PG – 205

*PG205*

IV Semester M.Sc. Degree Examination, June 2016 (CBCS) CHEMISTRY C-403 : Chemistry of Materials (IC/AC) Time : 3 Hours

Max. Marks : 70

Instruction : Answer Question No. 1 and any five of the remaining. PART – A 1. Answer any ten of the following :

(2×10=20)

a) How do you prepare nanoscale material by sputtering process ? Give an example. b) Write the essential requisites of a material to exhibit the liquid crystalline behaviour. Give examples. c) Mention two reasons why there must be a strong band between fiber and matrix at their interface. d) Enumerate the factors influencing the quality of metallic ribbons prepared by melt spinning technique. e) Differentiate whiskers and fibers. Mention how they differ from wires. f) Mention any two limitations of solid material synthesis by ceramic method. g) What are soliton and polaron/bipolarons ? Write their structure with suitable examples. h) How do you prepare metal nanoparticles by chemical reduction method ? Give an example. i) Write schematics of any two modification strategies of carbon nanotubes. j) Write any two merits of solids synthesis by precursor method. k) “Molecular sieves are ideal size selective substrate materials in ionic removal”. – Justify the statement with examples. l) “Fullerides are good conducting materials than fullerenes” – Justify the statement.

P.T.O.

*PG205*

PG – 205

PART – B 2. a) Describe different substitutive mechanism of condensation of metal-oxygen linkages in sol-gel synthetic method. b) Explain the conducting mechanism in α -alumina.

(6+4=10)

3. a) Sketch any two functionalization strategies used in fullerene derivatization process. b) Discuss the synthesis of LaBa2Cu3O7.

(6+4=10)

4. a) Describe the graphite-arc evaporation method for the synthesis of carbon nanotubes. b) Depict the steps involved in the formation of self assembled monolayers of surfactant molecules. (6+4=10) 5. a) Describe any two methods of characterization of metal nanoparticles. b) Discuss the applications of functionalised carbon nanotubes.

(6+4=10)

6. a) Distinguish between dispersion strengthened and particle reinforced composites with suitable illustrations. b) Differentiate the salient features of classical model and Dumas-Herold model mechanisms of staging of graphite intercalation compounds. (5+5=10) 7. a) Classify the liquid crystals with suitable examples. b) Distinguish nematic phase A, B and sematic phase of liquid crystals with suitable illustrations. (3+7=10) 8. a) Discuss the magnetic and mechanical properties of amorphous metallic glasses. b) Describe the applications of liquid crystals as display systems with examples. (6+4=10) ———————