JNTU
JNTU B.Tech III SYNTHESIS OF NANOMATERIALS Previous Question Paper (December - 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
Beside the small sizes, list at least two characteristic that Nanoparticles should have.
Answer
Two key characteristics of nanoparticles are their high surface-to-volume ratio and quantum confinement effects, which significantly alter their physical and chemical properties compared to bulk materials.
List three general applications of Nanomaterials?
Answer
Three general applications of nanomaterials include: 1) Biomedical applications such as targeted drug delivery and bio-imaging; 2) Electronics for high-performance transistors and sensors; and 3) Energy sector applications like improved battery electrodes and solar cell efficiency.
What is Plasma CVD? Do you call it a physical method or a chemical method?
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Write the principle of sputtering process.
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Suggest a method of silver nanoparticle preparation by chemical reduction.
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When do you use precipitation and co-precipitation, respectively?
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What is bio-synthesis? Explain with suitable example.
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Suggest a method to synthesis carbon nanotubes by template assisted approach.
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How would you fix oxidant to fuel ratio in combustion synthesis? Discuss with an example.
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What is spray pyrolysis method for Nano synthesis?
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Part B
Suggest a method to prepare meta stable forms (for example, zeolites).
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What do you understand by bottom up approach?
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What do you understand by top down approach? Discuss the application of top down approach with a suitable example.
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What is planetary ball mill? How does it work?
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Discuss the theory of molecular beam epitaxy.
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What are the advantages of using thermal Vaporization to prepare carbon nanotubes?
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List the advantages and disadvantages of using ALD method to grow thin films.
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Name one major challenge in fabrication and processing of Nanomaterials by physical methods.
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How would you prepare quantum dots by electrochemical synthesis? What are the advantages of this approach over chemical reduction?
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What are the difference between precipitation and co-precipitation?
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Discuss the role of pH for the preparation of nanomaterials by colloidal synthesis.
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Discuss the synthesis of nanocrystals by arrested precipitation.
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Explain the role of bacteria in Nanoparticles synthesis.
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Explain the role of plants in green synthesis of nanoparticles.
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Explain the synthesis of Gold nanoparticles by using fungus.
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Explain natural synthesis of magnetic nanoparticles from magnetotatic bacteria.
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Discuss thermolysis route of nanosynthesis.
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Explain hydrothermal synthesis for producing nanomaterials.
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What is solution combustion synthesis? How would you control the particle size by this method?
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Suggest a method for the preparation of C and N-doped TiO2.
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