AssignmentForModuleI
Lecture2&3Precursormethods
1. Discuss Wagner mechanism of diffusion. 2. Why precursor method is effective compared to solid state method 3. Why hydrazine carboxylate precursors are the best among those which yield fine particle oxides? 4. Why Alq3 molecular is a suitable precursor for Aluminum based oxides. 5. List three advantages for solid solution precursors over solid state method. 6. Predict the thermo‐gravimetric curve for the oxidation of CoFe2 to CoFe2O4. Lecture4&5Sonochemicalsynthesis
1. For synthesis nanomaterials what is the optimal parameters for sono chemical synthesis? 2. While synthesizing nanomaterials using sono chemistry, what is the most preferred starting material? 3. What is the crucial difference in sono chemical apparatus in synthesis of inorganic and organic materials? 4. What is the solid solution precursor? Compare the advantage with respect to nitrate, oxalate, and carbonate precursor for inorganic synthesis? 5. If I were to prepare chromium doped Al2O3, what is most preferred chemical route? 6. Describe the convenient method for YBCO super conductors? 7. In order to make a 2 inch target source for PLD process, what is the preferable method> 8. Hydroxy quinoline is a very good chelating agent; can we use it for inorganic or organic synthesis? 9. Define the cavitation phenomena in sono chemical process? 10. How does the purging gas influence the synthesis in sono chemical method (remember heat capacity values) Lecture6‐Combustionsynthesis
1. Define O/F ratio critical for combustion synthesis of metal oxide. 2. To synthesis LaMnO3 oxide what sort of starting do I employ for combustion synthesis? 3. How does wet combustion group differ from solid state combustion group? Explain with example. 4. Describe Thermal run away process in Microwave combustion route. 5. List five reasons why non ‐ conventional wet chemical routes are important over conventional chemical methods? 6. If I want to prepare a catalyst such as CuCr2O4 in nano form with very high surface area. Describe three possible routes and the most preferable among them. Lecture7‐MicrowaveSynthesis:
1 Compare the difference between regular microwave synthesis & microwave polyol synthesis. 2 Microwave synthesis is faster for few organic reactions why it is slow for others? Explain using mechanistic approach? 3 Microwaves are transparent for few materials. Why it is opaque for other materials? 4 Define Microwave polyol method & illustrate with the example. How does it differ from conventional polyol methods? 5 What is the advantage of solid state method to prepare high temp oxides? 6 What is the diffusion control solid state synthesis? Define the process using the reaction between MgO & Al2O3. 7 List the starting materials for the synthesis LaSrMnO3 Oxides via solid state methods. List all possibilities. 8 What is unique feature of Sol‐Gel route compare to other processing technique despite being a expensive method? 9 In a synthesis involving low temp route which will be the most preferred synthesis & what are the binding parameters? 10 To synthesis zinc chalcogenides which is the most preferred method? List the advantages. Lecture8‐Hydrothermalsynthesis
1. What are the additives needed for hydrothermal synthesis of Inorganic materials? 2. What are the crucial parameters for hydrothermal synthesis of Ferromagnetic CrO2? 3. Perovskite oxides are widely studied compared to spinal oxides. Why? 4. To prepare Zinc Oxide as : a. Powder (b) Thin Film (c) Nanowire (d) Crystals i. Suggest one best prefer method for each of the above. Lecture9ConventionalSolidStateChemistry
1. Why conventional solid state technique is still the most preferred technique? 2. Detail a method to prepare LaCrO3, CoCr2O4, La2CuO4 and YBa2Cu3O7 compounds. 3. What is the crucial disadvantage in solid state synthesis? 4. Which characterization tool you would employ to check chemical homogeneity and how will you evaluate?