsequently transferred to 13C in natural abundance by cross-polarization, yielding up to P(13C) = 27% for ethylene.

Domaines

Chimie
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Dates et versions

hal-01498671 , version 1 (04-09-2024)

Identifiants

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Basile Vuichoud, Estel Canet, Jonas Milani, Aurélien Bornet, David Baudouin, et al.. Hyperpolarization of Frozen Hydrocarbon Gases by Dynamic Nuclear Polarization at 1.2 K. Journal of Physical Chemistry Letters, 2016, 7 (16), pp.3235 - 3239. ⟨10.1021/acs.jpclett.6b01345⟩. ⟨hal-01498671⟩
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