Publisher DOI: 10.1002/mrc.4742
Title: Imaging of copper oxygenation reactions in a bubble flow
Language: English
Authors: Benders, Stefan 
Strassl, Florian 
Fenger, Bastian 
Blümich, Bernhard 
Herres-Pawlis, Sonja 
Küppers, Markus 
Keywords: 1 H; bubble flow; chemical engineering; contrast agents; magnetic resonance imaging
Issue Date: Sep-2018
Source: Magnetic Resonance in Chemistry 9 (56): 826-830 (2018-09)
Abstract (english): 
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.
URI: http://hdl.handle.net/11420/8649
ISSN: 0749-1581
Journal: Magnetic resonance in chemistry 
Document Type: Article
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