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1999
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February
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In the Laboratory
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Determination of Surface Coverage of an Adsorbate on Silica Using FTIR Spectroscopy
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Jeanne E. Pemberton, Laurie L. Wood, and Ghanshyam S. Ghoman
University of Arizona, Department of Chemistry, Tucson, AZ 85721
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February 1999
Vol. 76 No. 2
p. 253
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| Abstract |
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A laboratory exercise in which quantitative FTIR spectroscopy is used to determine the surface coverage of an adsorbate, bromobenzene, on silica surfaces is presented. It has three parts: (i) determination of the path length of a liquid IR cell from the interference pattern observed spectrally, (ii) determination of the absorptivity of one or more bromobenzene bands using Beer's law, and (iii) determination of the surface coverage of bromobenzene on high-surface-area powdered silica in a transmission FTIR experiment using the absorptivity values determined in this experiment. The experiment can be completed in a single 4-hour laboratory period; a shorter variant is also described. Successful implementation of the experiment in an advanced undergraduate instrumental analysis course has demonstrated the sensitivity of this approach to surface coverages of bromobenzene on silica on the order of 10-11 mol/cm2. This single experiment exposes students to several topics not typically covered in depth at the undergraduate level: an introduction to surfaces, surface chemistry, and surface analysis, and the use of FTIR for quantitative analysis. Thus, it could be effectively used at the undergraduate level in instrumental analysis, physical chemistry, or materials chemistry laboratories.
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| More Information |
 Citation |
Pemberton, Jeanne E.; Wood, Laurie L.; Ghoman, Ghanshyam S. J. Chem. Educ. 1999 76 253.
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Keywords |
Laboratory Equipment / Apparatus; Surface Science; Analytical Chemistry; Laboratory Instruction
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History |
Created:
Last Updated: |
June 15, 1999
June 22, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
1999
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February
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253
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