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  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > December  >
In the Laboratory
Photoelectrochromism in Tungsten Trioxide Colloidal Solutions
C. R. Chenthamarakshan, N. R. de Tacconi, Lucy Xu, and Krishnan Rajeshwar
Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019-0065
Cover
December 2004
Vol. 81 No. 12
p. 1790
Abstract
This article describes a simple laboratory experiment in which students observe the color changes undergone by tungsten trioxide (WO3) colloids subjected to UV irradiation. This experiment begins with the preparation of the colloidal solutions. The changes induced in their UV–visible absorption profiles by organic additives such as sodium oxalate are then examined. The experiment can be used to teach concepts in materials chemistry, photoelectrochemistry, electron-transfer processes, quantum mechanics, colloid chemistry, or chemical instrumentation depending on the instructor's emphasis.
Supplement
Instructions for the students and notes for the instructor are available.
*  Contents JCE2004p1790W.doc (Microsoft Word)
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*  Citation
 Chenthamarakshan, C. R.; de Tacconi, N. R.; Xu, Lucy; Rajeshwar, Krishnan. J. Chem. Educ. 2004 81 1790.
*  Keywords
 Analytical Chemistry; Electron Transport; Instrumental Methods; Laboratory Instruction; Materials Science; Physical Chemistry; Redox Reactions; Solid-State Chemistry; UV–Vis Spectroscopy
*  History
 Created:
Last Updated:		 November 1, 2004
November 9, 2004
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