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In the Laboratory
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Viscosity by Fluorescence Depolarization of Probe Molecules. A Physical Chemistry Laboratory Experiment
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Charles F. Windisch, Jr.
Department of Chemistry, Washington State University Tri-Cities, Richland, WA 99354
Gregory J. Exarhos
Pacific Northwest National Laboratory, Richland, WA 99352
Shiv K. Sharma
Hawai'i Institue of Geophysics and Planetology, University of Hawai'i, Honolulu, HI 96822
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June 2005
Vol. 82 No. 6
p. 916
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| Abstract |
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This two-session undergraduate laboratory experiment in physical chemistry involves the measurement of the viscosity of solutions using both a conventional method and a new method based on the fluorescence depolarization of a probe molecule. By comparing the results of the two approaches, students will come to a fundamental understanding of how a macroscopic property (viscosity) and molecular-level properties (molecular dynamics parameters) relate. They will also further their understanding of the physical chemistry of fluorescence and learn how to perform spectroscopic measurements where polarization conditions are important. The experiment also has ramifications in the practical world, because the optical approach has shown promise as the basis for a sensor for in situ viscosity measurement.
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| Supplement |
Instructions for the students and notes for the instructor, including discussion questions and answers, are available.
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| More Information |
Citation |
Windisch, Charles F., Jr.; Exarhos, Gregory J.; Sharma, Shiv K. J. Chem. Educ. 2005 82 916.
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Keywords |
Analytical Chemistry; Applications of Chemistry; Dyes / Pigments; Fluorescence Spectroscopy; Hands-On Learning / Manipulatives; Instrumental Methods; Laboratory Instruction; Liquids; Molecular Mechanics / Dynamics; Physical Chemistry; Physical Properties; Solutions / Solvents; Upper-Division Undergraduate
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History |
Created:
Last Updated: |
April 27, 2005
May 11, 2005
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916
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