JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III SYNTHESIS OF NANOMATERIALS Previous Question Paper (April - 2018 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
PART - A
Define ‘sol-gel’ and ‘emulsion’ synthesis methods.
Answer
Sol-gel is a wet-chemical technique where a colloidal suspension (sol) transitions into a continuous liquid-filled solid network (gel) through hydrolysis and polycondensation. Emulsion synthesis involves creating nanostructures within droplets of one liquid dispersed in an immiscible continuous phase, often using surfactants to stabilize the nanoreactors.
Distinguish top down and bottom up methods with examples.
Answer
Top-down methods involve breaking down bulk materials into nanosized structures (e.g., ball milling, lithography), whereas bottom-up methods build nanomaterials atom-by-atom or molecule-by-molecule (e.g., chemical vapor deposition, sol-gel synthesis).
Define lithography? Write its significance.
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Is Molecular Beam Epitaxy (MBE) falls under physical methods? Give few examples.
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What is Chemical reduction method?
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What is the main principle involved in co-precipitation method? Explain.
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What is Solvated metal atom dispersion?
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Write briefly about Template based synthesis of nanomaterials.
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What do you mean by Chemical vapour deposition (CVD) method?
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Write pros and cons of combustion flame spraying process.
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PART - B
Explain briefly Sol-gel method with proper mechanism/reactions.
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Why self-assembly is important in case of nanomaterials? Can you give any realistic example in nature that mimics the self-assembly.
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Discuss in detail the ball milling approach with examples.
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Discuss the main principle involved in Molecular beam epitaxy (MBE).
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Differentiate Physical and Chemical Vapor Deposition techniques in detail.
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Explain the process of Physical Vapour Deposition with a neat diagram.
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Explain the electrodeposition technique of synthesizing nanoparticles briefly.
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What is pulsed laser deposition? Explain briefly.
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Write in detailed note on MOCVD Metal Organic Chemical Vapor Deposition and CCVD Combustion Chemical Vapor Deposition (CVD).
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With a neat sketch explain the process of synthesis of nanomaterials via sonochemical routes.
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What do you mean by co-precipitation method? Discuss the method with few examples.
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Explain the process of Solvated metal atom dispersion with a neat sketch.
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With a neat sketch explain the synthesis of nanoparticle via any Biological method of your choice.
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Explain in detail the solution combustion route of nanoparticle synthesis.
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How nanoparticles will be synthesized by Thermolysis route? Explain with a neat sketch.
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