GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER - VII (NEW) EXAMINATION- WINTER 2018
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Subject Code: 2170508 Date: 29/11/2018Subject Name: Nano Technology
Time: 10:30 AM to 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Differentiate Wet and Dry Etching. 03
(b) Briefly elaborate the potential applications of nanodimensional materials 04 in security, life science and electronics.
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(c) Briefly compare between ‘Top-down’ and ‘Bottom-up’ approaches of 07 fabrication of nanomaterials. Give examples of reduced dimensionality system (1D, 2D and 3D confinements).Q.2 (a) Classify the vapor deposition techniques used in Nano-technology. 03
(b) Briefly explain with an example the synthesis of nanomaterials in 04 structured media.
(c) Discuss the differences between scanning electron microscopy (SEM) 07 and transmission electron microscopy (TEM).
OR
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(c) Describe spray pyrolysis method for synthesis of ceramic nanopowder. 07
Q.3 (a) Discuss application of Nano-oxide as protective coatings. 03
(b) Discuss chemicals used in Etching. 04
(c) Discuss Co-precipitation method for making Nano-particles. 07
OR
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Q.3 (a) Discuss steps of Nano-lithography. 03
(b) Discuss Fabrication of Nano-wires using Template fabrication. 04
(c) Discuss the effect of nanometer length on the physico-chemical 07 properties of materials such as diffusivity, solubility, elastic properties, melting point etc.
Q.4 (a) Discuss the principle of Atomic force Microscope 03
(b) State a few safety and storage considerations of nanomaterial. 04
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(c) Enlist the general methods of preparation of quantum dots of compounds 07 semiconductors. Illustrate any one in details.Q.4 (a) Discuss type of Micro Emulsion. 03
(b) What is quantum dot? Give examples and state its industrial uses. 04
(c) Explain the principle of X-ray Diffraction analysis. What kind of 07 information would you expect from the X-ray diffractogram.
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Q.5 (a) What is nanosensor? Discuss theory advantages over their micro-scale 03 and macro-scale counterparts.
(b) Discuss various application of Nano-technology in medical Science. 04
(c) Write a short note on any one (i) Grain Boundary engineering Or Zenner 07 Pinning (i1) Nanocatalysts
OR
Q.5 (a) State the laws of crystallography. What is a Miller index? 03
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(b) State if there is any disadvantage of using nanomaterials. 04(c) Explain vapor condensation method for production of nanoparticles 07
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