Publication Date

6-14-2018

Department

Ames Laboratory; Chemistry

Campus Units

Chemistry, Ames Laboratory

Report Number

IS-J 9724

DOI

10.1016/j.chempr.2018.03.004

Journal Title

Chem

Volume Number

4

Issue Number

6

First Page

1387

Last Page

1403

Abstract

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 Pt3Sn intermetallic nanoparticles (iNPs) encapsulated within a protectective mesoporous silica shell (Pt3Sn@mSiO2). 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.

Language

en

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Available for download on Friday, June 14, 2019

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