University of North Florida
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Contact Info

Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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J. Georges

Abbrev:
Georges, J.
Other Names:
Address:
Laboratoire des Sciences Analytiques, Université Claude Bernard-Lyon 1, 43 Boulevard du 11 Novembre 1918, Bâtiment CPE-308D, 69622, Villeurbanne Cedex, France
Phone:
NA
Fax:
+33-472-431-078

Citations 3

"Photothermal Spectrometry For Detection In Miniaturized Systems: Relevant Features, Strategies And Recent Applications"
Spectrochim. Acta A 2004 Volume 60, Issue 12 Pages 2793-2801
K. Abbas Ghaleb and J. Georges

Abstract: There is a growing interest in using miniaturized analytical devices because they allow to execute the different steps of an analytical process within very short times and with drastic reduction in the amounts of solvents, reagents and samples. As for capillary electrophoresis, these systems require detectors which are sensitive, versatile and adaptable to very small detection volumes. In this respect, photothermal spectrometry which is complementary to fluorescence seems to be a promising detection method. This review describes the basic principle of photothermal spectrometry along with the related methods based on colinear-beam or crossed-beam configuration of the pump and probe lasers. Two experimental set ups especially designed for microfluidic systems as well as for capillary electrophoresis are described. Their characteristics and key features are discussed and the main applications are outlined.

"Molecular Spectroscopic Methods For The Determination Of Lanthanides In Solutions"
Spectrochim. Acta Rev. 1991 Volume 14, Issue 5 Pages 337-351
Georges, Joseph

Abstract: A review with 155 references. This paper presents the spectral properties of lanthanide ions and chelates and reviews the deriving mol. spectrometric methods involved in the anal. of lanthanides. These include conventional or laser-based absorption and emission methods, such as UV-visible absorption spectrometry, thermal lens spectrometry, photoacoustic spectrometry, spectrofluorometry and laser-induced fluorescence. (SFS)
Metals, lanthanides Spectrophotometry Review

"Investigation Of The Mixing Efficiency Of A Chaotic Micromixer Using Thermal Lens Spectrometry"
Appl. Spectrosc. 2006 Volume 60, Issue 5 Pages 564-567
Ghaleb, Khalil Abbas1; Stephan, Khaled2; Pittet, Patrick2; Ferrigno, Rosaria2; Georges, Joseph1

Abstract: This work investigates the efficiency of a chaotic micromixer using thermal lens spectrometry. The outlet of the mixing device was connected to a thermal lens detection head integrating the probe beam optical fibers and the sample capillary. The chaotic micromixer consisted of a Y-shaped poly(dimethylsiloxane) (PDMS) microchip in which ribbed herringbone microstructures were etched on the floor of the main channel. Due to the solvent composition dependence of the thermal lens response, the photothermal method was shown to be highly sensitive to nonhomogeneous mixing compared to fluorescence detection. The apparatus was applied to the determination of Fe2+ with 1,10-phenanthroline using flow injection analysis; a limit of detection of 11 ?g L-1 of iron was obtained. © 2006 Society for Applied Spectroscopy.