What are triboelectric nanogenerators? Explain the different modes of their operation.
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Explain the steps of sol-gel synthesis of silica gel. Differentiate between the structure and method of formation of xerogel and aerogel.
What is meant by bio-template? With an example explain how it can be used in nanostructure synthesis. State the advantages of using green methods for nanomaterial synthesis.
What is the difference between single domain and superparamagnetic particles? A superparamagnetic material has a characteristic time of 10-11 seconds and a Néel relaxation time of 2.0 second at 300 K.
Calculate
i) the energy barrier (in eV); and
ii) the blocking temperature if the measurement time is 120s.
Take .
Explain the lotus effect based on contact angle. Describe two practical applications of lotus effect.
Explain the construction and working principle of a microfluidic cantilever sensor. What is the resolution attained by such sensor?
Describe the detection mechanism of a virus with the use of Up-Conversion Nanoparticles (UCNPs).
Describe the property of band inversion in a topological insulator. Hence explain why a topological insulator cannot be transformed into a normal insulator.