Description
M.Sc. (Physics) Programme
(MSCPH)
Valid from 1st January, 2025 to 31th December, 2025Tutor Marked Assignment
NANOSCIENCE
Course Code: MPHE-027
Assignment Code: MPHE-027/TMA/2025
Max. Marks: 100
Note: Attempt all questions. The marks for each question are indicated against it.
PART A
1. a) Explain the use of nanotechnology in the Prehistoric and Ancient Era.
b) Outline the role of developments in quantum mechanics and microscopy
techniques in understanding the nanostructures.
2. a) Calculate the surface energy for a copper crystal for (110) plane. Copper has FCC
structure with atomic radius 1.28 Å. The heat of vaporization is 341 kJ mol-1.
(5)
(5)
(5)
b) Describe the phenomenon of Ostwald Ripening based on the solute concentration given
by Thompson-Freundlich relation.
(5)
3. a) Explain the principle used in sonochemical method of synthesizing nanoparticles. (5)
b) Which chemical components in the plant extracts make them active for metal
nanoparticle synthesis? What is the difference between the static and dynamic self
assemblies?
4. a) Draw a labeled schematic diagram of the system used to synthesize Fullerenes.
How was the presence of cage molecules of carbon first discovered?
b) Given for a single wall carbon nanotube that rolls on, chiral vector is r = na1 + ma2,
Find out the chiral angle and diameter of CNT with (n, m) = (5,5).
5. a) Describe the features of Type II semiconductor@semiconductor core-shell
particles with the help of band diagram. How can longer wavelength optical tuning
be achieved in Type II particles?
b) Explain the origin of two absorption peaks in the absorption spectra in the visible
range for nanorod structures of metals like gold.
PART B
6. a) Derive the expression for the quantum conductance of a nanowire connected to
two reservoirs of electrons with chemical potentials μ1 and μ2 with μ1 > μ2.
b) Describe the variation of Hall resistance xy
and longitudinal resistance xx
with
magnetic field in integer quantum Hall effect and fractional quantum Hall effect.
Can these phenomena be explained using free electron theory?
7. a) Explain Neel relaxation time and blocking temperature for a superparamagnetic
particle. How does the blocking temperature change with the size of the particle?
(1+4)
(3+2)
(5)
(4+1)
(5)
(5)
(5)
(4)
3
(4)
b) Draw a typical hysteresis loop for a superparamagnetic material and state its
characteristics.
c) How does the structure of a multilayer system exhibiting GMR differ from that
exhibiting TMR?
8. a) How can the blue colour of a morpho butterfly be explained using the concept of a
photonic crystal?
b) What is a photonic band gap? How is it different from an electronic band gap?
c) What is a topological insulator? Explain how a thin film of Bi2Se(Te)3 is
transformed into a topological insulator.
9. a) What are nanocomposites? Describe the applications of nanoparticle reinforced
ceramic nanocomposites.
b) Describe the use of nanotechnology in improving the masks used by health
workers. .
10. a) Explain the use of nanotechnology in targeted drug delivery. What are its
advantages?
b) Describe the mechanism of photocatalytic degradation of toxic pollutants like
Volatile Organic Compounds (VOCs) using nanomaterials like fullerenes and
CNTs.
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