Cc H192099 Pages:
Reg No.: Name:__ 300
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
EIGHTH SEMESTER B.TECH DEGREE EXAMINATION(S), OCTOBER 2019

Course Code: ME468
Course Name: NANOTECHNOLOGY
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three full questions, each carries 10 marks. Marks
1 a) What are different classifications of nanostructures? Give examples of each. (6)
b) Distinguish between nanoclusters and nanotubes. (4)
2 9) 115 the unique properties and applications of quantum dots. (6)
b) What is a quantum wire? List few practical examples. (4)
Explain how the electronic and optical properties of material at nano level. (10)
4 Explain with an example the variation in mechanical and chemical properties of (10)
material at nano scale.
PART B
Answer any three full questions, each carries 10 marks.
5 9) Explain the various CVD reaction types with suitable examples. (6)
b) What are the various steps involved in a typical CVD technique? (4)
6 a) With aneat sketch explain the process of ball milling for powder production. (6)
b) 1150 any two top down and bottom up method of nanofabrication with example. (4)
7 9) Explain with diagram the working of electron gun used in SEM? (6)
b) What are the various detectors used ina SEM? (4)
8 With a neat sketch explain the working of Raman Spectroscopy. (10)
PART C

Answer any four full questions, each carries 10 marks.
9 ച Write short note on covalent and non-covalent approaches followed in molecular (6)

machines.
b) What are the difficulties in developing molecular devices? (4)
10 ஐ Whatare the classifications of nano sensors? (6)
b) What are the physical properties used for sensing? (4)
11 ३) Explain three basic geometries of CNT. (6)
b) What are nanostructured coatings? (4)
12 ௨) Explain two step method of preparation of nanofluids. (6)

b) Explain how viscosity and specific heat of nanofluids vary compared to base fluids with (4)

suitable examples.

13 a) Explain different properties of CNT? What are its applications? (6)
b) What is nanocomposite? What are its applications? (4)
14 a) Explain the mechanism of enhanced thermal conductivity of nanofluids? (6)
b) What ೩೮ nanofilters? (4)

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