Observation of long-lived spin order in nanoconfined water
Abstract
Liquids confined to nanometer-scale geometries exhibit behavior that departs markedly from their bulk counterparts, yet studying their dynamics under controlled conditions remains experimentally challenging. Here, we use nitrogen-vacancy (NV) center nuclear magnetic resonance (NMR) spectroscopy to probe water confined in 5.6 nm channels as a function of temperature. The system remains liquid throughout the investigated temperature range and exhibits strongly suppressed diffusivity, enabling direct detection of its 1H NMR spectrum. Occasionally, the proton resonance transforms into a doublet with a splitting of several tens of kilohertz, which we tentatively attribute to hyperfine interactions mediated by long-lived paramagnetic charge complexes, in turn seeded by solvated electrons optically injected during laser illumination. The intermittent appearance of this feature suggests a metastable state comprising a correlated population of charge-hydration complexes extending throughout the confined liquid.
Cite
@article{arxiv.2607.28480,
title = {Observation of long-lived spin order in nanoconfined water},
author = {Rohma Khan and Kang Xu and Nathaniel Jeffries and Ankit Bhardwaj and Boya Radha and Daniela Pagliero and Carlos A. Meriles},
journal= {arXiv preprint arXiv:2607.28480},
year = {2026}
}