Publication Date

1999

Document Type

Dissertation/Thesis

First Advisor

Lin, C. T. (Chhui-Tsu)

Degree Name

M.A. (Master of Arts)

Department

Department of Chemistry and Biochemistry

LCSH

Colloids--Optical properties||Colloids--Electric properties||Europium||Chromium ions

Abstract

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.

Comments

Includes bibliographical references (pages [106]-107).

Extent

x, 107 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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