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Study of Mechanism of Formation of Metal Oxide Nanoparticles in Supercritical Water Medium

Akhlaghpasand, Hamze | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45038 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Outokesh, Mohammad; Ahmadi, Javad
  7. Abstract:
  8. One of the most convenient methods for the synthesis of metal oxide nanoparticles, inorganic ceramic materials and catalysts is supercritical hydrothermal method. In its pure form or mixed metal oxide nanoparticles have potential applications are wide. An important aspect of functional metal oxides of uranium dioxide as the selective catalyst for the conversion of methane to methanol and chlorinated organic matter decomposition is used. The main issue that led to the definition of this project was that nanoparticles synthesized with supercritical hydrothermal conditions influenced by change in the temperature. Temperature also affects the particle size and the conversion efficiency. This requires knowledge of the effects of temperature and complete and accurate thermal reactor modeling. Because the reactors are made for the size and dimensions of this model with different reactors were used in the synthesis of nanoparticles, relations must be extracted in a way that is not dependent on the geometry. The modeling results were obtained in terms of synthesis reactors and the topics of nucleation and growth were studied.What do you study ahead briefly as follows. The first chapter begins with the definitions and hydrothermal processes and supercritical fluids and methods that have been used for the production of nanoparticles are reviewed. In the second chapter the heat transfer studies in this field and modelings that are done have been described. In the third chapter various theories of nucleation and the growth phenomenon will reviews and With the results obtained from the analysis of the models we can calculate the amount of nucleation in this condition. Finally, the conclusion of both topics, we express the final results
  9. Keywords:
  10. Nanoparticles ; Supercritical Water ; Heat Transfer Modeling ; Nucleation Rate ; Hydrothermal Method

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