title: Natural abundant (17) O NMR in a 1.5-T Halbach magnet.
abstract: We present mobile, low-field (17) O NMR as a means for monitoring oxygen in liquids. Whereas oxygen is one of the most important elements, oxygen NMR is limited by a poor sensitivity related to low natural abundance and gyro-magnetic ratio of the NMR active (17) O isotope. Here, we demonstrate (17) O NMR detection at a Larmor frequency of 8.74 MHz in a 1.5-T Halbach neodymium magnet with a home-built digital NMR instrument suitable for large-scale production and in-line monitoring applications. The proposed (17) O NMR sensor may be applied for direct, noninvasive measurements of water content in, for example, oil, manure, or food in automated quality or process control. Copyright © 2015 John Wiley & Sons, Ltd.
authors: Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO), and Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, Aarhus C, DK-8000, Denmark.
authors: Morten K
authors: MK
authors: Sørensen
authors: Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO), and Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, Aarhus C, DK-8000, Denmark.
authors: Oleg N
authors: ON
authors: Bakharev
authors: NanoNord A/S, Skjernvej 4A, Aalborgø, DK-9220, Denmark.
authors: Ole
authors: O
authors: Jensen
authors: Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO), and Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, Aarhus C, DK-8000, Denmark.
authors: Niels Chr
authors: NC
authors: Nielsen
mesh_terms: D000096:Acetone / Q000032:analysis; D004574:Electromagnetic Fields; D055590:Electromagnetic Phenomena; D004867:Equipment Design; D000431:Ethanol / Q000032:analysis; D005504:Food Analysis; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation*; D059346:Magnets; D009354:Neodymium; D010103:Oxygen Isotopes; D014867:Water / Q000032:analysis; D018508:Water Purification
chemical_list: D010103:Oxygen Isotopes; D014867:Water; D000096:Acetone; D009354:Neodymium; D000431:Ethanol
keywords: 17O; NMR; mobile NMR; permanent magnet