NDLI: Characterization of a new system for space-resolved simultaneous in situ measurements of hydrocarbons and dissolved oxygen in microchannels

Content Provider	Springer Nature Link
Author	Fräulin, Christine Rinke, Günter Dittmeyer, Roland
Copyright Year	2013
Abstract	A space-resolved in situ measurement technique based on laser Raman spectroscopy with high detection sensitivity is described. This method allows the simultaneous detection of the concentrations of dissolved molecular oxygen and of hydrocarbons as well as oxidation products in organic liquids in a microchannel during reaction. It can be used as a new tool for detailed kinetic studies of liquid-phase reaction. Raman spectra are produced using an argon ion laser at 488 nm with a continuous optical power of 100 mW. This radiation is coupled into a microscope and a microchannel. The arising Raman stray light is detected with a spectrometer and a sensitive CCD camera. Special optics were used to collect as much light as possible on the CCD detector. This results in high signals and low noise levels. In order to demonstrate the usefulness of the system, cyclohexane oxidation by oxygen was investigated. In a feasibility study for the products of the cyclohexane oxidation, a limit of detection of 0.05 % m/m for cyclohexanol and 0.01 % m/m for cyclohexanone was achieved. Molecular oxygen dissolved in cyclohexane could be detected at the relevant concentration ranges for carrying out the oxidation of cyclohexane with a limit of detection of 0.01 % m/m. An optically transparent microchannel reactor was built, which can be used up to temperatures of 503 K and pressures of 8 MPa. With this reactor and the in situ measurement technique, space-resolved studies with a measuring volume of 5 μm × 5 μm × 38 μm can now be realized. The spectral selectivity and sensitivity of the measurement technique applied to cyclohexane oxidation, and the characteristics of the spatially resolved measurement technique are discussed.
Starting Page	149
Ending Page	157
Page Count	9
File Format	PDF
ISSN	16134982
Journal	Microfluidics and Nanofluidics
Volume Number	16
Issue Number	1-2
e-ISSN	16134990
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-07-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Raman spectroscopy Microchannel reactor Cyclohexane oxidation In situ analytics Space-resolved measurements Sensitivity Engineering Fluid Dynamics Biomedical Engineering Analytical Chemistry Nanotechnology and Microengineering
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Materials Chemistry Condensed Matter Physics Electronic, Optical and Magnetic Materials

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