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Imaging of copper oxygenation reactions in a bubble flow
Author(s) -
Benders Stefan,
Strassl Florian,
Fenger Bastian,
Blümich Bernhard,
HerresPawlis Sonja,
Küppers Markus
Publication year - 2018
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4742
Subject(s) - chemistry , bubble , copper , diamagnetism , paramagnetism , viscosity , oxygen , chemical physics , nuclear magnetic resonance , analytical chemistry (journal) , magnetic field , thermodynamics , mechanics , chromatography , organic chemistry , physics , quantum mechanics
Reactions of gases with liquids play a crucial role in the production of many bulk chemicals. Often, the gas is bubbled into the chosen reactor. Most of the processes at the gas–liquid interface of the bubbles and in their tails are not fully understood and warrant further investigation. For this purpose, NMR imaging or Magnetic Resonance Imaging has been applied to visualize some of the processes in the bubble tail. To generate sufficient contrast, a magnetogenic gas–liquid reaction associated with a change of magnetic state, from diamagnetic to paramagnetic, was employed. In this work, a copper(I)‐based compound was oxidized to copper(II) to exploit relaxation contrast. To match the speed of the rising bubbles to the acquisition time of the spin‐echo imaging sequence, polyethylene glycol was added to increase the viscosity of the reacting solution. Images of the oxygen ingress into a static solution as well as of oxygen bubbles rising in the solution are presented. In both cases, changes in magnetism were observed, which reported the hydrodynamic processes.