Journal
MAGNETIC RESONANCE IMAGING
Volume 56, Issue -, Pages 37-44Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.mri.2018.09.026
Keywords
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Funding
- U.S. National Science Foundation [CBET-1512228, CBET-1604095]
- UC Santa Barbara's Mellichamp Academic Initiative in Sustainability
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences
- U.S. DOE [DE-AC02-07CH11358]
- PNNL Laboratory Directed Research and Development program [67228, 68503]
- Office of Biological and Environmental Research
- DOE [DE-AC05-76RL01830]
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A new MAS-NMR rotor (the WHiMS rotor) has been developed which can reach pressures of 400 bar at 20 degrees C or 225 bar at 250 degrees C. These rotors are ideal for mixed phase systems such as a reaction using a solid catalyst with a liquid/supercritical solvent topped with high pressure gas in the head space. After solid and liquid portions of the sample are loaded, the rotor is capped with an o-ring equipped polymer bushing that snaps into a mating groove in the rotor. The bushings incorporate a check valve into the sealing mechanism which allows for pressurization without mechanical manipulation - they will allow gas to flow in but not out. This WHiMS rotor design has enabled experiments on a wide variety of biotic and abiotic mixed-phase systems. Geochcmical systems have also been studied, for example, adsorption and confinement studies of supercritical methane/CO2 in clays and other minerals which display pressure dependent C-13 chemical shifts. Example data from other mixed-phase chemical and microbial systems are reported. These include monitoring metabolite conversion of extremophilic bacteria found in subsurface systems at elevated pressures and real-time operando reactions in catalysis systems - with liquid-quality resolution for H-1 and C-13 NMR spectra.
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