JNTU
JNTU B.Tech III NANOTECHNOLOGY Previous Question Paper (January/February - 2023 - R16)
i) Question paper consists of Part A, Part B.
ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions.
iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Define Nanomaterial.
Answer
A nanomaterial is defined as any material having at least one external dimension in the nanoscale size range, typically between 1 and 100 nanometers. At this scale, materials exhibit unique physical, chemical, and biological properties—such as increased surface area-to-volume ratio, quantum effects, and enhanced reactivity—that differ significantly from those of the same material in bulk form.
List out few Nano structures.
Answer
Nanostructures are classified based on their dimensionality, representing the number of dimensions that are outside the nanometer range. Common examples include:
- Zero-dimensional (0D) structures: Nanoparticles, quantum dots, and nanoclusters, where all three dimensions are at the nanoscale.
- One-dimensional (1D) structures: Nanowires, nanotubes (such as carbon nanotubes), and nanorods, where two dimensions are at the nanoscale.
- Two-dimensional (2D) structures: Nanosheets, nanofilms, and graphene, where only one dimension is at the nanoscale.
- Three-dimensional (3D) structures: Nanostructured bulk materials, such as polycrystalline materials or dendrimers, which consist of a complex arrangement of nanoscale building blocks.
What are the micro structural features in nanomaterials?
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Classify Twins, stacking faults and voids.
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What are the advantages of Bottom up approaches?
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Explain about distinctive features of a self-assembled nanostructure.
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Explain the principle of TEM.
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List out different aspects of crystallite information that can be investigated using SEM.
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What are Conventional semiconductor devices?
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Classify about Molecular electronic devices.
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Part B
What are nanofluids? Explain in detail about the preparation of nanofuids with an example.
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Explain the applications of Nano-enabled biosensors in Environmental Monitoring.
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Create a note on Nature as “The Best Nano technologist” with suitable examples.
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List out the challenges and future prospects of Nanotechnology.
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Design a note on Optical properties of Nanocrystalline materials with suitable example.
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List out the major factors contributing to the difference in the mechanical behaviour of nanostructured materials.
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Identify the effects of nano-dimensions on materials behaviour with suitable examples.
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Define Giant Magneto Resistance (GMR). Discuss in detail about GMR effect in magnetic ultrathin films with a schematic diagram.
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Explain with neat diagram Chemical Vapour Deposition (CVD) process.
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Distinguish in detail between hot wall and cold wall CVD with a schematic diagram.
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Explain the principle and instrumentation of Molecular Beam Epitaxy with a schematic diagram.
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Explain synthesis of nanomaterials by Laser ablation with a schematic diagram.
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Discuss in detail about principle and Modes of operation of the STM with a schematic diagram.
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Explain the principle and working of SAXS.
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Explain in detail about working and basic components of TEM with a schematic diagram.
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Interpret about Quantitative analysis using TEM with a suitable example.
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Identify in detail about Main challenges for nanoagriculture.
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List out challenges for food processing and production and the corresponding risk issues.
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Design a note on nanomaterials which can be used to deliver nutrients and their potential applications.
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Discuss in detail about multipurpose applications for smart textiles.
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