| Title | Self-organization in chemistry: 1. pH oscillations in a bromate-sulfite-perchloric acid system and 2. infiltration-acidization-deposition dynamics in a ferruginous limestone rock / by Farah Imadeddine El Zaknoun | Thesis |
| Name(s) | El Zaknoun, Farah Imadeddine (Main Author)
American University of Beirut. Faculty of Arts and Sciences. Department of Chemistry (Related name)
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| Publication | 2009
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| Link(s) | Click for full-text
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| Physical Details | xii, 98 leaves; ill. (some col.); 30 cm.
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| Subjects | Chemical reactions
Liesegang rings
Oscillations
Chemical kinetics
Chemistry
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| Classmarks | T:005304
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| Notes | Dissertation: Thesis (M.S.)--American University of Beirut, Dept. of Chemistry, 2009.
Dissertation: Advisor : Dr. Rabih Sultan, Professor, Chemistry
Member of Committee : Dr. Mazen Al-Ghoul, Associate Professor, Chemistry
Member of Committee : Dr. Houssam El-Rassy, Assistant Professor, Chemistry.
General: Appendix : leaves 92-93.
Bib. & Index: Bibliography : leaves 94-98.
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| Abstract | The thesis is divided into two parts, both related under the fascinating field of self- organization in Chemistry. These are: 1) oscillatory chemical reactions, in particular pH oscillations; and 2) simulation of geochemical patterns in natural rocks, to correlate a Liesegang mechanism within them.
Much of the interest in studying pH-oscillations is due to its various applications in drug-delivery and biochemical processes, in addition to its ability to unravel the mechanism of oxidation of sulfur compounds which constitute an important contribution in pH oscillatory systems. Our reaction system under study is the bromate- sulfite- perchloric acid system. This reaction system is known to exhibit periodic oscillations. Further investigation of the system was presented. The reaction was carried out in a continuous stirred tank reactor (CSTR). The amplitudes and frequencies of the oscillations were measured for a wide number of experimental conditions (concentrations), and a bifurcation diagram in the pH-[bromate] space was constructed. In addition, the flow rate was varied in an attempt to find the peculiar phenomenon of deterministic Chaos.
To complete our study, kinetic experiments were performed in a batch (closed) reactor, in an unbuffered medium and at zero ionic strength where the method of initial rates was applied for the determination of the orders in the three species comprising our system. And then the rate constant is calculated from the obtained rate law.
The second part of the thesis is a concise study of Geochemical Self-Organization, in which an attempt to associate the Liesegang banding phenomenon with rock patterns found in nature is made. Particularly, the simulation is done in situ on a porous ferruginous limestone rock wherein a sulfuric acid solution is infiltrated causing the dissolution of the calcite mineral (CaCO3), and the subsequent precipitation of gypsum or anhydrite (forms of CaSO4). Eight regions that simulate "Liesegang bands" after the infiltration was stopped were delineated and analyzed using powder XRD techniques.
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Category | | | Jafet Archives and Special Collections | Thesis | T:5304:c.1 | ASC-Binding | Building Use |
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