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 (Pt₃[email protected]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.

本文报道了液态水以及甲醇和乙醇中质子磁矩的表面介导的对氢诱导排列的发现。在该SWAMP（地表水被对位氢磁化）效应中，通过包裹在保护性介孔二氧化硅壳（Pt ₃）中的Pt ₃ Sn金属间纳米颗粒（iNPs）悬浮液使对位氢鼓泡，可以增强溶剂质子的自旋极化。[电子邮件保护] ₂）。单峰自旋自旋向磁化的转化是通过iNP表面上的对称性破坏相互作用来介导的。观察到可交换羟基质子的受激发射NMR信号。不可交换的甲基或亚甲基质子也被超极化，这一发现为人们提供了分子机制的见解。SWAMP具有许多潜在的应用，从低场MRI到药物发现。