Lin, C. T. (Chhui-Tsu)
M.A. (Master of Arts)
Department of Chemistry and Biochemistry
Colloids--Optical properties; Colloids--Electric properties; Europium; Chromium ions
The sol-gel process provides an inexpensive way to experiment with compounds that otherwise prevent further study and exploration due to their pH dependence, inorganic and organic nature,, and temperature dependence. In this research, a combination of emission, absorption, thermogravimetry, and differential scanning calorimetry data has been combined with the chelation properties of organically modified ethylenediaminetetraacetic acid (EDTA). Along with EDTA, other chelating compounds were also tested, including an organically modified EDTA, HEDTA, and DTP A. Leaching results provide greater abilities with DTP A > HEDTA > EDTA > EDTAorganically modified. The sol-gel matrix was also proven to elicit various trends, including the ability to reduced Eu^3+ - Eu^2+. An experiment designed to reduce the dopant-leaching behavior exhibited among gel samples was aided by the one to one molar ratio of covalently bonded molecules. In addition, a study using cyclic voltammetry aided in the observation of oxidation-reduction intermediates of Cr^6+ - Cr^3+. This study also proved valuable information as to the electron-hole carriers within the gel matrix. In combining emission, absorption, and thermal data, the ability to entrap chemical intermediates and promote the detection of electron-hole carriers has been successfully accomplished. Both europium and-chromiiwri have been reduced, providing a more environmentally safe technique in the handling of toxic compounds.
Bailey, Linda S., "Optical and electrochemical properties of europium and chromium ions in the sol-gel matrix" (1999). Graduate Research Theses & Dissertations. 4203.
x, 107 pages
Northern Illinois University
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